Effect of contact stress on the cycle-dependent wear behavior of ceramic restoration.pdfVIP

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Effect of contact stress on the cycle-dependent wear behavior of ceramic restoration.pdf

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Effect of contact stress on the cycle-dependent wear behavior of ceramic restoration.pdf

Journal of the mechanical behavior of biomedical materials 68 (2017) 16–25 Contents lists available at ScienceDirect Journal of the Mechanical Behavior of Biomedical Materials journal homepage: /locate/jmbbm Research Paper E?ect of contact stress on the cycle-dependent wear behavior of ceramic restoration Jiawen Guoa, Ding Lib, Haijing Wangc, Yanwei Yanga, Liying Wanga, Delin Guana, Yinong Qiua, Lin Heb,?, Shaofeng Zhangd,? a Department of Stomatology, Lanzhou General Hospital, Lanzhou Command of PLA, Lanzhou, Gansu, China b State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian, China c Oral Biosciences, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong d State Key Laboratory of Military Stomatology National Clinical Research Center for Oral Diseases Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi’an, China MARK ARTICLE INFO Keywords: Wear Porcelain Metal ceramic crowns Contact stress Temporal development Chewing simulation ABSTRACT Aim: Ceramic restoration experiences the non-linear wear process during the chewing simulation, which contains running-in, steady and severe wear stages. However since various levels of contact stress may be applied on the occlusal surface during chewing, the cycle-dependent wear behaviors of ceramic crowns may di?er. The aim of this study was to investigate the e?ect of contact stress on the development of wear behavior, as tested in a chewing simulator. Materials and methods: Thirty-six anatomical metal-ceramic crowns using Ceramco III as the veneering porcelain were randomly assigned to two groups based on the contact stress applied in the wear testing. Stainless steel balls served as antagonists. The specimens were dynamically loaded in a chewing simulator up to 2.4×106 loading cycles, with additional thermal cycling between 5 and 55℃. For