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首页> 外文期刊>The Journal of Prosthetic Dentistry >Retention of provisional crowns fabricated from two materials with the use of four temporary cements.
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Retention of provisional crowns fabricated from two materials with the use of four temporary cements.

机译：保留使用两种材料和四种临时胶合剂制成的临时牙冠。

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STATEMENT OF PROBLEM: Practitioners often choose resin materials and temporary cements with little understanding about their effect on provisional crown retention. PURPOSE: This study evaluated the retention of provisional restorations made with 2 materials and cemented with 4 temporary cements. METHODS AND MATERIAL: Recently extracted molars were prepared with a flat occlusal surface, 4-mm axial length and 20-degree angle of convergence. Specimens were distributed into equivalent groups. Provisional crowns were constructed for each preparation with polymethyl methacrylate (Temporary Bridge Resin) or bis-acrylic composite (Protemp Garant) and later cemented with Temp-Bond, Temp-Bond NE, Temrex, and an experimental calcium hydroxide temporary cement. A second group with Temrex was evaluated using half the recommended liquid. A cementing force of 2.5 kg for 5 minutes was used. After initial bench set followed by 24 hours in room temperature water, the crowns were removed with an Instron mechanical testing machine at 0.5 mm/min. A 2-factor ANOVA was used with alpha=.05 (n = 10). Mode of debonding was analyzed with a nonparametric chi-square test of association. RESULTS: Mean dislodgment stresses ranged from 670 to 1072 kPa for polymethyl methacrylate crowns and 554 to 884 kPa for those made of composite. Differences were nearly significant for the type of provisional material (P =.061) and the cross-product interaction (P =.376) was not significant, whereas there were significant differences among the cements (P =.002) and the mode of debonding (P =.0034). CONCLUSIONS: Excluding Temp-Bond to eliminate a cross-product interaction demonstrated that the polymethyl methacrylate crowns were 19.3% more retentive than the composite crowns (P =.015). There was no statistically significant difference among the 4 temporary cements when the manufacturer's mixing instructions were followed (P =.186). However, the thicker consistency Temrex was more retentive than the recommended Temrex mix and Temp-Bond.
机译：问题陈述：从业人员经常选择树脂材料和临时水泥，而对它们对临时牙冠保持力的影响了解甚少。目的：本研究评估了用2种材料制成并用4种临时胶结剂固结的临时修复体的保持力。方法和材料：准备新近提取的磨牙，其咬合面平坦，轴向长度为4毫米，会聚角为20度。标本被分成相等的组。用聚甲基丙烯酸甲酯（Temporary Bridge Resin）或双丙烯酸复合材料（Protemp Garant）为每种制剂构造临时胎冠，然后用Temp-Bond，Temp-Bond NE，Temrex和实验性氢氧化钙临时水泥进行粘结。第二组使用Temrex的患者使用推荐液体的一半进行评估。使用2.5kg的粘合力持续5分钟。初始工作台放置后，在室温水中放置24小时后，用Instron机械测试仪以0.5 mm / min的速度去除牙冠。使用2因子ANOVA，α= .05（n = 10）。用非参数卡方检验分析脱胶模式。结果：聚甲基丙烯酸甲酯冠的平均位移应力范围为670至1072 kPa，而复合材料制成的平均位移应力范围为554至884 kPa。临时材料的类型之间的差异几乎是显着的（P = .061），跨产品相互作用（P = .376）不显着，而水泥之间的差异显着（P = .002）和水泥的模式脱胶（P = .0034）。结论：排除Temp-Bond以消除交叉产物相互作用表明，聚甲基丙烯酸甲酯冠的保持力比复合冠高19.3％（P = .015）。当遵循制造商的混合说明时，这四种临时水泥之间没有统计学上的显着差异（P = .186）。但是，稠度更高的Temrex比推荐的Temrex混合物和Temp-Bond更具保持力。

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