Abutment Screw Loosening in Single Implant Restorations: Evaluation of Fracture Strength of Implant-Supported Cement-Retained Monolithic Zirconia Restorations Repaired with Porcelain and Composite Resin

IF 0.6 Q4 DENTISTRY, ORAL SURGERY & MEDICINE Dental Hypotheses Pub Date : 2021-07-01 DOI:10.4103/denthyp.denthyp_125_21

H. Asli, M. Falahchai, S. Rahimabadi, H. Arbab, Zoheir Mousavi Mehr

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Abstract

Aim: To assess the fracture strength of repaired implant-supported cement-retained monolithic zirconia restorations with porcelain and composite resin. Materials and methods: Nighty monolithic zirconia crowns were cemented over the implant abutments, and divided into three groups (n = 30): control, screw access hole preparation in the crown and its restoration with composite resin (HC), and screw access hole preparation in the crown and its restoration with feldspathic porcelain (HP). Fracture strength was measured by a universal testing machine. Data were analyzed (α < 0.05). Results: The maximum fracture strength was in the control group (764.23 ± 108.41 N), whereas the minimum was in HC group (686.25 ± 101.86 N). The mean fracture strength in HC group was significantly lower than that in the control group (P = 0.008). No significant difference was noted between other groups (P > 0.05). Conclusion: Repaired implant-supported monolithic zirconia crowns with feldspathic porcelain provided a fracture strength comparable to that in the control group.

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单个种植体修复中的桥台螺钉松动：用陶瓷和复合树脂修复种植体支撑的水泥保留整体氧化锆修复体的断裂强度评估

目的:评价瓷复合树脂修复种植体骨水泥保留整体氧化锆修复体的断裂强度。材料与方法:在种植体基牙上粘接一整块氧化锆冠，分为对照组、冠内预备螺钉接入孔及复合树脂修复组(HC)、冠内预备螺钉接入孔及长石瓷修复组(HP)三组(n = 30)。断裂强度由万能试验机测定。对数据进行分析(α < 0.05)。结果:对照组骨折强度最大(764.23±108.41 N)， HC组骨折强度最小(686.25±101.86 N)。HC组平均断裂强度显著低于对照组(P = 0.008)。其他组间差异无统计学意义(P < 0.05)。结论:长石瓷修复的种植支撑整体氧化锆冠的断裂强度与对照组相当。

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