Department of Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
Division of Pediatric Dentistry, Department of Preventive Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
J Prosthodont Res. 2023 Jul 31;67(3):376-383. doi: 10.2186/jpr.JPR_D_22_00049. Epub 2022 Aug 18.
Purpose To compare and evaluate the effects of different indirect composite onlay and/or core buildup materials on the fracture resistance and fracture mode of restored endodontically treated premolars.Methods Two conventional handmade indirect composite resins (SR Nexco (NC) and Ceramage (CM)) and two core buildup materials, dual-cure composite resin (MultiCore Flow (MC)), and short fiber-reinforced composite resin (EverX Posterior (EXP)), were selected. Sixty maxillary premolars were randomly divided into six groups (n=10). Group 1 included intact teeth (INT; positive control). Mesio-occluso-distal cavity preparation and endodontic treatment was performed on the remaining premolars. Group 2 was restored with polymer-reinforced zinc oxide eugenol intermediate restorative material (IRM; negative control), whereas the experimental groups (groups 3-6) were restored with core buildup material and indirect composite onlay (MC_NC, MC_CM, EXP_NC, and EXP_CM). The specimens received compressive loading using a universal testing machine, at 45° to the long axis with a crosshead speed of 0.5 mm/min until fracture. Fracture modes were visually analyzed. Fracture resistance was measured and statistically analyzed using two-way and one-way ANOVA (α=0.05).Results Only the type of indirect composite onlay affected the fracture resistance of the experimental groups (P=0.009). The MC_CM group showed the highest fracture resistance, which was significantly higher than that of the MC_NC group (P=0.031). No statistically significant differences were found between the INT group and other experimental groups(P>0.05). All groups had a greater incidence of restorable than unrestorable failures.Conclusions The type of indirect composite onlay affected the fracture resistance of restored endodontically treated maxillary premolars.
比较和评估不同间接复合树脂嵌体和/或核材料对根管治疗后上颌前磨牙抗折性能和折裂模式的影响。
选择两种传统手工间接复合树脂（SR Nexco（NC）和 Ceramage（CM））和两种核材料，双固化复合树脂（MultiCore Flow（MC））和短纤维增强复合树脂（EverX Posterior（EXP））。60 颗上颌前磨牙随机分为 6 组（n=10）。第 1 组为完整牙（INT；阳性对照）。对其余前磨牙进行近中-颊-远中牙体预备和根管治疗。第 2 组用聚合物增强型氧化锌丁香酚中间修复材料（IRM；阴性对照）修复，而实验组（第 3-6 组）则用核材料和间接复合树脂嵌体修复（MC_NC、MC_CM、EXP_NC 和 EXP_CM）。使用万能试验机以 45°角于长轴方向对试件进行压缩加载，十字头速度为 0.5mm/min，直至发生断裂。通过肉眼分析折裂模式。采用双因素和单因素方差分析（α=0.05）测量抗折力并进行统计学分析。
仅间接复合树脂嵌体的类型影响实验组的抗折力（P=0.009）。MC_CM 组的抗折力最高，显著高于 MC_NC 组（P=0.031）。INT 组与其他实验组之间无统计学差异（P>0.05）。所有组的可修复性失败发生率均高于不可修复性失败。
间接复合树脂嵌体的类型影响根管治疗后的上颌前磨牙的抗折力。
