title: Flexural properties, morphology and bond strength of fiber-reinforced posts: influence of post pretreatment.
abstract: The aim of this study was to assess the influence of surface pretreatments of fiber-reinforced posts on flexural strength (FS), modulus of elasticity (ME) and morphology of these posts, as well as the bond strength (BS) between posts and core material. Fifty-two fiber posts (smooth and serrated) were assigned to 4 groups (n=13): no treatment (control), 10% hydrogen peroxide (HP) for 10 min (HP-10), 24% HP for 1 min (HP-24) and airborne-particle abrasion (Al(2)O(3)). To evaluate FS and ME, a 3-point bending test was performed. Three posts of each group were examined by scanning electron microscopy. Composite resin was used as the core build-up and samples were sectioned to obtain microtensile sticks. Data were analyzed by ANOVA and Tukey's test (α=0.05). For FS, significant differences were observed between posts type and surface pretreatment (p<0.05), with the highest means for the smooth posts. Al2O3 provided higher FS than HP-24. Al(2)O(3) promoted higher ME than HP-24 and control. SEM images revealed partial dissolution of the resin matrix in all treated groups. The smooth posts had higher BS and FS than serrated posts (p<0.05). Mechanical properties of the glass fiber posts and the bond strength between posts and composite material were not altered by the surface treatments, except for airborne-particle abrasion that increased the post elastic modulus.
authors: Dental School, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors: Neilor Mateus Antunes
authors: NM
authors: Braga
authors: Aline Evangelista
authors: AE
authors: Souza-Gabriel
authors: Danielle Cristine Furtado
authors: DC
authors: Messias
authors: Fuad Jacob Abi
authors: FJ
authors: Rached-Junior
authors: Camila Fávero
authors: CF
authors: Oliveira
authors: Ricardo Gariba
authors: RG
authors: Silva
authors: Yara T Corrêa
authors: YT
authors: Silva-Sousa
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D055119:Elastic Modulus; D004853:Epoxy Resins / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016877:Oxidants / Q000737:chemistry; D018583:Pliability; D011176:Post and Core Technique / Q000295:instrumentation*; D012821:Silanes / Q000737:chemistry; D012995:Solubility; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D004853:Epoxy Resins; D016877:Oxidants; D012821:Silanes; C009753:fiberglass; D014867:Water; D006861:Hydrogen Peroxide; D000537:Aluminum Oxide