玻璃纤维桩长度和纤维含量对牙体抗折强度的影响

发布时间：2019-05-22 21:03

【摘要】：目的研究玻璃纤维桩长度和纤维含量对牙齿抗折强度的影响,探索进行牙体缺损修复所适宜的玻璃纤维桩长度和纤维含量。方法选择42颗因正畸拔除完整的下颌前磨牙,随机分为A、B、C3个实验组,每组14颗牙。自釉牙骨质界上2 mm截冠后行完善的根管治疗,进行桩道预备,桩道深度分别为A组10 mm、B组8 mm、C组6mm。每个实验组再各分成2个亚组,每组7颗牙。A1、B1、C1组应用纤维含量42%玻璃纤维桩,A2、B2、C2组应用纤维含量75%玻璃纤维桩,进行桩粘接、树脂核塑型及金属冠修复。将所有实验标本制成试件,置于万能材料实验机上进行抗折裂强度测试,记录牙根折断时的瞬间压力值以及试件折断的模式。结果玻璃纤维桩修复后的牙体抗折强度A组高于B组及C组,B组高于C组(均P0.05);纤维含量75%玻璃纤维桩高于纤维含量42%玻璃纤维桩(P0.05)。结论用玻璃纤维桩修复缺损牙体时,在一定范围内,桩的长度越长,牙体抗折强度越大。纤维含量75%玻璃纤维桩修复后牙体抗折强度大于纤维含量42%玻璃纤维桩。
[Abstract]:Objective to study the effect of glass fiber post length and fiber content on the bending strength of teeth, and to explore the suitable length and fiber content of glass fiber post for tooth defect repair. Methods 42 complete mandibular premolars were randomly divided into A, B, C3 experimental groups with 14 teeth in each group. Perfect root canal therapy was performed after 2 mm crown cutting at the upper boundary of glazed teeth, and post preparation was carried out. The depth of post was 6 mm in group A, 10 mm,B, 8 mm,C, and 6 mm, respectively. Each experimental group was divided into two subgroups with 7 teeth in each group. A1, B1, C1 group were treated with 42% glass fiber post, A2, B2, C2 group were treated with 75% glass fiber post for post bonding. Resin nuclear molding and metal crown repair. All the experimental specimens were made into specimens, and the fracture strength was tested on a universal material experimental machine. the instantaneous pressure value of root fracture and the fracture mode of the specimen were recorded. Results the bending strength of teeth in group A was higher than that in group B and group C, and that in group B was higher than that in group C (P 0.05), and the fiber content of 75% glass fiber post was higher than that of 42% glass fiber post (P 0.05). Conclusion the longer the length of the post is, the greater the bending strength of the tooth is when the defective tooth is repaired with glass fiber post. The bending strength of teeth repaired with 75% fiberglass fiber post was higher than that of 42% fiberglass post with fiber content.
【作者单位】：天津医科大学一中心临床学院口腔科;
【分类号】：R783

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