Removable digital guide for fiber post and resin core restoration and manufacturing method

Abstract

The application discloses a detachable digital guide plate for assisting fiber post and resin core repair and a manufacturing method. The detachable digital guide plate comprises a base guide plate and a post core guide plate assembled through a mortise and tenon joint structure. The guide plate is manufactured by using digital technology, fully considering the complexity and individual differences of the root canal morphology of natural teeth, and setting the post core position with the expected repair effect as the target, effectively assisting the accurate positioning and forming of the post core in the tooth defect repair, the fiber post bonding and the resin nucleation, especially suitable for the complex repair treatment of the multi-abutment row joint crown or fixed bridge. Not only can the guide plate assist the accurate positioning and bonding of the fiber post, but also can control the nucleation space position and shape of each post core, effectively assist the multi-abutment to obtain the common positioning channel, reduce the clinical operation difficulty, improve the operation accuracy and the quality of the oral repair treatment, and reduce the tooth preparation time of the clinician at the chair.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oral medicine, and in particular to a detachable digital guide plate for assisting fiber post and resin core repair and a manufacturing method thereof. BACKGROUND

[0002] Dental defect is one of the common and frequently-occurring diseases in oral clinical practice, which refers to the destruction of different degrees of shape, color and structure of dental hard tissue due to caries, trauma and dental developmental diseases and other reasons. The repair treatment method of dental defect is closely related to the degree of dental defect, mainly including resin filling, veneer, inlay, partial crown, full crown, post and core crown and other repair methods.

[0003] For severely damaged residual root and crown, due to the large amount of dental tissue defect and the serious shortage of remaining dental tissue, the use of full crown alone often cannot obtain good retention, and the space in the root canal often needs to be used to provide support and retention, that is, post and core crown. With the progress of repair materials and the rapid increase of oral aesthetic demand, fiber post and resin core are the widely used post and core repair system at home and abroad, and the clinical operation process is that the clinician inserts and bonds the fiber post into the root canal which has been prepared for root canal post channel, uses the nucleated resin to manually stack the resin core based on the fiber post, and then performs dental preparation after the nucleated resin material is completely cured.

[0004] In the clinical operation of post and core crown, the following difficulties exist:

[0005] 1. Due to the complexity and individual differences of the morphology of natural tooth root canal, the manual stacking of nucleated resin under free hand depends greatly on the clinical technology and experience of the doctor. For young doctors who lack clinical experience, it is difficult to use the nucleated resin with fluidity to manually stack the resin core and form a good abutment shape during the operation process.

[0006] 2. Due to the individual differences of the expected repair effect, the ideal space and position of the resin core and the abutment after nucleation are not the same. Therefore, when the nucleated resin is stacked under free hand, a large amount of resin is often used to make up for the individual differences of the resin core, which will result in a large amount of waste of resin material and more time for dental preparation of the abutment after the nucleation of the resin core. Especially when multiple teeth are involved in the repair, the number of posts and cores is large, the loss of resin material and the chair-side operation time are greatly increased, and the time cost of doctors and patients is also significantly increased.

[0007] 3. When performing the pile core repair of multi-unit joint crown, the acquisition of the common seating channel of the post-core of the resin core mainly depends on the clinical experience of the doctor and the observation and adjustment of the three-dimensional shape of each post-core at any time. Due to the uneven level of clinical experience of doctors, there are certain errors and individual differences in visual inspection alone, therefore, doctors usually increase the tooth preparation amount and increase the axial aggregation degree of the abutment to achieve the common seating channel of multiple abutments. However, the increase of the tooth preparation amount and the axial aggregation degree of the abutment will lead to poor retention of the abutment and insufficient retention of the restoration.

[0008] 4. For multi-unit or joint crown pile core crown repair, the non-removable pile core guide plate also needs to first meet the requirements of the common seating channel of the pile core before being worn, therefore, the non-removable pile core guide plate still has the problems of difficulty in wearing, excessive tooth preparation and increase of the axial aggregation degree of the abutment. SUMMARY

[0009] Therefore, the application provides a detachable digital guide plate for assisting fiber pile and resin core repair and a manufacturing method. In the repair of single tooth body defect, the detachable digital guide plate can assist the accurate seating and bonding of the fiber pile and the accurate positioning and forming of the resin core. In the multi-abutment joint crown or fixed bridge complex repair treatment, the detachable digital guide plate can accurately control the nucleation space position and shape of each pile core, effectively assist multiple abutments to obtain a common seating channel, reduce the difficulty and technical sensitivity of clinical operation, improve the operation accuracy and oral repair treatment quality, reduce material waste and chair-side tooth preparation time of the clinician.

[0010] In a first aspect, the application provides a detachable digital guide plate for assisting fiber pile and resin core repair, comprising a base guide plate and a pile core guide plate for assisting fiber pile bonding and resin core nucleation, which are assembled through a mortise and tenon connection structure.

[0011] The base guide plate is provided with a tenon, a seating inspection window and a reinforcing rod.

[0012] The pile core guide plate is provided with a mortise, a disassembly auxiliary handle, a fiber pile insertion and resin injection hole and a resin core nucleation cavity.

[0013] Optionally, the tenon is configured on the surface of the base guide plate, and the tenon is a solid square retention bolt structure.

[0014] Optionally, the base guide plate is retained by tooth support, and the range thereof extends to 1-5 adjacent teeth on both sides of the abutment to be repaired by pile core, and the visual seating inspection window is configured at the abutment of the adjacent teeth on both sides of the pile core repair abutment.

[0015] Optionally, the reinforcing rod is configured on the lingual side of the base guide plate.

[0016] Optionally, the mortise is configured on the surface of the post and core guide as a retention hole structure with a size and shape suitable for the tenon.

[0017] Optionally, the disassembly auxiliary handle is configured on the lingual end of the post and core guide.

[0018] Optionally, the resin core nucleation cavity is configured on the inner side of the post and core guide, and the shape and position of the resin core nucleation cavity are designed based on the expected restoration target.

[0019] Optionally, the fiber post insertion and resin injection hole is configured on the surface of the post and core guide.

[0020] In a second aspect, the application provides a method for manufacturing the detachable digital guide for assisting the fiber post and resin core restoration, comprising the following steps:

[0021] A. Scanning the upper and lower dental arches using a digital intraoral scanner to obtain digital impressions and models of the upper and lower dental arches; scanning the patient's head using CBCT to obtain digital impressions and models of the jaw and teeth;

[0022] B. Based on the upper and lower digital impressions and models, determining the expected restoration effect and the three-dimensional shape of the target restoration, and obtaining a virtual digital diagnostic wax pattern;

[0023] C. Reducing the virtual digital diagnostic wax pattern according to the required space of the restoration, obtaining the three-dimensional shape of the prepared abutment and the digital impressions and models with the resin core shape;

[0024] D. Fitting and registering the three-dimensional shape of the prepared abutment and the digital impressions and models with the resin core shape, the jaw and tooth structure model through data fitting and registration to design the post and core guide;

[0025] E. 3D printing the detachable digital guide.

[0026] Optionally, the step B comprises:

[0027] According to the principles of oral aesthetic restoration, the facial image (facial photograph or facial three-dimensional scanning data, etc.) of the patient's smile state and the data of the upper and lower digital models are used for personalized digital aesthetic analysis and design by means of pre-set tools, to obtain the expected restoration effect and the three-dimensional shape of the target restoration;

[0028] According to the three-dimensional shape of the target restoration, a virtual digital diagnostic wax pattern is obtained.

[0029] Optionally, the predetermined space required by the prosthesis is specifically: the incisal edge repair space is at least 1-1.5mm, the labial repair space is at least 0.8-1mm, the lingual repair space is at least 0.8-1mm, the mesial-distal repair space is at least 1mm, and the degree of polymerization is not greater than 12°.

[0030] Optionally, in the reduction process of step C, if the post and core of the multi-unit connector abutment is positioned and formed, the common seating channel is considered on the basis of the conventional recommended value of the reserved crown repair space, and then the repair space is set.

[0031] Optionally, step D further comprises, after the registration is completed, determining the position of the fiber post and the position of the fiber post on the resin core on the basis of at least 4-5mm of the tooth gel reserved as the root tip sealing, the shape of the upper root canal and the suitable post channel direction, and then determining the position of the fiber post insertion and the resin injection hole.

[0032] Compared with the prior art, the present application has the following characteristics:

[0033] 1. The application of the guide plate solves the problems of difficult shaping, long trimming time and waste of resin material when the resin core is shaped by free hand, effectively improving the operation precision and the quality of oral repair treatment.

[0034] 2. The guide plate not only assists the accurate positioning and bonding of the fiber post, but also controls the nucleation space position and shape of each post and core, and realizes precise nucleation on the basis of ensuring sufficient full crown repair space.

[0035] 3. In the multi-unit post and core repair in the multi-abutment connector or fixed bridge complex repair treatment, the common seating channel of the post and core is determined by digital design, and the experience and observation of the clinician are not relied on too much. The application of the guide plate can accurately control the nucleation space position and shape of each post and core, effectively assist the multi-abutment to obtain the common seating channel, reduce the difficulty and technical sensitivity of clinical operation, and reduce unnecessary chair-side tooth preparation time.

[0036] 4. The guide plate can be used in sections, and can be easily disassembled and assembled, avoiding the problem that the guide plate cannot be removed due to the absence of a common seating channel. BRIEF DESCRIPTION OF DRAWINGS

[0037] The technical solutions and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application, combined with the accompanying drawings.

[0038] Figure 1 A manufacturing process of a detachable digital guide plate for assisting fiber post and resin core repair is provided for the embodiments of the present application.

[0039] Figure 2An overall structure schematic diagram of a detachable digital guide plate for assisting fiber post and resin core repair is provided for the embodiments of the present application.

[0040] Figure 3 A partial structure schematic diagram of a base guide plate is provided for the embodiments of the present application.

[0041] Figure 4 A partial structure schematic diagram of a post and core guide plate is provided for the embodiments of the present application.

[0042] In the drawings, the elements are identified as follows:

[0043] 1-base guide plate; 2-post and core guide plate; 3-mortise and tenon joint structure; 301-mortise; 302-tenon; 4-in-place checking window; 5-strengthening rod; 6-detaching auxiliary handle; 7-resin core nucleation cavity; 8-fiber post insertion and resin injection hole. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0046] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] The disclosure hereafter provides many different embodiments or examples for implementing various aspects of the present application. Throughout the disclosure, specific examples of components and arrangements are described. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application can be used in different examples with different components and / or arrangements. Furthermore, the present application provides various examples of the processes and materials used therein, although other processes and / or materials can be used as appreciated by one skilled in the art.

[0048] Example 1

[0049] Referring to Figure 1 Embodiment 1 provides the manufacturing process of the detachable digital guide plate for the fiber post and resin core restoration, including the following steps:

[0050] (1) Use a digital intraoral scanner to scan the digital impression and model of the upper and lower dental arches, and save it as a first stl format data;

[0051] (2) Take CBCT (Cone Beam Computed Tomography) to obtain the digital impression and model of the jaw bone and teeth, and save it as dicom format data;

[0052] (3) Import the obtained first stl format file into a three-dimensional design software, and fit it with the facial image of the patient's smile state (facial photograph or facial three-dimensional scanning data, etc.), and perform personalized digital aesthetic analysis and design according to the principles of oral aesthetic restoration, construct the three-dimensional form of the expected restoration effect and the target restoration, obtain the virtual digital diagnostic wax pattern, and save it as a second stl format data;

[0053] (4) Reduce the virtual digital diagnostic wax pattern in the second stl format data according to the conventional recommended value of the tooth preparation amount required by the target restoration, if the post and core positioning and forming of the multi-unit joint crown abutment is required, the common seating channel should be considered on the basis of the conventional recommended value of the crown repair space, and further set the repair space. Obtain the three-dimensional form of the abutment after tooth preparation and the digital impression and model with resin core form, and save it as a third stl format data;

[0054] (5) Design of the detachable digital guide plate for the fiber post and resin core restoration:

[0055] (5.1) The virtual abutment three-dimensional form after tooth preparation and the third stl format data of the digital impression and model with resin core form are fitted with the dicom format data of the digital impression and model of the jaw bone and teeth by using three-dimensional design software. After registration, the digital model with resin core, tooth root and root canal is obtained. The position of the fiber post is designed according to the position and form of the resin core and the form and direction of the root canal. The digital design model of the detachable digital guide plate for auxiliary fiber post and resin core repair is further designed;

[0056] (5.2) The base guide plate 1 and the post and core guide plate 2 are set on the digital design model of the detachable digital guide plate for auxiliary fiber post and resin core repair. The tenon 301, the in-place checking window 4, the reinforcing rod 5, the fiber post insertion and resin injection hole 8 are set on the base guide plate 1. The mortise 302 is set on the post and core guide plate 2. The resin core nucleation cavity 7 is set. The base guide plate 1 and the post and core guide plate 2 are detachably assembled through the mortise and tenon connection structure 3.

[0057] (6) The designed guide plate digital model is made by 3D printing using transparent rigid polymer resin material with good biocompatibility and not affecting the curing of nucleated resin. After trimming and disinfection, it can be used for clinical operation.

[0058] For specific embodiments, see Figure 2 The structure design of the detachable digital guide plate for auxiliary fiber post and resin core repair is based on the virtual abutment three-dimensional form after tooth preparation and the third stl format data of the digital impression and model with resin core form and the dicom format data of the digital impression and model of the jaw bone and teeth. It includes 3D printed base guide plate 1 and 3D printed post and core guide plate 2. The 3D printed base guide plate 1 and the post and core guide plate 2 are detachably assembled through the mortise and tenon connection structure 3.

[0059] For specific embodiments, see Figures 2-4 The specific steps of the above mortise and tenon connection structure 3 are as follows: the tenon 301 is designed on the base guide plate 1, which is a solid square retention bolt structure, the axial direction is consistent with the axial direction of the resin core of the corresponding tooth. The mortise 302 is designed on the post and core guide plate 2, which is a retention hole structure suitable for the size and shape of the tenon. The two guide plates are inserted into the mortise and tenon, thereby forming a square mortise and tenon connection structure 3.

[0060] For specific embodiments, see Figure 3 The specific steps of the above base guide plate 1 are as follows: the base guide plate 1 is a tooth support type retention, which extends to the two sides 1-5 adjacent teeth of the abutment to be repaired by post and core repair, and a visual in-place checking window 4 is provided at the adjacent position of the adjacent teeth of the abutment to be repaired by post and core repair. The reinforcing rod 5 is provided on the lingual side, and the two ends of the reinforcing rod 5 are connected to the lingual side of the base guide plate 1.

[0061] In specific embodiments, see Figure 4 The specific steps for designing the post and core guide 2 are as follows: a disassembly auxiliary handle 6 is provided on the lingual side, and the size is determined to ensure its strength and not affect the positioning. A resin core forming cavity 7 is provided on the inner side. A fiber post insertion and resin injection hole 8 is provided on the surface.

[0062] In specific embodiments, see Figure 4 The specific steps for designing the resin core forming cavity 7 are as follows: the virtual digitized diagnostic wax pattern in the second stl format data is reduced according to the conventional recommended value of the tooth preparation amount required by the target restoration: the cutting end restoration space is at least 1-1.5mm, the labial restoration space is at least 0.8-1mm, the lingual restoration space is at least 0.8-1mm, the mesial and distal restoration space is at least 1mm, and the polymerization degree is not more than 12°. If the post and core positioning and forming for the abutment of multi-unit joint crown is used, the common positioning channel should be considered on the basis of the conventional recommended value of the reserved crown restoration space, and the restoration space is further set.

[0063] In specific embodiments, see Figure 4 The specific steps for designing the fiber post insertion and resin injection hole 8 are as follows: the third stl format data is fitted with the dicom format data, and the digital model with resin core, tooth root and root canal is obtained after registration. According to the position and shape of the resin core and the shape and direction of the root canal, the position of the fiber post is designed, the root canal axial direction of the root canal preparation is marked when the root tip is reserved at least 5mm of the tooth gel, the position of the fiber post insertion and resin injection hole is determined, and the position of the fiber post insertion and resin injection hole is determined.

[0064] Example 2

[0065] Embodiment 2 provides the clinical use process of the auxiliary fiber post and resin core repair detachable digital guide, including the following steps:

[0066] (1) The auxiliary fiber post and resin core repair detachable digital guide is tried on in the clinic, and whether the 3D printed base guide is completely positioned and fixed on the dentition is checked through the visual positioning inspection window 4, whether the base guide 1 and the post and core guide 2 are closely connected is checked, and after determining that it is completely positioned, the base guide 1 and the post and core guide 2 are removed.

[0067] (2) The post channel preparation and fiber post trial of the affected tooth are carried out.

[0068] (3) The base guide 1 is worn and completely positioned on the dentition.

[0069] (4) After the adhesive is applied, the nucleated resin is injected into the post channel in the dark, the single post core guide 2 is quickly connected, and after positioning, the fiber post is inserted and the nucleated resin is injected into the resin core nucleation cavity 7 through the resin injection hole 8 to fill the resin and insert the fiber post.

[0070] (5) After photocuring, the excess fiber post structure is removed using a dental handpiece and a bur, the post core guide 2 is gently removed by disassembling the auxiliary handle 6, and the fiber post and resin core repair are completed after slight polishing.

[0071] (6) If used for multiple tooth post core repair, the single post core guide 2 can be removed after the fiber post bonding and resin core nucleation operations are completed, and in this process, the base guide 1 is fixed on the dentition, and steps (2)-(5) are repeated.

[0072] Example 3

[0073] The present example 3 provides a method for using a detachable digital guide to assist in the repair of a single tooth fiber post and resin core, and the remaining steps are the same. The base guide 1 is retained by the tooth, and the range of the base guide 1 extends from the abutment tooth adjacent to the two adjacent teeth on both sides of the post core repair abutment tooth by 1-5 teeth, and a visual positioning check window 4 is provided at the abutment of the two adjacent teeth adjacent to the post core repair abutment tooth.

[0074] Example 4

[0075] The present example 4 provides a method for using a detachable digital guide to assist in the repair of multiple teeth fiber post and resin core, and the remaining steps are the same. The resin core nucleation cavity 7 should consider the common positioning channel on the basis of the standard reserved repair space of the late crown, and further set the repair space.

[0076] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application.

Claims

1. A detachable digital guide for assisting fiber post and resin core restoration, characterized in that, The base guide plate and the post core guide plate are assembled by a tenon and mortise structure, and are used to assist in fiber post bonding and resin core nucleation. The base guide plate is provided with a tenon, an in-place checking window and a reinforcing rod; the tenon is arranged on the surface of the base guide plate; the in-place checking window is arranged at the abutment of the adjacent teeth on both sides of the post core restoration abutment tooth; and the reinforcing rod is arranged on the lingual side of the base guide plate. The post core guide plate is provided with a mortise, a disassembly auxiliary handle, a fiber post insertion and resin injection hole and a resin core nucleation cavity; the mortise is arranged on the surface of the post core guide plate; the disassembly auxiliary handle is arranged at the lingual end of the post core guide plate; the resin core nucleation cavity is arranged on the inner side of the post core guide plate; and the fiber post insertion and resin injection hole is arranged on the surface of the post core guide plate.

2. The detachable digital guide plate of claim 1, wherein, The tenon is a solid square retention plug structure.

3. The removable digital guide of claim 1, wherein, The base guide plate is retained by tooth support, and the range thereof extends to 1-5 adjacent teeth on both sides of the post core restoration abutment tooth.

4. The removable digital guide of claim 1, wherein, The mortise is a retention hole structure with a size and shape suitable for the tenon.

5. The removable digital guide of claim 1, wherein, The resin core nucleation cavity is designed based on the expected restoration target.

6. A method of making a removable digital guide plate as defined in claim 1, wherein, The method comprises the following steps: A. Scanning the upper and lower dental arches using a digital intraoral scanner to obtain digital impressions and models of the upper and lower dental arches; scanning the patient's head using CBCT to obtain digital impressions and models of the jaw bone and teeth; B. Based on the digital impressions and models of the upper and lower dental arches, determining the expected restoration effect and the three-dimensional shape of the target restoration, and obtaining a virtual digital diagnostic wax pattern; C. Reducing the virtual digital diagnostic wax pattern according to the required space of the restoration to obtain a virtual three-dimensional shape of the prepared abutment tooth and a digital impression and model with a resin core shape; D. Fitting and registering the virtual three-dimensional shape of the prepared abutment tooth and the digital impression and model with the resin core shape, the jaw bone and tooth structure model to design a post core guide plate; E. 3D printing a detachable digital guide plate.

7. The method of claim 6, wherein the removable digital guide is made of a material selected from the group consisting of: a thermoplastic material, a thermoset material, a metal, a ceramic, a glass, a composite material, and a combination thereof. The step B comprises: According to the principles of oral aesthetic restoration, using the facial image of the patient's smile state and the data of the upper and lower digital models to perform personalized digital aesthetic analysis and design by means of a preset tool to obtain the expected restoration effect and the three-dimensional shape of the target restoration; According to the three-dimensional shape of the target restoration, a virtual digital diagnostic wax pattern is obtained; The required space of the restoration is specifically: the incisal end restoration space is at least 1-1.5 mm, the labial surface restoration space is at least 0.8-1 mm, the lingual surface restoration space is at least 0.8-1 mm, the mesial-distal restoration space is at least 1 mm, and the convergence degree is not greater than 12°; during the reducing process of step C, if the post core positioning and forming is for a multi-unit crown abutment, the common in-place channel is considered on the basis of the conventional recommended value of the reserved crown restoration space, and the restoration space is further set; The step D further comprises, after the registration is completed, on the basis of reserving at least 4-5 mm of dental cement as a root tip seal, determining the position of the fiber post and the position of the fiber post penetrating on the resin core according to the shape of the upper root canal and the suitable post channel direction, and further determining the position of the fiber post insertion and resin injection hole.

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