title: Sealing ability of MTA and amalgam in different root-end preparations and resection bevel angles: an in vitro evaluation using marginal dye leakage.
abstract: This in vitro study evaluated the effect of different apicoectomy angles, instruments used in root-end preparation, and dental materials used in retrofilling on apical sealing. Root ends were resected at 45 or 90 degrees in 80 single-rooted teeth. For each type of apicoectomy, root-end cavities were prepared with either a round carbide #2 bur or an S12/90D ultrasonic tip. The root-end cavities in each subgroup (apicoectomy + root-end preparation) were filled with silver amalgam without zinc (Am) or with gray mineral trioxide aggregate -Angelus (MTA), and the specimens were immediately immersed in 0.2% rhodamine B for 24 h. Sealing was evaluated based on the dyed cross-sectional dentin area. Data were analyzed statistically by the Kruskal-Wallis test at 5% significance level. No group showed complete sealing of root-end areas. The only significant factor affecting microleakage was dental material, with MTA exhibiting less leakage.
authors.affiliation: Dental School, Federal University of Pelotas, Santa Maria, RS, Brazil.
authors.forename: Letícia Kirst
authors.initials: LK
authors.lastname: Post
authors.forename: Fábio Garcia
authors.initials: FG
authors.lastname: Lima
authors.forename: Cristina Braga
authors.initials: CB
authors.lastname: Xavier
authors.forename: Flávio Fernando
authors.initials: FF
authors.lastname: Demarco
authors.forename: Marília
authors.initials: M
authors.lastname: Gerhardt-Oliveira
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D001047:Apicoectomy / Q000379:methods*; D017610:Calcium Compounds / Q000737:chemistry*; D003723:Dental Amalgam / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification*; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003804:Dentin / Q000648:ultrastructure; D004338:Drug Combinations; D004867:Equipment Design; D005456:Fluorescent Dyes; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D012184:Retrograde Obturation / Q000295:instrumentation / Q000379:methods*; D012235:Rhodamines; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D017640:Silicates / Q000737:chemistry*; D013997:Time Factors; D014464:Ultrasonic Therapy / Q000295:instrumentation
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D005456:Fluorescent Dyes; D010087:Oxides; D012235:Rhodamines; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; C074417:Endo-Fill; D003723:Dental Amalgam; D006171:Gutta-Percha; C029773:rhodamine B