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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of connector design on the fracture resistance of all-ceramic fixed partial dentures.
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Effect of connector design on the fracture resistance of all-ceramic fixed partial dentures.

机译：连接器设计对全瓷固定局部义齿的抗断裂性的影响。

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Statement of Problem. Fracture of all-ceramic fixed partial dentures (FPDs) tends to occur in the connector area. Purpose. The objective of this study was to test the hypothesis that the radii of curvature at the connector affects the fracture resistance of 3-unit FPDs. Material and Methods. With the use of a standardized silicone mold, 40 three-unit FPD wax patterns were fabricated with the same dimensions and divided into 4 groups of 10 specimens per group. Each pattern was modified at the connector areas of the occlusal embrasure (OE) and the gingival embrasure (GE); 2 wax carvers with radii of curvature at their tips of 0.90 mm and 0.25 mm were used. The dimensions of the connectors were standardized with an electronic caliper to 4 +/- 0.12 mm in height and 5 +/- 0.13 mm in width. Connector designs were as follows: Design I: OE and GE 0.90 mm; Design II: OE 0.90 mm and GE 0.25 mm; Design III: OE 0.25 mm and GE 0.90 mm; and Design IV (control): OE and GE 0.25 mm. An experimental hot-pressed core ceramic was used to make the FPD frameworks, which were consequently cemented on epoxy dies with dual-polymerizing composite (Variolink II) and loaded to fracture in a universal testing machine at a crosshead speed of 0.5 mm/min. The failure load data were analyzed with analysis of variance (ANOVA; P=.05) and Duncan's test (alpha=.01). Results. The mean failure loads and standard deviations were as follows: 943 +/- 151 N for Design I; 746 +/- 106 N for Design II; 944 +/- 144 N for Design III; and 673 +/- 55 N for Design IV. ANOVA revealed a significant difference (P
机译：问题陈述。全陶瓷固定局部义齿（FPD）的断裂往往发生在连接器区域。目的。这项研究的目的是检验以下假设：连接器的曲率半径会影响3单位FPD的抗断裂性。材料与方法。使用标准的有机硅模具，以相同的尺寸制作了40个三单元FPD蜡模，并分为4组，每组10个样品。在咬合环（OE）和牙龈环（GE）的连接器区域修改了每种模式;使用2个蜡刻刀，其尖端的曲率半径分别为0.90 mm和0.25 mm。用电子卡尺将连接器的尺寸标准化为高度4 +/- 0.12 mm和宽度5 +/- 0.13 mm。连接器设计如下：设计I：OE和GE 0.90 mm;设计II：OE 0.90毫米和GE 0.25毫米;设计III：OE 0.25毫米和GE 0.90毫米;设计IV（对照）：OE和GE 0.25毫米。使用实验性热压芯陶瓷制作FPD框架，然后将其与双聚合复合材料（Variolink II）粘合在环氧模具上，并以0.5 mm / min的十字头速度在通用测试机中加载以使其断裂。通过方差分析（ANOVA; P = .05）和邓肯检验（alpha = .01）来分析失效载荷数据。结果。平均失效载荷和标准偏差如下：设计I为943 +/- 151 N;设计II：746 +/- 106 N;设计III的944 +/- 144 N;设计673和673 +/- 55N。方差分析显示不同连接器设计的平均失效载荷之间存在显着差异（P

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