CN211409456U

CN211409456U - 3D printing zirconia restoration

Info

Publication number: CN211409456U
Application number: CN201921452520.0U
Authority: CN
Inventors: 吴国锋; 陈晞; 陆伟; 孙方方; 戴沄
Original assignee: NANJING STOMATOLOGICAL HOSPITAL
Current assignee: NANJING STOMATOLOGICAL HOSPITAL
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-09-04
Anticipated expiration: 2029-09-03

Abstract

The invention discloses a 3D printed zirconia restoration, which relates to the technical field of dental restoration, wherein an adhesive surface for adhering with a tooth body on the restoration is a roughened surface, the roughened surface comprises an adhesive surface and a micro-texture arranged on the adhesive surface, and the micro-texture comprises a plurality of bumps, grooves or bumps and grooves; the invention directly prepares the zirconia restoration body with the coarsened surface by the 3D printing technology, increases the bonding area of the resin adhesive and the restoration body, and improves the bonding performance of the restoration body and the tooth body.

Description

3D printing zirconia restoration

Technical Field

The invention relates to the technical field of dental restoration, in particular to a 3D printed zirconia restoration.

Background

In recent years, Yttrium stabilized tetragonal polycrystalline zirconia (Y-TZP) ceramics are widely used in the fields of oral repair and implantation, and 3-5% Yttrium oxide (Y2O 3) is added to maintain a stable tetragonal crystal structure, so that the mechanical properties and chemical stability are remarkably improved compared with those of a traditional glass-based ceramic system. Zirconia ceramics are the ceramic materials of choice in dental restorative treatment because of their excellent mechanical properties, aesthetic properties and biocompatibility. The zirconia ceramic full-crown and multi-unit fixed bridge needs to be fixed on the surface of a tooth body through a resin adhesive. The adhesion between zirconia and resin mainly includes micromechanical locking force and chemical adhesion, which needs roughening treatment, cleaning and surface activation of the ceramic surface. However, the zirconia ceramic and the silicate ceramic have far different structures and compositions, so that the zirconia ceramic and the silicate ceramic have significant difference in bonding technology. The bonding technology and the related mechanism for the silicate ceramics are mature, and a satisfactory bonding effect is obtained clinically. The glass substrate in the silicate ceramics can be selectively dissolved through the acid etching effect of hydrofluoric acid or ammonium bifluoride solution, so that the crystal structure is exposed, the surface roughness of the silicate ceramics is improved, and the micro-mechanical locking retention force between the ceramics and the resin is enhanced. The silane coupling agent is applied to the surface of the silicate ceramic subjected to surface roughening treatment, so that chemical covalent bonds and hydrogen bond bonding can be formed between the ceramic and the resin, and the chemical bonding force between the silicate ceramic restoration and the resin is provided.

The zirconia ceramics do not contain a glass matrix component and are difficult to be etched by hydrofluoric acid or phosphoric acid to form a rough surface to provide mechanical retention. In addition, the content of silicon element in zirconia ceramics is less than 1 wt%, while the content of silicon element in feldspar porcelain is as high as 50%, so that silane is difficult to sufficiently exert chemical coupling action on the zirconia surface. The good surface stability and chemical inertness can cause the low-efficiency and non-durable bonding effect between the zirconia restoration and the tooth tissue, the bonding force of the bonding agent is difficult to resist the attenuation effect of aging to the bonding force in the using process, and the long-term survival rate of the restoration is reduced. The zirconia has the characteristic of chemical inertness, so that the adhesion of the zirconia and resin becomes a clinical difficulty and a research hotspot. Surface modification of zirconia is essential to achieve better micro-mechanical interlocking or chemical bonding to increase the bonding strength.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a 3D printed zirconia restoration.

In order to solve the technical problems, the technical scheme of the invention is as follows:

A3D printing zirconia restoration body is characterized in that an adhesion surface used for adhering with a tooth body on the restoration body is a roughened surface, the roughened surface comprises an adhesion surface and a micro-texture arranged on the adhesion surface, and the micro-texture comprises a plurality of bumps, grooves or bumps and grooves.

Further, the bump is a regular-shaped or irregular-shaped geometric body, and the groove is a regular-shaped or irregular-shaped geometric body.

In the 3D printed zirconia restoration, the projections and the grooves are all right prisms.

In the 3D printed zirconia prosthesis, the projection and the groove are both cylinders.

In the 3D printed zirconia prosthesis, the projection and the groove are both in the shape of a truncated cone.

In the 3D printed zirconia prosthesis, the diameter of the end face of the truncated cone-shaped projection facing the tooth is larger than the diameter of the end face of the truncated cone-shaped projection far away from the tooth, and the diameter of the end face of the truncated cone-shaped groove facing the tooth is larger than the diameter of the end face of the truncated cone-shaped groove far away from the tooth.

The 3D printing zirconia restoration has the depth of the micro-texture of 200-300 mu m.

The invention has the beneficial effects that:

(1) according to the invention, the zirconia restoration body with the roughened surface is directly prepared by a 3D printing technology, and the surface micro-morphology of silicate ceramics treated by hydrofluoric acid is simulated, so that the capacity of a resin adhesive is increased, the specific surface area of an adhesive surface is increased, the micro-mechanical locking force of the resin-based adhesive is greatly increased, the problem that the zirconia restoration body cannot form the roughened surface due to the fact that the zirconia restoration body is difficult to be corroded by hydrofluoric acid or phosphoric acid is solved, and the adhesive property of the zirconia restoration body and a tooth body is improved; compared with cutting processing, the problems of material waste, cutter abrasion, more processing cycle times and the like are avoided;

(2) the shape and the depth of the micro-texture can be controlled by a 3D printing technology, so that the micro-texture can be adjusted according to actual needs, and the application range is wider;

(3) the invention also designs the micro-texture into the boss or the groove, when the two forms of micro-texture are used, the resin adhesive can enter the gap or the groove between the bosses, and after the adhesive is solidified, a stronger limiting force can be generated between the adhesive and the micro-texture, thereby further improving the adhesive property of the adhesive and the restoration.

Drawings

FIG. 1 is a schematic view of a roughened surface of example 1;

FIG. 2 is a schematic view of the roughened surface of example 2;

FIG. 3 is a schematic view of the roughened surface of example 3;

FIG. 4 is a schematic view of the roughened surface of example 4;

FIG. 5 is a schematic view of the roughened surface of example 5;

FIG. 6 is a schematic view of the roughened surface of example 6;

FIG. 7 is a schematic view of the roughened surface of example 7;

FIG. 8 is a schematic view of the roughened surface of example 8;

wherein: 1. a bump; 2. a groove; 3. and (3) repairing the body.

Detailed Description

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

Example 1:

the embodiment provides a 3D printed zirconia prosthesis, wherein an adhesive surface for adhering with a tooth body on the prosthesis 3 is printed as a roughened surface by a 3D printing technology, the roughened surface comprises the adhesive surface of the zirconia prosthesis 3 and a micro-texture arranged on the adhesive surface, the micro-texture is a plurality of bumps 1 uniformly arranged on the adhesive surface, referring to fig. 1, the bumps 1 are in a shape of a straight quadrangular prism, the side length of the end surface of the straight quadrangular prism is 200 μm, and the height of the bumps is 200 μm. The pitch between any two adjacent bumps 1 is 300 μm.

The embodiment also provides a preparation method of the 3D printed zirconia restoration, which comprises the following steps:

s1: scanning the oral cavity of a patient by adopting a digital scanning technology to obtain a digital oral cavity model;

s2: designing a restoration body on the basis of a digital oral cavity model, designing a roughened surface on an adhesive surface for adhering with a tooth body on the restoration body, and then printing out the zirconium oxide restoration body by a 3D printing technology.

The embodiment also provides a bonding method of the 3D printed zirconia restoration and the tooth body, which comprises the following steps:

s1: preparing a zirconia restoration body, and coating a resin adhesive on the adhesive surface of the restoration body;

s2: the method comprises the following steps of pretreating the bonding surface of the tooth body, wherein the pretreatment comprises the following specific steps: cleaning and polishing a tooth surface, coating phosphoric acid gel on the tooth surface, washing, keeping the tooth surface wet, coating a pretreatment agent, slightly blowing and irradiating by light, and coating a resin adhesive on the bonding surface of a tooth body after the pretreatment is finished;

s3: and (3) connecting the bonding surface of the zirconia restoration body to the bonding surface of the tooth body to position the zirconia restoration body, and then illuminating to complete the bonding of the zirconia restoration body and the tooth body.

In the embodiment, during bonding, the resin adhesive enters the gaps among the bumps 1, so that the capacity of the resin adhesive is increased, the specific surface area of the bonding surface is increased, the micro-mechanical locking force of the resin-based adhesive is greatly increased, and the bonding performance of the zirconia prosthesis 3 and the tooth body is ensured.

Example 2:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: the micro-texture arranged on the bonding surface in the embodiment is a plurality of grooves 2 uniformly formed on the bonding surface, the grooves 2 are all groove bodies reserved in 3D printing, referring to fig. 2, the grooves 2 are all in the shape of a straight quadrangular prism, the side length of the end surface of the straight quadrangular prism is 200 μm, and the height of the straight quadrangular prism is 200 μm. The pitch between any adjacent two grooves 2 is 300 μm.

In the embodiment, when in adhesion, the resin adhesive directly enters the groove 2, so that the adhesion performance of the zirconia prosthesis 3 and the tooth body is ensured.

Example 3:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: the micro-texture arranged on the bonding surface in the embodiment is a plurality of bumps 1 uniformly arranged on the bonding surface, referring to fig. 3, the bumps 1 are in a shape of a straight hexagonal prism, the side length of the bottom surface of the straight hexagonal prism is 200 μm, and the height of the bottom surface of the straight hexagonal prism is 200 μm. The pitch between any two adjacent bumps 1 is 300 μm.

In this example, the resin adhesive entered the gaps between the projections 1 at the time of adhesion, as in example 1, but in this example, the contact area of the resin adhesive with the side faces of the projections 1 was made larger, so that the specific surface area for adhesion was increased, and the adhesion of the zirconia prosthesis 3 to the tooth body was ensured.

Example 4:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: the micro-texture arranged on the bonding surface in the embodiment is a plurality of grooves 2 uniformly formed on the bonding surface, the grooves 2 are all groove bodies reserved during 3D printing, referring to fig. 4, the grooves 2 are all in the shape of a straight hexagonal prism, the side length of the end surface of the straight hexagonal prism is 200 μm, and the height of the end surface of the straight hexagonal prism is 200 μm. The pitch between any adjacent two grooves 2 is 300 μm.

In this example, the resin adhesive is directly entered into the grooves 2 in the adhesion as in example 2, but the side area and the bottom area of the grooves 2 are larger than those of example 2 in this example, so that the specific surface area of the adhesion surface is increased and the adhesion of the zirconia prosthesis 3 to the tooth body is ensured.

Example 5:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: the micro-texture on the bonding surface in this embodiment is a plurality of bumps 1 uniformly arranged on the bonding surface, referring to fig. 5, the bumps 1 are cylinders, and the diameter of the bottom surface of the cylinder is 200 μm and the height of the cylinder is 200 μm. The distance between the centers of the bottom surfaces of any two adjacent cylinders is 500 mu m.

Example 6:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: the micro-texture arranged on the bonding surface in the embodiment is a plurality of grooves 2 uniformly formed on the bonding surface, the grooves 2 are all groove bodies reserved during 3D printing, referring to fig. 6, the grooves 2 are all cylinders, the diameter of the bottom surface of each cylinder is 200 μm, and the height of each cylinder is 200 μm. The distance between the centers of the bottom surfaces of any two adjacent cylinders is 500 mu m.

Example 7:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: in this embodiment, the micro-texture on the bonding surface is a plurality of bumps 1 uniformly arranged, referring to fig. 7, the bumps 1 are in the shape of a circular truncated cone, the diameter of the end surface of the bump 1 facing the tooth is 300 μm, and the diameter of the end surface of the bump 1 facing the bonding surface of the zirconia prosthesis 3 is 200 μm, and the bump is in the shape of an inverted circular truncated cone. The distance between the centers of the bottom surfaces of any two adjacent circular truncated cones is 500 mu m.

In the embodiment, when bonding, the resin adhesive enters the gaps between the bumps 1, and after the adhesive is solidified, a strong limiting force can be generated between the adhesive and the micro-texture, so that the difficulty of generating relative displacement between the adhesive and the prosthesis 3 is increased, and the bonding performance between the adhesive and the prosthesis 3 is further improved.

Example 8:

this example provides a 3D printed zirconia prosthesis, which differs from example 1 in that: in this embodiment, the micro-texture arranged on the bonding surface is a plurality of grooves 2 uniformly formed on the bonding surface, the grooves 2 are all groove bodies reserved during 3D printing, referring to fig. 8, the grooves 2 are all circular truncated cone-shaped, the end surface diameter of the groove 2 facing one end of the tooth body is 300 μm, and the end surface diameter of the groove 2 facing one end of the bonding surface of the zirconia prosthesis 3 is 200 μm, and is in an inverted circular truncated cone shape. The distance between the centers of the bottom surfaces of any two adjacent circular truncated cones is 500 mu m.

In the embodiment, the resin adhesive directly enters the truncated cone-shaped groove 2 during bonding, so that the inverted truncated cone-shaped resin adhesive is formed, and after the resin adhesive is solidified, the resin adhesive positioned in the groove 2 can be used as a pulling part, so that the external resin adhesive is always attached to the bonding surface of the prosthesis 3, and the bonding performance of the adhesive and the prosthesis 3 is ensured.

In addition, the convex blocks or the concave grooves with other regular shapes can be set to be larger than the end surface area of the end surface facing the bonding surface of the zirconia prosthesis 3, so that the resin adhesive can form a pulling part, and the bonding performance of the adhesive and the prosthesis 3 is ensured.

The method provided by the invention is adopted to bond the zirconia restoration 3 and the tooth body, thereby solving the problem that the zirconia restoration 3 is difficult to be corroded by hydrofluoric acid or phosphoric acid and cannot form a roughened surface, and improving the bonding performance of the zirconia restoration 3 and the tooth body.

In addition to the above embodiments, the present invention may have other embodiments; all technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. The 3D printing zirconia prosthesis is characterized in that: the bonding surface used for bonding with the tooth body on the prosthesis (3) is a roughened surface, the roughened surface comprises a bonding surface and a micro-texture arranged on the bonding surface, and the micro-texture comprises a plurality of bumps (1), grooves (2) or bumps (1) and grooves (2).

2. The 3D printed zirconia prosthesis of claim 1, wherein: the bump (1) is a regular or irregular geometric body, and the groove (2) is a regular or irregular geometric body.

3. The 3D printed zirconia prosthesis of claim 2, wherein: the convex block (1) and the groove (2) are both straight prisms.

4. The 3D printed zirconia prosthesis of claim 2, wherein: the convex block (1) and the groove (2) are both cylinders.

5. The 3D printed zirconia prosthesis of claim 2, wherein: the lug (1) and the groove (2) are both in a circular truncated cone shape.

6. The 3D printed zirconia prosthesis of claim 5, wherein: the end face diameter of the circular truncated cone-shaped projection (1) towards one end of the tooth body is larger than that of the circular truncated cone-shaped projection (1) away from one end of the tooth body, and the end face diameter of the circular truncated cone-shaped groove (2) towards one end of the tooth body is larger than that of the circular truncated cone-shaped groove (2) away from one end of the tooth body.

7. The 3D printed zirconia prosthesis of any one of claims 1 to 6, wherein: the depth of the micro-texture is 200-300 μm.