TY - JOUR ID - TI - A Comparison of the Effectiveness of Reciprocating System with Continuous Rotary Systems in Non-Surgical Endodontic Retreatment (An In vitro study) AU - Ayad M. Mahmoud Al-Obaidi اياد مؤيد محمود AU - Yasameen Hasan Motea ياسمين حسن مطيع PY - 2016 VL - 28 IS - 1 SP - 57 EP - 62 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: Optimal root canal retreatment was required safe and efficient removal of filling material from rootcanal. The aim of this in vitro study was to compare the efficacy of reciprocating and continuous motion of fourretreatment systems in removal of root canal filling material.Materials and Methods: Forty distal roots of the mandibular first molars teeth were used in this study, these roots wereembedded in cold clear acrylic,roots were instrumented using crown down technique and rotary ProTaper systemizeSx to size F2 ,instrumentation were done with copiousirrigation of 2.5% sodium hypochlorite and 17% buffered solutionof EDTA was used as final irrigant followed by distilledwater, roots were obturated with AH26 sealer and Protapergutta-percha point F2 and medium fine accessory gutta-percha using lateral condensation technique,roots wereleft for 7 days with 100% humidity at 37ºC in an incubator. Roots were randomly divided into four groups according totechnique used for removing the root filling material (ten teeth for each group): group I: reciprocating techniqueand Wave One system, group II: continuous technique and ProTaper retreatment system, group III: continuoustechnique and R-Endo system, group IV: continuous technique and D–RaCere treatment system. All the roots wereradiographed before and after removal of gutta-percha from both bucco-lingual and mesiodistal directions usingcustom made platform and digital radiograph system RVG to havea digitized images. The total surface area of allroot canals was measured before removal ofthe gutta-percha and the area of the remaining gutta-percha filling inthe canals after retreatment procedure from both directions. These measurements were analyzed with AdobePhotoshop CS6 software, the percentage of removed gutta-percha calculated.Results: Statistical analysis was performed and the result showed group Ihad the highest mean values in removal ofroot canal filling material in both bucco-lingual and mesiodistal direction of dental radiograph and there weresignificant difference between group I and most of the other groups ,there were non significant difference betweengroup II,group III and group IV.Conclusion: This study was showed all the used retreatment systems did notcompletely remove the root canal fillingmaterial. The reciprocating technique was most effective method for removing gutta-percha and sealer thancontinuous rotary technique

ER -