title: Influence of the thickness of mineral trioxide aggregate on sealing ability of root-end fillings in vitro.
abstract: The purpose of this study was to compare the ability of different thicknesses of mineral trioxide aggregate (MTA) to prevent apical leakage through the use of a protein-dye complex with Coomassie Brilliant Blue G. Sixty-four teeth were divided into 4 groups, then filled with MTA to depths of 1, 2, 3, or 4 mm. Two teeth served as the positive controls. Another 2 teeth served as the negative controls. Root-filled teeth were mounted in an apparatus and then challenged with protein solution. The evaluation was conduced at 24-hour intervals for 60 days. The 1-mm-thick MTA was the least effective in preventing apical leakage (P <.05). No significance difference was found between 2- and 3-mm-thick MTA (P >.05). Four-millimeter-thick MTA was significantly more effective than the other thicknesses tested (P <.05). The results of this study suggest that the thickness of 4 mm is most adequate for the use of MTA as a root-end filling material.
authors.affiliation: University of Brasília, Brazil. cravalois@uol.com.br
authors.forename: Caroline R A
authors.initials: CR
authors.lastname: Valois
authors.forename: Edson D
authors.initials: ED
authors.lastname: Costa
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D000704:Analysis of Variance; D001047:Apicoectomy; D017610:Calcium Compounds / Q000737:chemistry*; D002863:Chromogenic Compounds; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012394:Rosaniline Dyes; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D002863:Chromogenic Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D012394:Rosaniline Dyes; D017640:Silicates; C086631:mineral trioxide aggregate; C004692:coomassie Brilliant Blue