【摘要】：目的研究玻璃纖維樁長度和纖維含量對(duì)牙齒抗折強(qiáng)度的影響,探索進(jìn)行牙體缺損修復(fù)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(jī)分為A、B、C3個(gè)實(shí)驗(yàn)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(jìn)行樁道預(yù)備,樁道深度分別為A組10 mm、B組8 mm、C組6mm。每個(gè)實(shí)驗(yàn)組再各分成2個(gè)亞組,每組7顆牙。A1、B1、C1組應(yīng)用纖維含量42%玻璃纖維樁,A2、B2、C2組應(yīng)用纖維含量75%玻璃纖維樁,進(jìn)行樁粘接、樹脂核塑型及金屬冠修復(fù)。將所有實(shí)驗(yàn)標(biāo)本制成試件,置于萬能材料實(shí)驗(yàn)機(jī)上進(jìn)行抗折裂強(qiáng)度測試,記錄牙根折斷時(shí)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(fù)后的牙體抗折強(qiáng)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(fù)缺損牙體時(shí),在一定范圍內(nèi),樁的長度越長,牙體抗折強(qiáng)度越大。纖維含量75%玻璃纖維樁修復(fù)后牙體抗折強(qiáng)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(xué)一中心臨床學(xué)院口腔科;
【分類號(hào)】：R783

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