›› 2015, Vol. 35 ›› Issue (8): 685-687.

• Clinical Research • Previous Articles     Next Articles

Influence of root canal retreatment procedures on the appearance of defects on the root canal walls

  

  • Received:2014-04-08 Revised:2014-09-02 Online:2015-08-28 Published:2015-08-14
  • Contact: Ling Zhang E-mail:1544189325@QQ.com

Abstract: Objective To explore the influence of root canal retreatment procedures on the appearance of defects on the root canal walls.Methods One hundred and sixty premolars extracted for orthodontics were randomly divided into two groups with 80 in each group.They were treated and retreated a month(A group) and half a year(B group) after extraction.Forty teeth (A1 group)in A group were treated and the other 40 (A2 group) were retreated at random,and B group was divided into B1 group and B2 group in the same way.Among retreated teeth,twenty teeth filling materials were removed by ProTaper retreatment files only(A21 group,B21 group) and the other twenty teeth were removed by ProTaper retreatment files with chloroform(A22 group,B22 group).Roots were then sectioned and inspected under a microscope.Results Retreatment groups showed significantly more defects than the initial treatment group.There was difference in the appearance of defects after retreatment between ProTaper retreatment files only group and chloroformsupplied group.Conclusions Retreatment procedures result in more defects than initial treatment.When assessing the outcomes of endodontic retreatment,the substantial damage to the root canal walls should be considered.

Key words: retreatment, nickel-titanium files, root dentin

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