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首页> 外文期刊>The Journal of Prosthetic Dentistry >The effect of different reinforcements on the fracture toughness of materials for interim restorations.
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The effect of different reinforcements on the fracture toughness of materials for interim restorations.

机译：不同的增强材料对临时修复材料的断裂韧性的影响。

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STATEMENT OF PROBLEM: Fracture of an interim fixed partial denture (FPD) may jeopardize the success of the interim prosthodontic treatment phase and cause patient discomfort. PURPOSE: The purpose of this study was to compare the fracture toughness of a polymethyl methacrylate (PMMA) resin and a bis-acryl composite (BAC) resin reinforced with stainless steel wire, glass fiber, and polyethylene fiber. MATERIAL AND METHODS: Four groups (n=13) of each of the 2 materials were prepared for the single-edge notch 3-point-bending test. Three groups had the different reinforcements, and the group without reinforcement served as the control. Using a universal testing machine, peak load to fracture was recorded and fracture toughness (K(IC)) was calculated in MNm(-1.5). Median K(IC) values were compared by means of nonparametric ANOVA (Kruskal-Wallis test, alpha=.05). RESULTS: For the controls, the fracture toughness for PMMA resin (K(IC)=27.9) was significantly lower (P<.01) than for BAC resin (K(IC)=31.2). Glassfibers and stainless steel wire reinforcements produced significantly higher fracture toughness for both PMMA (K(IC)=34.4, P<.01, and K(IC)=39.0, P<.001, respectively) and BAC resin (K(IC)=42.3, P<.001, and K(IC)=44.0, P<.001, respectively), but the polyethylene fibers did not (K(IC)=25.8, P>.10, for PMMA resin and K(IC)=33.1, P>.10, for BAC resin). There was no significant difference between the fracture toughness of the wire and glass fiber reinforcements for both interim materials (P>.10 in both instances). CONCLUSIONS: Of the 3 reinforcement methods evaluated, wire and glass fiber reinforced the PMMA and BAC resin materials best.
机译：问题陈述：临时固定局部义齿（FPD）的骨折可能会危及临时义齿治疗阶段的成功并导致患者不适。目的：本研究的目的是比较用不锈钢线，玻璃纤维和聚乙烯纤维增强的聚甲基丙烯酸甲酯（PMMA）树脂和双丙烯酸复合材料（BAC）树脂的断裂韧性。材料与方法：两种材料的每组分别分为四组（n = 13）用于单边缺口三点弯曲测试。三组具有不同的增援，而无增援的组作为对照组。使用通用测试机记录断裂的峰值载荷，并以MNm（-1.5）计算断裂韧性（K（IC））。中位数K（IC）值通过非参数方差分析进行比较（Kruskal-Wallis检验，α= .05）。结果：对于对照组，PMMA树脂（K（IC）= 27.9）的断裂韧性明显低于BAC树脂（K（IC）= 31.2）（P <.01）。对于PMMA（分别为K（IC）= 34.4，P <.01和K（IC）= 39.0，P <.001）和BAC树脂（K（IC）），玻璃纤维和不锈钢丝增强材料的断裂韧性明显更高。分别为42.3，P <.001和K（IC）= 44.0，P <.001），但对于PMMA树脂和K（IC），聚乙烯纤维则没有（K（IC）= 25.8，P> .10） ）= 33.1，对于BAC树脂，P> 0.10两种中间材料的钢丝和玻璃纤维增​​强材料的断裂韧性之间均无显着差异（两种情况下均P> 0.1）。结论：在评估的三种增强方法中，金属丝和玻璃纤维增​​强了PMMA和BAC树脂材料的最佳性能。

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