Department of Prosthetic Dentistry, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey.
Department of Biomaterials Science, Institute of Dentistry, Faculty of Medicine, University of Turku, Turku, Finland.
Med Sci Monit. 2018 Jun 28;24:4440-4448. doi: 10.12659/MSM.909271.
BACKGROUND The aim of this study was to investigate and compare the load-bearing capacities of three-unit direct resin-bonded fiber-reinforced composite fixed dental prosthesis with different framework designs. MATERIAL AND METHODS Sixty mandibular premolar and molar teeth without caries were collected and direct glass fiber-resin fixed FDPs were divided into 6 groups (n=10). Each group was restored via direct technique with different designs. In Group 1, the inlay-retained bridges formed 2 unidirectional FRC frameworks and pontic-reinforced transversal FRC. In Group 2, the inlay-retained bridges were supported by unidirectional lingual and occlusal FRC frameworks. Group 3, had buccal and lingual unidirectional FRC frameworks without the inlay cavities. Group 4 had reinforced inlay cavities and buccal-lingual FRC with unidirectional FRC frameworks. Group 5, had a circular form of fiber reinforcement around cusps in addition to buccal-lingual FRC frameworks. Group 6 had a circular form of fiber reinforcement around cusps with 2 bidirectional FRC frameworks into inlay cavities. All groups were loaded until final fracture using a universal testing machine at a crosshead speed of 1 mm/min. RESULTS Mean values of the groups were determined with ANOVA and Tukey HSD. When all data were evaluated, Group 6 had the highest load-bearing capacities and revealed significant differences from Group 3 and Group 4. Group 6 had the highest strain (p>0.05). When the fracture patterns were investigated, Group 6 had the durability to sustain fracture propagation within the restoration. CONCLUSIONS The efficiency of fiber reinforcement of the restorations alters not only the amount of fiber, but also the design of the restoration with fibers.
本研究旨在调查和比较三种三单位直接树脂粘结纤维增强复合固定义齿修复体在不同框架设计下的承载能力。
收集 60 颗下颌前磨牙和磨牙，无龋坏，直接玻璃纤维树脂固定 FDP 分为 6 组（n=10）。每组均采用不同设计的直接技术修复。在第 1 组中，嵌体保留桥形成 2 个单向 FRC 框架和桥体增强横向 FRC。在第 2 组中，嵌体保留桥由单向舌侧和颊侧 FRC 框架支撑。第 3 组无嵌体腔的颊舌侧单向 FRC 框架。第 4 组有增强嵌体腔和颊舌侧 FRC 与单向 FRC 框架。第 5 组除颊舌侧 FRC 框架外，在牙尖周围还有环形纤维增强。第 6 组在嵌体腔中有 2 个双向 FRC 框架，牙尖周围有环形纤维增强。所有组均在万能试验机上以 1mm/min 的十字头速度加载至最终断裂。
用方差分析和 Tukey HSD 确定组的平均值。当所有数据评估时，第 6 组的承载能力最高，与第 3 组和第 4 组有显著差异。第 6 组的应变最大（p>0.05）。当研究断裂模式时，第 6 组具有使断裂在修复体内持续传播的耐久性。
纤维增强修复体的效率不仅改变纤维的数量，而且改变纤维修复体的设计。
