A digitalized anterior tooth clasp type dual-retention adhesive fixed denture

Abstract

The utility model discloses a kind of digitalization front tooth card holds type double-retention adhesive fixed denture, specifically related to oral cavity aesthetic prosthetic technology field, including bridge for repairing missing tooth of patient and two sides integrally formed for retention labial veneer retention body and adjacent lingual surface card holds type elastic wing plate, the labial veneer retention body is located in the labial side of abutment of missing tooth site of patient two sides, the adjacent lingual surface card holds type elastic wing plate is located in the lingual surface of abutment of missing tooth site of patient two sides, the labial veneer retention body is provided with veneer retention body tissue face near one side of abutment, the veneer retention body tissue face and abutment labial side are adhered, the adjacent lingual surface card holds type elastic wing plate is provided with lingual wing plate tissue face near one side of abutment, the utility model, provide main adhesive retention force by labial veneer retention body, and the card holds force and part adhesive force generated by adjacent lingual surface card holds type elastic wing plate into reverse recess, realize the synergistic effect of double-retention.

Description

Technical Field

[0001] This utility model relates to the field of oral aesthetic restoration technology, specifically a digital anterior tooth clasp-type double-retention adhesive fixed denture. Background Technology

[0002] Tooth loss is a common condition in oral clinics, referring to the loss of one or more teeth in the maxillary or mandibular dentition due to caries, periodontal disease, trauma, or congenital developmental abnormalities, while a varying number of natural teeth remain. This condition not only affects the patient's chewing function, dental aesthetics, and speech clarity, but can also lead to tilting of adjacent teeth, elongation of opposing teeth, malocclusion, and even temporomandibular joint symptoms, severely impacting the patient's oral health and quality of life.

[0003] Currently, conventional restorative methods for missing teeth mainly include removable partial dentures, implant-supported dentures, and fixed partial dentures. Removable partial dentures rely on clasps and a base for retention, allowing patients to remove and insert them themselves. While simple to manufacture and relatively inexpensive, their base covers a large area, often leading to a noticeable foreign body sensation, affecting comfort and speech; exposed metal clasps also affect aesthetics; long-term use may also result in denture deformation, damage, and decreased chewing efficiency due to reduced retention. Implant-supported dentures, on the other hand, involve implanting an artificial tooth root into the alveolar bone in the edentulous area and then mounting a prosthesis on it, achieving a good restoration of chewing function and aesthetics without damaging adjacent teeth, and are considered one of the ideal restorative methods. However, implant treatment is lengthy, often taking several months from implant placement to completion; implant surgery has strict requirements regarding the patient's alveolar bone volume, bone quality, and overall health (such as whether they have uncontrolled diabetes); furthermore, some patients have a fear of surgery, and the high cost also limits its application.

[0004] Fixed partial dentures are another important type of restoration. Their basic structure includes abutments, pons, and connectors. The abutments are fixed to the abutment teeth, and their main functions are to provide retention and stability for the denture and protect the abutment teeth. The pons restores the shape and function of the missing tooth. The connectors connect the abutments and pons, and transmit and distribute occlusal forces. Clinically, fixed partial dentures mainly include full-crown fixed bridges and bonded fixed bridges. Full-crown fixed bridges use the natural teeth on both sides of the edentulous area as abutment teeth, connecting the pons through full-crown abutments to form a unified restorative structure. This method offers high chewing efficiency and comfort, but requires grinding down 1.0-2.0 mm or even more of tooth structure from each surface of the abutment teeth. This process is irreversible and may weaken the structural strength of the abutment teeth, increasing the risk of postoperative pulpitis. Furthermore, food debris and plaque easily accumulate in the contact area between the gingival end of the pons and adjacent teeth. If oral hygiene is not maintained properly, secondary caries and periodontitis can occur in the abutment teeth. Adhesive fixed bridges, or simply adhesive bridges, have advantages such as good aesthetics, less tooth removal, short fabrication time, high patient comfort, and lower cost. Therefore, they are often used as transitional restorations for missing anterior teeth to quickly restore the aesthetics and some function of the anterior teeth area.

[0005] However, traditional anterior bonded bridges also have several significant drawbacks in clinical application. First, their retention is relatively insufficient. Because retention relies solely on the lingual alar plate, and the bonding area is limited, the adhesive is prone to aging and dissolution under long-term chewing forces, leading to detachment of the restoration. If detachment is not addressed promptly, saliva and microorganisms can seep into the space between the alar plate and the tooth surface, causing secondary caries in the abutment tooth. Second, patient comfort can still be improved. To ensure sufficient bonding area and retention, the lingual alar plate in traditional designs often cannot be too thin or small, which may interfere with tongue movement, affecting pronunciation and chewing. Some patients experience a significant foreign body sensation, and even occlusal interference. Third, traditional bonded bridges have not yet achieved truly minimally invasive or non-invasive restoration. A small amount of tooth preparation is still required on the lingual side of the abutment tooth before restoration. If the lingual surface morphology of the abutment tooth is unfavorable for alar plate placement (e.g., too flat or insufficiently convex), additional mechanical retention features such as post holes and grooves are required, further increasing the amount of tooth tissue removed, thus deviating from the original intention of minimally invasive restoration. Finally, its indications are quite strict. The wing plate can usually only be placed near the lingual protuberance of the abutment tooth. For patients with deep overbite and deep overjet, the mandibular anterior teeth are prone to interfering with the lingual wing plate of the maxillary abutment tooth during occlusion. Extensive grinding of tooth structure or the wing plate is often required to obtain sufficient space; otherwise, this restorative method cannot be used, limiting its clinical application. Therefore, we propose a digital anterior clasp-type double-retention cemented fixed prosthesis to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a digital anterior clasp-type double-retention adhesive fixed denture to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a digital anterior clasp-type double-retention cemented fixed denture, comprising a bridge for restoring a patient's missing teeth and two integrally formed labial veneer retainers and proximal lingual clasp-type elastic wing plates for retention. The labial veneer retainers are located on the labial side of the abutment teeth on both sides of the patient's missing tooth site. The proximal lingual clasp-type elastic wing plates are located on the lingual side of the abutment teeth on both sides of the patient's missing tooth site. The side of the labial veneer retainer adjacent to the abutment teeth is designated as the veneer retainer tissue surface, and the veneer retainer tissue surface is bonded to the labial side of the abutment teeth. The side of the proximal lingual clasp-type elastic wing plate adjacent to the abutment teeth is designated as the lingual wing plate tissue surface, and the lingual wing plate tissue surface is bonded to the proximal lingual side of the abutment teeth. When the patient bites, the area where the lingual surface of the abutment teeth on both sides of the patient's missing tooth site contacts the opposing teeth is the abutment tooth occlusal contact area, and the rest is the non-occlusal contact area.

[0008] Preferably, the thickness of both the lip-side contact retainer and the adjacent tongue-side clamping elastic wing plate is set to 1-1.5 mm.

[0009] Preferably, the tongue portion of the adjacent tongue-mounted elastic wing plate should avoid the occlusal contact area of ​​the abutment teeth by at least 1.0 mm.

[0010] Preferably, for patients with normal occlusion, the tongue portion of the adjacent lingual elastic wing plate preferentially covers the non-occlusal contact area of ​​the entire lingual protuberance, and the gingival end can be level with the gingiva or more than 0.5 mm from the gingival margin.

[0011] Preferably, for patients with deep overbite and deep overjet, the lingual portion of the adjacent lingual clasp elastic wing plate can cover the non-occlusal contact area near the incisal edge, with the incisal edge avoiding the incisal edge of the abutment tooth by more than 1 mm.

[0012] Preferably, for patients with severe deep overbite, the range of the adjacent lingual occlusal elastic wing plate can be reduced to the lingual angle near the occlusal gap.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Significantly enhanced retention force: The main adhesive retention force is provided by the lip-side retainer, and combined with the clamping force generated by the adjacent tongue-side clamping elastic wing plate entering the undercut and part of the adhesive force, a synergistic effect of dual retention is achieved; 2. Improved patient comfort: Since the main fixation force is located on the labial side, the adjacent lingual elastic wing plate only plays an auxiliary fixation role. Therefore, its area can be significantly reduced, and can even be reduced to the adjacent lingual axis angle near the gap side, which effectively avoids occlusal interference and the impact on tongue movement, thus improving wearing comfort. 3. Achieve minimally invasive and non-invasive restoration: The restoration process does not require tooth preparation or the preparation of mechanical retention structures such as pin holes. Especially for patients with deep overbite and deep overjet, traditional bonded fixed dentures are limited by the fact that the wing plate must be placed near the lingual protuberance or require a lot of tooth grinding. This fixed denture can set the adjacent lingual surface snap-fit ​​elastic wing plate in the non-occlusal contact area of ​​the proximal incisal edge, perfectly adapting to their occlusal characteristics and greatly expanding clinical applicability. 4. Added aesthetic value: For patients with poor labial surface morphology or color of adjacent teeth, the labial veneer retainers of this fixed denture can be restored at the same time, restoring the missing teeth while achieving the aesthetic harmony of the overall dentition. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the labial side view of the adhesive-fixed denture of this utility model.

[0016] Figure 2 This is a lingual side view of the adhesive fixed denture of this utility model (from left to right: the maximum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual carina, the minimum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual carina, and the maximum expansion of the adjacent lingual surface retaining elastic wing plate near the incisal edge).

[0017] Figure 3 This is a schematic diagram of the mesiodistal cross-section of the adhesive fixed denture of this utility model (from left to right: the maximum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual cartilage, the minimum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual cartilage, and the maximum expansion of the adjacent lingual surface retaining elastic wing plate near the incisal edge).

[0018] Figure 4 This is a schematic diagram of the incisal edge of the adhesive fixed denture of this utility model (from left to right: the maximum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual cartilage, the minimum expansion of the adjacent lingual surface retaining elastic wing plate at the lingual cartilage, and the maximum expansion of the adjacent lingual surface retaining elastic wing plate near the incisal edge).

[0019] In the diagram: 1. Bridge body; 2. Labial veneer retainer; 3. Proximal lingual clasp-type flexible wing plate; 4. Tissue surface of the veneer retainer; 5. Tissue surface of the lingual wing plate; 6. Occlusal contact area of ​​the abutment tooth. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example: Figure 1-4 As shown, this utility model provides a digital anterior tooth retainer-type double-retention cemented fixed prosthesis, including a bridge body 1 for restoring the patient's missing teeth, labial veneer retainers 2 integrally formed on both sides for retention, and a specially designed lingual retainer-type elastic wing plate 3. The bridge body 1, labial veneer retainers 2 and specially designed lingual retainer-type elastic wing plate 3 constitute the prosthesis. Among them, the bridge body 1, the lip-side cladding retainer 2 and the adjacent tongue-side clamping elastic wing plate 3 are made of elastic resin-based materials. They are digitally designed based on oral scanning digital imprinting and manufactured by mechanical cutting or 3D printing. Alternatively, they can be made by molding and then pouring a plaster model on the working model and then manufacturing it using traditional glue filling process. To ensure the overall structural strength, the thickness of the lip-side cladding retainer 2 and the adjacent tongue-side clamping elastic wing plate 3 is set to 1-1.5mm. The labial veneer retainer 2 is located on the labial side of the abutment teeth on both sides of the missing tooth site. The adjacent lingual elastic wing plate 3 is located on the lingual side of the abutment teeth on both sides of the missing tooth site. The side of the labial veneer retainer 2 adjacent to the abutment teeth is set as the veneer retainer tissue surface 4. The veneer retainer tissue surface 4 is bonded to the labial side of the abutment teeth by resin adhesive. The side of the adjacent lingual elastic wing plate 3 adjacent to the abutment teeth is set as the lingual wing plate tissue surface 5. The lingual wing plate tissue surface 5 is bonded to the adjacent lingual side of the abutment teeth by resin adhesive. By using the labial veneer retainer 2 and the specially designed adjacent lingual clasp-type elastic wing plate 3, a dual retention mechanism of bonding and clasping is achieved, which significantly enhances the bonding force, restraint force and friction force of the denture to the patient's abutment teeth, and obtains retention force far superior to that of traditional bonded fixed dentures.

[0022] The above design avoids the tooth preparation required for traditional fixed or bonded fixed dentures, enabling non-invasive restoration, making the restoration process reversible, and improving the safety of the restoration.

[0023] When the patient bites, the area where the lingual surface of the abutment teeth on both sides of the missing tooth site contacts the opposing tooth is the abutment tooth occlusal contact area 6, and the rest is the non-occlusal contact area; the lingual surface portion of the adjacent lingual surface retaining elastic wing plate 3 must avoid the abutment tooth occlusal contact area 6 by at least 1.0 mm. For patients with normal occlusion, the lingual portion of the adjacent lingual elastic wing plate 3 should preferentially cover the non-occlusal contact area of ​​the entire lingual protuberance, and the gingival tip can be level with the gingiva or more than 0.5 mm away from the gingival margin; for patients with deep overbite and deep overjet, the lingual portion of the adjacent lingual elastic wing plate 3 can cover the non-occlusal contact area near the incisal edge, and the incisal tip should avoid the incisal edge of the abutment tooth by more than 1 mm. Among them, the area of ​​the lingual occlusal elastic wing plate 3 can be appropriately reduced according to the individual variation of occlusal contact, and the non-occlusal contact area of ​​the lingual surface of the abutment tooth can be flexibly used to cover and retain the tooth. For patients with severe deep overbite and deep overjet, the range of the lingual occlusal elastic wing plate 3 can be reduced to the lingual angle near the gap side, and retention can be obtained by relying solely on the occlusion and cementation of the proximal surface.

[0024] Working principle: When using the clasp-type double-retention cemented denture, the missing tooth can be any one or more of the incisors and lateral incisors. The teeth on both sides of the missing tooth are selected as abutment teeth, and no preparation is required on the labial or lingual surfaces. The prosthesis material is selected from elastic resin-based materials. It is digitally designed based on oral scanning digital impression and manufactured by mechanical cutting or 3D printing process. Alternatively, a plaster model can be poured after the impression is made. The prosthesis is then made on the working model using traditional glue filling process. To ensure the overall structural strength, the thickness of the lip-side veneer retainer 2 and the adjacent tongue-side clamping elastic wing plate 3 is set to 1-1.5mm. After the restoration is fabricated, adhesive is applied to the surface of the abutment tooth, and adhesive is also applied to the tissue surface 4 of the veneer retainer and the tissue surface 5 of the lingual wing plate. The restoration is then positioned from the incisal edge to the gingival edge. Once the adhesive has cured, the anterior bonded bridge restoration is complete.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital anterior clasp-type double-retention cemented fixed prosthesis, comprising a bridge (1) for restoring a patient's missing teeth, labial veneer retainers (2) integrally formed on both sides for retention, and a lingual clasp-type elastic wing plate (3), characterized in that: The labial veneer retainer (2) is located on the labial side of the abutment teeth on both sides of the patient's missing tooth site. The adjacent lingual elastic wing plate (3) is located on the lingual side of the abutment teeth on both sides of the patient's missing tooth site. The side of the labial veneer retainer (2) adjacent to the abutment teeth is set as the veneer retainer tissue surface (4). The veneer retainer tissue surface (4) is bonded to the labial side of the abutment teeth. The side of the adjacent lingual elastic wing plate (3) adjacent to the abutment teeth is set as the lingual wing plate tissue surface (5). The lingual wing plate tissue surface (5) is bonded to the adjacent lingual side of the abutment teeth. When the patient bites, the area where the lingual surface of the abutment teeth on both sides of the patient's missing tooth site contacts the opposing teeth is the abutment tooth occlusal contact area (6), and the rest is the non-occlusal contact area.

2. The digital anterior clasp-type double-retention adhesive fixed denture according to claim 1, characterized in that: The thickness of the lip-side adhesive retainer (2) and the adjacent tongue-side clamping elastic wing plate (3) is set to 1-1.5 mm.

3. The digital anterior clasp-type double-retention adhesive fixed denture according to claim 1, characterized in that: The tongue portion of the adjacent tongue-mounted elastic wing plate (3) must avoid the occlusal contact area (6) of the abutment tooth by at least 1.0 mm.

4. The digital anterior clasp-type double-retention adhesive fixed denture according to claim 1, characterized in that: For patients with normal occlusion, the tongue side of the adjacent tongue-mounted elastic wing plate (3) preferentially covers the non-occlusal contact area of ​​the entire tongue protuberance, and the gingival end can be level with the gingiva or more than 0.5 mm away from the gingival margin.

5. A digital anterior clasp-type double-retention adhesive fixed denture according to claim 1, characterized in that: For patients with deep overbite and deep overjet, the lingual portion of the adjacent lingual elastic wing plate (3) can cover the non-occlusal contact area near the incisal edge, with the incisal edge avoiding the incisal edge of the abutment tooth by more than 1 mm.

6. A digital anterior clasp-type double-retention adhesive fixed denture according to claim 1, characterized in that: For patients with severe deep overbite and deep overjet, the range of the adjacent lingual elastic wing plate (3) can be reduced to the lingual angle near the occlusal side of the gap.

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