Effect of Occlusal Surface Hole with Different Diameters on Fracture Loads of Implant-supported Full Zirconium Crown

doi:10.13701/j.cnki.kqyxyj.2025.05.006

Abstract

Abstract: Objective: To compare the fracture loads of two types of implant-supported full zirconium crowns (IFZC) with occlusal surface hole at different diameters. Methods: Eighty molar full zirconium crowns (FZCs) with 4 types of occlusal surface holes were fabricated with 2 types of zirconia by computer aided design and computer aided manufacturing (CAD/CAM), and were divided into 8 groups: Xuncai zirconia without hole (X0) and with hole of 1 mm-diameter (X1), 2 mm-diameter (X2), and 3 mm-diameter (X3), Saici zirconia without hole (S0) and with hole of 1 mm-diameter (S1), 2 mm-diameter (S2), and 3 mm-diameter (S3). After cemented to identically milled titanium abutments, all specimens were subjected to a load-to-fracture test in a universal testing machine. The fracture loads (FL) of each group were analyzed by two-way ANOVA test. Results: There was no significant difference among groups with different types of occlusal surface hole. The FL of S groups (S0, S1, S2, S3) were significant higher than those of X groups (X0, X1, X2, X3) (P<0.001), and there was no counteraction between zirconia material and the holes with different diameter (P＞0.05). Conclusion: A 1 mm-, 2 mm-, or 3 mm-diameter-hole on the occlusal surface might not reduce the fracture resistance of IFZCs, which was not affected by the strength of zirconia material.

Key words: occlusal hole, implant-supported ceramic crown, full zirconium crown, fracture resistance

LIAN Songfeng, TIAN Jumei, CAI Kuncan, CHEN Chi. Effect of Occlusal Surface Hole with Different Diameters on Fracture Loads of Implant-supported Full Zirconium Crown[J]. Journal of Oral Science Research, 2025, 41(5): 391-394.

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