Abstract
Background and aims. Use of porcelain as inlays, laminates and metal-ceramic and all-ceramic crowns is common in modern dentistry. The high cost of ceramic restorations, time limitations and difficulty of removing these restorations result in delays in replacing fractured restorations; therefore, their repair is indicated. The aim of the present study was to compare the shear bond strengths of two types of composite resins (methacrylate-based and silorane-based) to porcelain, using three adhesive types.Materials and methods. A total of 156 samples of feldspathic porcelain surfaces were prepared with air-abrasion and randomly divided into 6 groups (n=26). In groups 1-3, Z250 composite resin was used to repair porcelain samples with Ad-per Single Bond 2 (ASB), Clearfil SE Bond (CSB) and Silorane Adhesive (SA) as the bonding systems, afterapplication of silane, respectively. In groups 4-6, the same adhesives were used in the same manner with Filtek Silorane composite resin. Finally, the shear bond strengths of the samples were measured. Two-way ANOVA and post hoc Tukey tests were used to compare bond strengths between the groups with different adhesives at P<0.05.Results. There were significant differences in the mean bond strength values in terms of the adhesive type (P<0.001). In addition, the interactive effect of the adhesive type and composite resin type had no significant effect on bond strength (P=0.602).Conclusion. The results of the present study showed the highest repair bond strength values to porcelain with both composite resin types with the application of SA and ASB.
Highlights
Use of porcelain as inlays, onlays, laminates and metal-ceramic and all-ceramic crowns is common in modern dentistry
Based on the results of post hoc Tukey tests there were significant differences in bond strengths between the groups bonded with Adper Single Bond 2 and Clearfil SE Bond adhesive systems (P
There were significant differences in bond strengths between the groups bonded with Clearfil SE Bond and Silorane Adhesive Systems (P
Summary
Use of porcelain as inlays, onlays, laminates and metal-ceramic and all-ceramic crowns is common in modern dentistry. Feldspathic porcelains or leucite-based glass-matrix dental ceramics are commonly used due to their high esthetic appearance.[1] Factors such as fatigue, occlusal forces, inappropriate design, poor preparation of the abutment and technical errors during laboratory procedures and physical traumas can result in the failure of cohesive bonds in the porcelain.[2,3] The high cost of ceramic restorations, time limitations and difficulty of removing these restorations result in delays in replacing fractured restorations; their repair is indicated.[4] The surface of ceramics should be prepared by roughening with the use of rotary diamond burs, by abrasion using air-borne particles, and by surface etching by hydrofluoric acid (HF) or acidulated phosphate fluoride (APF) gel. The results of the present study showed the highest repair bond strength values to porcelain with both composite resin types with the application of SA and ASB.
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