Evaluation of the Bonding Strength between Various Dental Zirconia Models and Human Teeth for Dental Posts through In Vitro Aging Tests

Abstract

In dentistry, root canal treatment reduces support of the tooth, making it necessary to insert a cylindrical body into the treated tooth to strengthen the crown. In the past, metal or fiberglass was often used. However, metal is too different in color from teeth, so the esthetics are poor, and fiberglass is not as strong as metal. Therefore, an alternative is zirconia, which has the characteristics of high light transmittance, esthetics, good biocompatibility, and high breaking strength. The surface morphology and composition of zirconia ceramics are the key to their bond strength with teeth. Therefore, in this study, the surface characteristics of different brands of zirconia commonly used in clinical practice were evaluated in terms of their surface morphology and surface elements. The surface was modified by sandblasting, and its effect on the bonding strength was discussed. Finally, the stability of the material was evaluated through artificial aging. The results showed that the surface roughness of the zirconia specimens increased after sandblasting, whereas the surface microhardness decreased. The shear test results showed that the 3D shape of the zirconia surface could help improve the bonding strength. The bonding strength of DeguDent increased the most after sandblasting. After 20,000 cycles of aging treatment, the shear strength of each specimen decreased. Field emission scanning electron microscopy results showed that the adhesive remained intact on the surface of zirconia, indicating that adhesion failure occurred between the adhesive and the teeth. This confirms that sandblasting can improve the bonding strength of zirconia. Based on the results obtained, it was concluded that the surface roughness of zirconia is the main factor affecting the bond strength.

Comparative analysis of bonding strength between enamel and overlay of varying thicknesses following an aging test

“…Resin cement (OptiBond FL Prime, KaVo Kerr) was applied to the ceramic surface, which was then seated onto the tooth. 13 …”

“…These factors can affect the bonding surfaces between a dental restoration and a tooth, reducing their long-term stability. 13 In order to make the test results of materials more consistent with clinical results, many studies simulate the environment in the oral cavity through thermal cycles between hot and cold. 14 , 15 This helped assess the long-term utility of the adhesive strength between the overlay and residual enamel through the aging test.…”

Dental Surface Conditioning Techniques to Increase the Micromechanical Retention to Fiberglass Posts: A Literature Review

“…Post and crown are dental rehabilitation options for dental organs extensively damaged [1]. Posts could be metallic [2], ceramic [3] or fiber reinforced composite [4]. The glass fiber posts (GFPs) are the most frequently used posts nowadays as they have elastic moduli that share similar to dentin [5,6].…”

Calcium Phosphate Nanoclusters for the Repair of Tooth Enamel Erosion

“…Tooth decay is also known as the most common chronic disease in the world [10][11][12]. Although tooth enamel cannot be naturally repaired, several approaches have been utilized to artificially repair tooth enamel, including dental bonding, veneers, crowns, and remineralization [13][14][15][16][17][18][19]. For dental bonding, a dental resin is attached to the tooth surface to repair the enamel erosion and protect the intact tooth surface [20].…”