Fatigue Damage Modes of Bilayered Zirconia and Alumina Dental Composites
Bi-layer all-ceramic dental crowns comprise an inner core made of alumina or zirconia and an outer porcelain shell. The veneer safe from damage is mainly depended on the properties of core materials due to the poor strength and toughness of porcelain. The fracture modes and crack transformation of zirconia/porcelain and alumina/porcelain bi-layer composites reveal the potential feasibilities of improving the fatigue life of all-ceramic restorations. The failure modes of bi-layer composites were confirmed under cyclic spherical fatigue loading by dynamic microcosmic observation. Crack modes and evolvement of bi-layered composites were explored inflecting with fatigue load, cycles, frequency and water environment. Microcosmic morphology of the samples was observed by high depth of field stereomicroscope to determine degree and modes of fatigue damage. The appearance of cone cracks of porcelain surface was almost consistent in both of zirconia and alumina bi-layer composites. However, the pattern and process of the damage are different under cycle fatigue load. Furthermore, process of fatigue damage of bi-layer composites were observed to failure rapidly under water environment in both of zirconia and alumina bi-layer composites.
Linjia Zhu Yihong Liu Hailan Feng Huijuan Chen Qinghui Zhang Yan Qiu Yiwang Bao
School and Hospital of Stomatology, Peking University, Beijing 100081, China Beijing University of Chinese Medicine Dongfang Hospital, Beijing 100011, China State Key Lab of Green Building Materials, China Building Materials Academy, Beijing 110024, China
国际会议
长沙
英文
35-38
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）