Establishment of intentional replantation of vertically fractured roots reconstructed with dentin-bonded resin.

本系列研究旨在建立牙本质粘结树脂修复纵折牙根的意向性再植作为一种可靠和持久的保存纵折牙的方法。研究一旨在检验无髓牙不同类型桩核系统修复后的抗折强度没有差异的零假设。人类前磨牙修复：以下桩系统之一：纤维桩，预制金属桩，或铸造金属桩核。研究了断裂载荷和断裂模式。实验二研究根管冲洗对树脂粘固剂与根管冲洗液（EDTA组：17%EDTA，60 s，10 s）剪切粘结强度的影响。 ...更多信息 EDTA/NaOCl组：17%EDTA持续60秒，随后10 ml 5%NaOCl，NaOCl组：10 ml 5%NaOCl，对照组：未处理）。将预制的树脂块在冲洗后用双固化树脂粘固剂与湿粘或自酸蚀粘合剂粘结在根面牙本质上。结果表明，EDTA/NaOCl组牙本质小管开口较多，树脂标记物均匀渗入牙本质小管，其剪切强度明显高于EDTA组。与对照组自酸蚀体系的剪切粘结强度显著高于自酸蚀体系。EDTA组中的浓度小于NaOCl组和对照组。根管冲洗对树脂水门汀与根端牙本质粘结的影响取决于所用的牙本质粘结系统，本研究结果表明，金属桩核系统在适当的粘结剂处理下，能有效地加强根管治疗后的牙体。少

The present series of studies were undertaken to establish the intentional replantation of vertically fractured roots reconstructed with dentin-bonded resin as a reliable and durable method to preserve vertically fractured tooth.The first study Was designed to test the null hypothesis that there is no difference in the fracture resistance of pulpless teeth restored with different types of post-core systems. Human premolars were restored with: one of the following post systems: a fiber post, a prefabricated metallic post, or cast metallic post-core. The fracture load and mode of fracture were investigated. Among the groups with different post-cores systems, the fracture load of the teeth restored with cast metallic post-cores was greatest, whereas that with prefabricated metallic posts was smallest.The second study was planed to investigate the influence of endodontic irrigation on shear bond strengths of resin cement to radicular dentin irrigations (EDTA group: 17% EDTA for 60 seconds, … More EDTA/NaOCl group: 17% EDTA for 60 seconds followed by 10 ml of 5% NaOCl, NaOCl group: 10 ml of 5% NaOCl, and Control group: no treatment). A prefabricated resin block was bonded to the radicular dentin after irrigation using a dual-cured resin cement with' either wet-bonding or self-etching adhesives. Shear bond strengths Were then measured.With the wet-bonding system, the shear bond strengths for the EDTA/NaOCl group, in which excessive dentinal tubules openings and uniform resin tag penetration into dentinal tubules were observed, were significantly greater than the EDTA. and control groups. With the self-etching system, the shear bond strengths were significantly. smaller in the EDTA group compared to the NaOCl and control groups. The effects of endodontic irrigatioh onthe bonding of resin cement to radicular dentin depended on the dentin bonding system used.The results of the present studies indicated that metallic post-core system effectively strengthened the endodontically treated teeth with appropriate adhesive tre~itment. Less