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Composite resin core with prefabrocated fiber posts for endodontically treated teeth

用于经过牙髓治疗的牙齿的带有预制纤维桩的复合树脂芯

基本信息

批准号：
14571869
负责人：
TSUBOTA Yuji
金额：
$ 0.9万
依托单位：
TSURUMI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571869/
关键词：
core buildups composite resin core buildups fiber post prefabricated post cyclic loading fracture test fracture strength facture mode ファイバー系既製ポスト繰返し荷重

项目摘要

Endodontically treated teeth due to dental caries and trauma are generally restored with post and cores and then crowned resulting in recovery of their function and esthetics.We examined proportional limit and bending elastic modulus of several kinds of fiber posts in 2002 and obtained the following findings that those posts have almost the same strength as the prefabricated metal post with high elasticity and flexibility.In 2003 we did an additional experiment from the clinical view point. Eighty bovine teeth simulating the human upper central incisors fabricated by Celay system (Mikrona, Switzerland) were prepared and divided into 4 groups by core-buildup method ; composite resin post and core (R), composite resin core with prefabricated metal post (MR), composite resin core with fiber post (FR) and conventional cast post and core (M). After building up cores, metal crowns were fabricated and cemented. Then fracture strength was measured before and after cyclic loading that loaded with 250N at every second until 300,000 times and also their fracture modes were observed and recorded.As a result, FR showed the highest fracture strength in all core buildup methods before cyclic loading and better fracture mode with no root fracture, while MR and M using metal posts indicated root fracture. After cyclic loading, fracture strength of FR decreased but statistically with no difference.In conclusion, composite resin core with fiber post can be higly resistant to root fracture and even if root fracture occurs, the root can be saved and restored in high possibility.

因龋齿和外伤所致的根管治疗牙，一般采用桩核冠修复，恢复其功能和美观。2002年，我们对几种纤维桩的比例极限和弯曲弹性模量进行了检测，结果表明，这些桩具有与预制金属桩相同的强度，具有高弹性和柔韧性。2003年，我们从临床角度进行了进一步的实验。采用积核法制备了80颗模拟人上中切牙的牛牙，采用堆积法分为4组：复合树脂桩核(R组)、预制金属桩核(MR组)、纤维桩核(FR组)和常规铸造桩核组(M组)。在建立核芯后，金属冠被制造并粘结。结果表明，在循环加载前、后，FR的断裂强度最高，且无根折，而MR和M则表现为根折。循环加载后，FR的断裂强度有所下降，但差异无统计学意义。综上所述，纤维桩复合树脂核抗根折能力较强，即使发生根折，也有较高的保存率。