fa Radiographic assessment and chair time of rotary instruments in the pulpectomy of primary second molar teeth: a randomized controlled clinical trial کودکان Pediatric Dentistry پژوهشي Research <b> Background and aims.</b> The superiority of rotary systems has been reported in several clinical studies on permanent teeth. This study consisted of radiographic assessment and chair time of rotary instruments in the pulpectomy of primary second molar teeth. <div>  <b>Materials and methods</b>. In this randomized controlled clinical study, 46 children, 3-6 years of age, were selected. The patients were divided randomly into two groups. In the first group (group A) pulpectomy was carried out with hand instru-ments and in the second group (group B) the Rotary FlexMaster System was used. T-test and chi-squared test were used to analyze data. </div><div><b>Results</b>. The mean instrumentation time in group A was significantly more than that in group B (P<0.001). Also there was a significant difference between both groups in relation to the distance between the apex of mesial root (P<0.001) and distal root (P=0.007) and the canal filling level.</div><div><b> Conclusion</b>. Superior radiographic findings and less chair time of pulpectomy with rotary instruments in second primary molar teeth were achieved.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dental Research, Dental Clinics, Dental Prospects </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/852" target="_blank"><font color="#0000ff">Full Text</font></a></p> Primary second molars, pulpectomy, rotary system 0 0 http://idai.ir/browse.php?a_code=A-10-32-3272&slc_lang=fa&sid=1 Abbas MAkarem 100319475328460015059 100319475328460015059 No Department of Pediatric Dentistry, Dental Research Center and Dental School of Mashhad University of Medical Sciences, Mashhad, Iran Navid Ravandeh 100319475328460015060 100319475328460015060 No Masoumeh Ebrahimi ebrahimima@mums.ac.ir 100319475328460015061 100319475328460015061 Yes Department of Pediatric Dentistry, Dental Research Center and Dental School of Mashhad University of Medical Sciences, Mashhad, Iran