Salameh Ziad, Sorrentino Roberto, Ounsi Hani F, Sadig Walid, Atiyeh Fadi, Ferrari Marco
Department of Research, School of Dentistry, Lebanese University, Beirut, Lebanon.
J Endod. 2008 Jul;34(7):842-6. doi: 10.1016/j.joen.2008.03.025. Epub 2008 May 16.
The aim of this study was to compare the fracture resistance and failure pattern of endodontically treated maxillary incisors restored using composite resin with or without fiber-reinforced composite (FRC) posts under different types of full-coverage crowns. The null hypothesis tested was that fracture resistance and the failure pattern of these teeth were not affected by the use of FRC posts or by the type of full-coverage crown. One hundred twenty maxillary incisors were endodontically treated and divided into 4 groups of 30 each. Each group was divided into two subgroups: restoration with or without fiber post. PFM crowns were placed in group 1, Empress II crowns in group 2, SR Adoro crowns in group 3, and Cercon crowns in group 4. Fracture tests were performed by loading specimens to fracture. Data were analyzed with two-way analysis of variance (alpha = 0.05). The type of crown was not a significant factor affecting fracture resistance (p = 0.4), whereas the presence of a post was (p = 0.001). Both the presence of post and the type of crown had a significant influence on the proportion of restorable versus unrestorable fractures. Although prosthodontics textbooks do not generally advocate the placement of fiber posts in endodontically treated incisors, the results of this study indicate that the use of fiber posts in such teeth increases their resistance to fracture and improves the prognosis in case of fracture.
本研究的目的是比较在不同类型的全冠修复下，使用复合树脂修复且有无纤维增强复合材料（FRC）桩核的根管治疗上颌切牙的抗折性和失败模式。所检验的无效假设是这些牙齿的抗折性和失败模式不受FRC桩核的使用或全冠类型的影响。120颗上颌切牙接受根管治疗并分为4组，每组30颗。每组再分为两个亚组：有或无纤维桩核修复。第1组放置烤瓷熔附金属全冠，第2组放置铸瓷全冠，第3组放置SR Adoro全冠，第4组放置Cercon全冠。通过对标本加载直至折断进行抗折试验。数据采用双向方差分析（α = 0.05）进行分析。全冠类型不是影响抗折性的显著因素（p = 0.4），而桩核的存在是（p = 0.001）。桩核的存在和全冠类型对可修复性骨折与不可修复性骨折的比例均有显著影响。尽管口腔修复学教科书一般不主张在根管治疗的切牙中放置纤维桩核，但本研究结果表明，在此类牙齿中使用纤维桩核可增加其抗折性，并改善骨折情况下的预后。
