title: Removal resistance of glass-fiber and metallic cast posts with different lengths.
abstract: This study evaluated the strength required to remove glass-fiber and metallic cast posts with different lengths. Sixty endodontically treated canines were included and their roots were embedded in acrylic resin after discarding the crowns. Samples were randomly assigned to 3 groups according to the post length (n = 20): I- 6 mm, II - 8 mm and III- 10 mm. Each group was divided into 2 subgroups based on the post material (n = 10): A- glass fiber or B- metallic cast. Post-space was prepared with Fibrekor Post Kit attached to a parallelometer. In subgroup A, prefabricated glass fiber posts from Fibrekor Post Kit were utilized. In metallic post group (subgroup B), an impression of post space was obtained, followed by casting. All posts were luted with Panavia F cement. A universal testing machine determined the force required to dislodge each post. ANOVA analysis indicated significant differences (P < 0.01) among post length. Tukey test showed that posts with 10 mm-length showed higher resistance on removal than posts with 6 mm-length. Posts with 8 mm-length did not exhibit difference when compared to 6 and 10 mm posts. No significant differences (P > 0.05) were observed between the tested post materials. It was concluded that the type of post did not influence the removal resistance and that posts with 10 mm-length required greater force to be dislodged.
authors.affiliation: Department of Dentistry, Ribeirão Preto School of Dentistry, University of Ribeirão Preto (UNAERP), Brazil.
authors.forename: Neilor Mateus Antunes
authors.initials: NM
authors.lastname: Braga
authors.forename: Silvana Maria
authors.initials: SM
authors.lastname: Paulino
authors.forename: Edson
authors.initials: E
authors.lastname: Alfredo
authors.forename: Manoel Damião
authors.initials: MD
authors.lastname: Sousa-Neto
authors.forename: Luiz Pascoal
authors.initials: LP
authors.lastname: Vansan
mesh_terms: D000535:Aluminum; D000704:Analysis of Variance; D002484:Cementation / Q000379:methods; D003188:Composite Resins; D003300:Copper; D003481:Cuspid; D003722:Dental Alloys; D001840:Dental Bonding / Q000379:methods*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D020878:Device Removal; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; C113550:FiberKor, sculpture; C438843:Panavia-Fluoro; D019279:Resin Cements; D003300:Copper; D000535:Aluminum