›› 2015, Vol. 35 ›› Issue (7): 538-541.

• Basic Research • Previous Articles     Next Articles

The effect of root canal instrumentation on Chinese tooth root strength

  

  • Received:2015-01-23 Revised:2015-02-13 Online:2015-07-28 Published:2015-08-04

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

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