title: Effect of diode laser irradiation on the apical sealing of MTA retrofillings.
abstract: Apical sealing is essential for the success of paraendodontic surgery, so any procedure that may favor an adequate sealing of the apical remainder should be performed. The purpose of this study was to evaluate the influence of diode laser irradiation on the apical sealing of root-end cavities with MTA retrofillings. Root canals in twenty extracted human teeth were shaped with K-files and filled with gutta-percha. The apexes were cut off and root-end preparations were performed. The roots were divided randomly in 2 groups. Group 1 (ten specimens) was retrofilled with MTA. Group 2 was irradiated with diode laser, with 1 W for 20 seconds, on the apical surface and root end cavity before retrofilling with MTA. The specimens had their external surfaces impermeabilized with cyanoacrylate, except for the apical surface, and were then immersed in 1% rhodamine B dye for 72 h and placed in plaster stone. After that, the specimens were submitted to longitudinal abrasion until half of the root remained. The linear dye leakage was observed in these mid-roots between the root canal wall and retrofilling. The linear dye leakage was measured with Image Lab software, and the results were statistically analyzed with Student's t test. There were no statistically significant differences between the two groups (p > 0.05). The diode laser irradiation did not improve the apical sealing of MTA retrofillings under the conditions of this in vitro study.
authors.affiliation: Department of Endodontics, School of Dentistry, University of São Paulo.
authors.forename: Eliana Barbosa
authors.initials: EB
authors.lastname: de Souza
authors.forename: Crystiane Venditti Gomes
authors.initials: CV
authors.lastname: de Amorim
authors.forename: José Luiz Lage
authors.initials: JL
authors.lastname: Marques
mesh_terms: D017607:Aluminum Compounds / Q000592:standards*; D017610:Calcium Compounds / Q000592:standards*; D003763:Dental Leakage / Q000628:therapy; D003806:Dentin Permeability / Q000528:radiation effects*; D004338:Drug Combinations; D006171:Gutta-Percha / Q000592:standards; D006801:Humans; D007202:Indicators and Reagents; D007834:Lasers; D010087:Oxides / Q000592:standards*; D012184:Retrograde Obturation / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D012387:Root Canal Filling Materials / Q000592:standards*; D018915:Root Canal Preparation / Q000295:instrumentation*; D017640:Silicates / Q000592:standards*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D007202:Indicators and Reagents; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; D006171:Gutta-Percha