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Flexural properties, morphology and bond strength of fiber-reinforced posts: influence of post pretreatment.

Authors
  • Braga, Neilor Mateus Antunes1
  • Souza-Gabriel, Aline Evangelista
  • Messias, Danielle Cristine Furtado
  • Rached-Junior, Fuad Jacob Abi
  • Oliveira, Camila Fávero
  • Silva, Ricardo Gariba
  • Silva-Sousa, Yara T Corrêa
  • 1 Dental School, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil. , (Brazil)
Type
Published Article
Journal
Brazilian dental journal
Publication Date
Jan 01, 2012
Volume
23
Issue
6
Pages
679–685
Identifiers
PMID: 23338260
Source
Medline
License
Unknown

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.

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