Composite ceramic material for restoration of preformed crowns in children

Abstract

The utility model discloses a child composite ceramic material repair preformed crown relates to preformed crown technical field, the utility model discloses a dental crown body, the hollow preformed cavity is formed in the dental crown body, the preformed cavity is cooperated with the tooth body, the middle portion of dental crown body top surface is concave downward, the outer wall of dental crown body is equipped with the protective layer, the utility model discloses a preformed crown of installing on the tooth body is formed by the cooperation of dental crown body and protective layer, and the adhesive composite of dental crown body of ceramic material and the protective layer of resin material selects the multiple of color, and the good degree of beauty is good, and through the occlusal concave of protective layer in dental crown body top surface concave formation, can be through the protective layer and carry out the repair of preformed crown, and the doctor need not change the tooth and use habit, and the foreign body sensation is smaller, will not have the influence to the dentition development and the jaw bone development of infant patient.

Description

Technical Field

[0001] This utility model relates to the field of preformed crown technology, specifically to the repair of preformed crowns using composite ceramic materials for children. Background Technology

[0002] Currently, stainless steel preformed crowns are commonly used for children's primary teeth and young permanent teeth, with zirconia preformed crowns used in a smaller number of cases. However, stainless steel has poor aesthetics, requiring trimming and bending of the edges, which can lead to excessive trimming and rough edges. Glass ionomer cement is commonly used for bonding, requiring light curing, but stainless steel is opaque, resulting in poor bonding strength and a tendency to detach. Zirconia crowns, due to their high strength, cannot be easily adjusted by dentists; tooth preparation must be done according to the crown's shape, leading to prolonged intraoral procedures and extensive preparation, often extending below the gum line. This is difficult due to children's low cooperation. Furthermore, zirconia preformed crowns have a high elastic modulus, which can cause enamel hypoplasia in primary teeth or young permanent teeth, resulting in significant wear on opposing and adjacent teeth and potentially causing occlusal problems. This can negatively impact children's dentition and jaw development. Therefore, we propose using composite ceramic materials for preformed crown restoration in children. Utility Model Content

[0003] The purpose of this utility model is to solve the problems mentioned in the background art above, and to provide a pre-formed crown repaired with composite ceramic material for children.

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0005] A pre-formed crown for children's composite ceramic restoration includes a crown body with a hollow pre-formed cavity formed within it. The pre-formed cavity fits into the tooth body. The center of the top surface of the crown body is concave downwards. A protective layer is provided on the outer wall of the crown body. The protective layer forms an occlusal recess at the concave part of the top surface of the crown body. The crown body is made of ceramic material, and the protective layer is made of resin material. The crown body and the protective layer are bonded together.

[0006] Furthermore, a micro-protrusion positioning stage is formed on the outer wall of the crown body, and the micro-protrusion positioning stage cooperates with the protective layer.

[0007] Furthermore, the outer wall of the crown body is also formed with micro-recessed positioning grooves, and the protective layer fills the micro-recessed positioning grooves.

[0008] Furthermore, the crown of the crown body has a recessed connecting groove, and a connector is provided in the connecting groove for connecting the tooth body.

[0009] Furthermore, the inner diameter of the connecting groove is larger than the outer diameter of the top of the connector, the top surface of the connector is slightly higher than the bottom surface of the connecting groove, and the protective layer fills the connecting groove and covers the top of the connector.

[0010] Furthermore, a countersunk platform is formed on the top of the preformed cavity, which is used to sink into the top surface of the tooth.

[0011] Furthermore, the inner wall of the preformed cavity is provided with a transition layer, which is used for bonding and fixing the crown body to the tooth body.

[0012] Furthermore, a shoulder is formed at the bottom end of the crown body, the shoulder is used for the overflow of the transition layer, and the overflow portion of the transition layer is connected to the protective layer at the shoulder.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model forms a preformed crown installed on the tooth by combining the crown body and the protective layer. The crown body is made of ceramic material and the protective layer is made of resin material and bonded together. It has a variety of colors to choose from and good aesthetics. The protective layer is recessed on the top surface of the crown body to form an occlusal recess, which can be used to shape the preformed crown. Doctors do not need to change their tooth preparation and usage habits. It has less foreign body sensation, less wear on the opposing teeth and adjacent teeth, or even no wear. It will not affect the development of the dentition and jawbone of young patients.

[0015] 2. This utility model improves the connection stability between the protective layer and the crown body by setting a micro-convex positioning platform and a micro-concave positioning groove on the outer wall of the crown body. After the protective layer is cured, a transition layer is set on the inner wall of the pre-formed cavity. The transition layer conforms to the shape of the outer wall of the crown body and bonds and fixes the crown body to the tooth body. The horizontal shoulder at the bottom of the crown body expands the contact volume between the transition layer and the protective layer. The integrated cured protective layer and transition layer cover the crown body, which can not only effectively fit the tooth body at the gingiva, but also form a protective enclosure for the crown body, thereby improving the stability of the connection between the crown body and the tooth body. Attached Figure Description

[0016] Figure 1 This is a front view of the present invention;

[0017] Figure 2 This is a front sectional view of the present invention.

[0018] Reference numerals in the attached diagram: 1. Crown body; 2. Pre-formed cavity; 3. Connecting groove; 4. Connector; 5. Countersunk platform; 6. Protective layer; 7. Micro-convex positioning platform; 8. Micro-concave positioning groove; 9. Occlusal recess; 10. Shoulder; 11. Transition layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] Please see Figure 1 - Figure 2 This utility model provides a pre-formed crown for children's composite ceramic restoration, including a crown body 1, with a hollow pre-formed cavity 2 formed inside the crown body 1. The pre-formed cavity 2 fits into the tooth body. Specifically, the structure of the crown body 1 is similar to that of deciduous and permanent teeth, and the pre-formed cavity 2 is adapted to the shape of deciduous or permanent teeth. The crown wall thickness of the crown body 1 is 1-2 mm, and the center of the top surface of the crown body 1 is concave downwards. Specifically, the top edge of the crown body 1 is rounded. A protective layer 6 is provided on the outer wall of the crown body 1, and the protective layer 6 forms an occlusal recess 9 at the concave part of the top surface of the crown body 1. The crown body 1 is made of ceramic material, and the protective layer 6 is made of resin material. The crown body 1 and the protective layer 6 are... Specifically, the crown body 1 and the protective layer 6 are bonded together using a general adhesive or resin adhesive to form a ceramic and resin composite. The edges of the protective layer 6 can be modified for preform crown shaping. The crown body 1 and the protective layer 6 work together to form a preform crown that is installed on the tooth. The preform crown is bonded together with the ceramic crown body 1 and the resin protective layer 6. There are various color options and good aesthetics. By shaping the protective layer 6 on the outside of the crown body 1, the dentist does not need to change the tooth preparation and usage habits. There is less foreign body sensation, less wear on the opposing teeth and adjacent teeth, or even no wear at all. It will not affect the dentition development and jawbone development of young patients.

[0021] In this embodiment, preferably, a micro-protrusion positioning platform 7 is formed on the outer wall of the crown body 1. The micro-protrusion positioning platform 7 cooperates with the protective layer 6. Specifically, the height of the micro-protrusion positioning platform 7 is 0.1-0.2mm. By setting the micro-protrusion positioning platform 7 on the outer wall of the crown body 1, the stability of the connection between the crown body 1 and the protective layer 6 can be improved.

[0022] In this embodiment, preferably, a micro-recessed positioning groove 8 is formed on the outer wall of the crown body 1, and the protective layer 6 fills the micro-recessed positioning groove 8. Specifically, the depth of the micro-recessed positioning groove 8 is 0.1-0.2mm. By setting the micro-recessed positioning groove 8 on the outer wall of the crown body 1 and filling the micro-recessed positioning groove 8 with the protective layer 6, the connection stability between the protective layer 6 and the crown body 1 is improved after the protective layer 6 is cured.

[0023] In this embodiment, preferably, the inner wall of the preformed cavity 2 is provided with a transition layer 11. The transition layer 11 is used to bond and fix the crown body 1 to the tooth body. Specifically, the thickness of the transition layer 11 is 0.1-0.3mm, and the transition layer 11 is a resin adhesive. The transition layer 11 is provided on the inner wall of the preformed cavity 2, and the outer wall of the tooth body is filled by the transition layer 11. Then, the transition layer 11 bonds and fixes the crown body 1 to the tooth body, thereby improving the stability of the connection between the crown body 1 and the tooth body.

[0024] In this embodiment, preferably, a shoulder 10 is formed at the bottom of the crown body 1. The shoulder 10 is used for the overflow of the transition layer 11. The overflow portion of the transition layer 11 is connected to the protective layer 6 at the shoulder 10. Specifically, the overflow portion of the transition layer 11 is bonded to the protective layer 6 and cured by ultraviolet light. The horizontal shoulder 10 can expand the contact volume between the transition layer 11 and the protective layer 6. The integrated cured protective layer 6 and transition layer 11 cover the crown body 1, which can not only effectively fit the tooth body at the gingiva, but also form a protective enclosure for the crown body 1.

[0025] In this embodiment, preferably, a recessed connecting groove 3 is formed on the crown top of the crown body 1, and a connector 4 is provided in the connecting groove 3. The connector 4 is used to connect the tooth body. Specifically, the tooth body is drilled to form a countersunk hole that matches the connector 4. The countersunk hole is filled with resin, and the connector 4 is inserted into the hole to contact the resin. The resin filled in the hole is cured by ultraviolet light to form a threaded groove that matches the connector 4. After the crown body 1 is installed, it is connected to the formed threaded groove through the connector 4, thereby stably connecting the crown body 1 and the tooth body and further preventing detachment.

[0026] In this embodiment, preferably, the inner diameter of the connecting groove 3 is larger than the outer diameter of the top of the connector 4, and the top surface of the connector 4 is slightly higher than the inner bottom surface of the connecting groove 3. The protective layer 6 fills the connecting groove 3 and covers the top of the connector 4. The protective layer 6 can fill the connecting groove 3 and cover the connector 4 during the curing process, thereby fixing and encapsulating the connector 4 and improving the stability of the crown body 1.

[0027] In this embodiment, preferably, a countersunk platform 5 is formed on the top of the preformed cavity 2. The countersunk platform 5 is used to sink into the top surface of the tooth. Specifically, after the countersunk hole that mates with the connector 4 is drilled in the tooth, the top surface of the countersunk hole is expanded and polished to form a countersunk groove that mates with the countersunk platform 5. Thus, by setting the countersunk platform 5 to sink into the top surface of the tooth, the stability of the crown body 1 is improved.

[0028] In this embodiment, the connector 4 is pre-embedded in the opening on the top surface of the tooth. After the crown body 1 is installed, the crown body 1 is stably connected to the tooth through the connector 4, and the protective layer 6 is used to fill the connecting groove 3. During the curing process, the connector 4 is covered, which not only forms a comprehensive protection for the crown body 1, but also prevents the pre-formed crown from falling off.

[0029] The working principle and usage process of this utility model are as follows: In use, the crown body 1 and the protective layer 6 work together to form a pre-formed crown installed on the tooth. The pre-formed crown is bonded and composited by the ceramic crown body 1 and the resin protective layer 6. It offers a variety of color options and good aesthetics. By shaping the protective layer 6 on the outside of the crown body 1, the dentist does not need to change their tooth preparation and usage habits. It also minimizes the foreign body sensation, causes minimal wear on the opposing teeth and adjacent teeth, and may even cause no wear. It will not affect the development of the dental arch or jawbone in young patients. The transition layer 11 is used to fill the outer wall of the tooth in a conformal manner, and then the transition layer 11 bonds and fixes the crown body 1 to the tooth. At the same time, the shoulder 10 expands the contact volume between the transition layer 11 and the protective layer 6. The integrated protective layer 6 and the transition layer 11 cover the crown body 1, which not only effectively fits the tooth at the gum line but also forms a protective enclosure for the crown body 1. The encapsulated connector 4 further stabilizes the crown body 1 to the tooth, effectively preventing detachment.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-formed crown for pediatric composite ceramic restoration, comprising a crown body (1), characterized in that: The crown body (1) forms a hollow pre-formed cavity (2), which fits with the tooth body. The top surface of the crown body (1) is recessed downwards. The outer wall of the crown body (1) is provided with a protective layer (6). The protective layer (6) forms an occlusal recess (9) at the recess on the top surface of the crown body (1). The crown body (1) is made of ceramic material, and the protective layer (6) is made of resin material. The crown body (1) and the protective layer (6) are bonded together.

2. The pre-formed crown for pediatric composite ceramic material repair according to claim 1, characterized in that: The outer wall of the crown body (1) is formed with a micro-convex positioning platform (7), which cooperates with the protective layer (6).

3. The pre-formed crown for pediatric composite ceramic material repair according to claim 2, characterized in that: The outer wall of the crown body (1) is also formed with a micro-recessed positioning groove (8), and the protective layer (6) fills the micro-recessed positioning groove (8).

4. The pre-formed crown for pediatric composite ceramic material repair according to claim 1, characterized in that: The crown body (1) has a recessed connecting groove (3) formed on the crown top, and a connector (4) is provided in the connecting groove (3) for connecting the tooth body.

5. The pre-formed crown for pediatric composite ceramic material repair according to claim 4, characterized in that: The inner diameter of the connecting groove (3) is greater than the outer diameter of the top of the connector (4), the top surface of the connector (4) is slightly higher than the inner bottom surface of the connecting groove (3), and the protective layer (6) fills the connecting groove (3) and covers the top of the connector (4).

6. The pre-formed crown for pediatric composite ceramic material repair according to claim 5, characterized in that: A countersunk platform (5) is formed on the top of the preformed cavity (2), which is used to sink into the top surface of the tooth.

7. The pre-formed crown for pediatric composite ceramic material repair according to claim 1, characterized in that: The inner wall of the preformed cavity (2) is provided with a transition layer (11), which is used to bond and fix the crown body (1) to the tooth body.

8. The pre-formed crown for pediatric composite ceramic material repair according to claim 7, characterized in that: The crown body (1) has a shoulder (10) at its bottom end. The shoulder (10) is used for the overflow of the transition layer (11). The overflow portion of the transition layer (11) is connected to the protective layer (6) at the shoulder (10).

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