摘要
目的:研究纤维桩直径和肩领高度对桩核修复体抗折能力的交互影响。方法:60颗上颌中切牙切除牙冠部分,按邻面釉-牙骨质界上残余牙体高度分为0 mm、1 mm、2 mm、3 mm四组(n=15)。按照常规桩核修复技术,使用Macro Lock纤维桩(2#,3#和4#)制作试样。采用静态折裂实验获取各试样的最大折裂力;通过断口图像分析试样折裂情况。双因素方差分析肩领高度和纤维桩直径对试样抗折能力的影响。结果:双因素方差分析结果显示肩领高度和纤维桩直径存在明显交互作用(P=0.006)。在0mm和1mm组,增加纤维桩直径能显著提高试样抗折能力;在2mm组,使用2#和3#纤维桩时,试样抗折力无显著差异;在3mm组,不同直径纤维桩对试样抗折力均无显著影响。结论:纤维桩直径对于桩核修复体抗折能力的影响随着肩领高度增加而减弱。增加肩领高度能有效提高桩核修复体抗折能力。
Objective：To explore the interaction effects of ferrule height and fiber post dimension on the fracture resistance of endodontically treated teeth.Methods：Sixty endodontically treated incisors were randomly assigned into four groups（n=15）,and decoronated at 0 mm,1 mm,2 mm,and 3 mm to the proximal cemento-enamel junction（CEJ）.The roots were restored using fiber posts with various dimensions.All specimens were subjected to fracture failure tests,loaded with an incremental force at an angle of 45°to the long axis of the roots.Fracture failure loads were recorded and analyzed using two-way analysis of variance（ANOVA）,followed by the Tukey＇s post hoc comparisons.The fracture modes were investigated using fractographic analysis.Results：The interaction effects of ferrule height and post dimension were detected（P=0.006）.Post dimension significantly influenced the fracture failure loads of specimens with 0mm and 1 mm ferrule.No significant difference was found between 2# and 3#posts in 2mm ferrule,or among all the dimensions of posts in 3mm ferrule.Increasing of ferrule height decreased the probability of the debonding at the core/dentin interface.Conclusion：The effect of post dimension on fracture resistance decreases with the increasing of ferrule height.Increasing of ferrule height potentially postpones the processing of the ultimate fracture failure.
作者
李清
徐东选
LI Qing XU Dong- xuan(Hubei- MOSTKLOS ＆ KLOBM , School and Hospital of Stomatology , Wuhan University, Wuhan , 430079, Chin)
出处
《口腔医学研究》
CAS
CSCD
北大核心
2016年第10期1015-1019,共5页
Journal of Oral Science Research
基金
国家自然科学基金(编号:81100784)
关键词
交互作用
肩领高度
桩直径
抗折能力
桩核修复体
Interaction effect
Ferrule height
Post dimension
Fracture resistance
Post-restored teeth
