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  • Title: [Fracture analyses of casting framework removable partial dentures].
    Author: Zhu YH, Zhang B, Liu YH, Qin F, Li HF, Zheng YF.
    Journal: Beijing Da Xue Xue Bao Yi Xue Ban; 2012 Feb 18; 44(1):80-3. PubMed ID: 22353906.
    Abstract:
    OBJECTIVE: To compare the clinical fracture rates of removable partial denture (RPD) made of titanium with that of Co-Cr alloy, to analyze the fracture modes and reasons of two kinds of metal frameworks, and to explore the effect of defects on the fracture process. METHODS: Following totally 30 618 RPDs made by titanium and by Co-Cr alloy, the fracture rates in 18-month were calculated individually. The fractured surfaces of failed RPDs were examined by fractography investigations using a field emission scanning electron microscope to disclose the fracture mode and damage character. The energy-dispersive X-ray spectroscopy analysis was performed to examine the chemical compositions. RESULTS: The fracture rate of titanium framework was 1.75%, comparing with 0.57% of Co-Cr alloy framework. The reasons included teeth preparing, framework design, and defects during casting. The fracture modes of titanium and Co-Cr alloy framework performed toughness fracture character. The fissures were found in both titanium and Co-Cr alloy frameworks, and pores were detected in titanium frameworks. CONCLUSION: The higher fracture rate of titanium framework is related to the defects during casting.
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