本文選題：雙尖牙 + 樁核技術(shù)��； 參考：《北京大學(xué)學(xué)報(bào)(醫(yī)學(xué)版)》2014年01期

【摘要】：目的:研究牙槽骨高度降低對不同樁核材料修復(fù)的上頜前磨牙抗折強(qiáng)度及斷裂模式的影響。方法:將48顆上頜前磨牙隨機(jī)分組,每組8顆分為6組。A組:纖維樁核、牙本質(zhì)高度正常組;B組:鎳鉻樁核、牙本質(zhì)高度正常組;C組:纖維樁核、牙槽骨高度降低2 mm;D組:鎳鉻鑄造樁核、牙槽骨高度降低2 mm;E組:纖維樁核、牙槽骨高度降低4 mm;F組:鎳鉻樁核、牙槽骨高度降低4 mm。所有實(shí)驗(yàn)組均用鎳鉻合金鑄造冠修復(fù)。修復(fù)完成后,測試各組離體牙的斷裂載荷并觀察其斷裂模式。結(jié)果:各組斷裂載荷分別為:A組:(762.49±84.91)N;B組:(794.26±72.61)N;C組:(517.69±80.30)N;D組:(543.50±62.88)N;E組:(219.91±43.20)N;F組:(196.16±41.08)N。A組和B組的斷裂載荷顯著高于C組和D組,后二者的斷裂載荷則顯著高于E組和F組。A組和B組、C組和D組以及E組和F組之間的斷裂載荷差異均無統(tǒng)計(jì)學(xué)意義。各組斷裂模式中,出現(xiàn)可修復(fù)根折的比例分別為:A組100.0%,B組50.0%,C組75.0%,D組12.5%,E組50.0%,F組0。結(jié)論:牙槽骨高度對樁核修復(fù)的上頜前磨牙的抗折強(qiáng)度有顯著的影響,隨著牙槽骨高度的降低,患牙的抗折強(qiáng)度隨之降低,牙槽骨高度降低的量越大,患牙抗折強(qiáng)度下降的幅度也越大。牙槽骨高度對樁核冠修復(fù)的上頜前磨牙的斷裂模式也有影響,牙槽骨高度越降低,斷裂模式也越趨于不可修復(fù)根折的模式。不同樁核材料對牙槽骨高度降低時(shí)的抗折強(qiáng)度沒有顯著影響,但纖維樁核使得斷裂模式多為可修復(fù)根折的模式。
[Abstract]:Objective: to study the effect of reduction of alveolar bone height on fracture strength and fracture mode of maxillary premolars repaired with different post and core materials. Methods: 48 maxillary premolars were randomly divided into 6 groups: group A: fibrous post core, group B with normal dentin height, group C with normal dentin height and group C with fibrous post core. In group D, the height of alveolar bone was reduced by 2 mm and 2 mm respectively. In group E, the height of alveolar bone was reduced by 2 mm and 4 mm respectively. In group F, the height of alveolar bone was reduced by 4 mm, and the height of alveolar bone was decreased by 4 mm. All the experimental groups were repaired with nickel-chromium alloy cast crown. After repair, the fracture load and fracture mode of each group were measured. Results: the fracture load in group 1 was 762. 49 鹵84.91 in group A, respectively. The fracture load in group B was significantly higher than that in group C (517.69 鹵80.30). The fracture load in group B was significantly higher than that in group C and group D. (519.91 鹵43.20 鹵46.16 鹵41.08)N.A) and group B (P < 0.05), and the fracture load in group B was significantly higher than that in group C and group D (517.69 鹵80.30 鹵80.30 鹵517.69 鹵80.30 鹵517.69 鹵80.30) respectively, and the fracture load in group B was significantly higher than that in group C and group D. The fracture load of the latter two groups was significantly higher than that of group E, group F, group A, group B, group C and group D, and the difference of fracture load between group E and group F was not statistically significant. In each fracture model, the percentage of repairable root fracture in group A was 100.0and that in group B was 50.0 and that in group C was 75.0 and that in group D was 12.50.The rate of repairable root fracture was 50.0 in group E and 50.0in group F, respectively. Conclusion: the height of alveolar bone has a significant effect on the fracture strength of maxillary premolars repaired by post and core. With the decrease of alveolar bone height, the bending strength of affected teeth decreases, and the reduction of alveolar bone height increases. The greater the extent of the decrease in the strength of the affected teeth. The height of alveolar bone also affected the fracture mode of maxillary premolar repaired by post and core crown. The lower the height of alveolar bone was, the more the fracture mode became irreparable. Different pile and core materials have no significant effect on the fracture strength of alveolar bone when the height of alveolar bone is reduced, but the fracture mode of fiber post core is mostly the model of repairable root fracture.
【作者單位】： 北京大學(xué)口腔醫(yī)學(xué)院·口腔醫(yī)院修復(fù)科;
【分類號】：R783.3

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1 劉詩銘;劉玉華;徐軍;;牙槽骨高度對上頜前磨牙樁核冠修復(fù)后應(yīng)力分布的影響[J];北京大學(xué)學(xué)報(bào)(醫(yī)學(xué)版);2013年01期

【共引文獻(xiàn)】

中國期刊全文數(shù)據(jù)庫 前9條

1 陳紅莉;韓耀倫;史洋;;粘固劑影響樁核冠修復(fù)上頜中切牙的應(yīng)力分析[J];第三軍醫(yī)大學(xué)學(xué)報(bào);2013年14期

2 周團(tuán)鋒;張相v，

本文編號：1879251