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

Brazilian Dental Journal

Neilor Mateus Antunes Braga¹  Aline Evangelista Souza-gabriel¹  Danielle Cristine Furtado Messias¹  Fuad Jacob Abi Rached-junior¹  Camila Fávero Oliveira¹  Ricardo Gariba Silva¹  Yara T. Corrêa Silva-sousa¹ 

[1] ,University of Ribeirão Preto Dental School Ribeirão Preto SP ,Brazil

关键词: aesthetics;    dental practice;    fiber post;   

DOI  :  10.1590/S0103-64402012000600009

来源: SciELO

【 摘 要 】

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 (Al2O3). 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. Al2O3 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.

【 授权许可】

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