不同牙本质肩领和冠根比对前磨牙残根纤维桩修复后抗折力影响的实验研究

doi:10.13591/j.cnki.kqyx.2022.09.003

口腔医学 ›› 2022, Vol. 42 ›› Issue (9): 781-784.doi: 10.13591/j.cnki.kqyx.2022.09.003

不同牙本质肩领和冠根比对前磨牙残根纤维桩修复后抗折力影响的实验研究

陈雨昕^1,2,3, 王情情⁴, 李迎梅⁴, 李欣然^1,2,3, 孟庆飞^1,2,3, 孟箭^1,2,3

1.徐州医科大学徐州临床学院,江苏徐州(221000);
2 徐州市中心医院口腔科,江苏徐州(221000);
3.徐州医科大学口腔医学院,江苏徐州(221000);
4.蚌埠医学院口腔医学院,安徽蚌埠(233030)

修回日期:2022-05-14 出版日期:2022-09-28 发布日期:2022-09-20
通讯作者: 孟箭 E-mail:mrocket@126.com
基金资助:
国家口腔疾病临床医学研究中心开放性课题(NCRCO-202101);江苏省科研与实践创新计划项目(730221034);江苏省“六个一工程”拔尖人才(LGY2020027)

Influence of different ferrule designs and crown-to-root ratios on fracture resistance of residual roots restored with a fiber post-and-core system

CHEN Yuxin, WANG Qingqing, LI Yingmei, LI Xinran, MENG Qingfei, MENG Jian

The Xuzhou Clinical College of Xuzhou Medical University, Xuzhou 221000,China

Revised:2022-05-14 Online:2022-09-28 Published:2022-09-20

摘要/Abstract

摘要： 目的探讨下颌前磨牙缺损桩核冠修复时,不同牙本质肩领和冠根比值对患牙残根抗折性能的影响。方法选取40颗完整、离体的单根管下颌第一前磨牙,常规根管治疗术后,切除颊侧釉牙骨质界上方2.0 mm以上的冠部组织,构建残根模型。样本随机分为5组,模拟牙冠延长术,进一步制备0.0、1.0、2.0、3.0、4.0 mm的剩余牙本质高度(对应A0~A4组),分别对应0.62、0.75、0.91、1.10、1.33的冠根比值,随后均采用玻璃纤维桩核钴铬合金全冠修复,并在修复体颈缘根方2.0 mm处完成树脂包埋。所有样本在实验机上于颊尖与牙长轴根方成135°加载,记录折裂时的最大载荷及断裂模式,完成统计学分析。结果 A0~A4组的折裂载荷均值分别为(0.54±0.09)、(1.03±0.11)、(1.06±0.17)、(0.85±0.11)、(0.57±0.10)kN。与高度为0.0 mm 组相比,1.0、2.0 mm的牙本质肩领且冠根比＜1时,牙体的抗折性能显著提高(P＜0.05);当牙本质肩领高度超过3.0 mm且冠根比＞1时,牙体的抗折性能显著降低(P＜0.05)。结论存留牙本质高度和冠根比的差异可显著影响残根抗折性能。当前磨牙缺损时,保留1.0~2.0 mm的牙本质高度且冠根比＜1,才能保证一定的牙体抗力。

关键词: 牙本质肩领, 冠根比, 残根, 抗折力, 纤维桩核

Abstract: Objective To investigate the influence of ferrule and crown-to-root ratio on fracture resistance of mandibular first premolars treated with prefabricated fiber post and core restoration. Methods Forty sound extracted mandibular first premolars with single root canal in each tooth, were cut 2.0 mm coronal to the buccal cemento-enamel junction for residual root models. The roots were divided into five groups (n=8) at random. Simulated surgical crown lengthening procedures were done in the cervical region of the roots to provide ferrule lengths of 0.0 mm, 1.0 mm, 2.0 mm, 3.0 mm and 4.0 mm for groups A0 to A4 respectively. The corresponding crown-to-root ratios of each group were 0.62, 0.75, 0.91, 1.10 and 1.33 respectively. A glass fiber post-and-core combined with a cast Co-Cr alloy crown was used for the restoration of each root. Each specimen was embedded to a height 2.0 mm below the crown margin from the apical surface in an acrylic resin block and was loaded in a universal testing machine at a 135° angle to its long axis. The fracture loads and fracture patterns of the specimen were recorded and analyzed by SPSS software. Results Fracture loads of A0 to A4 groups were (0.54±0.09), (1.03±0.11), (1.06±0.17), (0.85±0.11), (0.57±0.10) kN. When a 1.0-2.0 mm ferrule was prepared in the cervical region of residual root and the crown-to-root ratio was less than 1, the fracture resistance of teeth increased significantly compared with the group without ferrule (P＜0.05). When the height of ferrule was more than 3.0 mm and the crown-to-root ratio was greater than 1, the fracture resistance of teeth decreased significantly (P＜0.05). Conclusion Different ferrule heights and crown-to-root ratios can significantly affect the fracture resistance of residual teeth. To ensure a better fracture resistance of mandibular first premolars, a 1.0-2.0 mm ferrule should be prepared in the cervical root and the crown-to-root ratio of teeth after restoration should be controlled within 1.

Key words: ferrule, crown-to-root ratio, residual root, fracture resistance, fiber post and core

中图分类号:

R783.1

陈雨昕, 王情情, 李迎梅, 李欣然, 孟庆飞, 孟箭. 不同牙本质肩领和冠根比对前磨牙残根纤维桩修复后抗折力影响的实验研究[J]. 口腔医学, 2022, 42(9): 781-784.

CHEN Yuxin, WANG Qingqing, LI Yingmei, LI Xinran, MENG Qingfei, MENG Jian. Influence of different ferrule designs and crown-to-root ratios on fracture resistance of residual roots restored with a fiber post-and-core system[J]. Stomatology, 2022, 42(9): 781-784.

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不同牙本质肩领和冠根比对前磨牙残根纤维桩修复后抗折力影响的实验研究

Influence of different ferrule designs and crown-to-root ratios on fracture resistance of residual roots restored with a fiber post-and-core system

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