EFFECT OF RESIN CEMENT THICKNESS AND CERAMIC THICKNESS ON COMPRESSIVE FRACTURE RESISTANCE OF ENAMEL-BONDED CERAMIC

Abstract

Objective This study aimed to evaluate the compressive fracture resistance of enamel-boned ceramic with variation in cement thickness and ceramic thickness. Materials and methods Leucite-reinforced and lithium-disilicate ceramic (0.5 and 1mm thick) were cemented to human enamel using resin composite cement at the thicknesses of 30 and 100µm. Non-cemented ceramic was used as control. Fracture load (Newton) was obtained by pressing a 2mm-diameter indenter rod against ceramic. Two-way ANOVA and two-sample t-tests were used to compare mean fracture loads (MFL). Results The results obtained from both type of ceramic were in the same trend, i.e. for 0.5 thick ceramic, both 30µm and 100µm groups were significantly higher than control group. No difference in MFL between two test groups was found. (leucite-reinforced ceramic: 30µm – 771.56±107.35; 100µm —810.06±110.26; lithium-disilicate ceramic: 30µm —2471.81±339.52; 100µm —2666.58±245.15) On the other hand, when ceramic thickness was 1mm, MFL of both test groups were significantly higher from control group. Also, MFL of 30µm group was significantly higher than that of 100µm group. (leucite-reinforced ceramic: 30µm–2666.20±220.46; 100µm—1748.39±245.24; lithium-disilicate ceramic: 30µm—3547.38±310.30; 100µm—2622.17±256.99) Conclusion Non-cemented PLVs showed significantly lower MFL. The thicker cement group showed a decreased MFL for 1mm PLVs only. No significant difference was found for the 0.5mm groups. These results applied to both types of ceramic.