Comparison of Fracture Loads between Cast and Milled Titanium Ceramic Crowns and Base Metal Ceramic Crowns.

doi:10.13701/j.cnki.kqyxyj.2017.08.021

Abstract

Abstract: Objective: To compare the fracture loads of metal ceramic crowns (MCCs) composed of cast and milled titanium and MCCs composed of base metal. Methods: Thirty premolar MCCs were fabricated with 3 different metal copings: cast nickel-chromium alloy (Ni group), milled titanium (T1 group) and cast titanium (T2 group). Various geometric dimensions of the MCCs were tested with a laboratory scanner and digital measurement software and then adjusted. All final data were collected and statistically analyzed for confirming the homogeneity among groups. After cemented to identically milled titanium dies, all specimens were subjected to an occlusal loading axially in an universal testing machine until ceramic fracture occurred to measure the fracture load (F). The fractures were characterized using stereomicroscope. The F values were analyzed using one-way ANOVA test. Results: The mean fracture loads were (2348 ± 441)N for Ni group, (2144 ± 501)N for T1 group, and (1823 ± 576)N for T2 group, respectively. No significant differences were observed. Most of the fractures were confined to the palatal third. The chief failure mode for Ni and T1 groups was mixed failure, but it was adhesive failure for T2 group. Conclusion: The fracture resistance of titanium-based MCCs is similar to that of Ni-Cr alloy containing MCCs, and therefore titanium-based MCCs may be a potential alternative to conventional MCCs.

Key words: Titanium , Ni-Cr, Metal ceramic crown , Fracture load

CLC Number:

R783.1

LIAN Song-feng, LIN Jing-kai, CAI Kun-can, ZHANG Yan-xiang.. Comparison of Fracture Loads between Cast and Milled Titanium Ceramic Crowns and Base Metal Ceramic Crowns.[J]. Journal of Oral Science Research, 2017, 33(8): 885-888.

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