Kapri Surg Cdr Anita
Department of Prosthodontics, Army Dental Centre (R and R), Delhi Cantonment, New Delhi, India.
J Indian Prosthodont Soc. 2015 Apr-Jun;15(2):142-7. doi: 10.4103/0972-4052.155037.
The interim restoration is an important phase in fixed prosthodontic therapy. It should provide sufficient durability to withstand the forces of mastication. A fractured interim restoration is damaging to the prosthodontic care and may lead to an unscheduled appointment for repair. Several attempts have been made to reinforce interim fixed partial dentures (FPDs). These have included the use of metal wire, a lingual cast metal reinforcement, a processed acrylic resin interim restoration, and different types of fibers, e.g., carbon, polyethylene, nylon and glass. These fibers can be placed in the occlusal, middle or cervical thirds in the FPD. There is no scientific data to evaluate the effect of fiber placement methods on the fracture resistance of clinical interim FPDs.
Hence this study was designed to evaluate fracture load values of interim FPDs with different locations of fiber reinforcement.
30 interim FPD samples with polymethyl methacrylate (PMMA) reinforced with fibers at three different locations mainly occlusal, cervical and middle (10 samples each) were fabricated using a metal FPD on a master die. They were tested for fracture resistance in universal testing machine.
The fracture resistance was recorded and is tabulated and analyzed statistically. The results showed that the placement of the reinforcement in the occlusal third of the pontic resulted in higher fracture resistance which was significantly higher (P < 0.05) than all other locations.
The occlusal third of the pontic region from mesial to the distal end of the connector is the best site of placement of the fiber for reinforcing the PMMA interim restorative resin.
临时修复是固定义齿修复治疗中的一个重要阶段。它应具备足够的耐久性以承受咀嚼力。临时修复体折断会对义齿修复治疗造成损害，并可能导致计划外的修复预约。人们已经进行了多种尝试来增强临时固定局部义齿（FPD）。这些尝试包括使用金属丝、舌侧铸造金属增强体、加工后的丙烯酸树脂临时修复体以及不同类型的纤维，如碳纤维、聚乙烯纤维、尼龙纤维和玻璃纤维。这些纤维可放置在FPD的咬合面、中间或颈部三分之一处。目前尚无科学数据来评估纤维放置方式对临床临时FPD抗折性能的影响。
因此，本研究旨在评估不同纤维增强位置的临时FPD的抗折负荷值。
在主模型上使用金属FPD制作30个临时FPD样本，其中聚甲基丙烯酸甲酯（PMMA）在三个不同位置（主要是咬合面、颈部和中间，各10个样本）用纤维增强。在万能试验机上对它们进行抗折性能测试。
记录抗折性能并制成表格进行统计分析。结果表明，在桥体的咬合面三分之一处进行增强可获得更高的抗折性能，且显著高于所有其他位置（P < 0.05）。
从连接体近中端到远端的桥体区域咬合面三分之一处是放置纤维增强PMMA临时修复树脂的最佳位置。
