不同残根处理术式和肩领设计对残根抗折力影响的实验研究

发布时间：2018-04-21 00:23

本文选题：正畸牵引术 + 牙冠延长术　；参考：《华西口腔医学杂志》2014年01期

【摘要】：目的探讨不同残根处理术式(牙冠延长术和正畸牵引术)及不同肩领高度对预成碳纤维桩核修复后残根抗折力的影响。方法将56颗完整的单根管下颌第一前磨牙行根管治疗后,于颊侧釉牙骨质界上1.0 mm处截冠,制备残根模型,随机分为7组,每组8颗。A组为对照组,根颈部不制备牙本质肩领;B、C、D组分别通过模拟牙冠延长术暴露残根颈部断面并制备一定高度的肩领(1.0、2.0、3.0 mm);E、F、G组分别通过模拟正畸牵引术暴露残根颈部断面并制备肩领(1.0、2.0、3.0 mm)。所有残根均采用碳纤维桩核联合铸造全冠修复。试件自全冠颈缘完成线下2.0 mm包埋于自凝塑料中,电子万能试验机以与牙长轴成150°、横梁位移速度1.0 mm·min-1于颊尖顶加载,测定折裂载荷及折裂方式。结果 A~G组试件的折裂载荷依次为(1.13±0.15)、(1.27±0.18)、(1.02±0.11)、(1.05±0.12)、(1.63±0.14)、(1.92±0.19)、(1.93±0.15)kN。残根颈部处理方式和牙本质肩领均对残根的抗折力产生显著的影响,且两因素间存在协同作用(F=33.396,P0.001);在肩领高度相同时,采用模拟正畸牵引术组牙体的折裂载荷均显著高于采用模拟牙冠延长术组(P0.001)。各组间折裂方式无统计学差异(P=1.00)。结论采用正畸牵引术暴露残根颈部断面,并制备1.0 mm以上高度的肩领,可以更好地提高残根的抗折力。
[Abstract]:Objective to investigate the effects of different residual root treatments (crown lengthening and orthodontic traction) and different shoulder collar height on the flexural strength of residual root after pre-formed carbon fiber post and core repair. Methods 56 intact mandibular first premolars were treated with root canal, and the residual root was cut at 1.0 mm at the bone boundary of the buccal enamel tooth. The model was randomly divided into 7 groups, 8 in each group as the control group. In group D, the neck section of residual root was exposed by simulated crown lengthening, and a certain height of shoulder neck was 1.0 ~ 2.0 ~ 3.0 mm / g respectively. The neck section of residual root was exposed by simulated orthodontic traction and the neck of shoulder was 1.02.03.0 mm ~ (-1) in the group D, which was treated with analogue orthodontic traction. All residual roots were repaired by carbon fiber post-core combined with cast full crown. The specimen was embedded in self-condensing plastics by 2.0 mm under the complete line of complete crown and neck edge. The electronic universal testing machine was loaded on the buccal tip with a displacement velocity of 1. 0 mm min-1 and the longitudinal axis of the tooth was 150 掳. The fracture load and fracture mode were measured. Results the fracture load of group A was 1.13 卤0.15kN, 1.27 卤0.18kN, 1.02 卤0.11kN, 1.05 卤0.12kN, 1.63 卤0.14kN, 1.92 卤0.19kN, 1.93 卤0.15kNrespectively. The cervical treatment of residual root and dentin shoulder collar had significant effects on the flexural strength of residual root, and there was a synergistic effect between the two factors, and when the height of shoulder and collar was the same, there was a synergistic effect between the two factors. The fracture load in the simulated orthodontic traction group was significantly higher than that in the simulated crown lengthening group (P 0.001). There was no statistical difference in fracture patterns among groups. Conclusion using orthodontic traction to expose the neck section of residual root and prepare shoulder collar with height above 1.0 mm can improve the flexural strength of residual root.
【作者单位】：东南大学医学院附属徐州医院口腔科;徐州市第一人民医院口腔科;
【基金】：徐州市社会发展科技计划基金资助项目(XZZD1124) 徐州市卫生局医学科研基金资助项目(XWJ2011035)
【分类号】：R783.3

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