根管预备程度对中国人牙根强度的影响

摘要/Abstract

摘要： ［摘要］目的探讨根管预备程度对中国人牙齿力学性能的影响。方法选取中国成人离体单根管下颌前磨牙40颗，随机分为A、B、C、D 4组，分别预备至0.04锥度#25、0.06锥度#25、0.04锥度#30、0.06锥度#30，全部常规侧方加压充填根管。置于万能力学实验机加压，记录牙根折裂时最大载荷。结果 A组（182.17±49.22）N与B组(146.28±56.54)N、C组（98.14±12.25)N与D组（86.10±29.44）N无统计学差异（P>0.05）,A组与C组、B组与D组有统计学差异（P<0.05）。结论根管预备时锥度和号数增加均会引起牙根强度的降低，但号数的变化对牙根强度影响更大。

关键词: 根管预备, 锥度, 号数, 折裂

Abstract: Abstract: Objective To discuss the effect of root canal instrumentation on mechanical characters of Chinese tooth root.Methods A total of 40 mandibular premolars with single canal extracted from Chinese adults were randomly divided into 4 groups (A,B,C,D),which were all prepared by rotary instruments up to #25 0.04 taper,#25 0.06 taper,#30 0.04 taper and #30 0.06 taper.All specimens were filled with gutta percha and AHPlus sealer with lateral condensation filling technology.The specimens were then submitted to compressive strength testing by a universal testing machine.The highest compressive strength value was recorded when each root exhibited vertical fracture.Results No significant differences were obtained either between Group A (182.17±49.22) N and Group B (146.28±56.54) N or between Group C (98.14±12.25) N and Group D (86.10±29.44) N (P >0.05).However,there were significant differences between Group A and Group C as well as Group B and Group D (P <0.05).Conclusions Increased taper and size of file tip of root canal instrumentation could lead to decreased root strength,and the size of file tip exhibited more influences.

Key words: root canal instrumentation, taper, size, fracture

中图分类号:

R781.05

王轲许可耿楠李谨. 根管预备程度对中国人牙根强度的影响[J]. 口腔医学, 2015, 35(7): 538-541.

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