Tooth adjacent face neck root double-forming and isolating system and application method

Abstract

The invention relates to the field of tooth and pulp pathology, and discloses an isolation and double-forming system for tooth proximal neck and root defect repair treatment, which is matched with a rubber barrier clip for tooth proximal neck and root defect repair treatment to obtain a good moisture isolation condition and leakproofness during proximal neck and root defect filling repair. The double-forming and isolating system is used for treating tooth adjacent face neck root defects. The problem that an existing adjacent face forming system and an existing rubber barrier system are difficult to form, closely attach and isolate during tooth adjacent face neck root treatment is solved, the sealing performance of filling treatment is improved, meanwhile, the shape recovery effect of the adjacent face and the neck root can be guaranteed, and the practical application value is achieved.

Description

Technical Field

[0001] The invention belongs to the field of endodontics and relates to a tooth proximal surface neck root double shaping and isolation system and an application method. Background Art

[0002] In endodontics, proximal cervical root defects, especially deep and large caries involving the proximal cervical root of molars, have always been a difficult and important task to treat. In clinical practice, the distal proximal cervical root defect of the second molar caused by mesial impaction of wisdom teeth is even more difficult. Due to the extremely high difficulty of repair, it is the direct cause of tooth extraction.

[0003] In the existing filling treatment of proximal tooth defects, it is usually necessary to use a forming sheet system to limit the filling and repair area to facilitate the filling and repair materials, restore the tooth shape, and form a continuous edge to prevent the occurrence of overhangs. At the same time, in order to ensure the strength of tooth bonding, a rubber dam isolation system is used in conjunction to provide a good field of view and moisture-proof environment for filling treatment. However, for proximal tooth cervical root defects, when the defect is located below the gingiva or on the bone surface, the anatomical morphology and position of the defect area are special. The existing forming system and isolation system cannot help the filling treatment form a close gingival wall edge, a good shape and a moisture-proof bonding environment, and the treatment difficulty and risk of failure are high. This is because, on the one hand, wedges and forming sheets often cannot reach the defect area and achieve the purpose of tightly fitting the root of the tooth neck, resulting in poor restoration of the appearance of the filling treatment and the appearance of overhangs or gaps; on the other hand, the existing rubber dam isolation system cannot be used to isolate the subgingival proximal root of the tooth neck. During treatment, there are problems such as poor vision, interference from blood and gingival sulcus fluid, etc., which lead to improper operation and isolation, and ultimately problems such as microleakage, secondary caries and filling shedding.

[0004] At present, for the filling treatment of the defects of the proximal cervical root of teeth, gingival wall lifting can be considered. Gingival wall lifting is first performed by trimming the existing proximal shaping sheet under the conditions of hemostasis and relative moisture isolation of cotton balls, and then the gingival wall of the tooth defect located below the gingiva or on the bone surface is restored to the supragingival, and then the supragingival defect is repaired in combination with rubber dam. However, this method cannot guarantee the moisture isolation condition of the subgingival part, so its bonding effect cannot be guaranteed. In addition, this method cannot guarantee the close fit and continuity of the shape, and requires a lot of chairside time for fine adjustment. The technical sensitivity is extremely high, so it is difficult to meet the needs of daily clinical treatment. Some domestic scholars have also tried to complete the repair of proximal defects by making personalized 3D printed shaping sheets, but this method is complicated to operate and requires a lot of technical and equipment support. It not only increases the workload of doctors, but also increases the number of visits for patients. It cannot be widely promoted at present.

[0005] For direct bonding and restorative treatment of proximal cervical root defects of teeth, the shortcomings of the existing technology mainly come from two aspects: on the one hand, because the defect is deep and the special anatomical structure of the proximal cervical root makes it impossible for the existing shaping system to be closely attached to the proximal cervical root of the tooth and close the defect section, thereby failing to effectively restore the shape of the tooth; on the other hand, the existing rubber dam clamp and the shaping system fixing device cannot be used on a tooth at the same time, and they hinder each other's operation, that is, the existing shaping device is difficult to combine with the rubber dam isolation technique, resulting in the inability to obtain the necessary moist environment in the surgical area during the restorative treatment, thereby failing to obtain effective bonding strength, which directly affects the quality of the filling.

[0006] At present, some researchers have studied the proximal surface shaping system for the proximal cervical root defects of molars. For example, the utility model patent CN215384763U discloses a proximal surface shaping system for repairing the proximal cervical root defects of molars. However, due to the particularity of the position of the affected teeth, there are few proximal surface shaping systems that can cooperate with rubber dams to completely isolate moisture in the current research results to establish a good moisture-proof working area environment, or it takes a lot of time to make personalized designs. These problems limit the wide application and effectiveness of these methods. Summary of the invention

[0007] The present invention aims to explore a shaping system that has the potential for popularization and can be used in conjunction with a rubber dam to tightly seal deep defects at the root of the proximal neck. This new proximal shaping system can effectively solve the current problems in the treatment and restoration of deep and large defects at the root of the proximal neck of teeth, and improve the feasibility and treatment quality of direct bonding restoration of molar proximal neck root defects. The present invention further explores the specific application of this new shaping system, provides more references and assistance for dental treatment, and provides a new, efficient, and highly adaptable solution for the oral field, thereby bringing practical benefits to the majority of patients.

[0008] In endodontics, the treatment of proximal cervical root defects is an important and difficult task. Due to the particularity of the defect location, the existing shaping system has limitations because it cannot effectively restore the tooth shape and obtain marginal tightness. The existing rubber dam isolation system cannot be applied to the moisture isolation of subgingival proximal cervical root defects. In order to solve the above technical problems, the present invention designs a double shaping system for the proximal cervical root of teeth, and cooperates with a special rubber dam clamp for the repair and treatment of proximal cervical root defects of teeth to obtain good moisture isolation conditions and airtightness when filling and repairing proximal cervical root defects, as well as a smooth and close-fitting filling body shape. It solves the problem that the existing proximal shaping system and rubber dam system are difficult to shape, seal and isolate when treating the proximal cervical root of teeth. While improving the airtightness of the filling treatment, it can also ensure the effect of morphological restoration of the proximal surface and cervical root.

[0009] The present invention adopts the following technical solutions:

[0010] A tooth proximal cervical root double shaping and isolation system comprises a rubber dam clamp, a fixing and adjusting locking device, a ring-shaped primary shaping sheet, and a shaping sheet.

[0011] Preferably, the rubber dam clip is a wingless clip, one side of the rubber dam clip is a bridge-shaped beak, and the top of the bridge-shaped beak is designed as a U-shaped bridge-shaped hollow structure, which can be fixed on the neck of the tooth or on the connecting rod of the fixed locking device. The rubber dam clip and the fixed locking device do not interfere with each other and can be placed on the same tooth at the same time.

[0012] Preferably, both ends of the fixed lock device are provided with tunnel-type slots and shaft-type cam side thrust clamps, and the two ends are connected by a connecting rod. The shaft-type cam side thrust clamp is clamped by a lock and a wrench.

[0013] Preferably, the tunnel-type slot allows the annular primary forming sheet to pass through, and the inner diameter of the annular primary forming sheet is adjusted by turning the wrench of the shaft-type cam side-thrust clamp. The annular primary forming sheet and the fixed locking device form an adjustable isolation ring; the adjustable isolation ring has a smooth appearance, which facilitates the rubber dam cloth to be put on from top to bottom.

[0014] Preferably, the annular primary forming sheet is a long strip of metal sheet that is narrow at both ends and wide in the middle; the size of the annular primary forming sheet is designed according to the size of different molars, preferably with a length range of 2cm-5cm, a width range of 0.02mm-0.50mm, and a height range of 0.15-0.8cm.

[0015] Preferably, a plurality of concave-convex groove structures are designed at the narrower ends of the annular primary forming sheet, and an arc-shaped heightened structure is designed in the middle of the annular primary forming sheet to cover the deep defect at the root of the tooth neck. The concave-convex groove structures at the two ends match the fixed and adjustable locking device for locking retention, and the end protrusions are thickened for easy clamping. The two ends of the annular primary forming sheet can be passed through the tunnel-type slot of the fixed and adjustable locking device to form a ring shape. The tightness is adjusted by adjusting the wrench of the fixed and adjustable locking device and the tunnel-type slot of the fixed and adjustable locking device. The lock is loosened when the wrench is in the loosened position, and the lock is pressed and fixed when the wrench is in the clamped position. By adjusting the tightness of the fixed locking device, the size and tightness of the annular primary forming sheet are adjusted to form an adjustable isolation ring suitable for the size of the tooth neck.

[0016] Preferably, the size of the shaping sheet is in the range of 0.5 cm to 2 cm in length, 0.02 mm to 0.2 mm in width, and 0.5 to 1 cm in height.

[0017] Preferably, the shaping sheet is an arc shape conforming to the tooth shape, and its subgingival part is a double-layer structure with a downward arc and an inner layer of the subgingival part having a wedge-shaped rubber pad with a thickness of 0.01-0.5 mm. The lower end of the wedge-shaped rubber pad is thicker, and the upper section gradually becomes thinner and moves to the middle of the shaping sheet to ensure a continuous shape during filling treatment. The shaping sheet is inserted between the adjustable isolation ring and the defect at the root of the neck, with the inner layer with the wedge-shaped rubber pad facing the gingival wall position of the defect area. By tightening the adjustable isolation ring, the wedge-shaped rubber pad of the shaping sheet is pressed by force, adapting to the irregular gingival wall shape, and closely fitting with the edge of the gingival wall of the defect area. Even if the shape of the root of the neck is irregular, a close and closed environment can be formed, which is convenient for shape restoration and direct bonding repair.

[0018] The application method of the tooth proximal cervical root dual shaping and isolation system is as follows:

[0019] (1) Select a suitable type of annular primary shaping sheet according to the size of the affected tooth, insert the concave-convex groove structures at both ends of the annular primary shaping sheet into the tunnel-type card slot of the fixed locking device, surround the affected tooth, and place the arc-shaped heightening structure of the annular primary shaping sheet below the defective gingival wall at the root of the adjacent neck;

[0020] (2) By clamping the thickened protrusions at the tail of the concave-convex groove structure at both ends of the annular primary forming piece, tighten the annular primary forming piece and then turn the wrench of the fixed adjustment lock device to lock and fix the annular primary forming piece. Make the lower edge of the annular primary forming piece fit closely with the tooth root to form an adjustable isolation ring at the root of the adjacent neck;

[0021] (3) Loosen the wrench on the defect side of the adjustable isolation ring, place the shaping sheet with a wedge-shaped rubber pad on the gingival wall end between the adjustable isolation ring and the defect at the root of the adjacent neck, tighten the adjustable isolation ring again, so that the shaping sheet is completely in close contact with the gingival wall of the hole; confirm the moisture-proof effect and stability of the isolation ring under a microscope;

[0022] (4) Put the rubber cloth with holes on the neck of the tooth and the outside of the adjustable isolation ring to expose the tooth to be treated and the adjustable isolation ring. Fix the rubber dam clamp on the neck of the tooth, with its bridge beak above the connecting rod of the fixed locking device of the adjustable isolation ring, and confirm that the rubber dam cloth is in place and the upper bow;

[0023] (5) After confirming that the gingival wall is in close contact with the shaping sheet under a microscope, the cavity is cleaned and dried, and the resin direct bonding restoration is performed according to the conventional process. The appearance and tightness of the restoration are evaluated using a microscope and taking immediate periapical radiographs after surgery.

[0024] The present invention has adopted three key measures:

[0025] First, a double shaping system for the proximal cervical root of teeth is designed, which includes an annular primary shaping piece for the proximal cervical root of teeth, a shaping piece with a closed wedge-shaped rubber pad on the inner layer, and a fixed adjustment locking device. After the annular primary shaping piece is tightened, the wedge-shaped rubber pad on the inner layer of the shaping piece is deformed by force, adapts to the irregular shape of the tooth neck, and seals the gingival wall closely, thus achieving the final shaping range and microenvironment isolation of the proximal surface and proximal cervical root of teeth, strictly limiting the three-dimensional filling range of the filling material, and providing a basis for the close fit and shaping of the filling treatment of the proximal surface and proximal cervical root of teeth;

[0026] Secondly, a rubber dam clip is designed to cooperate with the repair and treatment of proximal cervical root defects. After the application of this specially designed rubber dam clip, the rubber dam system can also be smoothly placed after the proximal cervical root forming system is applied. The two do not interfere with each other and can be placed on the same tooth at the same time. The isolation of the proximal cervical root of the tooth and the moist environment of the oral cavity is achieved, so that good moisture isolation conditions and airtightness are obtained when filling and repairing proximal cervical root defects;

[0027] Third, a method for treating tooth proximal cervical root defects by using a double shaping and isolation system for tooth proximal cervical root. This method first uses a primary annular shaping sheet for tooth proximal cervical root to preliminarily delineate the repair range of the proximal cervical root defect of the proximal tooth, forming an adjustable isolation ring for the proximal cervical root, and then places a shaping sheet with a wedge-shaped rubber pad at the gingival wall end in the defect area. By fixing and adjusting the tightness of the locking device, the elastic wedge-shaped rubber pad on the inner layer of the gingival wall of the shaping sheet conforms to the shape of the tooth neck and completely adheres to and seals the gingival wall, thereby achieving the final shaping range and microenvironment isolation of the proximal surface and tooth proximal cervical root in the area to be repaired. Finally, after the rubber cloth is placed in place using the rubber cloth priority method, a specially designed special rubber dam clamp is used to fix the rubber dam cloth and completely isolate the tooth to be treated.

[0028] Compared with the prior art, the present invention has an easier-to-use shaping sheet and a rubber dam that is easier to put in place, thus solving the problems of high sensitivity of the restoration technology, moisture isolation and filling body shaping. The tooth proximal cervical root double shaping and isolation system of the present invention solves the problem that the existing proximal shaping system is difficult to isolate from moisture and seal, while also ensuring the effect of restoring the morphology of the proximal cervical root. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 : Schematic diagram of a dual forming and isolation system according to an embodiment of the present invention;

[0030] Figure 2 : Schematic diagram of the rubber dam clamp of the embodiment;

[0031] Figure 3 : Schematic diagram of the locking end of the fixed and adjustable locking device of the embodiment;

[0032] Figure 4 : Schematic diagram of the annular primary forming sheet of the embodiment;

[0033] Figure 5 : Schematic diagram of the shaping sheet of the embodiment;

[0034] Among them, the figure marks 1: rubber dam clamp, 2: fixed adjustment locking device, 3: annular primary forming piece, 4: shaping forming piece, 5: rubber dam clamp bridge-type beak, 6: tunnel-type slot, 7: locking end, 8: wrench release position, 9: wrench, 10: wrench clamping position, 11: concave-convex groove structure of the annular primary forming piece, 12: arc-shaped heightening structure of the annular primary forming piece, 13: wedge-shaped rubber pad of the shaping forming piece, 14: connecting rod. DETAILED DESCRIPTION

[0035] In order to more clearly explain the purpose, technical solutions and advantages of the present invention, the following will be described in detail with reference to the accompanying drawings and specific embodiments. The accompanying drawings show only exemplary embodiments of the present invention and are not intended to limit its implementation. The present invention can be implemented in various forms, and its design concept and core technology are not limited by the embodiments shown in the accompanying drawings. The purpose of providing these embodiments is to make it easier for technicians to understand the principles, structures and functions of the present invention, so as to better grasp and apply its technical solutions. The terms used in this specification are only used to describe specific embodiments and do not constitute a limitation on the present invention.

[0036] Embodiment 1:

[0037] like Figure 1-Figure 5 As shown, a double shaping and isolation system for the adjacent cervical root of a tooth comprises a rubber dam clamp 1, a fixing and adjusting locking device, a ring-shaped primary shaping sheet 3, and a shaping sheet 4.

[0038] Both ends of the fixed lock device 2 are lock ends 7, which are connected by a connecting rod 14. The lock ends 7 are provided with a tunnel-type slot 6 and an axle-type cam side thrust fixture. The axle-type cam side thrust fixture is clamped by a wrench 9.

[0039] The tunnel-type card slot 6 allows the annular primary forming piece 3 to pass through, and the inner diameter of the annular primary forming piece is adjusted by turning the wrench 9. The annular primary forming piece 3 and the fixed locking device 2 form an adjustable isolation ring; the overall shape of the adjustable isolation ring is smooth, which is convenient for the rubber dam cloth to be put on from top to bottom.

[0040] The two ends of the annular primary forming piece 3 are provided with a concave-convex groove structure 11 and an arc-shaped heightening structure 12, and the end is designed as a convex thickening structure. The concave-convex groove structure 11 at the two ends of the annular primary forming piece 3 matches the shaft-type cam side-thrusting clamp of the fixed adjustment locking device, and the two ends of the annular primary forming piece 3 can be passed through the tunnel-type card slot 6 of the fixed adjustment locking device, and the expansion and contraction of the shaft-type cam side-thrusting clamp inside the locking end 7 is controlled by adjusting the wrench 9 of the fixed adjustment locking device, so that the two ends of the annular primary forming piece 3 in the tunnel-type card slot 6 are pressed and fixed, and the lock 7 is released when the wrench 9 is in the wrench release position 8, and the lock end 7 is pressed and fixed when the wrench is in the wrench clamping position 10. The arc-shaped heightening structure 12 of the annular primary forming piece is designed into different models in the mesial and distal according to the depth of the defect. When the annular primary forming piece 3 surrounds the affected tooth, the arc-shaped heightening structure 12 can cover and surround the defective gingival side of the adjacent neck root of the affected tooth to form a primary closure.

[0041] The subgingival part of the shaping sheet 4 is a double-layer structure, and the inner layer has a wedge-shaped rubber pad 13, which is placed on the defective gingival side, and the tightness of the annular primary shaping sheet 3 is adjusted. The wedge-shaped rubber pad 13 adapts to the defect shape of the cervical root. This part is specially designed for teeth with a concave structure or irregular shape at the cervical root. The wedge-shaped rubber pad 13 structure can adaptively fit the irregular defect edge to form a good appearance and complete the final closed shaping.

[0042] One side of the rubber dam clamp 1 is a bridge-shaped beak 5; the top of the bridge-shaped beak 5 is designed as a U-shaped bridge-like hollow structure. The hollow structure allows 5 to be fixed on the tooth neck surrounded by the annular primary forming sheet 3 while being supported on the connecting rod 14 of the fixed adjustment locking device, thereby achieving the purpose of simultaneous application of the rubber dam clamp and the forming system without interfering with each other.

[0043] During use, first select a suitable annular primary shaping sheet 3 according to the size of the affected tooth and the position of the defect, pass the concave-convex groove structures 11 at both ends of the annular primary shaping sheet 3 through the tunnel-type slots 6 of the fixed adjustment locking device 2, and move the convex thickened parts at the ends of the clamp 3 to the specific position of 3, so that the arc-shaped heightening structure 12 of the annular primary shaping sheet 3 covers the gingival defect at the root of the adjacent neck, and adjust the wrench 9 of the fixed adjustment locking device to fix the annular primary shaping sheet 3, forming an adjustable isolation ring around the neck of the tooth, and completing the primary closure of the root of the neck. On this basis, place the shaping sheet 4 between the annular primary shaping sheet 3 and the defect at the root of the affected tooth neck, and adjust the wrench 9 of the fixed adjustment locking device 2 to control the tightness of the annular primary shaping sheet 3, and then pressurize the wedge-shaped rubber pad 13 of the shaping sheet 4 to make it completely close to the defective cavity wall. Next, put the rubber cloth with holes on the outside of the adjustable isolation ring formed by the annular primary forming piece 3 at the tooth neck and the fixed adjustment locking device 2, so that the tooth to be treated can be exposed and the fixed adjustment locking device 2 can be seen. Then fix the rubber dam clamp 1 to the tooth neck, and the rubber dam clamp bridge-type beak 5 is placed on the connecting rod 14. Confirm that the rubber dam cloth has been put in place, and then confirm the moisture-proof effect and stability under a microscope. Finally, after confirming under a microscope that the gingival wall of the defect at the root of the adjacent neck is in close contact with the shaping piece 4, dry the cavity, and then perform direct resin bonding repair according to the conventional process. A microscope can be used to take periapical X-rays immediately after surgery to evaluate the appearance and tightness of the restoration.

[0044] Finally, we need to emphasize that the embodiments provided here are only part of the embodiments of the present invention, not all of them. Based on the present invention, all other embodiments obtained by technicians in this field without creative work should fall within the scope of protection of the present invention. In general, the new dual shaping and isolation system in this study has brought significant improvements to the treatment of posterior tooth proximal cervical root defects through innovative design and highly adaptable use, and has good application prospects.

Claims

1. A tooth proximal cervical root dual shaping and isolation system, characterized in that: It includes a rubber dam clamp, a fixed and adjustable locking device, an annular primary forming piece, and a shaping forming piece; the annular primary forming piece is located on the outside of the shaping forming piece; the concave and convex groove structures located at both ends of the annular primary forming piece match the fixed and adjustable locking device for locking retention; by adjusting the tightness of the fixed locking device, the size and tightness of the annular primary forming piece are adjusted to form an adjustable isolation ring suitable for the size of the tooth neck.

2. The tooth proximal cervical root dual shaping and isolation system according to claim 1, characterized in that: The rubber dam clamp is a wingless clamp, one side of the rubber dam clamp is a bridge-shaped beak, and the top of the bridge-shaped beak is designed as a U-shaped bridge-shaped hollow structure.

3. The tooth proximal cervical root dual shaping and isolation system according to claim 1, characterized in that: Both ends of the fixed locking device are provided with tunnel-type slots and shaft-type cam side-thrust clamps, and the two ends are connected by a connecting rod. The shaft-type cam side-thrust clamp is clamped by a locking buckle and a wrench.

4. The tooth proximal cervical root dual shaping and isolation system according to claim 1, characterized in that: The annular primary forming sheet is a long strip of metal sheet narrow at both ends and wide in the middle, with multiple concave-convex groove structures designed at both ends and an arc-shaped heightening structure designed in the middle to cover the deep defect at the root of the tooth neck.

5. The tooth proximal cervical root dual shaping and isolation system according to claim 4, characterized in that: The length of the annular primary forming sheet ranges from 2 cm to 5 cm, the width ranges from 0.02 mm to 0.50 mm, and the height ranges from 0.15 to 0.8 cm.

6. The tooth proximal cervical root dual shaping and isolation system according to claim 4, characterized in that: The shaping sheet is an arc shape conforming to the shape of the teeth, and its subgingival part is a double-layer structure with a downward arc. The inner layer has an adaptive wedge-shaped rubber pad with a thickness of 0.01-0.5mm. The lower end of the wedge-shaped rubber pad is thicker, and the upper section gradually becomes thinner and moves to the middle of the shaping sheet.

7. The tooth proximal cervical root dual shaping and isolation system according to claim 1, characterized in that: The end of the annular primary forming sheet is arranged to be convex and thickened to facilitate clamping.

8. The tooth proximal cervical root dual shaping and isolation system according to claim 7, characterized in that: The length of the shaping sheet is in the range of 0.5 cm to 2 cm, the width is in the range of 0.02 mm to 0.2 mm, and the height is in the range of 0.5 to 1 cm.

9. The tooth proximal cervical root dual shaping and isolation system according to claim 7, characterized in that: The shaping sheet is inserted between the adjustable isolation ring and the defect at the root of the tooth neck, with the side with the wedge-shaped rubber pad facing the gingival wall of the defect area. By tightening the adjustable isolation ring, the wedge-shaped rubber pad of the shaping sheet is pressed tightly to adapt to the irregular shape of the defect area and tightly fit the edge of the gingival wall to form a closed environment.

10. The application method of the tooth proximal cervical root dual shaping and isolation system according to any one of claims 1 to 9, characterized in that: The specific steps include: (1) Select a suitable type of annular primary shaping sheet according to the size of the affected tooth, insert the concave and convex groove structures at both ends into the tunnel-type card slot of the fixed locking device, surround the affected tooth, and place the arc-shaped heightening structure of the annular primary shaping sheet below the defective gingival wall at the root of the adjacent neck; (2) By clamping the thickened raised parts at the tail of the concave-convex groove structure at both ends of the annular primary forming piece, tightening the annular primary forming piece and then turning the wrench of the fixed adjustment lock device to lock and fix the annular primary forming piece; making the lower edge of the annular primary forming piece closely attached to the tooth root to form an adjustable isolation ring at the proximal cervical root; (3) Loosen the adjustable isolation ring, place the shaping sheet with a wedge-shaped rubber pad on the gingival wall end between the adjustable isolation ring and the defect at the root of the adjacent neck, and tighten the adjustable isolation ring again to make the shaping sheet completely fit the gingival wall of the hole; (4) Put the rubber cloth with holes on the tooth neck and the outside of the adjustable isolation ring to expose the tooth to be treated and the adjustable isolation ring, and fix the rubber dam clamp on the tooth neck. The U-shaped hollow structure of the bridge beak is above the connecting rod of the fixed locking device of the adjustable isolation ring. The rubber dam clamp and the forming system can be used at the same time without interfering with each other. After confirming that the rubber dam cloth is in place, arch the upper part; (5) The cavity is cleaned and dried, and repaired with direct bonding of composite resin.

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