Lang Reinhold, Rosentritt Martin, Behr Michael, Handel Gerhard
Department of Prosthodontics, University Clinic, University of Regensburg, Germany.
Int J Prosthodont. 2003 Jul-Aug;16(4):381-4.
The aim of this study was to compare the fracture strength of several commercial interim fixed partial denture (FPD) materials in an artificial oral environment.
Twenty identical three-unit FPDs of the PMMA materials Trim and Cronsin and the composite-based materials Protemp 3 Garant, Protemp Garant, Luxatemp, and Tempofit were cemented on Co-Cr alloy dies. Ten FPDs of each material were stored for 14 days in distilled water and artificially aged. Ten FPDs of each material were stored for 24 hours in distilled water as a control group. Fracture resistance was determined using a testing machine.
The tested interim materials showed initial fracture values between 484 and 1,081 N. During artificial aging, the PMMA FPDs failed because of irreversible deflection. All Tempofit FPDs, four Luxatemp FPDs, two Protemp Garant FPDs, and one Protemp 3 Garant FPD failed because of fracture during artificial aging. The remaining FPDs showed fracture values of 759 N (Luxatemp), 772 N (Protemp Garant), and 956 N (Protemp 3 Garant).
The PMMA FPDs and the composite Tempofit FPDs showed poor stability during artificial aging, whereas the highest strength values in combination with low fracture rates were found for the Protemp 3 Garant composite FPDs.
本研究的目的是在人工口腔环境中比较几种市售临时固定局部义齿（FPD）材料的断裂强度。
将20个相同的由聚甲基丙烯酸甲酯材料Trim和Cronsin以及复合基材料Protemp 3 Garant、Protemp Garant、Luxatemp和Tempofit制成的三单位FPD粘结在钴铬合金铸模上。每种材料的10个FPD在蒸馏水中储存14天并进行人工老化。每种材料的10个FPD在蒸馏水中储存24小时作为对照组。使用试验机测定抗断裂性。
测试的临时材料的初始断裂值在484至1081 N之间。在人工老化过程中，聚甲基丙烯酸甲酯FPD因不可逆变形而失效。所有Tempofit FPD、4个Luxatemp FPD、2个Protemp Garant FPD和1个Protemp 3 Garant FPD在人工老化过程中因断裂而失效。其余FPD的断裂值分别为759 N（Luxatemp）、772 N（Protemp Garant）和956 N（Protemp 3 Garant）。
聚甲基丙烯酸甲酯FPD和复合Tempofit FPD在人工老化过程中稳定性较差，而Protemp 3 Garant复合FPD的强度值最高且断裂率较低。
