All-ceramic tooth and method for forming same

Abstract

This invention discloses an all-ceramic crown, comprising a supporting framework and a crown formed on the surface of the supporting framework. The supporting framework includes a first glass-ceramic body and a second glass-ceramic body. The first glass-ceramic body has a structural hardness greater than that of the second glass-ceramic body. A flattened resin reinforcement is formed between the first and second glass-ceramic bodies, and a fiber reinforcement layer is placed between the resin reinforcement and the second glass-ceramic body. This invention also discloses a method for forming the all-ceramic crown. This method involves first obtaining the corresponding first and second glass-ceramic bodies, then attaching reinforcing fibers to the concave side of the second glass-ceramic body, injecting the corresponding resin material, embedding the first glass-ceramic body, and forming the crown. The all-ceramic crown obtained using this invention exhibits good integrity, structural stability, and high strength; it also demonstrates good biocompatibility, natural color, and superior aesthetics.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of denture processing, in particular to a full-porcelain tooth and a forming method thereof. BACKGROUND

[0002] As the most commonly used dental restoration means, the porcelain tooth is obtained by grinding the tooth, taking an impression, pouring a plaster model, then making a metal base on the model, and then using porcelain powder to form a tooth crown on the metal base by high-temperature baking to obtain a usable porcelain tooth. When used, the restoration is attached to the ground tooth through the adhesive on the metal base side to repair the morphology and function of the damaged tooth body. However, the porcelain tooth has the following defects:

[0003] 1. The internal transparency of the metal base is poor, which easily affects the texture of the porcelain tooth, and easily shows a black line (i.e. the edge part of the metal base) at the tooth neck, making the porcelain tooth have an obvious false feeling after assembly; in addition, the metal base is easily oxidized in the oral cavity after being used for a period of time, forming gray oxides that are scattered and deposited to the gum edge, causing the gum edge to turn gray and affecting the overall appearance;

[0004] 2. The bonding performance between the metal base and the porcelain material of the tooth crown part has defects, and after being used for a period of time, the structure is easily peeled off, exposing the metal base, which leads to the collapse and failure of the porcelain tooth;

[0005] 3. The metal base usually contains beryllium elements, which can cause allergic reactions and other adverse reactions in some sensitive people during use, easily causing local gum swelling, bleeding, and even blackening;

[0006] 4. The metal base can also produce electromagnetic effects, which can easily affect the X-ray, CT and nuclear magnetic resonance examination of the head and face, causing adverse effects. Many hospitals require the removal of metal tooth crowns in the mouth during nuclear magnetic resonance examination, otherwise they will not be examined.

[0007] The full-porcelain tooth is a new type of denture restoration, which has a similar overall structure to the porcelain tooth, and only replaces the metal base with a layer of full-porcelain support framework. This restoration structure can effectively solve the defects in the use of the above-mentioned porcelain tooth, and has excellent color and texture, making the entire restored tooth body infinitely close to the texture of natural teeth, and gaining more and more recognition from doctors and patients.

[0008] The full porcelain teeth in the prior art mainly have two kinds of materials, namely zirconia ceramic and glass ceramic, but both of them have their own limitations. The zirconia ceramic has high strength, good stability and wear resistance, but poor transparency, and the full zirconia tooth after forming has dull color and poor modification effect, which is difficult to meet the high-quality repair requirements. The glass ceramic has a texture and color close to human real teeth after blending, has a realistic aesthetic effect and good biocompatibility, but has the defect of low overall structural strength, and the bonding strength defects are easily generated between the support skeleton and the abutment and between the support skeleton and the tooth crown, and the local loosening, internal cracking and even collapse are easily caused when the high-hardness food such as sugarcane, bone and ice block is bitten.

[0009] There are also some full porcelain teeth with composite structure on the market. The composite structure full porcelain tooth uses zirconia ceramic as a support skeleton on the surface of the abutment to improve the bonding strength with the abutment, and uses glass ceramic for porcelain decoration / enameling on the surface of the support skeleton formed by zirconia ceramic to improve the brightness and transparency of the tooth crown, so as to balance the aesthetics and practicability. However, this kind of composite structure full porcelain tooth has high requirements for the doctor's technology, material and manufacturing process. Specifically, due to the three crystal state characteristics of zirconia ceramic under normal pressure, it is difficult to control the amount of porcelain powder and the shrinkage ratio when the support skeleton is formed by zirconia ceramic, so it is difficult to obtain good fit between the support skeleton formed by zirconia ceramic and the abutment, and the abutment needs to be polished several times to adjust the bonding space size or the amount of bonding agent is directly increased, which leads to complex operation process. And under unfavorable operation conditions, strength defects are still easily generated between the support skeleton and the porcelain decoration, which causes the porcelain collapse phenomenon of the full porcelain tooth in the patient's mouth frequently, causing loss and trouble to the patient and clinic. SUMMARY

[0010] The technical problem solved by the present application is to provide a full porcelain tooth and a forming method thereof, which can be used to solve the defects in the above technical background.

[0011] The technical problem solved by the present application is solved by the following technical solution:

[0012] A full porcelain tooth, comprising a support skeleton and a tooth crown formed on the surface of the support skeleton;

[0013] The support skeleton is a composite structure, comprising a first glass ceramic body formed on the inner side and a second glass ceramic body formed on the outer side. The first glass ceramic body and the second glass ceramic body are both lithium disilicate glass ceramic bodies obtained by forming a lithium disilicate glass raw material and heat treatment, and the first glass ceramic body has a higher structural hardness than the second glass ceramic body.

[0014] The first glass ceramic body has a concave profile cavity matching the abutment surface on the abutment side, and the full-ceramic tooth is fixed to the abutment surface by a bonding fixation process at the position of the concave profile cavity;

[0015] The second glass ceramic body is wrapped on the outer surface of the first glass ceramic body;

[0016] A flat resin reinforcement is formed between the first glass ceramic body and the second glass ceramic body, and a fiber reinforcement layer is interposed between the resin reinforcement and the second glass ceramic body;

[0017] The resin reinforcement is Charisma PPF composite resin or self-made reinforced resin; the self-made reinforced resin has methyl methacrylate as a matrix, and uniformly dispersed therein are nano-quartz particles with a content of 2.5-3.5wt% and alkali-free glass fibers treated by surface treatment of epoxy silane with a content of 0.8-1.5wt%.

[0018] As a further limitation, the second glass ceramic body comprises the following raw material components by mass fraction: 70-80 parts of SiO2; 30-35 parts of Li2O; 3-5 parts of K2O, 1.5-3.0 parts of P2O5; wherein Li2O is introduced in the form of Li2CO3 after mass conversion; K2O is introduced in the form of K2CO3 after mass conversion;

[0019] In addition to the above-mentioned raw materials by mass fraction, the first glass ceramic body further comprises 2-3 parts of Al2O3 and 3.5-4.0wt% of ZrO2 based on the total mass of the raw materials of the first glass ceramic body, and the ZrO2 comprises 2-3wt% of Y2O3 as a stabilizer based on the mass of ZrO2;

[0020] The raw material processing method of the first glass ceramic body and the second glass ceramic body is as follows:

[0021] S1 first weighs the above-mentioned raw materials according to the mass ratio, adds them into a ball mill tank, and performs ball milling treatment using anhydrous ethanol, and then dries the mixture;

[0022] S2 performs two-stage melting of the dried mixture, and first maintains the temperature at 700-750℃ for 20-30min, and then adds it to the temperature of 1450-1480℃ and maintains it for 90-120min;

[0023] S3 pours the glass melt obtained by step S2 into deionized water to obtain glass particles, dries the glass particles after stabilization, and again performs ball milling treatment using a ball mill tank and anhydrous ethanol, and obtains lithium disilicate glass raw materials for preparing the first glass ceramic body and the second glass ceramic body after ball milling to a particle size of 3-5μm;

[0024] The raw materials of the first glass ceramic body and the second glass ceramic body are processed separately.

[0025] As a further limitation, the first glass ceramic body and the second glass ceramic body further comprise a dental dye.

[0026] As a further limitation, the first glass ceramic body is formed with a cement gap on the inner side surface of the inner concave profile cavity, and the gap thickness of the cement gap is 1.5-3.0 μm.

[0027] As a further limitation, the surface of the first glass ceramic body and the inner side surface of the second glass ceramic body are hydrophilic surfaces; the hydrophilic surfaces are obtained by a hydrofluoric acid surface etching method or a low-temperature plasma continuous surface spraying method.

[0028] As a further limitation, the thickness of the thinnest part of the support framework is greater than 1.5 mm; and the thickness of the resin reinforcement is 1 / 5-1 / 6 of the thickness of the support framework.

[0029] The resin reinforcement has a relatively thick thickness on the occlusal stress side in the oral cavity.

[0030] As a further limitation, the fiber reinforcement layer is a mixed fiber reinforcement layer with a mass ratio of boron fiber to carbon fiber of 1:8-1:5.

[0031] As a further limitation, the fiber reinforcement layer is a modified carbon fiber reinforcement layer, which is a modified carbon fiber reinforcement layer enhanced by B modification; the modification method is to deposit element B on the surface of the carbon fiber by chemical vapor deposition or to heat treat the carbon fiber at a high temperature of 1800-2100 ℃ using H3BO3, so that the boron infiltrated in the carbon fiber is solidified and attached to the surface of the carbon fiber.

[0032] As a further limitation, the all-ceramic tooth is directly used as a dental crown on the upper part of the second glass ceramic body.

[0033] As a further limitation, the all-ceramic tooth is formed with a zirconia ceramic dental crown on the surface of the second glass ceramic body; an adhesive gap is reserved between the second glass ceramic body and the zirconia ceramic dental crown, and a decorative glaze layer is formed on the surface of the zirconia ceramic dental crown.

[0034] The application also discloses a forming method of the all-ceramic tooth.

[0035] S1 modeling the human tooth to be processed to obtain relevant tooth morphology data or a model, and obtaining a whole tooth model of the all-ceramic tooth based on the tooth morphology data or the model;

[0036] S2, the first glass ceramic body and the second glass ceramic body are obtained by model cutting on the whole tooth model of the all-ceramic tooth;

[0037] S3, the color is adjusted according to the human tooth to be treated, the colorant toner is added into the corresponding lithium disilicate glass raw material, and then the mixture is subjected to ball milling treatment, and then the first glass ceramic body and the second glass ceramic body are subjected to die forming according to the tooth models obtained in step S2 by using an isostatic pressing forming process, so that the corresponding blanks are obtained;

[0038] S4, the obtained blanks are subjected to two-stage crystallization heat treatment, that is, the blanks are subjected to heat treatment at 650-680 DEG C for 5-6 hours, then the temperature is increased to 850-950 DEG C for heat treatment for 3-5 hours, and then the blanks are cooled to room temperature in the furnace after the crystallization treatment is completed, and then the blanks are polished and trimmed to obtain the corresponding first glass ceramic body and the second glass ceramic body;

[0039] S5, the reinforcing fibers are attached to the recessed side of the second glass ceramic body, then the corresponding resin material is injected into the preformed resin reinforcing body reserved space, and then the first glass ceramic body is embedded, and the finished product is obtained after the resin material is hardened and formed, which can be used for adhesive forming of the all-ceramic tooth in the position of the human tooth to be treated.

[0040] Beneficial effects: The all-ceramic tooth can be used for repairing the front teeth and the back teeth with discoloration, fluorine spots, enamel hypoplasia, conical shape and partial defects, and surface defects, and has the aesthetic appearance of porcelain and the realistic appearance of teeth, and the structure has good internal support performance, good structural stability, high strength and good wear resistance, and can achieve the ideal function and form of repairing missing teeth.

[0041] The first glass ceramic body structure has a small forming deformation amount on the abutting side of the abutment tooth, has good adhesion to the abutment tooth, can effectively reduce the polishing frequency and the bonding difficulty of the abutment tooth, and can greatly simplify the operation process and reduce the operation requirements of the doctor.

[0042] The resin reinforcing body and the fiber reinforcing layer are arranged, so that the denture is not easy to collapse during forming, the whole has good impact resistance on the outside, has a structural strength better than that of the traditional glass ceramic tooth, and can be used to improve the processing capacity of the denture to high-hardness food, so that the porcelain is not easy to break during use, the strength and service life of the crown are increased. BRIEF DESCRIPTION OF DRAWINGS

[0043] Fig. 1 It is a structure schematic view of the all-ceramic tooth of the first embodiment of the present application.

[0044] Fig. 2 It is a structure schematic view of the all-ceramic tooth of the second embodiment of the present application.

[0045] Fig. 3A schematic view of the all-ceramic tooth structure of the third embodiment of the present application.

[0046] 1. second glass ceramic body; 2. fiber reinforced layer; 3. resin reinforced body; 4. first glass ceramic body; 5. zirconia ceramic tooth crown; 6. enamel layer. DETAILED DESCRIPTION

[0047] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific drawings.

[0048] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed.

[0049] In addition, the three embodiments shown in the detailed description of the present application are only a part of the embodiments of the present application, and represent all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0050] Referring to Figs. 1-3 a preferred embodiment of an all-ceramic tooth, in Fig. 1 In the present embodiment shown, the all-ceramic tooth structure form of the basic style of the present application is shown, and the all-ceramic tooth shown is a denture that is formed by bonding on a posterior tooth to be repaired to obtain a better functional and aesthetic repair effect.

[0051] In this embodiment, the all-ceramic tooth as a denture includes a first glass ceramic body 4 and a second glass ceramic body 1, and the first glass ceramic body 4 has an inner concave profile cavity on the inner side that matches the modified abutment, the inner concave profile cavity has a profile line that fits the surface of the modified abutment, and the all-ceramic tooth can be fixed to the surface of the abutment by a bonding fixing process through an adhesive (such as glass ionomer cement) that can be used for denture bonding in the prior art. In order to facilitate the implementation of the above bonding function, a gap thickness of 1.5-3.0 μm gap can be formed on the inner side surface of the first glass ceramic body 4 corresponding to the inner concave profile cavity.

[0052] The second glass-ceramic body 1 is wrapped around the outer surface of the first glass-ceramic body 4 and has a chewing surface similar to that of a normal human posterior tooth. In this embodiment, the crown is directly formed on the upper part (outer upper surface) of the second glass-ceramic body 1. The all-ceramic tooth achieves the chewing function of a normal tooth through the crown part of the second glass-ceramic body 1.

[0053] The first glass-ceramic body 4 has a flattened overall structure. Besides a concave cavity on its inner side that encloses the abutment tooth surface, it has a relatively flat outer surface to facilitate the connection and fixation of the second glass-ceramic body 1, which encloses the first glass-ceramic body 4, on its outer surface. The second glass-ceramic body 1 has a flattened cavity with a willow-leaf-like cross-section on its corresponding inner mating surface through pre-forming and grinding. A resin reinforcement 3, matching the size and shape of the cavity, is obtained by vacuum filling this cavity. A fiber reinforcement layer 2 is also formed on the outer side of the resin reinforcement 3 corresponding to the mating surface of the second glass-ceramic body 1. The thickness of the resin reinforcement 3 is 1 / 5 to 1 / 6 of the thickness of the supporting skeleton, with a thicker thickness on the occlusal force side in the oral cavity. This results in the resin reinforcement 3 having a willow-leaf-shaped structure with a thinner overall profile and a slightly thicker profile on one side between the first glass-ceramic body 4 and the second glass-ceramic body 1.

[0054] Example 2 illustrates an improved structural form of Example 1. Compared to Example 1, it exhibits superior wear resistance. The improvement involves replacing the crown portion on the second glass-ceramic body 1 in Example 1 with a zirconia ceramic layer, thus obtaining the corresponding... Fig. 2 The zirconia ceramic crown 5 has an adhesive gap between it and the second glass ceramic body 1. The zirconia ceramic crown 5 is formed into one piece by dental adhesive and corresponding adhesive process at the adhesive gap. The forming method is similar to the adhesive forming process of porcelain on the surface of the abutment tooth.

[0055] In this embodiment, due to the superior surface wear resistance of zirconia ceramics, the service life and performance of the all-ceramic teeth of this embodiment can be effectively improved, giving them the same performance as those in Embodiment 1.

[0056] In addition, in the present embodiment, since the zirconia ceramic crown 5 only needs to utilize the wear resistance of the zirconia ceramic material and does not need to utilize the structural strength thereof, the zirconia ceramic crown 5 can adopt a thin layer structure, so as to achieve the purpose of weakening the dark and dull color of the zirconia ceramic and the poor modification effect, by reducing the thickness of the zirconia ceramic crown 5, thereby optimizing the appearance and decoration when the zirconia ceramic crown 5 is used as a crown, and the decoration performance of the all-ceramic tooth of the present embodiment can be further improved by forming a layer of enamel 6 on the surface of the zirconia ceramic crown 5.

[0057] The embodiment shown in Embodiment Three is the structure of the all-ceramic tooth of Embodiment Two with the structural features of the zirconia ceramic crown 5 and the enamel layer 6, which is applied to the front teeth, and has similar use effects as Embodiment Two. In addition, in Embodiment Three, due to the structural characteristics of the front teeth, the combination of the first glass ceramic body 4 and the second glass ceramic body 1 as a support framework should not be too thick, but considering the use performance needs, the thickness of the thinnest part of the support framework should be greater than 1.5 mm.

[0058] In the above three groups of embodiments, in order to obtain corresponding use performance, the first glass ceramic body 4 and the second glass ceramic body 1 are both lithium disilicate glass ceramic bodies, and the first glass ceramic body 4 has a greater material hardness than the second glass ceramic body 1. The realization of the above material hardness difference can be realized by changing the material formula of the first glass ceramic body 4 and the second glass ceramic body 1.

[0059] As in the technical solutions of the embodiments, the realization and adjustment of the hardness difference are realized by selecting to add ZrO2 and Al2O3 components in the same lithium disilicate glass ceramic body composition.

[0060] This is because the change of the mass fraction of ZrO2 has a strengthening effect on the lithium disilicate glass ceramic, which can improve the hardness of the lithium disilicate glass ceramic by adding ZrO2 with a mass fraction not exceeding 5% to the lithium disilicate base glass powder. When the prepared lithium disilicate base glass powder is added with different mass fractions of ZrO2, then static pressure forming, crystallization heat treatment, and then measuring the physical properties, the best effect is obtained when the addition amount is 3.5-4.0wt% of the total mass of the lithium disilicate glass ceramic raw materials, and the optimal addition ratio is 3.65wt%. When Y2O3 is added as a stabilizer when adding ZrO2, the crystal form of ZrO2 can be effectively stabilized, and the stability of the strengthening effect of ZrO2 on the lithium disilicate glass ceramic can be ensured. The Al2O3 component can coarsen the crystal form of Li2Si2O5 in the lithium disilicate glass ceramic and arrange it in an interlaced and interconnected manner, which can also improve the structural strength of the lithium disilicate glass ceramic to a certain extent and improve the crack resistance of the lithium disilicate glass ceramic after forming.

[0061] In addition, in the embodiments of the present application, the bonding performance of the first glass ceramic body 4 and the second glass ceramic body 1 can also be effectively ensured by using a lithium disilicate glass ceramic body with a similar formula during the molding of the first glass ceramic body 4 and the second glass ceramic body 1, so as to ensure the overall structural strength.

[0062] In the above three groups of embodiments of the present application, the purpose of improving the structural hardness of the first glass ceramic body 4 is to resist the stress impact transmitted from the abutment side during the upper and lower occlusion of the teeth, and this part of the stress impact is the normal stress impact during the normal use of the teeth; and the functions of the fiber reinforced layer 2 and the resin reinforced body 3 are to protect the full-ceramic tooth as a whole when the second glass ceramic body 1 side is subjected to a larger external force impact, and to protect the full-ceramic tooth from impact when the full-ceramic tooth is subjected to stress under abnormal conditions such as falling, hitting, and knocking of the human body, so as to reduce the damage probability of the full-ceramic tooth when subjected to the above external force impact.

[0063] The resin reinforced body 3 can be a Charisma PPF composite resin or a self-made reinforced resin; wherein the Charisma PPF composite resin, as a kind of commercial resin, is a resin containing 70% of high-barium-aluminum-chlorine-silicon-glass and silica particles and mainly composed of methacrylic acid, and when embedded between the two brittle materials of the first glass ceramic body 4 and the second glass ceramic body 1, it has better buffering protection performance for the impact force on the outside of the second glass ceramic body 1; and the self-made reinforced resin with methyl methacrylate as the matrix and uniformly dispersed with 2.5-3.5wt% of nano-quartz particles and 0.8-1.5wt% of alkali-free glass fibers treated by epoxy silane on the surface also has similar effects.

[0064] The fiber reinforced layer 2 can be a hybrid fiber reinforced layer or a modified carbon fiber reinforced layer. When the hybrid fiber reinforced layer is selected, the corresponding reinforcing fiber is a hybrid fiber with a mass ratio of boron fiber to carbon fiber of 1:8 to 1:5. The fiber structure layer in the hybrid form of boron fiber and carbon fiber has excellent hardness, rigidity and strength in the range of small size, and has excellent structural stability and tensile resistance, so that the second glass ceramic body 1 can maintain the structural performance of the second glass ceramic body 1 under the action of the resin reinforcing body 3 when subjected to strong impact force on the outside, and also has the effects of preventing the second glass ceramic body 1 from cracking, generating internal cracks and inhibiting the growth of internal cracks, thereby prolonging the problem of the shape of the full ceramic tooth. The modified carbon fiber reinforced layer reinforced by B modification also has similar effects, and because the combination form of B and carbon fiber in the modified carbon fiber reinforced by B modification is better, the modified carbon fiber reinforced by B modification has the effects of preventing the second glass ceramic body 1 from cracking, generating internal cracks and inhibiting the growth of internal cracks. The method of B modification and reinforcement can be selected to use chemical vapor deposition to deposit element B on the surface of carbon fiber or use H3BO3 to heat treat carbon fiber at a high temperature of 1800-2100°C, so that the boron infiltrated in the carbon fiber is solidified and attached to the surface of the carbon fiber.

[0065] In the above embodiment of the application, the full ceramic tooth is a tooth structure formed by a glass ceramic restoration, and the material properties of the tooth structure itself are poor in forming effect with the adhesive. The key to the success of the glass ceramic restoration in clinical application lies in whether the bonding between the glass ceramic and the adhesive is reliable and firm. The key to the success of the glass ceramic restoration in clinical application lies in whether the bonding between the glass ceramic and the adhesive is reliable and firm. The surface pretreatment of the glass ceramic is an important factor affecting the bonding effect. In order to further improve the bonding performance of the second glass ceramic body 1 and the first glass ceramic body 4 as a connecting structure, the technical scheme of the embodiment obtains a hydrophilic surface on the surface of the first glass ceramic body and the inner surface of the second glass ceramic body by means of hydrofluoric acid surface etching or low-temperature plasma continuous surface spraying.

[0066] Among them, the hydrofluoric acid etching treatment is a widely used surface pretreatment method for glass ceramic restoration in clinical practice. The advantages of this method are that the treatment cost is relatively low, the glass ceramic surface can be roughened and cleaned, and the bonding effect is enhanced. However, the defects are that hydrofluoric acid has strong corrosive and toxic properties, and the operation requires high requirements. In addition, the transition etching of hydrofluoric acid also has the risk of reducing the mechanical strength of the glass ceramic. The low-temperature plasma continuously bombards the surface of the glass ceramic through a large number of high-activity particles in the plasma, thereby introducing active functional groups on the surface of the glass ceramic, thereby improving the hydrophilicity and bonding performance of the glass ceramic surface. This treatment method has few side effects, but the defect is that the treatment cost is relatively high.

[0067] Meanwhile, in different embodiments, the above two processing methods are also applicable to the surface treatment of the zirconia ceramic crown 5 in Embodiment Two and Embodiment Three, to obtain a hydrophilic surface on the zirconia ceramic crown 5.

[0068] In order to facilitate the description of the effects of the present application, the full ceramic tooth in the form of Embodiment One is prepared in the following manner:

[0069] First, the raw material components of the first glass ceramic body are determined as follows: 75 parts of SiO2; 32 parts of Li2O; 4 parts of K2O, 2.5 parts of P2O5, 2.5 parts of Al2O3, and 4.5 parts of ZrO2; and the raw material components of the second glass ceramic body are determined as follows: 75 parts of SiO2; 32 parts of Li2O; 4 parts of K2O, 2.5 parts of P2O5.

[0070] Among them, Li2O is introduced in the form of Li2CO3 after mass conversion; K2O is introduced in the form of K2CO3 after mass conversion; SiO2, P2O5, Al2O3, and ZrO2 are introduced in the form of oxide powder, and Y2O3 accounts for 2-3wt% of the mass of ZrO2 as a stabilizer.

[0071] The above-mentioned raw materials of the first glass ceramic body and the raw materials of the second glass ceramic body are treated in the same way. During the treatment, the raw materials are weighed according to the above-mentioned mass parts, mixed, and then added to a ball mill tank together with anhydrous ethanol, and ball milled for 8h. After ball milling, it is taken out and placed in an oven, and dried at a set temperature of 80℃ to obtain a mixed powder.

[0072] The dried mixed powder is added to a quartz crucible, and the quartz crucible is heated and melted. The furnace temperature of the melting furnace is raised to 750℃ at a rate of 10℃ / min, and then raised to 1450℃ at a rate of 30℃ / min after holding for 20min, and maintained for 120min to ensure that the components are fully melted and reacted.

[0073] The molten glass melt obtained by melting is poured into deionized water to obtain glass particles. After the glass particles are stable, they are taken out and dried. The ball mill tank and anhydrous ethanol are used again for 10h of ball milling. After ball milling, it is taken out and placed in an oven, and dried at a set temperature of 80℃ to obtain a second mixed powder. The second mixed powder is sieved to obtain a particle size of 3-5μm, which is used as lithium disilicate glass raw material I and lithium disilicate glass raw material II for preparing the first glass ceramic body and the second glass ceramic body.

[0074] The non-contact laser scanning device is used to scan the tooth to be repaired of the patient, the scanning range includes the whole tooth and the jaw, the data obtained by scanning is transmitted to the PC, the three-dimensional data of the tooth is edited, processed, screened and modeled by using the three-dimensional software, and the technical scheme to be repaired and the full porcelain tooth model are obtained. According to the full porcelain tooth model obtained by the above steps, vector drawing is performed on the full porcelain tooth model, and the shape and size of the second glass ceramic body 1 and the first glass ceramic body 4 are determined. It should be noted that in this step, the software technology for assisting tooth repair in the prior art in the art is needed, but the above technology does not constitute the protection content of the technical scheme, and is only used to improve the accuracy, optimize the forming effect and reduce the time consumption when the tooth model is obtained; and the technical scheme of the application can also use the traditional plaster molding method, and the effect is the same or similar.

[0075] On the basis of the shape and size of the second glass ceramic body 1 and the first glass ceramic body 4 determined, the second glass ceramic body 1 and the first glass ceramic body 4 are prepared by using lithium disilicate glass raw material I and lithium disilicate glass raw material II respectively. Before preparation, the color is adjusted according to the color of the patient's tooth, the corresponding toner or other dyeing agent is obtained, the corresponding toner or other dyeing agent is added to the corresponding lithium disilicate glass raw material I or lithium disilicate glass raw material II, and then mixed and ball milled with anhydrous ethanol for 30 min. After the treatment is completed, deionized water is added and loaded into a prefabricated mold. First, a cylindrical powder blank is pressed out at a pressure of 15 MPa, and then the cylindrical powder blank is added to an isostatic pressing device and isostatic pressing is performed at a set pressure of 280 MPa for 50 min. After the treatment is completed, the corresponding second glass ceramic body 1 blank or first glass ceramic body 4 blank is obtained.

[0076] The obtained second glass ceramic body 1 blank and first glass ceramic body 4 blank are subjected to two-stage crystallization heat treatment. In the two-stage crystallization heat treatment, the temperature is first raised to 650 DEG C at a rate of 10 DEG C / min, and then the temperature is raised to 900 DEG C at a rate of 10 DEG C / min after holding for 6 h. The crystallization treatment is completed by keeping the temperature at 900 DEG C for 5 h, and then the temperature is cooled to room temperature. After polishing and repairing, the first glass ceramic body 4 and the second glass ceramic body 1 after finishing are obtained.

[0077] The 100 experimental first glass ceramic bodies 4 and the corresponding second glass ceramic bodies 1 obtained by the above steps are subjected to mechanical property testing. The density of the first glass ceramic body 4 is 2.48+ / -0.05 g / cm 3 , the bending strength is 328+ / -25 MPa, and the microhardness is 5583+ / -56 MPa; and the density of the second glass ceramic body 1 is 2.43+ / -0.03 g / cm 3, bending strength of 331 ± 25 MPa, microhardness of 5552 + 61 MPa.

[0078] The first glass ceramic body 4 and the second glass ceramic body 1 after finishing are attached with 9.5% hydrofluoric acid slow-release gel on the outer surface of the first glass ceramic body 4 and the inner surface of the second glass ceramic body 1, and the above-mentioned surfaces are treated by hydrofluoric acid etching for 1 min, then the gel is removed, ultrasonic cleaned with deionized water and dried; after the drying treatment is completed, the fiber reinforced layer 2 is formed by attaching reinforcing fibers on the second glass ceramic body 1 corresponding to the position of the fiber reinforced layer 2 on the concave side. In this embodiment, the reinforcing fibers used in the fiber reinforced layer 2 are obtained from the relevant graphite fiber manufacturers, and the relevant process is to modify the PAN precursor with boric acid during the production process of polyacrylonitrile carbon fiber, and to carbonize the PAN precursor at a high temperature of 1800°C. In this process, the boron content in the PAN precursor gradually decreases with the increase of temperature, and boride particles appear on the surface of the fiber. Because the boride particles occupy the pores of the PAN fiber, they hinder the diffusion of oxygen and the oxidation reaction during the stabilization process. However, because the initial boron content in the PAN precursor is low, it does not affect the change of the crystallite size of the carbon fiber during graphitization, so it can significantly improve the orientation degree of the crystallite of the carbon fiber after forming, so that the Young's modulus of the carbon fiber in the modified carbon fiber reinforced layer is significantly improved, thereby improving the physical strength.

[0079] Then, the Charisma PPF composite resin is injected into the preformed resin reinforced body space in the inner side of the second glass ceramic body 1 attached with the fiber reinforced layer 2, and embedded into the first glass ceramic body 4. After the bubbles are discharged, the resin material is hardened to form the finished product.

[0080] The finished product can be directly glued and formed on the surface of the human tooth to be treated. During the gluing and forming, the abutment is polished according to the size obtained in the computer modeling stage of the above process to adapt to the inner concave profile cavity of the inner side of the first glass ceramic body 4, and then the glass ionomer cement is used as the adhesive, and the same bonding process as the porcelain tooth gluing process is used to bond and fix the above-mentioned finished product on the abutment surface after polishing, which is smaller than the original tooth, that is, the denture repair work is completed.

[0081] In a certain chain dental hospital and community outpatient oral department in Loudi City, Hunan Province, patients with tooth defects, fractures, discoloration, deformity, and missing repair were selected for repair, a total of 176 patients, a total of 384 single teeth: 98 of them were selected for repair according to the above method of the embodiment, 96 were repaired with zirconium dioxide all-ceramic crowns as comparative group one, 94 were repaired with lithium disilicate glass ceramic body all-ceramic crowns as comparative group two, and 96 were repaired with glass ceramic crown and zirconia ceramic support framework all-ceramic crown as comparative group three. After half a year and one year of follow-up, the statistical data are as follows:

[0082] Among them, the integrity of the restoration refers to maintaining the integrity of the denture without considering wear; loose refers to the patient's own feeling that the denture has a loose feeling between the abutment; surface wear is more than 5% to the surface wear of the crown; cracking and partial shedding include the cases of denture cracking, layer peeling, breaking, partial shedding and complete shedding in the presence of abutment, excluding the cases of abutment and denture shedding / extracting together:

[0083]

[0084] Based on the above data, the all-ceramic tooth prepared by the technical scheme of the embodiment is slightly inferior to the zirconium dioxide all-ceramic crown in terms of wear resistance, but other performances are better than the two comparative groups. Due to the glass ceramic properties of the second glass ceramic body itself, the light transmittance is obviously better than that of the zirconium dioxide all-ceramic crown, so the repair molding effect is obviously better than that of the zirconium dioxide all-ceramic crown, close to that of the lithium disilicate glass ceramic body all-ceramic crown, and the adjacent tooth surface shape is coordinated, giving oneself and others a complete and harmonious beauty.

[0085] In addition, due to the all-ceramic material properties of the all-ceramic tooth of the embodiment, it will not have the problem of "black line" of ordinary porcelain teeth, and is not prone to allergic reactions. In addition, due to the non-metal properties of the all-ceramic tooth, it will not be adversely affected by X-ray, CT and nuclear magnetic resonance examination.

[0086] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An all-ceramic tooth, characterized in that, The support framework and the tooth crown formed on the surface of the support framework; The support framework is a composite structure, comprising a first glass ceramic body formed on the inner side and a second glass ceramic body formed on the outer side; the first glass ceramic body and the second glass ceramic body are both lithium disilicate glass ceramic bodies obtained by molding and heat treating lithium disilicate glass raw materials, and the first glass ceramic body has a higher structural hardness than the second glass ceramic body; The first glass ceramic body has a concave profile cavity on the side of the abutment tooth, which matches the surface of the abutment tooth; the full-ceramic tooth is fixed to the surface of the abutment tooth by a bonding fixation process at the position of the concave profile cavity; The second glass ceramic body is wrapped on the outer surface of the first glass ceramic body; A flat resin reinforcement is formed between the first glass ceramic body and the second glass ceramic body, and a fiber reinforcement layer is interposed between the resin reinforcement and the second glass ceramic body; The resin reinforcement is Charisma PPF composite resin or self-made reinforced resin; the self-made reinforced resin has a methyl methacrylate matrix, and uniformly dispersed in the matrix are 2.5-3.5wt% nano quartz particles and 0.8-1.5wt% alkali-free glass fibers treated by an epoxy silane surface treatment; The second glass ceramic body comprises the following components by mass: 70-80 parts of SiO2, 30-35 parts of Li2O, 3-5 parts of K2O, and 1.5-3.0 parts of P2O5; Li2O is introduced in the form of Li2CO3 after mass conversion; K2O is introduced in the form of K2CO3 after mass conversion; The first glass ceramic body further comprises 2-3 parts of Al2O3 and 3.5-4.0wt% of ZrO2 based on the total mass of the raw materials of the first glass ceramic body, and the ZrO2 comprises 2-3wt% of Y2O3 as a stabilizer based on the mass of the ZrO2; The raw material treatment of the first glass ceramic body and the second glass ceramic body is as follows: S1. The raw materials are weighed according to the mass ratio, added to a ball mill tank, ball milled with anhydrous ethanol, and then the mixture is dried; S2. The dried mixture is subjected to two-stage melting, i.e., first kept at a temperature of 700-750℃ for 20-30min, and then added to a temperature of 1450-1480℃ and kept for 90-120min; S3. The glass melt obtained in step S2 is poured into deionized water to obtain glass particles, which are dried after stabilization, and then subjected to ball milling with a ball mill tank and anhydrous ethanol to obtain lithium disilicate glass raw materials with a particle size of 3-5μm for preparing the first glass ceramic body and the second glass ceramic body; The raw materials of the first glass ceramic body and the second glass ceramic body are treated separately.

2. The all-ceramic tooth according to claim 1, characterized in that The raw materials of the first glass ceramic body and the second glass ceramic body further comprise a dental dye.

3. The all-ceramic tooth according to claim 1, characterized in that The surface of the first glass ceramic body and the inner surface of the second glass ceramic body are hydrophilic surfaces; the hydrophilic surfaces are obtained by a hydrofluoric acid surface etching method or a low-temperature plasma continuous surface spraying method.

4. The all-ceramic tooth according to claim 1, characterized in that The thickness of the thinnest part of the support framework is greater than 1.5 mm; the thickness of the resin reinforcement is 1 / 5 to 1 / 6 of the thickness of the support framework; and the resin reinforcement has a relatively thick thickness on the side corresponding to the occlusal stress in the oral cavity.

5. The all-ceramic tooth according to claim 1, characterized in that The fiber reinforcement layer is a mixed fiber reinforcement layer with a mass ratio of boron fiber to carbon fiber of 1:8 to 1:

5.

6. The all-ceramic tooth of claim 1, wherein, The fiber reinforcement layer is a modified carbon fiber reinforcement layer, which is a modified carbon fiber reinforcement layer enhanced by B modification; the modification method is to deposit element B on the surface of the carbon fiber by chemical vapor deposition or to heat treat the carbon fiber at a high temperature of 1800 to 2100 DEG C using H3BO3, so that the boron infiltrated in the carbon fiber is solidified and attached to the surface of the carbon fiber.

7. The all-ceramic tooth according to claim 1, characterized in that The all-ceramic tooth is directly formed on the upper part of the second glass ceramic body as a tooth crown.

8. The all-ceramic tooth according to claim 1, characterized in that The all-ceramic tooth is formed with a zirconia ceramic tooth crown on the surface of the second glass ceramic body; an adhesive gap is reserved between the second glass ceramic body and the zirconia ceramic tooth crown, and a decorative glaze layer is formed on the surface of the zirconia ceramic tooth crown.

9. A forming method of an all-ceramic tooth, characterized by, The method is used for preparing the all-ceramic tooth according to any one of claims 1-8, and the method specifically comprises the following operation steps: Modeling the human tooth to be treated to obtain relevant tooth morphology data or a model, and obtaining a whole tooth model of the all-ceramic tooth based on the tooth morphology data or the model; Modeling the whole tooth model of the all-ceramic tooth to obtain tooth models of the first glass ceramic body and the second glass ceramic body; Color matching according to the human tooth to be treated, adding a dye colorant to the corresponding lithium disilicate glass raw material, mixing and ball milling, and then using an isostatic pressing process to perform die pressing forming according to the tooth models of the first glass ceramic body and the second glass ceramic body obtained in step S2, to obtain corresponding blanks; Performing two-stage crystallization heat treatment on the obtained blanks; first heat treating at 650-680 DEG C for 5-6 h, then heat treating at 850-950 DEG C for 3-5 h, and after the crystallization treatment is completed, grinding and repairing the blanks after cooling to room temperature in the furnace, to obtain the corresponding first glass ceramic body and the second glass ceramic body; Lining the second glass ceramic body with reinforcing fibers on the concave side, then injecting the corresponding resin material into the preformed resin reinforcement reserved space, and then embedding the first glass ceramic body, to obtain the finished product after the resin material is hardened, which can be used for adhesive forming of the all-ceramic tooth on the human tooth to be treated.

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