Fráter Márk, Sáry Tekla, Vincze-Bandi Eszter, Volom András, Braunitzer Gábor, Szabó P Balázs, Garoushi Sufyan, Forster András
Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, H-6720 Szeged, Hungary.
Volom Dental, H-1037 Budapest, Hungary.
Polymers (Basel). 2021 Jun 23;13(13):2040. doi: 10.3390/polym13132040.
The aim of this research was to study the impact of using a short fiber-reinforced composite (SFRC) core on the fatigue performance and fracture behavior of direct large posterior composite restorations. Moreover, the influence of the consistency (flowable or packable) of occlusal composite coverage was assessed. A total of 100 intact molars were collected and randomly distributed into five groups (n = 20). Deep mesio-occlusal-distal (MOD) cavities were prepared in all groups. After adhesive treatment and rebuilding the missing interproximal walls with conventional composite, the specimens in four experimental groups were restored by an SFRC core (everX Flow), which was applied and cured either in bulk or in oblique layers (each 2 mm thick). Packable (G-aenial Posterior) or flowable (G-aenial Injectable) conventional composites were used as a final occlusal layer. The control group was restored with only packable conventional composite. Fatigue survival was measured for all specimens using a cyclic loading machine until a fracture occurred or a total of 25,000 cycles was achieved. Kaplan-Meyer survival analyses were conducted, followed by pairwise log-rank post hoc comparisons. The static load-bearing capacity of surviving teeth was tested using a universal testing machine. Fracture patterns were evaluated visually. There was no statistically significant ( > 0.05) difference in terms of survival between the tested groups. All groups for which flowable SFRC was used showed statistically significantly higher load-bearing capacities compared to the control group ( < 0.05). There were no significant differences regarding fracture resistance among the fiber-reinforced study groups. Regarding the fracture pattern during the survival analysis, all specimens that received SFRC showed a dominantly restorable type of fracture, while the control specimens presented a dominantly non-restorable type. The use of flowable SFRC as a reinforcing core for large MOD direct restorations showed promising achievements regarding fracture behavior.
本研究的目的是探讨使用短纤维增强复合材料（SFRC）桩核对直接后牙大面积复合树脂修复体疲劳性能和断裂行为的影响。此外，还评估了咬合面复合树脂覆盖层的稠度（可流动型或可压实型）的影响。共收集100颗完整磨牙，随机分为五组（n = 20）。所有组均制备深近中-咬合-远中（MOD）窝洞。经过粘结处理并用传统复合树脂重建缺失的邻面壁后，四个试验组的标本用SFRC桩核（everX Flow）修复，该桩核采用整体或斜层（每层2 mm厚）涂抹并固化。可压实型（G-aenial Posterior）或可流动型（G-aenial Injectable）传统复合树脂用作最终咬合面修复层。对照组仅用可压实型传统复合树脂修复。使用循环加载机对所有标本进行疲劳寿命测量，直至发生断裂或达到总共25000次循环。进行Kaplan-Meyer生存分析，随后进行两两对数秩事后比较。使用万能试验机测试存活牙齿的静态承载能力。通过肉眼评估断裂模式。各测试组之间在生存率方面无统计学显著差异（> 0.05）。与对照组相比，所有使用可流动型SFRC的组均显示出统计学显著更高的承载能力（< 0.05）。纤维增强研究组之间在抗断裂性方面无显著差异。关于生存分析期间的断裂模式，所有接受SFRC的标本均显示出主要为可修复型的断裂，而对照标本则呈现出主要为不可修复型的断裂。将可流动型SFRC用作大面积MOD直接修复体的增强桩核在断裂行为方面显示出有前景的成果。
