Effect of resin cements on the bond strength of three types of glass fiber post systems to intraradicular dentin.

Sue A Lavareda Correa Uchôa, Flávia L Botelho Amaral
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Abstract

Rehabilitating teeth after root canal treatment often requires the use of glass fiber posts (GFPs) to retain the final restorations, so the choice of resin cement is critical for bond strength (BS) and treatment success.

Aim: The aim of this study was to evaluate the effect of different GFP systems on BS to intraradicular dentin using two dual-curing resin cement types.

Materials and method: Thirty bovine incisors with wide canals were filled endodontically with gutta-percha and epoxy resin sealer. Initially, the canal filling was removed, and 4 mm of the apical seal was left intact. The teeth were divided into three groups according to the GFPs used: AP (anatomical posts - prefabricated GFP (Reforpost #2, Angelus®) relined with composite resin (Filtek Z350, 3M ESPE); SPLENDOR (Splendor SAP, Angelus®), and milled CAD/CAM (FiberCAD, Angelus®). Posts were fixed with conventional (RelyX Ultimate, 3M ESPE) or self-adhesive resin cement (RC) (RelyX U200, 3M ESPE), following the manufacturer's instructions. After 48 h, the roots were sectioned into thirds and subjected to pushout BS testing using a universal testing machine. BS data were analyzed using Wilcoxon and Mann- Whitney U tests. Failure modes were assessed with Fisher's Exact test (α=0.05).

Results: In the apical and middle root sections, BS was similar in the AP and Splendor groups, both of which performed better than the milled CAD/CAM group (p≤0.05). In the cervical section, BS was significantly higher for the anatomical posts than for Splendor and milled CAD/CAM posts. Self-adhesive RC promoted statistically lower BS compared to conventional RC for the milled CAD/CAM post in the cervical and middle thirds (p≤0.05). Self-adhesive RC provided statistically higher bond strength than conventional RC for the anatomical post in the apical third (p≤0.05). No significant difference in failure modes was observed between resin cements and different root sections (p>0.05).

Conclusion: The BS of the GFP system was affected by resin cement type and root section, with composite resin-relined anatomically shaped posts generally performing better.

树脂胶合剂对三种玻璃纤维桩体系与根内牙本质结合强度的影响。
根管治疗后修复牙齿通常需要使用玻璃纤维桩(gfp)来保留最终修复体,因此树脂水泥的选择对粘结强度(BS)和治疗成功至关重要。目的:本研究的目的是评估两种双固化树脂水泥对根内牙本质BS的影响。材料与方法:用杜仲胶和环氧树脂密封剂对30只牛切牙进行根管充填。最初,移除根管填充物,保留4mm的根尖密封。根据使用的GFP将牙齿分为三组:AP(解剖桩-预制GFP (Reforpost #2, Angelus®),复合树脂(Filtek Z350, 3M ESPE);SPLENDOR (SPLENDOR SAP, Angelus®)和铣削CAD/CAM (FiberCAD, Angelus®)。根据制造商的说明,用常规(RelyX Ultimate, 3M ESPE)或自粘树脂水泥(RC) (RelyX U200, 3M ESPE)固定立柱。48 h后,将根切成三段,使用万能试验机进行推力BS测试。BS数据采用Wilcoxon和Mann- Whitney U检验进行分析。采用Fisher’s Exact检验评估失效模式(α=0.05)。结果:AP组和Splendor组根尖和中根切片BS相似,均优于铣CAD/CAM组(p≤0.05)。在颈椎切片中,解剖桩的BS明显高于Splendor和铣削CAD/CAM桩。与传统RC相比,自粘RC在颈椎和中三分之一的CAD/CAM铣削后的BS较低(p≤0.05)。自粘RC在根尖三分之一解剖桩的粘接强度高于常规RC (p≤0.05)。树脂胶结剂与不同根段的破坏模式差异无统计学意义(p < 0.05)。结论:GFP系统的BS受树脂水泥类型和根截面的影响,复合树脂衬解剖形桩一般表现较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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