【摘要】：目的研究玻璃纖維樁長度和纖維含量對牙齒抗折強度的影響,探索進行牙體缺損修復所適宜的玻璃纖維樁長度和纖維含量。方法選擇42顆因正畸拔除完整的下頜前磨牙,隨機分為A、B、C3個實驗組,每組14顆牙。自釉牙骨質(zhì)界上2 mm截冠后行完善的根管治療,進行樁道預備,樁道深度分別為A組10 mm、B組8 mm、C組6mm。每個實驗組再各分成2個亞組,每組7顆牙。A1、B1、C1組應用纖維含量42%玻璃纖維樁,A2、B2、C2組應用纖維含量75%玻璃纖維樁,進行樁粘接、樹脂核塑型及金屬冠修復。將所有實驗標本制成試件,置于萬能材料實驗機上進行抗折裂強度測試,記錄牙根折斷時的瞬間壓力值以及試件折斷的模式。結(jié)果玻璃纖維樁修復后的牙體抗折強度A組高于B組及C組,B組高于C組(均P0.05);纖維含量75%玻璃纖維樁高于纖維含量42%玻璃纖維樁(P0.05)。結(jié)論用玻璃纖維樁修復缺損牙體時,在一定范圍內(nèi),樁的長度越長,牙體抗折強度越大。纖維含量75%玻璃纖維樁修復后牙體抗折強度大于纖維含量42%玻璃纖維樁。
[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.
【作者單位】： 天津醫(yī)科大學一中心臨床學院口腔科;
【分類號】：R783

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