Department of Prosthodontics, Crown, Bridge and Implantology, Patna Dental College and Hospital, Patna, Bihar, India.
Department of Orthodontics and Dentofacial Orthopaedics, Buddha Institute of Dental Sciences and Hospital, Patna, Bihar, India, Mobile: +91 8298919420, e-mail:
J Contemp Dent Pract. 2021 Jul 1;22(7):799-804.
To compare the fracture resistance in teeth managed by root canal treatment after restoring with different types of onlays, inlays, and endocrowns prepared with hybrid ceramics and pulp chambers restored with fiber-reinforced composite and resin composite that were radiopaque, light-cured, and flowable.
The present study was carried out on 252 extracted mandibular molars. All the specimens were divided into six groups randomly. Each group consisted of 42 specimens. Group 1 consisted of intact teeth without any access cavity. It was the control group. Group 2 consisted of teeth with endocrown and empty pulp chamber. Group 3 consisted of teeth with mesio-occlusal-distal (MOD) onlay prepared with hybrid ceramics and pulp chamber filled with flowable, light-cured, radiopaque resin composite. Group 4 consisted of teeth with MOD onlay and pulp chamber filled with fiber-reinforced composite. Group 5 consisted of teeth with MOD inlay and pulp chamber filled with flowable, light-cured, radiopaque resin composite. Group 6 consisted of teeth with MOD inlay and pulp chamber filled with fiber-reinforced composite. Inlay, onlay, and endocrowns were prepared with computer-aided design (CAD) and computer-aided machine (CAM) using hybrid ceramics. Universal testing machine was used for the measurement of the fracture resistance of each specimen. Inferential statistics were performed by applying Fisher's exact test and chi-square test.
Fracture strength was found to be maximum in the intact teeth group followed by the endocrown. The fracture strength was minimum in the inlay group. The fracture strength was intermediate in the onlay groups.
Endocrown showed maximum fracture resistance as compared to the inlay and onlay restorations.
Proper management of root canal-treated teeth is one of the greatest challenges for endodontists. It has been observed that tooth preparation design and the material used for the restoration of root canal-treated teeth play a vital role in the resistance against fracture in the teeth.
比较根管治疗后用不同类型嵌体、高嵌体和全冠修复，以及用混合陶瓷制备的髓室，并用光固化可流动复合树脂和纤维增强复合树脂修复的髓室的牙齿抗折能力。
本研究共纳入 252 颗下颌磨牙。所有标本随机分为六组。每组包含 42 个标本。第 1 组为无任何开髓腔的完整牙，为对照组。第 2 组为根管内冠和空牙髓腔的牙齿。第 3 组为用混合陶瓷制备的近中-颊舌-远中嵌体和用可流动、光固化、射线可透的树脂复合材料填充的牙髓腔的牙齿。第 4 组为用纤维增强复合材料填充牙髓腔的近中-颊舌-远中嵌体。第 5 组为用可流动、光固化、射线可透的树脂复合材料填充牙髓腔的 MOD 嵌体的牙齿。第 6 组为用纤维增强复合材料填充牙髓腔的 MOD 嵌体的牙齿。嵌体、高嵌体和全冠是用计算机辅助设计（CAD）和计算机辅助制造（CAM）用混合陶瓷制备的。使用万能试验机测量每个标本的抗折能力。应用 Fisher 精确检验和卡方检验进行推断性统计分析。
发现完整牙组的断裂强度最大，其次是根管内冠。嵌体组的断裂强度最小。嵌体组的断裂强度居中。
与嵌体和高嵌体修复体相比，根管内冠显示出最大的抗折能力。
根管治疗后的牙齿的适当管理是牙髓病医生面临的最大挑战之一。已经观察到，牙齿预备设计和用于修复根管治疗后的牙齿的材料对于牙齿的抗折能力起着至关重要的作用。
