title: Dentin penetrability evaluation of three different dyes in root-end cavities filled with mineral trioxide aggregate (MTA).
abstract: The purpose of this study was to evaluate the penetration of three dyes in MTA root-end fillings. In 30 single-rooted teeth, cavities for retrofilling were prepared with an ultrasound appliance and filled with MTA. The specimens were randomly assigned to three groups (n = 10) and immersed in the following solutions: 2% methylene blue (MET), 50% silver nitrate (NIT) and 0.2% rhodamine B (ROD). Two transversal slices (1 mm) of the retrofilling region were obtained and evaluated using the Image Tool 3.0 software to obtain a quantitative evaluation (in mm2) of the dye penetration around the retrofillings. Data were submitted to statistical analysis using Students t-test. The lowest degree of dye penetration was observed for the NIT group, in both slices (p < 0.05). Dye penetration was significantly larger in the ROD group when compared to the NIT group, in both slices (p < 0.05), and to the MET group, only in slice 1 (p < 0.05). Within the limitations of this study, it was concluded that the choice of dye could influence the penetration evaluation in root-end filling studies, and that the NIT had the lowest penetration capacity in the apical dentine.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Dental School, Federal University of Pelotas.
authors.forename: Beatriz Farias
authors.initials: BF
authors.lastname: Vogt
authors.forename: Cristina Braga
authors.initials: CB
authors.lastname: Xavier
authors.forename: Flávio Fernando
authors.initials: FF
authors.lastname: Demarco
authors.forename: Marcio Schüler
authors.initials: MS
authors.lastname: Padilha
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D003763:Dental Leakage / Q000517:prevention & control*; D003786:Dental Pulp Cavity / Q000737:chemistry; D003806:Dentin Permeability; D004338:Drug Combinations; D006801:Humans; D008751:Methylene Blue / Q000032:analysis; D010087:Oxides / Q000737:chemistry*; D012184:Retrograde Obturation; D012235:Rhodamines / Q000032:analysis; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012835:Silver Nitrate / Q000032:analysis
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004396:Coloring Agents; D004338:Drug Combinations; D010087:Oxides; D012235:Rhodamines; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; D012835:Silver Nitrate; D008751:Methylene Blue