Leevailoj C, Platt J A, Cochran M A, Moore B K
School of Dentistry, Indiana University, Indianapolis, IN, USA.
J Prosthet Dent. 1998 Dec;80(6):699-707. doi: 10.1016/s0022-3913(98)70058-7.
Anecdotal reports based on clinical observation have recently linked resin-modified glass ionomer luting agents with postcementation fracture of all-ceramic crowns.
This study evaluated the fracture incidence of In-Ceram and VitaDur Alpha porcelain jacket all-ceramic crowns cemented with 5 luting agents (Fuji I, Fuji Plus, Vitremer, Advance, and Panavia 21) during 2 months storage in 0.8% NaCl solution.
Fifty human maxillary premolar teeth were prepared for each ceramic system and divided into 5 subgroups of 10 teeth to be cemented with 5 luting cements. Specimens were observed for fracture lines and crack initiation at storage times up to 2 months. Incidence of fracture was analyzed with Fisher's Exact test. Specimens that did not fracture during storage were loaded in compression to failure. Failure loads were analyzed by analysis of variance and multiple pairwise comparisons.
Only all-ceramic crowns cemented with Advance cement fractured during the 2-month observation period, and porcelain jacket crowns were found to fracture earlier and more frequently than In-Ceram crowns. Cracks initiated at the crown margin, and multiple crack lines were found as the time of storage increased. In-Ceram crowns were significantly stronger (140 +/- 21.5 kg) than porcelain jacket crowns (98.6 +/- 17.8 kg) at P <.05. For In-Ceram crowns, cement type did not influence failure load while for porcelain jacket crowns, Fuji I (110.5 kg) was significantly higher than Vitremer (86.6 kg) at P <.05.
For the cements studied, only crowns cemented with Advance cement demonstrated fracture during 2-month storage. Results for the true resin-modified glass ionomer cements do not support anecdotal reports of fracture of all-ceramic crowns cemented with these materials.
基于临床观察的轶事报道最近将树脂改性玻璃离子水门汀粘结剂与全瓷冠粘结后骨折联系起来。
本研究评估了用5种粘结剂（Fuji I、Fuji Plus、Vitremer、Advance和Panavia 21）粘结的In-Ceram和VitaDur Alpha烤瓷全瓷冠在0.8%氯化钠溶液中储存2个月期间的骨折发生率。
为每个陶瓷系统准备50颗人上颌前磨牙，并分为5个亚组，每组10颗牙，分别用5种粘结水门汀粘结。观察标本在长达2个月的储存时间内的裂纹线和裂纹起始情况。用Fisher精确检验分析骨折发生率。在储存期间未骨折的标本进行压缩加载直至破坏。通过方差分析和多重成对比较分析破坏载荷。
在2个月的观察期内，仅用Advance水门汀粘结的松全瓷冠发生骨折，发现烤瓷冠比In-Ceram冠更早、更频繁地发生骨折。裂纹始于冠边缘，随着储存时间的增加发现有多条裂纹线。在P<0.05时，In-Ceram冠（140±21.5kg）明显比烤瓷冠（98.6±17.8kg）更强。对于In-Ceram冠，水门汀类型不影响破坏载荷，而对于烤瓷冠，在P<0.05时，Fuji I（110.5kg）明显高于Vitremer（86.6kg）。
对于所研究的水门汀，仅用Advance水门汀粘结的冠在2个月储存期间出现骨折。真正的树脂改性玻璃离子水门汀的结果不支持用这些材料粘结的全瓷冠骨折的轶事报道。
