Salama Rasha M, Hamama Hamdi H, Mahmoud Salah H
Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Conservative Dentistry Department, Faculty of Dentistry, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt.
J Esthet Restor Dent. 2025 Jul;37(7):1791-1801. doi: 10.1111/jerd.13459. Epub 2025 Mar 16.
To assess the fracture resistance of maxillary premolars with mesio-occluso-distal (MOD) Class II cavities restored with lab composite and microhybrid resin composite, with or without a short fiber-reinforced composite (SFRC) base.
Fifty sound maxillary premolars were divided randomly into 5 groups (n = 10); G1: Intact teeth (negative control), G2: Unrestored MOD cavities (positive control), G3: MOD inlay cavities restored with indirect lab composite, G4: MOD cavities restored with an SFRC base and microhybrid composite, and G5: MOD cavities restored with microhybrid composite. All specimens were thermocycled for 5000 cycles, then subjected to an axial static compressive load until fracture occurred. Failure modes were inspected.
Negative control group exhibited maximum fracture resistance, whereas positive control revealed the lowest (p < 0.05). Microhybrid composite restorations with an SFRC base demonstrated fracture thresholds not significantly different from indirect lab composite (p = 0.22); however, those without an SFRC base presented the least resistance to fracture among restored groups (p < 0.05). Cohesive failure of restorative material was mainly noted in the microhybrid composite group without an SFRC base, whereas adhesive failures were observed in all groups.
The resistance of teeth to fracture is significantly influenced by the restorative material. Under compressive loads, the teeth restored with microhybrid composite restorations incorporating a short fiber-reinforced composite base exhibited comparable fracture resistance to laboratory composite restorations.
Considering that short fiber-reinforced composites revealed experimental outcomes comparable to those of indirect lab composites, along with the added benefits of shorter treatment time and cost-effectiveness, the direct approach becomes an ideal option for restoring teeth with Class II MOD cavities.
评估采用唇侧复合树脂和微混合树脂复合材料修复近中-咬合-远中（MOD）Ⅱ类洞型的上颌前磨牙的抗折性能，修复时使用或不使用短纤维增强复合材料（SFRC）基底。
将50颗健康的上颌前磨牙随机分为5组（n = 10）；G1：完整牙齿（阴性对照），G2：未修复的MOD洞型（阳性对照），G3：用间接唇侧复合树脂修复的MOD嵌体洞型，G4：用SFRC基底和微混合复合材料修复的MOD洞型，G5：用微混合复合材料修复的MOD洞型。所有标本进行5000次热循环，然后施加轴向静态压缩载荷直至发生骨折。检查失败模式。
阴性对照组表现出最大的抗折性能，而阳性对照组显示最低（p < 0.05）。带有SFRC基底的微混合复合材料修复体的骨折阈值与间接唇侧复合树脂无显著差异（p = 0.22）；然而，没有SFRC基底的修复体在修复组中抗折性最差（p < 0.05）。在没有SFRC基底的微混合复合材料组中，主要观察到修复材料的内聚性失败，而在所有组中均观察到粘结性失败。
牙齿的抗折性受修复材料的显著影响。在压缩载荷下，用含有短纤维增强复合材料基底的微混合复合材料修复的牙齿表现出与实验室复合树脂修复体相当的抗折性。
鉴于短纤维增强复合材料显示出与间接唇侧复合树脂相当的实验结果，以及治疗时间短和成本效益高的额外好处，直接修复方法成为修复MODⅡ类洞型牙齿的理想选择。
