Department of Prosthetic Dentistry and Dental Materials Sciences, Dental School and Clinics, Saarland University, Homburg Campus, Bldg. 71.2, 66421 Homburg/Saar, Germany.
Dent Mater J. 2011;30(1):109-14. doi: 10.4012/dmj.2010-069. Epub 2011 Jan 26.
The aim of the study was to evaluate the influence of fatigue and cementation mode on the fracture behaviour of endodontically treated bovine incisors restored with fiber-reinforced-composite (FRC) posts and crowns. Forty-eight endodontically treated incisors were restored with FRC posts, composite build-ups, and cast crowns. In 16 teeth, each of the posts were cemented conventionally with KetacCem (3M Espe) or adhesively with Panavia F (Kuraray) or RelyXUniCem (3M Espe). One-half of the specimens in each group were subjected to thermal cycling with 10,000 cycles at 5-55°C and mechanical aging, loading the specimens in 1,200,000 cycles with 50 N. Fracture resistance was determined by loading the specimens until fracture at an angle of 45°. The loading test showed that cementation mode and fatigue testing had an influence on the load bearing capability. Before fatigue testing no statistically significant differences between the different cementation modes could be detected. After fatigue testing, conventionally cemented FRC posts lead to statistically significant higher fracture loads compared to adhesively luted posts. Most specimens fractured in a favourable way, independent from the type of cementation.
本研究旨在评估疲劳和粘结模式对纤维增强复合材料（FRC）桩核修复的根管治疗后牛切牙断裂行为的影响。48 颗根管治疗后的切牙用 FRC 桩、复合树脂堆垛和铸造冠修复。在 16 颗牙齿中，每颗桩分别用 KetacCem（3M Espe）常规粘结或用 Panavia F（Kuraray）或 RelyXUniCem（3M Espe）粘结。每组的一半样本在 5-55°C 下进行 10,000 次热循环和机械老化，用 50 N 的载荷对样本进行 1,200,000 次循环加载。通过以 45°角加载样本直至断裂来确定断裂阻力。加载试验表明，粘结模式和疲劳试验对承载能力有影响。在疲劳试验之前，不同粘结模式之间没有统计学上的显著差异。疲劳试验后，与粘结桩相比，常规粘结的 FRC 桩导致的断裂载荷明显更高。大多数样本以有利的方式断裂，与粘结类型无关。
