title: Comparative in vitro study of the sealing efficiency of white vs grey ProRoot mineral trioxide aggregate formulas as apical barriers.
abstract: Mineral trioxide aggregate (MTA) has been proposed as one of the materials which can be used in a one-visit apexification technique. Recently conventional grey MTA has been replaced by a new white MTA formula. The aim of this study was to compare the root canal adaptation of white MTA to that of grey MTA when used as an apical barrier in teeth with open apices. We also examined whether a previous calcium hydroxide intracanal medication affects MTA's sealing ability and investigated the ability to remove calcium hydroxide from the root canal walls. Forty-nine teeth were prepared in a manner to simulate a divergent open apex of immature teeth. Four teeth were used in a preliminary experiment to demonstrate the inefficacy of calcium hydroxide removal from the canal walls in teeth with open apices. Four groups of 10 teeth each were created: groups A and B were treated with calcium hydroxide intracanal medication and then received an apical plug of grey and white MTA respectively. Groups C and D received an apical plug of grey and white MTA respectively without previous intracanal medication. Four teeth served as negative and one as a positive control. The marginal adaptation and sealing ability of the apical barrier were tested by means of a dye tracer (basic fuchsine) after longitudinal sectioning. It was found that MTA apical barrier resisted displacement during gutta-percha condensation. Calcium hydroxide pretreatment, adversely affected white MTA sealing ability (P < 0.05).
authors: Department of Endodontics, School of Dentistry, University of Athens, Athens, Greece. spstef@dent.uoa.gr
authors: Spyridon
authors: S
authors: Stefopoulos
authors: Dimitrios V
authors: DV
authors: Tsatsas
authors: Nikolaos P
authors: NP
authors: Kerezoudis
authors: George
authors: G
authors: Eliades
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry* / Q000494:pharmacology; D000704:Analysis of Variance; D017610:Calcium Compounds / Q000737:chemistry* / Q000494:pharmacology; D002126:Calcium Hydroxide / Q000009:adverse effects*; D003763:Dental Leakage / Q000209:etiology; D018772:Dental Marginal Adaptation; D003786:Dental Pulp Cavity; D004338:Drug Combinations; D006171:Gutta-Percha; D006801:Humans; D010087:Oxides / Q000737:chemistry* / Q000494:pharmacology; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000494:pharmacology; D012388:Root Canal Irrigants / Q000009:adverse effects*; D012389:Root Canal Obturation / Q000379:methods*; D017640:Silicates / Q000737:chemistry* / Q000494:pharmacology; D018709:Statistics, Nonparametric; D019227:Tooth Apex / Q000187:drug effects*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D017640:Silicates; C086631:mineral trioxide aggregate; D006171:Gutta-Percha; D002126:Calcium Hydroxide