{"title":"Fracture Resistance of Maxillary Premolars With Class II MOD Cavities Restored With Direct and Indirect Resin Composite Restorative Systems.","authors":"Rasha M Salama, Hamdi H Hamama, Salah H Mahmoud","doi":"10.1111/jerd.13459","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>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.</p><p><strong>Methods: </strong>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.</p><p><strong>Results: </strong>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.</p><p><strong>Conclusions: </strong>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.</p><p><strong>Clinical significance: </strong>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.</p>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":" ","pages":""},"PeriodicalIF":3.2000,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Esthetic and Restorative Dentistry","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1111/jerd.13459","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0
Abstract
Objective: 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.
Methods: 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.
Results: 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.
Conclusions: 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.
Clinical significance: 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.
目的评估用实验室复合材料和微杂化树脂复合材料（带或不带短纤维增强复合材料（SFRC）基底）修复的中-咬合-远端（MOD）Ⅱ类龋洞的上颌前磨牙的抗折性：将 50 颗健全的上颌前磨牙随机分为 5 组（n = 10）：G1：完整牙齿（阴性对照组）；G2：未修复 MOD 龋齿（阳性对照组）；G3：完整牙齿（阳性对照组）；G4：完整牙齿（阴性对照组）；G5：完整牙齿（阳性对照组）：G1：完整牙齿（阴性对照）；G2：未修复的 MOD 牙洞（阳性对照）；G3：用实验室间接复合材料修复的 MOD 嵌体牙洞；G4：用 SFRC 基底和微混合基底修复的 MOD 牙洞；G5：用微混合基底修复的 MOD 牙洞。所有试样均经过 5000 次热循环，然后承受轴向静压载荷，直至发生断裂。对破坏模式进行检查：结果：阴性对照组显示出最大的抗折断性，而阳性对照组显示出最低的抗折断性（p 结论：阴性对照组和阳性对照组的抗折断性差异很大：牙齿的抗折性受修复材料的影响很大。在压缩负荷下，使用含有短纤维增强复合材料基底的微混合修复体修复的牙齿表现出与实验室复合材料修复体相当的抗折性：临床意义：考虑到短纤维增强复合材料的实验结果与实验室间接复合材料的实验结果相当，而且还具有治疗时间短和成本效益高的优点，因此直接修复法成为修复二类 MOD 龋齿的理想选择。
期刊介绍：
The Journal of Esthetic and Restorative Dentistry (JERD) is the longest standing peer-reviewed journal devoted solely to advancing the knowledge and practice of esthetic dentistry. Its goal is to provide the very latest evidence-based information in the realm of contemporary interdisciplinary esthetic dentistry through high quality clinical papers, sound research reports and educational features.
The range of topics covered in the journal includes:
- Interdisciplinary esthetic concepts
- Implants
- Conservative adhesive restorations
- Tooth Whitening
- Prosthodontic materials and techniques
- Dental materials
- Orthodontic, periodontal and endodontic esthetics
- Esthetics related research
- Innovations in esthetics
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