TY - JOUR ID - TI - A Micro Computed Tomography Assessment of New Carrier-Based Root Canal Fillings AU - Raghad A. Al-Hashimi PY - 2015 VL - 27 IS - 4 SP - 21 EP - 24 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: The main aim of the present study is to qualify and quantify voids formation of root canals obturatedwith GuttaCore (GC) and experimental Hydroxyapatite polyethylene (HA/PE) as new carrier-based root canal fillingsby using micro computed tomography scan.Materials and methods: In the present study, eight straight single-rooted human permanent premolar teeth areselected and disinfected, then stored in distilled water. The teeth decoronated leaving a root length of 12mm each.The root canals instrumented by using crown down technique and the apical diameter of the root canal preparedto a size # 30/0.04 for achieving standardized measurements. A 5mL of 17% EDTA used to remove the smear layerfollowed by 5mL of 2.5% NaOCl and rinsing with normal saline. Then the shaped root canals were randomlysubdivided into two groups of 4 teeth each according to the carrier-based obturation system use, GuttaCore orexperimental HA/PE. Afterwards, the obturated roots stored at 37°C with 100% humidity for 72 hours to allow forcomplete setting of the sealer. Micro-CT was then scanned to quantify the voids within the root canal space. Thedata were statistically analyzed by one-way ANOVA and post hoc comparison tests (α=0.05).Results: The root canals obturated with both obturation systems, GuttaCore andexperimental HA/PE showed voidsformation, particularly at the apical third of the root canal. GC obturation showed a lower percentage of voidsvolume (1.54%) than the experimental HA/PE obturation (2.3%). The void volume percentage in the GuttaCoresystem, however, was non-significantly different (P> 0.05) in comparison with the experimental PE/HA system.Conclusions: GuttaCore and experimental HA/PE obturators exhibited voids formation within the entire root canalspace. The experimental HA/PE obturator is comparable to the GuttaCore obturator in terms of voids qualification

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