title: A comparison of the in vitro retentive strength of glass-ionomer cement, zinc-phosphate cement, and mineral trioxide aggregate for the retention of prefabricated posts in bovine incisors.
abstract: The purpose of this study was to compare the retentive strength of zinc-phosphate cement, glass-ionomer cement, and mineral trioxide aggregate (MTA) cement in the retention of prefabricated posts. The root canals of 60 bovine incisors were prepared and obturated with warm gutta-percha. Post space was prepared, the smear layer removed, and posts were luted with zinc-phosphate cement, glass-ionomer cement, or MTA. The specimens were stored at 37 degrees C and 100% humidity for 2 weeks, and then subjected to increasing axial tensile forces by an Instron machine until bond failure occurred. Data were analyzed by a one-way ANOVA and a Tukey-Kramer multiple comparison test. The retentive strengths of zinc phosphate and glass-ionomer cements were statistically equivalent, and significantly greater than MTA (p < 0.001), which suggests that zinc phosphate or glass-ionomer cement may be superior to MTA when used as luting agents for posts in endodontically treated teeth.
authors.affiliation: U.S. Army Endodontic Residency Program, Fort Gordon, GA, USA.
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Vargas
authors.forename: Frederick R
authors.initials: FR
authors.lastname: Liewehr
authors.forename: Anthony P
authors.initials: AP
authors.lastname: Joyce
authors.forename: Royce R
authors.initials: RR
authors.lastname: Runner
mesh_terms: D017607:Aluminum Compounds; D000704:Analysis of Variance; D000818:Animals; D017610:Calcium Compounds; D002417:Cattle; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D005899:Glass Ionomer Cements; D008422:Materials Testing; D010087:Oxides; D011176:Post and Core Technique; D012387:Root Canal Filling Materials; D017640:Silicates; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D015036:Zinc Phosphate Cement
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D005899:Glass Ionomer Cements; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; D015036:Zinc Phosphate Cement