广东牙病防治Issue(11)：575-577,3.
氢氟酸处理时间对可切削玻璃陶瓷粘接后断裂强度的影响
The influence of hydrofluoric acid etching time on fracture strength of cemented machinable glass ceramic
摘要
Abstract
Objective To evaluate the fracture strength of cemented machinable glass ceramic after being etched with hydrofluoric acid for different time periods and provide guides for clinical hydrofluoric etching. Methods 50 human mo-lars were collected, and occlusal enamel was removed. Sirona CEREC Blocs were processed into plate-shape, divided in-to 5 groups and etched with hydrofluoric acid for 30 s ( Group B) , 60 s ( Group C) , 120 s ( Group D) and 240 s ( Group E) respectively, while Group A remained untreated. Then all specimens were cemented onto the collected molars with Variolink® N cement system. Fracture loads were measured with a universal testing machine. The results were analyzed by one-way ANOVA and LSD test. Results Fracture loads of Group A to E were ( 1 774 ± 153) N, ( 2 190 ± 180) N, ( 2 336 ± 173) N, ( 2 097 ± 174) N, ( 2 075 ± 202) N respectively. Significant differences of fracture load were observed among five groups ( F=13. 5, P<0. 001) . LSD test showed that fracture load of Group A was lower than the other groups and fracture loads of Group D and E were significantly lower than Group C ( P<0. 05) . Conclusion Hydrofluoric acid etching increased fracture strength of cemented Sirona CEREC Blocs specimens, but fracture load decreased after being etched for more than 120 s, which was still higher than those untreated.关键词
离体牙/断裂强度/可切削玻璃陶瓷/氢氟酸Key words
Isolated tooth/Fracture strength/Machinable glass ceramic/Hydrofluoric acid分类
医药卫生引用本文复制引用
黄宏,张鹏,黎日照..氢氟酸处理时间对可切削玻璃陶瓷粘接后断裂强度的影响[J].广东牙病防治,2015,(11):575-577,3.基金项目
佛山市院市合作项目(2014HT10008) （2014HT10008）
