Clamp for removing porcelain dental crown

Abstract

A clamp for removing a baked porcelain dental crown belongs to the field of dental baked porcelain dental crown dismounting devices and comprises two nut fixing seats, two bolts, a rigid frame and two bonding curing materials, the rigid frame is of a U-shaped structure, and the two ends of a top cross beam of the rigid frame are bent downwards at right angles to form a left frame vertical edge and a right frame vertical edge which are in mirror symmetry; a horizontally through small screw hole is formed in an outer side arm at the lower end of the vertical edge of the frame; the nut fixing seat comprises a gasket seat plate and a nut; the nut is vertically and fixedly connected to the center of the end surface of one side wall of the gasket seat plate; the nut fixing seat is fixed on the side wall end surface of the root part of the outer side wall of the bionic porcelain dental crown by the bonding and curing material; the top cross beam stretches across the upper part of the bionic porcelain dental crown; the bolt penetrates through the small screw hole from outside to inside and is fixedly connected with the nut in a threaded mode. According to the utility model, a prerequisite condition is created for smooth and complete removal and low-cost secondary utilization of the bionic porcelain dental crown, and a foundation is laid for a high-efficiency and low-cost treatment scheme for root canal treatment of the bionic porcelain dental crown.

Description

Technical Field

[0001] The utility model belongs to the field of dental porcelain fused crown disassembly devices, and particularly relates to a fixture for removing porcelain fused crowns. Background Technique

[0002] As Figure 1 shown, the structure of a healthy molar mainly includes the self-grown enamel crown 1, cementum 2, and dental pulp 3, where the dental pulp 3 is located inside the midline segment of the cementum 2; the enamel crown 1 covers and is fixedly connected to the top of the upper segment of the cementum 2. When a molar is severely damaged due to factors such as caries and cannot be treated by filling, but the activity of the dental nerve canal can still be retained, usually the "full crown treatment plan" as Figure 2 and Figure 3 shown is adopted for treatment, that is: completely removing the self-grown enamel crown 1 with a crown remover, and moderately grinding and cutting the top of the healthy cementum 2 to form a frustum 2-1 for docking the porcelain fused crown on the top of the cementum 2. At the same time, a bionic porcelain fused crown 4 replacing the enamel crown 1 is made by using imaging and three-dimensional manufacturing technologies. Finally, the conical groove 4-1 at the bottom of the bionic porcelain fused crown 4 is buckled and fixedly connected with the frustum 2-1 at the top of the cementum 2, thereby completing the replacement treatment of the carious enamel crown 1 and further protecting the still healthy dental nerve canal. However, as Figure 4 shown, after the "full crown treatment", bacteria will breed in the joint gap C between the inner side wall 4-1-1 of the conical groove at the bottom of the porcelain fused crown and the outer side wall 2-1-1 of the root of the cementum frustum over time, resulting in the formation of caries again near the joint gap C of the porcelain fused tooth and finally causing the carious cavity to penetrate laterally through the cementum 2 to reach the dental pulp 3, thereby causing pulpitis. At this time, the nerve activity of the dental pulp 3 cannot be preserved, and only radical nerve-killing treatment, that is, root canal treatment, can be performed on this carious tooth.

[0003] For the situation where root canal treatment is required due to the recurrence of caries at the root of the aforementioned bionic porcelain fused crown 4, there are three conventional solutions:

[0004] Solution 1: Try to tap the root of the outer side wall 4-2-1 of the bionic porcelain fused crown with a special crown remover in the dental department, and make the porcelain fused crown loosen by applying an impact external force;

[0005] Solution 2: Use a special dental drill in the dental department to directly drill a vertical hole in the center of the bionic porcelain fused crown 4, destroy the upper surface of the bionic porcelain fused crown 4 and expose the dental pulp 3. After completing the root canal treatment of killing the dental nerve, then use dental filling materials to seal the drilled hole at the top of the bionic porcelain fused crown 4;

[0006] Solution 3: Use dental tools such as turbine grinding to destructively remove the bionic porcelain crown 4. After completing the root canal treatment to kill the dental nerve, use another pre-made porcelain crown to reinstall it on the affected part of the tooth to complete the replacement of the porcelain crown.

[0007] However, porcelain crowns made of fine materials and well-made often have a very precise, smooth and seamless porcelain contour surface 4-2. In the process of using the aforementioned solution 1, the crown remover usually cannot find the appropriate point of force, causing difficulty in operation, and even slipping and causing accidental damage to the patient's mouth. The aforementioned solution 2 will cause structural damage to the original bionic porcelain crown, which will greatly reduce its service life. Moreover, porcelain crowns made of some materials are prone to porcelain collapse during the drilling process, resulting in sharp spikes, which will affect the patient's long-term use and even cause the porcelain crown to be directly scrapped. Solution 3, which destructively removes the bionic porcelain tooth, requires the additional production of a second new porcelain crown for replacement, which significantly increases the patient's time and economic costs. Utility Model Content

[0008] In order to solve the technical problems that the side wall curved surface of the existing porcelain crown is smooth and seamless, the crown remover usually cannot find the appropriate fulcrum; the porcelain root canal treatment program that uses dental tools such as dental drills and crown removers to destructively remove the bionic porcelain crown will cause structural damage to the original bionic porcelain crown and greatly reduce its service life; moreover, porcelain crowns of some materials are prone to porcelain chipping during the drilling process, resulting in sharp spikes, which affects the long-term use of patients and even causes the porcelain crown to be directly scrapped; and the technical problems that a second new porcelain crown for replacement needs to be made, which consumes a lot of time and generates additional expensive costs, the utility model provides a clamp for removing porcelain crowns.

[0009] The technical solution adopted by the utility model to solve the technical problem is as follows:

[0010] A fixture for removing a porcelain crown, characterized in that: the fixture comprises two nut fixing seats, two bolts, a rigid frame and two pieces of adhesive curing materials, the rigid frame is a U-shaped structure, the two ends of the top crossbeam of the rigid frame are respectively bent downward at right angles to form two left and right vertical sides of the frame that are mirror-symmetrical to each other; a small screw hole that runs horizontally through is provided on the outer arm at the lower end of the vertical side of the frame; the nut fixing seat comprises a gasket seat plate and a nut, and the nut is vertically fixed to the center of a side wall end face of the gasket seat plate; the adhesive curing material fixes the nut fixing seat on the side wall end face at the root of the outer side wall of the bionic porcelain crown in a bonding and curing manner; the top crossbeam spans over the top of the bionic porcelain crown; the bolts pass through the corresponding small screw holes from the outside to the inside and are fixed to the corresponding nut threads.

[0011] The other side wall end surface of the gasket seat plate is provided with an anti-slip stripe structure; the length of the bolt ranges from 2mm to 4mm.

[0012] The above gasket seat plate can be bent into an arc shape adapted to the root of the outer wall of the bionic porcelain crown.

[0013] The above gasket seat plate presses indentations on the outer surface of the adhesive curing material that are exactly the same as the contour shape and size of the gasket seat plate, and corresponding indentation grooves are formed after the adhesive curing material is cured; or the gasket seat plate is bonded to the root of the outer wall of the bionic porcelain crown through the adhesive curing material before the adhesive curing material is completely cured, and the front and rear end faces of the gasket seat plate are completely buried inside the adhesive curing material, and only the nut is exposed outside the adhesive curing material.

[0014] After the above nut fixing seat is fixedly connected to the side wall end face of the root of the outer wall of the bionic porcelain crown by the adhesive curing material, the structural strength of the connection between the nut fixing seat and the bionic porcelain crown is greater than the structural strength value of the connection between the bionic porcelain crown and the conical platform at the top of the cementum.

[0015] The above frame vertical side is a rigid thin plate, and its thickness range is 2 mm to 3 mm; the length L2 of the top cross beam is 102% of the width value L1 from the lingual side to the buccal side of the bionic porcelain crown.

[0016] The beneficial effect of the present utility model is that the fixture for removing the porcelain crown uses a well-known photo-curing composite resin adhesive material in the dental field as a plastic auxiliary base that can adhere to the smooth outer wall of the bionic porcelain crown, so as to reliably fix and attach the nut to the buccal side and lingual side of the bionic porcelain crown.

[0017] The rigid frame with a U-shaped structure has both ends of its top cross beam bent downward at right angles to form left and right frame vertical sides that are mirror-symmetrical to each other; this structural design enables the top cross beam to span over the bionic porcelain crown from the lingual side to the buccal side, and the frame vertical sides on its left and right sides are respectively connected to the nut rotating shafts attached to both sides of the bionic porcelain crown through corresponding bolts. When the bolts are further tightened, the threaded connection between the bolts and the nuts together constitutes a lead screw mechanism, and pushes the corresponding frame vertical sides on both sides of the bionic porcelain crown to approach each other, thereby reliably clamping the bionic porcelain crown in the fixture of the present invention.

[0018] The gasket seat plate on the nut fixing seat and the anti-slip stripe structure on its back are both used to expand the attachment area when the root of the nut fits on the outer wall of the bionic porcelain crown. The light-curing composite resin adhesive material can be used in both surface bonding and complete embedding methods to reliably fix the gasket seat plate and the root of the nut, thus ensuring the firmness of the whole fixture when clamping on the outer wall of the bionic porcelain crown. The bottom ends of the two vertical sides of the frame serve as the striking force points, perfectly solving the inherent problem that the traditional crown remover cannot attach and apply force on the smooth side wall of the bionic porcelain crown, thus creating a prerequisite for the smooth and complete removal and low-cost secondary utilization of the bionic porcelain crown, and laying a foundation for the efficient and low-cost treatment plan for the root canal treatment of the bionic porcelain crown.

[0019] In addition, the fixture for removing the porcelain crown has the advantages of simple and practical structure, convenient operation, low cost, and easy popularization. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the main structure of a healthy molar;

[0021] Figure 2 is a schematic diagram of the principle when processing the top of the cementum and making a bionic porcelain crown after removing the enamel crown under the full crown treatment plan;

[0022] Figure 3 is Figure 2 a schematic diagram of the final result of the full crown treatment plan after the bionic porcelain crown is fixedly connected to the processed top of the cementum in

[0023] Figure 4 is Figure 3 a partial enlarged view of part I in

[0024] Figure 5 is a three-dimensional view of the fixture for removing the porcelain crown of the present invention without the bonding and curing material;

[0025] Figure 6 is Figure 5 an exploded view mounting diagram of

[0026] Figure 7 is a three-dimensional structure schematic diagram when two nut fixing seats of the present invention are placed opposite to each other;

[0027] Figure 8 is a side view of the nut fixing seat of the present invention;

[0028] Figure 9 is Figure 5 a front view of

[0029] Figure 10It is an application schematic diagram when respectively pasting the nut fixing seat and the bonding and curing material of the present invention on both sides of the preliminary bionic porcelain fused to metal crown correspondingly;

[0030] Figure 11 It is a schematic principle diagram when the front and rear end faces of the gasket seat plate are completely buried by using the bonding and curing material of the present invention and only the nut is left exposed;

[0031] Figure 12 It is a three-dimensional view of the fixture for removing the porcelain fused to metal crown of the present invention when only bonding and fixing the end face of the anti-slip stripe structure behind the gasket seat plate with the bonding and curing material;

[0032] Figure 13 It is an application schematic diagram of the fixture for removing the porcelain fused to metal crown of the present invention;

[0033] Figure 14 It is Figure 13 The partial enlarged view of part II in Specific embodiments

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As Figures 5 to 9 shown, the fixture for removing the porcelain fused to metal crown of the present invention includes two nut fixing seats 5, two bolts 6, a rigid frame 7 and two pieces of bonding and curing material 8. The rigid frame 7 is of a U-shaped structure, and both ends of its top cross beam 7-1 are bent downward at right angles to form two left and right frame vertical sides 7-2 that are mirror-symmetrical to each other; a horizontally penetrating small screw hole 7-2-1 is provided on the outer side arm at the lower end of the frame vertical side 7-2; the nut fixing seat 5 includes a gasket seat plate 5-1 and a nut 5-2, and the nut 5-2 is vertically fixed at the center of one side wall end face of the gasket seat plate 5-1; the bonding and curing material 8 fixes the nut fixing seat 5 on the side wall end face at the root 4-2-1 of the outer side wall of the bionic porcelain fused to metal crown in a bonding and curing manner; the top cross beam 7-1 straddles above the bionic porcelain fused to metal crown 4; the bolt 6 passes through the corresponding small screw hole 7-2-1 from the outside to the inside and is threadedly fixed to the corresponding nut 5-2.

[0036] An anti-slip stripe structure 5-3 is provided on the other side wall end face of the gasket seat plate 5-1; the length range of the bolt 6 is 2 mm to 4 mm. The gasket seat plate 5-1 can be bent into an arc shape adapted to the root 4-2-1 of the outer side wall of the bionic porcelain fused to metal crown.

[0037] The gasket seat plate 5-1 presses indentations on the outer surface of the bonding and curing material 8 that are exactly the same as the contour shape and size of the gasket seat plate 5-1, and corresponding indentation grooves are formed after the bonding and curing material 8 is cured; or the gasket seat plate 5-1 is bonded to the root 4-2-1 of the outer side wall of the bionic porcelain crown through the bonding and curing material 8 before the bonding and curing material 8 is completely cured, and the front and rear end faces of the gasket seat plate 5-1 are completely buried inside the bonding and curing material 8, and only the nut 5-2 is exposed outside the bonding and curing material 8.

[0038] After the nut fixing seat 5 is fixedly connected to the side wall end face of the root 4-2-1 of the outer side wall of the bionic porcelain crown by the bonding and curing material 8, the structural strength of the connection between the nut fixing seat 5 and the bionic porcelain crown 4 is greater than the structural strength value of the connection between the bionic porcelain crown 4 and the conical table 2-1 at the top of the cementum.

[0039] The vertical side 7-2 of the frame is a rigid thin plate, and its thickness range is 2 mm to 3 mm; the length L2 of the top cross beam 7-1 is 102% of the width value L1 from the lingual side to the buccal side of the bionic porcelain crown 4.

[0040] When specifically applying the fixture for removing the porcelain crown of the present invention, as Figures 10 to 14 shown, multiple sets of rigid frames 7 with different lengths are made according to a gradient difference of 2 mm, and the average value of the length of the top cross beam 7-1 is 5 mm. When specifically applying, according to the actual measured value of the patient's age and the corresponding width value L1 from the lingual side to the buccal side of the bionic porcelain crown 4, the length L2 of the matching top cross beam 7-1 is selected, and the bonding and curing material 8 is selected as a light-curing composite resin adhesive.

[0041] During use, a piece of bonding and curing material 8 is pasted on the lingual side of the bionic porcelain crown 4 to be removed, and the bonding and curing material 8 is piled up to 4 mm to 5 mm. Then, the end face of the anti-slip stripe structure 5-3 of a nut fixing seat 5 is pressed into the bonding and curing material 8 and is bent conformally to fit on the outer end face of the lingual side of the root of the bionic porcelain crown 4. Then, the bonding and curing material 8 is subjected to a photochemical reaction and cured by ultraviolet light irradiation. After that, the other side of the nut fixing seat 5 is covered with additional bonding and curing material 8 until the nut fixing seat 5 is completely buried in the bonding and curing material 8, and only the nut 5-2 is exposed outside the bonding and curing material 8. Then, the additional bonding and curing material 8 is subjected to light curing.

[0042] Using the same method as described above, another nut fixing seat 5 is fixed on the outer end surface of the oral buccal side at the root of the bionic porcelain crown 4. Then, a bolt 6 passes through the corresponding small screw holes 7-2-1 from the outside to the inside and is threadedly connected to the corresponding nut 5-2, so that the top cross beam 7-1 spans over the bionic porcelain crown 4 in the direction from the oral lingual side to the buccal side, and the frame vertical edges 7-2 on its left and right sides are respectively rotationally connected to the nut fixing seats 5 on the lingual side and the buccal side of the bionic porcelain crown 4 through the bolt 6. When the bolt 6 is further tightened, the threaded connection between the bolt 6 and the nut 5-2 together constitutes a lead screw mechanism, and pushes the corresponding frame vertical edges 7-2 on both sides of the bionic porcelain crown 4 to approach each other, thereby clamping the bionic porcelain crown 4.

[0043] As Figure 14 shown, after the adhesive curing material 8 is cured and reaches the curing strength, a dental crown remover tool can be used to alternately strike the bottoms of the frame vertical edges 7-2 on both sides of the bionic porcelain crown 4. The impact force generated by the striking is sequentially transmitted through the frame vertical edges 7-2, bolts 6, nuts 5-2, gasket seat plates 5-1, and the solidified adhesive curing material 8, and finally acts on the outer periphery of the roots on both sides of the bionic porcelain crown 4, thereby solving the problem of applying the striking force on the smooth side wall of the bionic porcelain crown 4, and finally realizing the complete and undamaged detachment of the bionic porcelain crown 4 from the cementum 2 on the lateral carious surface.

Claims

1. A fixture for removing a porcelain crown, characterized in that: The fixture includes two nut fixing seats (5), two bolts (6), a rigid frame (7), and two pieces of adhesive curing material (8). The rigid frame (7) has a U-shaped structure, and both ends of its top cross beam (7-1) are bent downward at right angles to form two left and right frame vertical sides (7-2) that are mirror-symmetrical to each other. A horizontally penetrating small screw hole (7-2-1) is provided on the outer side arm at the lower end of the frame vertical side (7-2). The nut fixing seat (5) includes a gasket seat plate (5-1) and a nut (5-2), and the nut (5-2) is vertically fixed to the center of one side wall end face of the gasket seat plate (5-1). The adhesive curing material (8) fixes the nut fixing seat (5) to the side wall end face at the root of the outer side wall of the bionic porcelain crown (4-2-1) in a bonding and curing manner. The top cross beam (7-1) spans over the bionic porcelain crown (4). The bolt (6) passes through the corresponding small screw hole (7-2-1) from the outside to the inside and is threadedly fixed to the corresponding nut (5-2).

2. The jig for removing a porcelain fused to metal crown according to claim 1, wherein: An anti-slip stripe structure (5-3) is provided on the other side wall end face of the gasket seat plate (5-1). The length range of the bolt (6) is 2 mm to 4 mm.

3. The fixture for removing a porcelain fused to metal crown according to claim 2, characterized in that: The gasket seat plate (5-1) can be bent into an arc shape adapted to the root of the outer side wall of the bionic porcelain crown (4-2-1).

4. The fixture for removing a porcelain fused to metal crown according to claim 2, characterized in that: The gasket seat plate (5-1) presses out indentations on the outer surface of the adhesive curing material (8) that are exactly the same as the contour shape and size of the gasket seat plate (5-1), and corresponding indentation grooves are formed after the adhesive curing material (8) is cured; or the gasket seat plate (5-1) is bonded to the root of the outer side wall of the bionic porcelain crown (4-2-1) through the adhesive curing material (8) before the adhesive curing material (8) is completely cured, and both the front and rear end faces of the gasket seat plate (5-1) are completely buried inside the adhesive curing material (8), with only the nut (5-2) exposed outside the adhesive curing material (8).

5. The fixture for removing a porcelain fused to metal crown according to claim 2, wherein: After the nut fixing seat (5) is fixed to the side wall end face at the root of the outer side wall of the bionic porcelain crown (4-2-1) by the adhesive curing material (8), the structural strength of the connection between the nut fixing seat (5) and the bionic porcelain crown (4) is greater than the structural strength value of the connection between the bionic porcelain crown (4) and the conical table (2-1) at the top of the cementum.

6. The fixture for removing a porcelain fused to metal crown according to claim 2, characterized in that: The frame vertical side (7-2) is a rigid thin plate, and its thickness range is 2 mm to 3 mm. The length L2 of the top cross beam (7-1) is 102% of the width value L1 from the lingual side to the buccal side of the bionic porcelain crown (4).

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