fa IN VITRO COMPARISON OF GUTTA-PERCHA REMOVAL WITH H-FILE AND PROTAPER WITH OR WITHOUT CHLOROFORM اندودانتیکس Endodontics پژوهشي Research <p> <strong>Introduction:</strong></p><p>  Removal of root filling materials is one of the key steps in success of root canal retreatment. The purpose of this study was to evaluate the efficacy of H-File and ProTaper with or without chloroform in the removal of gutta-percha during retreatment of mandibular premolars. <strong></strong></p><p> <strong>Materials and Methods:</strong></p><p>  Sixty mandibular premolars with one canal, and curvatures less than 30 degrees were used in this experimental study. They were instrumented with K-files and laterally obturated with condensed gutta-percha using AH26 as the sealer and were stored in 100% humidity at 37°C for 2 weeks. The teeth were randomly divided into four groups of 15 teeth each. Removal of gutta-percha was performed with H-File and ProTaper. All techniques were used with or without chloroform. The teeth were split longitudinally and the area of remaining gutta-percha/sealer on the root canal wall was explored under stereomicroscope. Retreatment time duration was also recorded for each sample. Data were analyzed statistically by Two-way ANOVA, t-test and Tukey’s. </p><p> <strong>Results:</strong> </p><p> In all groups, no significant difference was found in remaining gutta-percha and sealer with or without using chloroform, but chloroform shortened the time of retreatment. ProTaper left significantly less remaining filling materials than H-File (P<0.05). Retreatment time was significantly different between the studied groups (P<0.001). </p><p> <strong>Conclusion:</strong></p><p>  ProTaper Ni-Ti instruments proved to be more efficient and time-saving devices for removal of gutta-percha compared to H-File in canals with no or slight curvature. </p><hr><p></p><p> <strong>Source: </strong>Iranian Endodontic Journal </p><p> <a href="Source: Iranian Endodontic Journal " target="_blank"><font color="#0000ff">Full Text</font></a></p> Chloroform; Endodontic; Gutta-percha; H-file; NiTi rotary system; Retreatment 0 0 http://idai.ir/browse.php?a_code=A-10-32-2058&slc_lang=fa&sid=1 Zohreh Khalilak 10031947532846009657 10031947532846009657 No Department of Endodontics, Dental Branch, Islamic Azad University, Tehran, Iran Mehdi Vatanpour 10031947532846009658 10031947532846009658 No Department of Endodontics, Dental Branch, Islamic Azad University, Tehran, Iran Bahareh Dadresanfar dr.bdadresanfar@gmail.com 10031947532846009659 10031947532846009659 Yes Department of Endodontics, Dental Branch, Islamic Azad University, Tehran, Iran Pouneh Moshkelgosha 10031947532846009660 10031947532846009660 No Hamidreza Nourbakhsh 10031947532846009661 10031947532846009661 No