ABSTRACT

Background and Aim: Post and core requires removal of a portion of the gutta-percha from the root canal space. When gutta- percha is removed some factors may have a negative effect on obturating material seal. the purpose of this study  compare different methods  of  gutta  percha  removal  immediately  after obturation  on apical leakage.

Materials and Methods: Samples  randomly divided  into  4  experimental  groups (N=15)and two positive & negative control groups(n =5). In group 1 post  space were prepared immediately with counter  clock  wise rotating GG.

In  group  2  post space  were  prepared  immediately with clock  wise  rotating GG.In group 3post space were prepared immediately with post space bur. In group 4  post  space  were  prepared immediately with heat carrier . Leakage was  measured by using  bovin serum  albumin,immediately,  48 hours and 1 week after obturation. The mean of apical microleakage is evaluated by ANOVA & Post Hoc statistial analysis in each group & in different times.

Results: Heat  carrier group showed  significantly less leakage  than Other groups in all intervals (p< 0/05).Then,revers rotating GG showed less leakage  and  forward rotating GG  showed  the  greatest  leakage. The difference between these two groups was significant at immediate and  48 hours after  obturation. Post space bur  showed  more leakage than reverse rotating GG  but  less  leakage than forward rotating GG . This difference was not significant in all intervals ( p>0/05 ).

Conclusion: According to  this  study  heat  carrier  technique  recommended  for  immediate post space preparation