Effect of connector configuration on the fracture load in conventional and translucent zirconia three-unit fixed dental prostheses
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PURPOSE. The purpose of this study was to determine the effect of the connectorconfiguration on the fracture load in conventional and translucent zirconiaof three-unit fixed dental prostheses (FDPs). MATERIALS AND METHODS. Sixdifferent three-unit FDPs were prepared (n = 6) from three types of zirconia(3Y-TZP (Katana ML®), 4Y-TZP (Katana STML®), and 5Y-TZP (Katana UTML®)) incombination with two connector configurations (4 × 2.25, 3 × 3 mm). The Co-Cr master models were scanned, and the FDPs were designed and fabricatedusing CAD-CAM. The FDPs were cemented on the metal model and then loadedwith a UTM at a crosshead speed of 1 mm/min until failure. Two-way ANOVA andTukey’s test were used for statistical analysis (α = .05). RESULTS. Fracture loads of 3Y-TZP (2740.6 ± 469.2 and 2718.7 ± 339.0 N for size 4 × 2.25 mm and 3 × 3 mm,respectively) were significantly higher than those of 4Y-TZP (1868.3 ± 281.6 and1663.6 ± 372.7 N, respectively) and 5Y-TZP (1588.0 ± 255.0 and 1559.1 ± 110.0N, respectively) (P < .05). No significant difference was found between fractureloads of 4Y-TZP and 5Y-TZP (P > .05). The connector configuration within 9 mm2was found to have no effect on the fracture loads on all three types of zirconia (P > .05). CONCLUSION. Fracture loads of three-unit FDPs were affected by the typeof zirconia. The fracture loads of conventional zirconia were higher than those oftranslucent zirconia. However, it was not affected by the connector configurationwhen the connector had a cross-sectional area of 9 mm2.
Abstract
PURPOSE. The purpose of this study was to determine the effect of the connectorconfiguration on the fracture load in conventional and translucent zirconiaof three-unit fixed dental prostheses (FDPs). MATERIALS AND METHODS. Sixdifferent three-unit FDPs were prepared (n = 6) from three types of zirconia(3Y-TZP (Katana ML®), 4Y-TZP (Katana STML®), and 5Y-TZP (Katana UTML®)) incombination with two connector configurations (4 × 2.25, 3 × 3 mm). The Co-Cr master models were scanned, and the FDPs were designed and fabricatedusing CAD-CAM. The FDPs were cemented on the metal model and then loadedwith a UTM at a crosshead speed of 1 mm/min until failure. Two-way ANOVA andTukey’s test were used for statistical analysis (α = .05). RESULTS. Fracture loads of 3Y-TZP (2740.6 ± 469.2 and 2718.7 ± 339.0 N for size 4 × 2.25 mm and 3 × 3 mm,respectively) were significantly higher than those of 4Y-TZP (1868.3 ± 281.6 and1663.6 ± 372.7 N, respectively) and 5Y-TZP (1588.0 ± 255.0 and 1559.1 ± 110.0N, respectively) (P < .05). No significant difference was found between fractureloads of 4Y-TZP and 5Y-TZP (P > .05). The connector configuration within 9 mm2was found to have no effect on the fracture loads on all three types of zirconia (P > .05). CONCLUSION. Fracture loads of three-unit FDPs were affected by the typeof zirconia. The fracture loads of conventional zirconia were higher than those oftranslucent zirconia. However, it was not affected by the connector configurationwhen the connector had a cross-sectional area of 9 mm2.
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