Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up
作者： Per Vult von Steyern , Eddie Nilsson , Christel Larsson , Marko Drazic
DOI: 10.3109/23337931.2015.1057825
关键词:
摘要: Objective: The main aim of this study was to compare fracture load and mode yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) metal-ceramic (MC) molar crowns using a modified test set-up produce fractures similar those seen in vivo, i.e. the veneering material rather than complete fractures. Materials methods: 13 high-noble-alloy MC Y-TZP veneered with porcelain were manufactured. artificially aged before final fracture. Load applied 7 mm diameter steel ball exerting force on cusps stresses directed toward core-veneer interface. Fracture surface analysis performed light- scanning electron microscopy. Results: design produced withstood significantly (p > 0.001) higher loads (mean 2155 N) 1505 crowns, yet both endure sufficient for predictable clinical use. differed between Y-TZP. exhibited involving interface but without core exposure. One crown suffered fracture, all others except one displayed Conclusions: produces found vivo may be useful evaluate different systems, metals ceramics. confirms suggestions from previous studies weaker bond compared crowns.
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