Ali Mohamed Raouf W, Mustafa Manal, Bårdsen Asgeir, Bletsa Athanasia
Department of Clinical Dentistry Faculty of Medicine, University of Bergen, Bergen, Norway.
Oral Health Centre of Expertise in Western Norway, Bergen, Norway.
Acta Biomater Odontol Scand. 2019 Jan 31;5(1):30-37. doi: 10.1080/23337931.2019.1570822. eCollection 2019.
This study aims to evaluate fracture resistance of simulated immature teeth after treatment with regenerative endodontic procedure (REP) using tricalcium silicate cements (TSCs) as cervical plugs. Bovine incisors were sectioned to standard crown/root ratio. Pulp tissue was removed and canals were enlarged to a standardized diameter. Teeth were then treated with a REP protocol consisting of NaOCl and EDTA irrigation, intracanal medication with triple-antibiotic paste for 14 days followed by a TSC cervical seal and composite restoration. Teeth were divided into groups according to the material used; Mineral-Trioxide-Aggregate (MTA), Biodentine, TotalFill. Teeth filled with guttapercha (GP) and intact teeth served as controls. All teeth subjected to an increasing compressive force (rate of 0.05 mm/s at a 45° angle to the long axis of the tooth) until fracture. All treated teeth exhibited significantly lower resistance to fracture compared to the intact teeth but no difference was found between the TSC groups (Kruskal-Wallis, Dunn's multiple comparison, < .05). TSCs applied at the cervical area of simulated immature teeth treated with REP did not reinforce fracture resistance.
本研究旨在评估使用硅酸三钙水门汀（TSCs）作为颈部封闭剂，经牙髓再生治疗程序（REP）处理后的模拟未成熟牙齿的抗折性。将牛切牙切割至标准冠根比。去除牙髓组织，将根管扩大至标准化直径。然后对牙齿进行REP治疗方案，包括次氯酸钠和乙二胺四乙酸冲洗、用三联抗生素糊剂进行根管内用药14天，随后进行TSC颈部封闭和复合树脂修复。根据所用材料将牙齿分为几组；矿物三氧化物聚合体（MTA）、生物陶瓷、TotalFill。用牙胶尖（GP）充填的牙齿和完整牙齿作为对照。所有牙齿均承受逐渐增加的压缩力（以与牙齿长轴成45°角的0.05mm/s的速率）直至折断。与完整牙齿相比，所有治疗后的牙齿抗折性均显著降低，但TSC组之间未发现差异（Kruskal-Wallis检验，Dunn多重比较，P＜0.05）。在经REP治疗的模拟未成熟牙齿颈部区域应用TSCs并不能增强抗折性。
