Fracture Resistance and Failure Mode of Polyethylene Fiber-reinforced Resin-based Restorations in Structurally Compromised Premolars: an in Vitro Study.
L F Canobra, E Parra-Gatica, V Sanhueza, C Medina, M Wendler
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引用次数: 0
Abstract
Objective: To evaluate the effect of polyethylene fiber-reinforcement on the fracture resistance and fracture mode of extensive resin-based composite (RBC) restorations in structurally compromised maxillary premolars.
Methods and materials: Maxillary premolars (54) with specific dimensions and extracted for orthodontic reasons were used. Following mesio-occluso-distal (MOD) cavity preparation and endodontic access, teeth were randomly assigned to one of three restorative protocols (n=18): RBC applied incrementally (I) or reinforced with woven polyethylene fibers (Ribbond) placed horizontally (H) or U-shaped (U). Restored teeth were stored for 45 days in distilled water at 37°C and then loaded monotonically until fracture. Half of the specimens in each group received axial loading (A) and the other half was loaded paraxially (PA). Fracture load data was assessed using two-way analysis of variance and Tukey's post hoc test for multiple comparisons (α=0.05). The fracture initiation and propagation path were analyzed using stereomicroscopy and scanning-electron microscopy.
Results: No significant differences were observed for the fracture strength among loading configurations, except for groups IA (825 N) and HA (553 N). Fracture initiated and propagated mainly at and through the RBC restoration in the I group, whereas a shift to the interface was observed in both polyethylene fiber-reinforced groups. Blocking and bridging of cracks were identified around the fibers, especially in specimens of group U.
Conclusions: Incorporation of woven polyethylene fibers to reinforce extensive MOD resin-based composite restorations on endodontically treated premolars reduced the occurrence of cohesive fractures in the restorative material but was unable to increase the fracture resistance of the affected teeth.
目的评估聚乙烯纤维加固对结构受损的上颌前磨牙广泛树脂基复合材料（RBC）修复体的抗折性和折断模式的影响：采用因正畸原因拔出的具有特定尺寸的上颌前磨牙（54 颗）。在中-咬合-远端（MOD）牙洞预备和牙髓通路之后，牙齿被随机分配到三种修复方案之一（n=18）：增量式 RBC（I）或水平放置（H）或 U 型（U）的聚乙烯纤维编织物（Ribbond）加固。修复后的牙齿在 37°C 的蒸馏水中保存 45 天，然后单调加载直至断裂。每组中一半试样接受轴向加载（A），另一半试样接受顺轴加载（PA）。断裂荷载数据采用双向方差分析和 Tukey 后检验进行多重比较（α=0.05）。使用体视显微镜和扫描电子显微镜分析了断裂的发生和传播路径：除 IA 组（825 牛顿）和 HA 组（553 牛顿）外，其他加载配置的断裂强度无明显差异。在 I 组中，断裂主要在 RBC 修复处开始并通过 RBC 修复处扩展，而在聚乙烯纤维增强的两组中，都观察到断裂向界面转移。在纤维周围发现了裂纹的阻塞和桥接，尤其是在 U 组试样中：结论：在牙髓治疗的前臼齿上加入聚乙烯编织纤维来加固大面积的 MOD 树脂基复合修复体，可以减少修复材料内聚性裂纹的发生，但无法提高患牙的抗裂性。
期刊介绍：
Operative Dentistry is a refereed, international journal published bi-monthly and distributed to subscribers in over 50 countries. In 2012, we printed 84 articles (672 pages). Papers were submitted by authors from 45 countries, in the categories of Clinical Research, Laboratory Research, Clinical Techniques/Case Presentations and Invited Papers, as well as Editorials and Abstracts.
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