Effects of Horizontal Width and Thickness of Zirconia Crown Margin on Fracture Strength

초록

Purpose: The purpose of this study was to evaluate the fracture strength of zirconia crowns of varying margin thicknesses. Materials and Methods: A model of the maxillary right first molar (Nissin, Kyoto, Japan) was prepared to create an abutment, which was fabricated into a metal die via a 3D metal printer. CAD software (exocad GmbH, Darmstadt, Germany) was used to design the crowns. A total of eight groups were generated: initially separated by margin thickness (0.1 mm and 0.8 mm), and then further divided by horizontal margin widths of 0.1 mm, 0.2 mm, 0.3 mm, and 0.4 mm. Zirconia crowns were designed for each group’s working models (N=10). Crown fracture strength was assessed using a universal testing machine (Shimadzu, Kyo to, Japan), applying a compressive load until fracture and recording the maximum load. A scanning electron microscope was employed to observe fracture patterns. Fracture strength results were analyzed using one-way ANOVA, with the Tukey HSD test applied for post-hoc analysis (α=0.05). Results: Zirconia crown fracture strength significantly improved with increased hor izontal margin width (P<0.001). However, margin thickness had no statistically significant effect on fracture strength (P=0.513). Conclusion: Optimizing the horizontal margin width of zirconia crowns enhances their durability and performance. [J Korean Dent Sci. 2024;17(4):210-20]

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