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论文摘要

不同材料修复喇叭型根管口的实验观察

An experimental study on repairing horn-shaped root canal orifice by different materials

作者:冯云枝 王压冲

Author:FENG Yun-zhi1, WANG Ya-chong2

收稿日期:2009-08-25          年卷(期)页码:2009,27(04):405-

期刊名称:华西口腔医学杂志

Journal Name:West China Journal of Stomatology

关键字:喇叭型根管口,纤维增强复合树脂,桩核,抗折性能,

Key words:horn-shaped root canal orifice,fiber-reinforced composite resin,post and core,fracture resistance,

基金项目:

国家博士后科学基金资助项目(2005037699);湖南省科委基金资助项目(06JJ4125)

中文摘要

目的观察不同材料修复喇叭型根管口后的抗折裂强度和破坏模式。方法将15颗离体上颌中切牙截除牙冠后进行常规根管治疗,形成喇叭型根管口,然后随机分为A、B、C组,分别用镍铬合金铸造桩核、预成玻璃纤维树脂桩核和可塑性纤维增强树脂桩核修复。在压力测试机上对试件进行抗折裂强度测试,并记录破坏模式。结果3组试件修复后的抗折裂强度无统计学差异(P>0.05),但破坏模式不同,其中A组铸造桩核试件主要表现为根折和粘接剂与牙体分离,B组预成玻璃纤维树脂桩核试件主要表现为桩与粘接剂分离,C组可塑性纤维增强树脂桩核试件主要表现为粘接剂与牙体组织分离。结论纤维树脂类修复材料修复喇叭型根管口有利于残根的保存和再次修复。

英文摘要

Objective To study the fracture resistance and the failure pattern of horn-shaped root canal orifice restored by different materials. Methods Fifteen human maxillary central incisors were selected. After schedule root canal therapy, the residual dental roots with horn-shape root canal orifice were prepared. The specimens were assigned to three groups randomly. A group was rehabilitated by casting metal post -core crown. B group was rehabilitated by prefabricated fiber post and composite core crown. C group was rehabilitated by shapeable fiberreinforced composite resin post and core crown. Loads were applied on the samples at 130 degree to the long axis of the root and measured with universal testing machine. The failing patterns were recorded. Results There were no difference in fracture resistance among three groups(P>0.05). But the failing patterns were different. A group manifested root fracture and separation between cement and root dentin. B group mainly manifested separation between cement and post. C group manifested separation between cement and root dentin. Conclusion For restoration of residual dental root with horn-shaped orifice, fiber composite post-core crown has advantages in residual root protection and once more restoration.

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