KR102159287B1 - Surface treatment method for improving bond strength of dental resin ceramic - Google Patents

Abstract

The present invention relates to a surface treatment method for enhancing the bonding strength of a dental resin ceramic, and in particular, the present invention includes the step of complex treatment of the inner surface of the dental resin ceramic restoration by sandblasting and etching. It relates to a surface treatment method for improving the bonding strength of the dental resin ceramic. The surface treatment method for enhancing the bonding strength of the dental resin ceramic according to the present invention is a composite treatment of sandblasting and etching treatment on the surface of the resin ceramic at the same time to induce mechanical and chemical bonding at the same time. It is possible to improve long-term suitability and bonding in the oral cavity, and suppress tilting and debonding due to masticatory movements in the oral cavity through improved bonding between ceramic and dental cement.

Description

Surface treatment method for improving bond strength of dental resin ceramic {Surface treatment method for improving bond strength of dental resin ceramic}

The present invention relates to a surface treatment method for improving the bonding strength between dental resin ceramic and cement.

Resin ceramic material is a material that improves the physical and aesthetic properties of the material by combining the advantages of ceramic and resin material.It is a material that reduces thermal expansion and polymerization shrinkage, high flexural strength, abrasion similar to natural teeth, easy repair, and excellent biocompatibility. It is a material with advantages and is used in the dental field.

In addition, dental cement is a mechanical shield that helps regenerate biological tissues for the treatment of damaged teeth, such as for tooth restoration, tooth bonding, pulp regeneration, and biomaterials for periodontal regeneration, restoration of damaged teeth, tooth restorations or orthodontic windows. As a dental treatment material that plays a role in fixing teeth, it is a material used in contact with biological tissues other than the normal skin of the oral cavity.

Adhesion of dental resin ceramic is the final step of treatment and is a very important step to determine the success of treatment. In the adhesion step, dental cement is used, and cement is an adhesive that provides retention between the removed tooth and the restoration. It functions as a luting agent and is used as a restorative material to permanently or temporarily fill the formed cavity.

In dentistry clinical practice, restorations made using resin ceramic materials induce bonding with dental cement through sandblasting or etching treatment on the inner surface of the restoration in order to enhance the bonding strength with the prepared abutment.

However, in the case of a resin ceramic material, as the modulus of elasticity due to the combination of the ceramic and the resin material increases, the final attempted crown restoration is affected by the mastication movement in the oral cavity, causing a detachment phenomenon often.

Therefore, there is a need to develop a new technology to improve the adhesion between ceramic and dental cement so that it can be used for a long time in the oral cavity without such a problem.

Korean Patent Registration No. 10-1763573

Accordingly, an object of the present invention is to provide a surface treatment method for enhancing the bonding strength of a dental resin ceramic.

Another object of the present invention is to provide a dental resin ceramic with improved bonding strength by surface treatment of the inner surface of a dental resin ceramic restoration by the method of the present invention.

Therefore, the present invention provides a surface treatment method for enhancing the bonding strength of a dental resin ceramic, comprising the step of complexly treating the inner surface of the dental resin ceramic restoration by sandblasting and etching.

In one embodiment of the present invention, the sandblasting treatment may be performed by applying sand of 40 to 60 μm particles at a pressure of 4 to 6 bar.

In one embodiment of the present invention, the sand may be selected from the group consisting of aluminum oxide, iron oxide, glass beads, and zirconia oxide.

In one embodiment of the present invention, the etching may be processing an etching gel for about 10 to 20 seconds.

In addition, the present invention provides a dental resin ceramic with improved bonding strength by surface treatment of the inner surface of a dental resin ceramic restoration by the method of the present invention.

The surface treatment method for enhancing the bonding strength of the dental resin ceramic according to the present invention is a composite treatment of sandblasting and etching treatment on the surface of the resin ceramic at the same time to induce mechanical and chemical bonding at the same time. It is possible to improve long-term suitability and bonding in the oral cavity, and suppress tilting and debonding due to masticatory movements in the oral cavity through improved bonding between ceramic and dental cement.

1 is a schematic view showing a process of surface treatment of an inner surface of a resin ceramic restoration by a composite treatment of sandblasting and etching.
Figure 2 is a photograph showing a resin ceramic specimen prepared for measuring the bonding strength in an embodiment of the present invention.
3 is a photograph showing a process of attaching dental cement using a jig for shear bonding strength in an embodiment of the present invention.
Figure 4 shows a shear bond strength test process in an embodiment of the present invention.

The present invention is an improved dental resin capable of improving long-term suitability and bonding strength in the oral cavity when attempting a dental resin ceramic restoration by simultaneously inducing mechanical and chemical bonding through a composite treatment of sandblasting and etching on the surface of the resin ceramic. It is characterized by providing a surface treatment method for enhancing the bonding strength of ceramics.

Specifically, the surface treatment method for enhancing the bonding strength of the dental resin ceramic according to the present invention includes the step of performing a complex treatment on the inner surface of the dental resin ceramic restoration by sandblasting and etching.

Sand blasting refers to the work of spraying fine sand with high pressure air from a nozzle and colliding with the surface of a work piece such as a casting to clean the surface. For example, it is possible to remove oxide scale or rust by spraying sand such as silica sand with high-pressure air or projecting it on the surface of a workpiece with an impeller (wing wheel) rotating at a high speed.

Alternatively, by manipulating the spray nozzle, one side or rear side of a complex shape can be finished.

Preferably, the sandblasting treatment of the present invention may be performed by treating sand of 40-60 μm particles at a pressure of 4-6 bar.

On the other hand, if the pressure is less than 4bar, the unevenness of the ceramic surface may be a factor that hinders the bonding force with the resin cement. In addition, if the pressure exceeds 6bar, it is more than necessary due to strong pressure. There is a problem that may damage the prosthesis because the surface is cut off.

In addition, the sand is not limited thereto, but may be selected from the group consisting of aluminum oxide, iron oxide, glass beads, and zirconia oxide, and preferably, glass beads may be used.

In the present invention, the etching treatment may be performed by surface treatment of the inner surface of the dental restoration for about 10 to 20 seconds using an etching gel.

In addition, in the present invention, the "restoration" refers to a dental filling or casting used to regenerate a portion of a tooth damaged by tooth decay or to replace the root of a lost tooth, and the type of tooth restoration is a crown ( Crowns, inlays, onlays, veneers and laminates.

Recently, users' expectations for the aesthetic aspect of dental restorations are also increasing.For example, for dental restorations that cover the entire tooth, such as crowns, dental restorations or resin ceramics using all ceramic materials are used more than conventional metal restorations. There is an increasing demand for dental restorations made of materials.

In addition, the development of digital computer technology is being used in the manufacture of ceramic restorations according to the utilization of the CAD cam system for the clinic as the oral scanner was introduced. However, in general, when the ceramic restoration is manufactured using the CADCAM system, the ceramic is brittle, so it is easy to break and the fracture resistance is weak.

Accordingly, in recent years, in order to compensate for the disadvantages of brittleness in ceramics and increase the processability and suitability of CAD/CAM prostheses, resin ceramic materials that complement the advantages and disadvantages of ceramics and resins have been developed, and the tendency to use them is increasing.

However, as the modulus of elasticity of the resin ceramic material increases, the final suitable crown restoration is detached in the oral cavity, causing clinical failure of the prosthesis.

Accordingly, in the present invention, as a method for enhancing the adhesive strength of a dental restoration made of a resin ceramic material, as described above, a complex method of sandblasting the inner surface of the resin ceramic restoration and then directly etching the resin ceramic restoration. By this, it was confirmed that it is possible to manufacture a dental resin ceramic with improved bonding strength.

In particular, according to an embodiment of the present invention, the bonding strength was measured for a group in which the inner surface of a resin ceramic restoration was treated solely by sandblasting, a group treated solely by etching, and a composite treatment group of sandblasting and etching. It was confirmed that the specimen of the present invention, which was subjected to a complex treatment of sandblasting and etching, compared to the group treated alone, had a significantly superior bonding strength.

Therefore, when the method of the present invention is applied, the present inventors improve the long-term suitability and bonding force in the oral cavity when attempting a restoration, and improve the bonding force between ceramic and dental cement, resulting in a tilting phenomenon and decoupling ( It was found that debonding) can be suppressed.

Hereinafter, the present invention will be described in more detail through examples. These examples are for explaining the present invention more specifically, and the scope of the present invention is not limited to these examples.

<Example 1>

Surface treatment of resin ceramics with a combination of sandblasting and etching

First, a resin ceramic specimen for use in the experiment was manufactured in a circular shape with a diameter of 7 mm and a height of 2 mm, and was embedded with acrylic resin in a cylindrical mold having a diameter of 19 mm and a height of 10.5 mm to prepare a resin ceramic specimen as shown in FIG. 2.

After that, for the purpose of improving the bonding strength between the resin ceramic and cement, the inner surface of the resin ceramic restoration was surface-treated through a complex treatment of sandblasting and etching.For the sandblasting treatment, glass beads of 50 μm particles A sandblasting sample was prepared by applying a pressure of 4 bars, and it was treated on the inner surface of the resin ceramic restoration. Thereafter, the etching gel was treated on the inner surface of the resin ceramic restoration for 15 seconds, so that the inner surface of the resin ceramic restoration was subjected to a complex treatment by sandblasting and etching (see FIG. 1 ). In addition, as the etching gel used in the experiment of the present invention, 3M's ESPE Scotchbond™ Universal Etchant etching gel was used, and a product comprising a component containing 32% phosphoric acid was used.

Thereafter, a dental restoration was manufactured by attaching dental cement using a jig for shear bond strength (see Fig. 3), and at this time, the standard of the specimen for measuring the shear bond strength is not in ISO regulations, so a known document (Korean Journal). of Dental Materials. 2016;43(4):307) was used to prepare a specimen for shear bond strength measurement using a cement bonding jig.

< Comparative example 1>

A dental restoration was manufactured in the same manner as in Example 1 except that only the sandblasting treatment was performed. That is, the etching treatment was not performed.

<Comparative Example 2>

A dental restoration was manufactured in the same manner as in Example 1, except that only etching treatment was performed. In other words, sandblasting was not performed.

<Example 2>

Flexural strength test

A shear bond strength test was performed on the dental prosthesis (reinforcing material) prepared in Example 1 and Comparative Examples to check the bond strength between the resin ceramic and the cement (see FIG. 4). The bonding strength was evaluated as a 3-point flexural strength value.

As a result, as shown in Table 1, the value of the shear bond strength of the sample subjected to only sand blasting was 11.39 Mpa, and the value of the shear bond strength of the sample subjected to only etching was measured to be 7.96 Mpa. On the other hand, the sample of the present invention subjected to sandblasting and etching treatment at the same time showed a result value of 14.32Mpa, it was found that when the method according to the present invention was performed, it could have a significantly higher bonding strength.

Through this result, the present inventors can improve the bonding strength between the resin ceramic and cement when the inner surface of the restoration of the dental resin ceramic is subjected to a complex treatment of sandblasting and etching, and the oral cavity of the restoration for the crown, which has been a conventional problem. It was found that the desorption phenomenon in the can be improved and the stability can be improved.

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims (5)

Including the step of complex treatment of the inner surface of the dental resin ceramic restoration by sandblasting (sandblasting) and etching (etching),
The sandblasting is performed by applying sand of 40-60um particles at a pressure of 4-6bar,
The etching is characterized in that the etching gel (etching gel) 10 to 20 seconds treatment, the surface treatment method for enhancing the bonding strength of the dental resin ceramic. delete The method of claim 1,
The sand is characterized in that selected from the group consisting of aluminum oxide, iron oxide, glass beads, and zirconia oxide, the surface treatment method for improving the bonding strength of the dental resin ceramic. delete delete

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