Wax pattern segmented transfer guide plate and method for dental restoration and diagnosis

Abstract

The invention belongs to the technical field of dental restoration, and particularly relates to a dental restoration diagnosis wax pattern segmented transfer guide plate and a method thereof. The contour form of the guide plate is matched with the three-dimensional surface of a tooth position needing to be restored in a digital diagnosis wax pattern; the guide plate is of a double-layer structure formed by compositing a full-transparent flexible inner layer and a rigid outer layer. A buccal injection hole and a lingual injection hole which are used for injecting light-cured resin are distributed on the surface of the guide plate according to a repaired tooth position, and hole axes of the buccal injection hole and the lingual injection hole form acute angles and the like with a tooth long axis. The problem of insufficient light transmission of a traditional material is solved through the high-light-transmission double-layer structure, full-opening transfer limitation is broken through through a segmented alternate guide plate or progressive segmented repair strategy, precise demolding and occlusion supporting are achieved through the flexible / rigid composite layer, and compared with a traditional technology, the clinical precision and operation reliability are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oral restoration. More specifically, it relates to an oral restoration diagnostic wax-up segmented transfer guide plate and its method, and is particularly suitable for the precise segmented transfer of diagnostic mock-ups in the restoration of multiple or full-mouth tooth defects. Background Art

[0002] In oral restoration treatment, for the restoration of multiple or full-mouth tooth defects, it is necessary to pre-simulate the shape of the restored teeth through a diagnostic wax-up. The traditional method generates a three-dimensional model of the restoration by wax carving or digital tooth arrangement, and then manufactures a physical diagnostic wax-up through 3D printing. To ensure the feasibility of the restoration design and the patient experience, it is necessary to transfer the wax-up into the patient's mouth for try-on verification. This process is called diagnostic mock-up. In the prior art, the diagnostic mock-up is usually realized in the following way: using a silicone rubber material to replicate the diagnostic wax-up, and injecting a self-curing or light-curing resin material into the silicone rubber mold. After the resin cures in the mouth, the silicone rubber is removed to form a temporary restoration. However, the traditional method has the following significant defects: Light transmittance and curing control problems: If an opaque silicone rubber material is used, the internal resin cannot be directly cured by light, and self-curing resin needs to be relied on. Its curing time is difficult to accurately control. Premature removal of the silicone rubber is likely to cause deformation of the resin due to incomplete curing, affecting the morphological accuracy of the restoration. The light transmittance of commercially available transparent silicone rubber is insufficient (most clinically used silicone rubber is opaque, with a lower light transmittance (less than 50%). Even if transparent silicone rubber is used, the transparency is not very high (less than 80%)), resulting in low curing efficiency of the light-curing resin, and the operator cannot clearly observe the resin filling process, easily leaving air bubbles or locally unfilled areas. Material elasticity and support dependence problems: The elastic modulus of the silicone rubber material is relatively low (usually 1.5 - 3.0 MPa). When transferring in the mouth, it needs to rely on the unrepaired natural teeth or anatomical structures (such as the upper palate, mandibular lingual crest, etc.) to provide support. When the restoration scope expands (such as multiple or full-mouth restoration), the available support structures decrease, and the silicone rubber deforms due to lack of rigid support, making it difficult to accurately replicate the shape of the diagnostic wax-up. Insufficient adaptability to complex cases: For full-mouth or large-scale restorations, traditional silicone rubber guide plates need to be manufactured as a whole and transferred at one time. The operation is difficult and it is easy to cause overall deformation due to insufficient local support, making it difficult to achieve segmented precise positioning, which limits its application in complex cases. The above-mentioned defects lead to problems such as distorted prosthesis morphology, low operation efficiency, and limited clinical success rate in traditional diagnostic veneering techniques. There is an urgent need for a high-precision and high-efficiency oral restoration diagnostic wax pattern segmented transfer guide plate and its method. Summary of the Invention

[0003] In order to overcome the problems of difficult curing control caused by insufficient light transmittance, morphological distortion caused by elastic deformation of materials, limited adaptability to complex cases, and disconnection between curing parameters and clinical operations during the diagnostic veneering transfer process of traditional silicone rubber guides, therefore, the present invention provides a high-precision and high-efficiency oral restoration diagnostic wax pattern segmented transfer guide plate and its method.

[0004] The present invention specifically adopts the following technical solutions to achieve the above objectives: The present invention proposes an oral restoration diagnostic wax pattern segmented transfer guide plate, the contour morphology of the guide plate matches the three-dimensional surface of the tooth position to be restored in the digital diagnostic wax pattern, including: The guide plate is a double-layer structure composed of a fully transparent flexible inner layer and a rigid outer layer; On the surface of the guide plate, buccal injection holes and lingual injection holes for injecting light-curing resin are arranged according to the distribution of the restored tooth positions. The hole axes of the buccal injection holes and the lingual injection holes form acute angles with the tooth long axis. The guide plate is set to be single-set or multi-set. In the multi-set guide plate group, the first set of guide plates covers part of the tooth area and retains the unrepaired natural teeth as the support reference. The subsequent guide plates cover the remaining tooth area and have positioning stops at the edges that match the morphology of the cured prosthesis. The single-set guide plate covers the target restoration area and its adjacent natural tooth positioning area or all natural teeth.

[0005] As a preferred technical solution of the present invention, the elastic modulus of the flexible inner layer ≤ 10 MPa (usually 5 - 10 MPa), which is used to adapt to the tooth surface morphology and achieve damage-free demolding; The elastic modulus of the rigid outer layer ≥ 1000 MPa (usually 1000 - 3000 MPa), which is used to maintain the preset occlusal relationship and adjacent point positions of the prosthesis wax pattern.

[0006] As a preferred technical solution of the present invention, the flexible inner layer is made of polyurethane elastomer or medical polyurethane elastomer enhanced with nano-silica; The rigid outer layer is polymethyl methacrylate or hard polycarbonate with a fluorosilane coating added.

[0007] As a preferred technical solution of the present invention, the light transmittance of both the flexible inner layer and the rigid outer layer ≥ 90%.

[0008] As a preferred technical solution of the present invention, the angles formed by the axis of the buccal injection hole and the lingual injection hole and the acute angle with the long axis of the tooth are both 30°-60°; the apertures of the buccal injection hole and the lingual injection hole are both 0.5-1mm; the 30°-60° inclined injection holes arranged on the surface of the guide plate can also be designed differently according to the anatomical characteristics of the anterior teeth and the posterior teeth. The injection angle of 40°-50° and the aperture of 0.6-0.8mm in the anterior teeth area can reduce the injection pressure of thin-layer resin, and the angle of 50°-60° in the posterior teeth area combined with the aperture of 0.5-0.7mm can improve the efficiency of large-volume filling.

[0009] As a preferred technical solution of the present invention, the inner walls of the buccal injection hole and the lingual injection hole are both provided with spiral guide grooves, and the groove depth of the spiral guide grooves is 0.1-0.3 mm.

[0010] The present invention also provides a method for segmented transfer of an oral restoration diagnostic wax-up pattern, using any of the above-mentioned segmented transfer guides, comprising the following steps: I) Based on digital diagnostic wax-up data, full-arch restorations are divided into single or multiple transfer unit groups according to clinical needs; II) When dividing a single transfer unit group, a single set of guide plates is made to cover the target restoration area and the adjacent natural tooth positioning area; When there are two or more transfer unit groups, prepare a segmented guide plate group: The first set of guides retains the axial surface of the unrestored natural tooth as a three-dimensional positioning reference; The subsequent guide plate is set with an anti-rotation positioning stop at the edge that matches the edge shape of the cured restoration crown; When there are more than two transfer unit groups, a segmented guide plate group corresponding to each transfer unit group is made. The first guide plate retains the unrestored natural tooth support part, and the second guide plate is set with a positioning stop point that matches the edge of the cured restoration crown; III) When using a single set of guides, light-curing resin is injected simultaneously through the buccal and lingual injection channels to complete the restoration transfer; When multiple guide plate groups are operated in coordination, the following stages shall be followed: Phase 1: Initial positioning is achieved using the natural tooth support of the first set of guides, and the first unit group is completed by light-stereolithography through double-channel injection; The second stage: The positioning stop point of the subsequent guide plate is aligned with the edge of the cured restoration, and the dual-wavelength alternating irradiation process is used to complete the transfer of the remaining unit groups.

[0011] As a preferred technical solution of the present invention, the digital wax-up of the full-mouth restoration is divided according to the dental arch segments, and the anterior teeth segment and the posterior teeth segment are designed with split guide plates, or divided into alternating guide plate units according to the tooth position interval; When dividing the guide plate, ensure that at least one unrepaired natural tooth or cured restoration is retained between adjacent guide plate units as an in-place reference point.

[0012] As a preferred technical solution of the present invention, when using the first guide plate, elastically press the guide plate against the surface of the unrepaired dentition, and achieve three-dimensional positioning through the axial surface morphology of the untreated natural teeth; simultaneously inject the light-curing resin through the injection holes on the buccal and lingual sides, and use the spiral diversion groove to guide the resin to form a laminar flow for filling; during curing, adopt a gradient light irradiation mode, first pre-cure at a low intensity to maintain the shape, and then fully cure at a high intensity.

[0013] As a preferred technical solution of the present invention, when using the second guide plate, a groove-type positioning stop is provided at the edge of the guide plate corresponding to the edge of the crown of the cured restoration of the first guide plate; during in-place, the stop is fitted with the anatomical landmarks of the cured restoration to achieve anti-rotation positioning of the secondary guide plate; after injection, dual-wavelength alternating curing is adopted, with the 405nm wavelength curing the deep resin and the 450nm wavelength enhancing the surface crosslinking degree.

[0014] As a preferred technical solution of the present invention, when there are multiple unrepaired tooth areas, a progressive segmented repair strategy can also be adopted, including: (1) Divide the full-arch restoration into several independent repair segments; (2) Design a guide plate covering the full arch, the guide plate has an open injection channel corresponding to the current repair segment, and the remaining areas are closed and provided with positioning grooves matching the unrepaired natural teeth or cured restorations; (3) In the first stage, put the guide plate on the full arch, and use the positioning grooves in the closed area to fit with at least one unrepaired natural tooth to complete the transfer of the light-curing resin in the current open segment; (4) Replace the next guide plate, and the positioning grooves in its closed area form a composite positioning reference with the occlusal anatomical landmarks of the cured restoration in the previous stage and the axial surfaces of the adjacent natural teeth, and open a new repair segment; (5) Repeat step (4), and the cumulative error of each stage of the guide plate is ≤50μm through the progressive positioning reference transfer mechanism.

[0015] The beneficial effects of the present invention are as follows: The present invention solves the problem of insufficient light transmission of traditional materials through a high-light-transmission double-layer structure, breaks through the full-mouth transfer limit with a segmented alternating guide plate or a progressive segmented repair strategy, and the flexible / rigid composite layer realizes precise demolding and occlusal support, significantly improving the clinical accuracy and operation reliability compared with traditional technologies. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the injection hole structure at the buccal position of the guide plate of the present invention.

[0017] Figure 2 For the present inventionFigure 1 Schematic side view structure diagram of the guide plate at one tooth position.

[0018] Figure 3 Schematic structure diagram of the buccal injection hole of the present invention.

[0019] Figure 4 Structural diagram of the guide plate installed on the maxillary teeth with the unerupted upper anterior teeth as the positioning for the restoration of the upper posterior teeth.

[0020] Figure 5 For Figure 4 Structural diagram of the guide plate installed on the maxillary teeth with the upper posterior teeth after restoration by the guide plate as the positioning for the upper anterior teeth.

[0021] Figure 6 Structural diagram of the guide plate installed on the mandibular teeth with the unerupted lower anterior teeth as the positioning for the restoration of the lower posterior teeth.

[0022] Figure 7 For Figure 6 Structural diagram of the guide plate installed on the mandibular teeth with the lower posterior teeth after restoration by the guide plate as the positioning for the lower anterior teeth.

[0023] Reference numerals: 1, flexible outer layer; 2, rigid inner layer; 3, photocuring resin; 4, buccal injection hole; 5, lingual injection hole; 6, spiral backflow groove. Detailed implementation manners

[0024] Referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the present invention provides an oral restoration diagnostic wax pattern segmented transfer guide plate, the contour shape of the guide plate is precisely matched with the three-dimensional surface of the tooth position to be restored in the digital diagnostic wax pattern, including: The guide plate is a double-layer structure composed of a fully transparent flexible inner layer and a rigid outer layer; On the surface of the guide plate, buccal injection holes and lingual injection holes for injecting photocuring resin are arranged according to the distribution of the restored tooth positions, and the hole axes of the buccal injection holes and the lingual injection holes form acute angles with the tooth long axis; the guide plate is set to be single-set or multi-set. In the multi-set guide plate group, the first set of guide plate covers part of the tooth area and retains the unerupted natural teeth as the support reference, and the subsequent guide plates cover the remaining tooth area and the edges are provided with positioning stops matching the shape of the cured restoration. The single-set guide plate covers the target restoration area and its adjacent natural tooth positioning area or all natural teeth.

[0025] Among them, as a preferred technical solution of the present invention, the elastic modulus of the flexible inner layer is ≤10 MPa (usually 5-10 MPa), which is used to adapt to the tooth surface shape and achieve non-destructive demolding; The elastic modulus of the rigid outer layer is ≥ 1000 MPa (usually 1000 - 3000 MPa), which is used to maintain the preset occlusal relationship and adjacent contact point positions of the prosthetic wax pattern.

[0026] Among them, the flexible inner layer is made of polyurethane elastomer or medical polyurethane elastomer reinforced with nano-silica; The rigid outer layer is polymethyl methacrylate or hard polycarbonate with a fluorosilane coating added.

[0027] Among them, the light transmittance of both the flexible inner layer and the rigid outer layer is ≥ 90%.

[0028] Among them, the included angles between the hole axes of the buccal injection hole and the lingual injection hole and the tooth long axis are both 30° - 60°; the pore diameters of the buccal injection hole and the lingual injection hole are both 0.5 - 1 mm; the 30° - 60° inclined injection holes arranged on the surface of the guide plate can also be differentially designed according to the anatomical characteristics of anterior teeth and posterior teeth. The injection angle of 40° - 50° and the pore diameter of 0.6 - 0.8 mm in the anterior tooth area can reduce the injection pressure of the thin-layer resin, and the angle of 50° - 60° and the pore diameter of 0.5 - 0.7 mm in the posterior tooth area can improve the filling efficiency of large volumes.

[0029] Among them, spiral diversion grooves are provided on the inner walls of both the buccal injection hole and the lingual injection hole ( Figure 3 as shown), and the groove depth of the spiral diversion groove is 0.1 - 0.3 mm.

[0030] The present invention also provides an oral restoration diagnostic wax pattern segmented transfer method, which uses any one of the above-mentioned segmented transfer guide plates and includes the following steps: I) Based on the digital diagnostic wax pattern data, the full-arch restoration is divided into single or multiple transfer unit groups according to clinical requirements; II) When dividing a single transfer unit group, a single set of guide plate is made to cover the target restoration area and its adjacent natural tooth positioning area; When there are two or more transfer unit groups, a segmented guide plate group is prepared: The first set of guide plate retains the un-restored natural tooth axial surface as the three-dimensional positioning reference; The subsequent guide plates are provided with anti-rotation positioning stops at the edges that match the crown edge morphology of the cured restoration; When there are more than two transfer unit groups, a segmented guide plate group corresponding to each transfer unit group is made. The first guide plate retains the un-restored natural tooth support part, and the second guide plate is provided with a positioning stop that matches the crown edge of the cured restoration; III) When using a single set of guide plate, the light-curing resin is synchronously injected through the buccal and lingual double injection channels to complete the restoration transfer; When multiple sets of guide plate groups are operated in cooperation, it is carried out in the following stages; The first stage: Use the natural tooth support part of the first set of guides to achieve initial positioning, and complete the light-curing forming of the first unit group through dual-channel injection; The second stage: Fit the positioning stop points of the subsequent guides with the edges of the cured restorations, and use the dual-wavelength alternating irradiation process to complete the transfer of the remaining unit groups.

[0031] Among them, the digital wax pattern of the full-mouth restoration is divided according to the dental arch segments. The anterior tooth segment and the posterior tooth segment adopt a split guide design, or are divided into alternating guide units according to the tooth position interval; When dividing the guides, ensure that there is at least one unrepaired natural tooth or cured restoration between adjacent guide units as the seating reference point.

[0032] Among them, when using the first guide, elastically press the guide onto the surface of the unrepaired dentition, and achieve three-dimensional positioning through the axial surface morphology of the untreated natural teeth; synchronously inject the light-curing resin through the buccal and lingual injection holes, and use the spiral flow guide groove to guide the resin to form a laminar flow filling; when curing, adopt a gradient light irradiation mode, first pre-cure at a low intensity to maintain the shape, and then fully cure at a high intensity; Through the transparent guide, the filling situation of the resin can be clearly seen, and the resin filling status can be monitored in real time. After the resin is filled, start the light-curing lamp to complete the resin curing; Among them, when using the second guide, a groove-type positioning stop point is set at the edge of the guide corresponding to the crown edge of the cured restoration of the first guide; during seating, the stop point is fitted with the anatomical marks of the cured restoration to achieve anti-rotation positioning of the secondary guide; after injection, dual-wavelength alternating curing is adopted, the 405nm wavelength cures the deep resin, and the 450nm wavelength enhances the surface crosslinking degree.

[0033] Among them, Figures 4 - 7 As shown, when there are multiple unrepaired tooth areas, a progressive segmented repair strategy can also be adopted, including: (1) Divide the full-arch restoration into several independent repair segments; (2) Design a guide covering the full dental arch. The guide has an open injection channel corresponding to the current repair segment, and the remaining areas are closed and provided with positioning grooves matching the unrepaired natural teeth or cured restorations; (3) In the first stage, put the guide on the full dental arch, and use the positioning grooves in the closed area to fit with at least one unrepaired natural tooth to complete the transfer of the light-curing resin in the current open segment; (4) Replace the next guide, and the positioning grooves in its closed area form a composite positioning reference with the occlusal anatomical marks of the cured restoration and the axial surfaces of adjacent natural teeth in the previous stage, and open a new repair segment; (5) Repeat step (4), and the cumulative error of each stage of the guide is ≤50μm through the progressive positioning reference transfer mechanism.

[0034] The oral restoration diagnostic wax pattern segmented transfer guide plate and method proposed by the present invention achieve significant breakthroughs in accuracy, efficiency, and clinical adaptability in the field of oral restoration through the combination of a multi-layer composite structure design and an intelligent operation process; In the present invention, the guide plate adopts a composite structure of a fully transparent flexible inner layer and a rigid outer layer. The flexible inner layer is made of a polyurethane elastomer with an elastic modulus ≤ 10 MPa or a medical polyurethane elastomer reinforced with nano-silica. It can accurately fit the surface morphology of the tooth body. Its thickness design of 0.8 - 1.2 mm reduces the demolding resistance by 45% while ensuring flexibility; the rigid outer layer is polymethyl methacrylate or hard polycarbonate with an added fluorosilane coating and an elastic modulus ≥ 1000 MPa. The thickness of 1.5 - 2.0 mm and the flexural strength ≥ 80 MPa can maintain the occlusal relationship of the restoration during the curing process, and the deformation under vertical load is controlled within 20 μm, improving the accuracy by 3 times compared with the traditional single-layer guide plate; The 30° - 60° inclined injection holes provided on the surface of the guide plate in the present invention can also be designed differently according to the anatomical characteristics of the anterior teeth and posterior teeth. The injection angle of 40° - 50° and the hole diameter of 0.6 - 0.8 mm in the anterior tooth area can reduce the injection pressure of the thin-layer resin, and the angle of 50° - 60° in the posterior tooth area combined with the hole diameter of 0.5 - 0.7 mm can improve the filling efficiency of the large volume. Combined with the spiral diversion groove with a depth of 0.1 - 0.3 mm on the inner wall, the resin filling speed is increased by 35% and the bubble rate is reduced to less than 0.5% through the swirl effect, significantly reducing the blind area defect of the traditional vertical injection hole by about 15%; In the clinical operation level of the present invention, the segmented transfer method constructs a dynamic precise positioning system through the synergistic effect of digital wax pattern zoning and an alternating guide plate group; the first guide plate uses the un-restored natural tooth axial surface for three-dimensional positioning, and achieves a positioning accuracy of ±25 μm under the premise of avoiding gingival damage through an elastic pressing force of 0.5 - 1.0 N / cm²; the secondary guide plate can also adopt a groove-type positioning stop design to connect with the main guide plate to avoid displacement; the dual-wavelength alternating curing process deep-cures with a 405 nm wavelength (120 mW / cm²) and surface-strengthens with a 450 nm wavelength (180 mW / cm²), making the deep crosslinking degree of the restoration > 90% and the surface hardness reach 20 HV. Combined with the 0.5 mm adjustable layer formed by pre-curing with 80 mW / cm² in the gradient light mode, a fine adjustment with an occlusal surface morphology error < 50 μm is achieved; this method supports the phased transfer of the full-arch restoration. Through the gradient thickness design of the 3 - 5 mm overlapping buffer zone and the alternating guide plate division with a 2 - 3 tooth position interval, the problem of multi-guide plate collaborative positioning is solved. Clinical data shows that the seating accuracy of the full-mouth restoration is improved by 37% and the operation time is shortened to within 18 minutes; Compared with traditional technologies, the composite guide plate structure of the present invention enables a light transmittance ≥ 90% and a haze ≤ 3%, and the light energy utilization rate is increased to 92%. Combined with the optical property of a birefringence < 0.005, it effectively avoids the problem of uneven curing caused by light scattering. The nano-silica reinforcing material enables the tear strength of the flexible layer to reach 8 MPa. Combined with the antibacterial rate of the fluorosilane coating > 99%, the reuse times of the guide plate exceed 50 times, significantly reducing the single-case repair cost by 40%. Clinical comparisons show that this technology improves the resin filling integrity from 90% - 90% of traditional guide plates to 98% - 99%, and reduces the occlusal surface morphology error from 120 - 150 μm to below 50 μm. At the same time, through the elastic crimping design and precise occlusal reconstruction, the postoperative sensitivity rate of patients is decreased by 60% and the chewing efficiency reaches 95% of natural teeth. The integration of these technical advantages forms a technical barrier centered on a 30° - 60° injection angle, spiral diversion channels, double elastic modulus layers, and dual-wavelength curing, constructing a full-process precision control system from digital design to physical restoration, providing an innovative solution for complex oral restoration cases. For complex cases with multiple unrepaired teeth, a progressive segmented repair strategy can also be adopted: First, divide the full-arch restoration into several sections based on the digital diagnostic wax-up data, design a guide plate covering all tooth areas, but only open the single tooth area to be repaired currently (the remaining areas are closed as positioning references). After the first unrepaired tooth area completes the light-cured resin transfer through the guide plate, remove this guide plate and replace it with a second set of guide plates. The new guide plate uses the occlusal surface morphology of the previous restoration and the axial surface of natural teeth as composite positioning references, accurately fit it onto the full arch, and then open the next tooth area to be repaired. By repeating this process - that is, only dealing with a single unrepaired area at each stage, and the subsequent guide plates always inherit the anatomical landmarks of the previously repaired areas as positioning bases - finally achieve the precise step-by-step repair of all sections of the full arch. This solution ensures that the cumulative error in multi-stage operations is controlled within 50 μm through a progressive positioning reference transfer mechanism, and at the same time avoids the problem of guide plate deformation caused by insufficient support structure in traditional methods.

[0035] The following is the core comparison between the technology of the present invention and traditional background technologies:

[0036] The present invention solves the problem of insufficient light transmission of traditional materials through a high-light-transmission double-layer structure, breaks through the full-mouth transfer limitation with segmented alternating guide plates or a progressive segmented repair strategy, and the flexible / rigid composite layer realizes precise demolding and occlusal support, significantly improving the clinical accuracy and operation reliability compared with traditional technologies.

[0037] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oral restoration diagnostic wax pattern segmented transfer guide plate, characterized in that: The contour of the guide plate matches the three-dimensional surface of the tooth position to be restored in the digital diagnostic wax-up, including: The guide plate is a double-layer structure composed of a fully transparent flexible inner layer and a rigid outer layer; On the surface of the guide plate, buccal injection holes and lingual injection holes for injecting light-curing resin are arranged according to the distribution of the tooth positions to be restored. The hole axes of the buccal injection holes and the lingual injection holes form acute angles with the tooth long axis.

2. The sectional transfer guide plate for oral restoration diagnostic wax pattern according to claim 1, characterized in that: The elastic modulus of the flexible inner layer is ≤10 MPa, which is used to adapt to the surface morphology of the tooth body and achieve damage-free demolding; The elastic modulus of the rigid outer layer is ≥1000 MPa, which is used to maintain the preset occlusal relationship and the position of the adjacent contact points of the restoration wax-up.

3. The sectional transfer guide plate and method for oral restoration diagnostic wax pattern according to claim 1, characterized in that: The flexible inner layer is a medical polyurethane elastomer reinforced with nano-silica; The rigid outer layer is polycarbonate with a fluorosilane coating added.

4. The sectional transfer guide plate for oral restoration diagnostic wax pattern according to claim 1, wherein: The light transmittance of both the flexible inner layer and the rigid outer layer is ≥90%; 5. The sectional transfer guide plate for oral restoration diagnostic wax pattern according to claim 1, wherein: The included angles between the hole axes of the buccal injection holes and the lingual injection holes and the tooth long axis are both 30°-60°; the diameters of the buccal injection holes and the lingual injection holes are both 0.5-1 mm.

6. The sectional transfer guide plate for oral rehabilitation diagnostic wax pattern according to claim 1, characterized in that: Spiral diversion grooves are arranged on the inner walls of the buccal injection holes and the lingual injection holes, and the groove depth of the spiral diversion grooves is 0.1-0.3 mm.

7. An oral rehabilitation diagnostic wax pattern segmented transfer method, characterized in that: Using the sectional transfer guide plate according to any one of claims 1-6, the following steps are included: Ⅰ) Based on the digital diagnostic wax-up data, the full-arch restoration is divided into single or multiple transfer unit groups according to clinical requirements; Ⅱ) When dividing a single transfer unit group, a single set of guide plate is made to cover the target restoration area and its adjacent natural tooth positioning area; When there are two or more transfer unit groups, a sectional guide plate group is prepared: The first set of guide plate retains the axial surface of the unrepaired natural tooth as a three-dimensional positioning reference; Anti-rotation positioning stops matching the crown edge morphology of the cured restoration are arranged at the edges of the subsequent guide plates; Ⅲ) When using a single set of guide plate, the light-curing resin is injected synchronously through the buccal and lingual double injection channels to complete the transfer of the restoration; When multiple sets of guide plate groups are operated in cooperation, the following is carried out in stages; The first stage: The initial positioning is realized by using the natural tooth support part of the first set of guide plate, and the light-curing molding of the first unit group is completed through double-channel injection; The second stage: The positioning stops of the subsequent guide plates are fitted with the edges of the cured restoration, and the remaining unit groups are transferred by using the double-wavelength alternating irradiation process.

8. A sectional transfer guide plate for oral restoration diagnostic wax patterns according to claim 1, characterized in that: When there are multiple unrepaired tooth areas, a progressive sectional restoration strategy can also be adopted, including: (1) Divide the full-arch restoration into several independent restoration sections; (2) Design a guide plate covering the full arch. The guide plate opens injection channels corresponding to the current restoration section, and the remaining areas are closed and provided with positioning grooves matching the unrepaired natural teeth or the cured restoration; (3) In the first stage, the guide plate is sleeved on the full arch, and the positioning grooves in the closed area are fitted with at least one unrepaired natural tooth to complete the transfer of the light-curing resin in the current open section; (4) Replace the next guide plate. The positioning grooves in its closed area form a composite positioning reference with the occlusal anatomical landmarks of the cured restoration in the previous stage and the axial surfaces of the adjacent natural teeth, and a new restoration section is opened; (5) Repeat step (4).

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