Edge chipping resistance of three hybrid ceramics compared to zirconia-reinforced lithium silicate

Objective: This study compared the edge chipping resistance of three hybrid ceramics, including two polymer-infiltrated ceramic networks (PICNs; VITA Enamic and Crystal Ultra), and one resin nanoceramic (Lava Ultimate), with a zirconia-reinforced lithium silicate (VITA Suprinity).Methods: In this in vitro study, four restorative materials were prepared and tested (n=۱۰ per group), as follows: ۱: VITA Enamic, ۲: Crystal Ultra, ۳: Lava Ultimate, and ۴: VITA Suprinity. Specimens were fabricated in dimensions of ۱۰ × ۱۰ × ۲ mm, polished, and subjected to ۵,۰۰۰ thermocycles. Force was applied using a universal testing machine, with an indenter positioned at distances of ۰.۱ to ۰.۸ mm from the specimen edge. Edge chipping resistance was calculated from the slope of the force-distance curves. Data were analyzed using ANOVA and Tukey’s test, with significance set at P<۰.۰۵.Results: The highest edge chipping resistance was observed in VITA Suprinity (۲۰۱.۰۳ N/mm), while Lava Ultimate exhibited the lowest (۶۵.۶۹ N/mm). A statistically significant difference was found in edge chipping resistance among the groups (P=۰.۰۰۴). Tukey's test revealed that the edge chipping resistance was significantly greater in VITA Suprinity than in all other groups (P<۰.۰۵). Additionally, VITA Enamic and Crystal Ultra showed significantly greater edge chipping resistance than Lava Ultimate (P<۰.۰۵).Conclusions: Zirconia-reinforced lithium silicate showed superior edge chipping resistance among the tested materials, while resin nanoceramic showed the lowest. Hybrid ceramics, including resin nanoceramics and PICNs, should be used with caution in high-load areas, as their lower edge chipping resistance increases the risk of marginal failure.

کلیدواژه ها:

Ceramics ، Computer-Aided Design ، Dental restoration ، fracture strength ، Hybrid ceramic ، Zirconia