Author/Editor		Oblak, Čedomir; Kocjan, Andraž; Jevnikar, Peter; Kosmač, Tomaž
Title		The effect of mechanical fatigue and accelerated ageing on fracture resistance of glazed monolithic zirconia dental bridges
Type		članek
Publication year		2017
Volume		str. str.
ISSN		0955-2219 - Journal of the European Ceramic Society
Language		eng
Abstract		The fracture resistance of glazed four-unit posterior dental bridges after mechanical fatigue testing and artificial ageing was evaluated. Thirty identical monolithic bridges were fabricated from translucent zirconia and divided into three groups of ten. The first group was monotonically loaded to fracture; the second group was dynamically loaded in water (0-300 N, 10[sup]6 cycles) prior to fracture, while the third group was first subjected to accelerated ageing (in a diluted acetic acid solution at 134⁰C for 12 h), then to mechanical fatigue and finally monotonically loaded to fracture. Two tested bridges did not survive 106 cycles of dynamic loading, one in Group 2 and one in Group 3. Mean monotonic fracture loads (N) were:Group 1: 547.3 +- 66.3, Group 2 (n = 9): 465.2 +- 118.0, and Group 3 (n = 9): 408.8 +- 58.9. According to the fractographic analysis the glaze embrittlement during artificial ageing and the stress corrosion during fatigue loading are proposed to be responsible for the reduced fracture resistance.
Keywords		cirkonij odpornost preloma zirconia fracture resistance mechanical fatigue