Department of Dentistry, Federal University of Jequitinhonha and Mucuri Valleys, Rua da Glória, 187, Centro, Diamantinna, MG, 39100-000, Brazil.
Department of Mechanical Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil.
BMC Oral Health. 2020 Nov 3;20(1):300. doi: 10.1186/s12903-020-01295-0.
The aim was to analyze the fracture resistance of human teeth treated endodontically and restored with posts made of bovine dentin, human dentin, or glass fiber, and to evaluate the fracture pattern.
Cylindrical posts of 1.5 mm in diameter cemented to the roots of human maxillary canines presented a length of 15 mm, cervical diameter of 5-5.5 mm in the mesiodistal direction, and 7-7.5 mm in the vestibule-palatal direction. The groups studied were: Group I-10 glass fiber posts; Group II-10 human dentin posts; Group III-10 bovine dentin posts (self-adhesive resin cement); and Group IV-10 bovine dentin posts (resin-modified glass-ionomer cements). The coronal part of tooth was restored with a standardized core build-up using composite. All of the groups were submitted to a compression force test and the resistance to fracture was verified using a universal testing machine. The fracture pattern was likewise evaluated.
The values of resistance to fracture were: 723.3N in group I, 561.5N in group II, 556.6N in group III, and, 613.27N in group IV. However, no statistically significant difference was observed among the groups. The fractures in groups I and II were most commonly found in the middle/apical third and were considered irreparable. For restored teeth in group III, half of the fractures appeared in the cervical third and were reparable. In group IV, all of the fractures were reparable, with the majority in the cervical thirds.
Bovine dentin can be used as intraradicular post to substitute human dentin and glass fiber posts. The greater the malleability of the post, the greater the chances of survival of the teeth when subjected to fracture testing.
本研究旨在分析根管治疗后使用牛牙本质、人牙本质或玻璃纤维制成的桩核修复的人牙的抗折能力，并评估其折裂模式。
将直径为 1.5mm 的圆柱形桩核黏固于上颌恒尖牙的根管内，其长度为 15mm，近远中向的颈径为 5-5.5mm，颊舌向的颈径为 7-7.5mm。研究的 4 个组分别为：I 组（10 个玻璃纤维桩）、II 组（10 个人牙本质桩）、III 组（10 个牛牙本质桩[自黏树脂水门汀]）和 IV 组（10 个牛牙本质桩[树脂改良型玻璃离子水门汀]）。牙冠部分用复合树脂进行标准核构建修复。所有组均进行压缩力测试，使用万能试验机验证抗折能力。同样对折裂模式进行评估。
各组的抗折能力值分别为：I 组 723.3N、II 组 561.5N、III 组 556.6N 和 IV 组 613.27N。然而，各组之间无统计学差异。I 组和 II 组的折裂多发生于中段/根尖段，且被认为不可修复。III 组中，有一半的修复牙折裂发生于颈段，且可修复。IV 组中，所有折裂均可修复，且多数发生于颈段。
牛牙本质可作为根管内桩核替代人牙本质和玻璃纤维桩。桩核的延展性越大，在进行抗折测试时，牙齿的存活率越高。
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