A comparative study of gap volume after retro-filling using 4 different filling materials : evaluation by micro-computed tomography

Abstract

1. Objective New materials namely, Endocem®(Maruchi, Wonju, Republic of Korea) and RetroMTA® (BioMTA, Seoul, Republic of Korea) were introduced in the market to overcome shortcomings of Mineral Trioxide Aggregate such as long setting time and wash out. The purpose of this study is to evaluate and compare the volume between the dentin and the root end filling materials which are ProRoot MTA® (Dentsply Tulsa Dental, Tulsa, OK, USA), MTA-Angelus® (Angelus, Londrina, PR, Brazil), Endocem MTA® and RetroMTA® by micro-computed tomography analysis.2. Materials and methodsFour root-end filling materials were used in the present study: ProRoot® MTA (Dentsply Tulsa Dental, Tulsa, USA), MTA Angelus® (Angelus, Londrina, Brazil), RetroMTA® (BioMTA, Seoul, Korea), EndoCem® (Maruchi, Wonju, Korea). Forty eight single rooted, extracted human teeth were instrumented with ProFile® NiTi system, oburated with gutta percha, resected their 3mm of apex, retro-prepared with a diamond bur, and retro-filled with the experimental root-end filling materials. Then, the samples were scanned with a micro-computed tomography (Skyscan 1076, SkyScan, Konitch, Belgium). Two softwares called NRecon (NRecon v1.6.3.2, SkyScan, Konitch, Belgium) and ct_An (SkyScan, Konitch, Belgium) were used to reconstruct three dimensional images of the samples and to measure the volume of the gap between tooth surface and the root-end filling materials.3. ResultMedian VG% for ProRoot, Angelus, Endocem, and RetroMTA groups were 4.72 E-03, 1.34E-03, 0.14E-03, and 0.71E-03 respectively. Kruskal-Wallis one-way analysis of variance showed that ProRoot group had the greatest gap volume percentage among the experimental groups with a significant statistical difference (p<0.05). Mann-Whitney test showed that ProRoot had greater gap volume percentage than Angelus and Endocem groups with a significant difference

(p<0.05). Other comparisons showed no significant statistical difference.4. ConclusionFrom the micro-CT analysis, ProRoot had greater gap volume percentage than Angelus and Endocem with p<0.05.