Effect of the diameter on Cu-Al post retention.
This study compared the resistance to removal by traction of abraded cylindrical metal cast posts of Cu-Al (Goldent-LA). The posts had constant length (9 mm) and three different diameters (0.9, 1.3 and 1.7 mm), and were cemented with zinc phosphate cement. The crowns of 36 sound maxillary canines were sectioned, the roots were immersed in resin blocks and the root canals were endodontically treated. The teeth were divided into three groups to be prepared and standardized with the use of a parallelometer with the following burs: Group 1 Largo n. 2; Group 2--Largo n. 4; Group 3--Largo n. 6. The posts were molded with chemically activated resin and after casting they were abraded and their dimensions were confirmed with a digital caliper. After cementation of the posts in the prepared root canals, the samples were kept at 37 degrees C in distilled water for 7 days and subsequently submitted to the traction test in a universal testing machine (Instron 4444). The results showed no statistical difference between the groups. Diameter variation (0.9 mm, 1.3 mm and 1.7 mm) in abraded cylindrical posts cemented with zinc phosphate did not affect resistance to removal.
de Souza Filho
Celso Bernardo
CB
Department of Dentistry, University of Ribeirão Preto.
Paulino
Silvana Maria
SM
Alfredo
Edson
E
de Sousa Neto
Manoel Damião
MD
Vansan
Luiz Pascoal
LP
D000704:Analysis of Variance; D002484:Cementation / Q000379:methods*; D017268:Dental Prosthesis Retention; D006801:Humans; D011176:Post and Core Technique / Q000295:instrumentation*; D018915:Root Canal Preparation / Q000379:methods*; D013718:Tensile Strength; D015036:Zinc Phosphate Cement
D015036:Zinc Phosphate Cement