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.

Effect on the bond strengths of glass fiber posts functionalized with polydopamine after etching with hydrogen peroxide

“…These results demonstrated that the relatively greater strength of the post-composite bond appeared to be stronger than the resin cement or GFP itself due to stress transfer. A study 33) shows that GFP treated with H2O2 might not impair the mechanical strength that need to be tested in future research.…”

Effect of ascorbic acid on bond strength between the hydrogen peroxide-treated fiber posts and composite resin cores

“…[121427] Many studies have evaluated the effects of surface treatments on adhesion of fiber-reinforced posts to cores. [101112131415] Applying hydrogen peroxide on quartz fiber post is a conservative procedure for the enforcing of post-core interface. Previous studies have shown several advantages of this procedure for treatment of quartz fiber-post surfaces.…”

“…This process enhances micromechanical retention on the surface of fiber post. [11] According to a study conducted by de Sousa Menezes et al ., application of hydrogen peroxide in different concentrations improves adhesion between fiber post and composite core. [12] Elseka,[13] Yenisey,[14] and Vano[15] reported that chemical surface treatment of post surface with hydrogen peroxide increases bond strength of quartz fiber post to composite resin core.…”

Application of Resin Adhesive on the Surface of a Silanized Glass Fiber–reinforced Post and Its Effect on the Retention to Root Dentin

“…Silanes are coupling agents that can interact with both organic (resin) and inorganic (glass) phases; however, they have little ability to react with epoxy resin-based posts (4) and also great possibility to undergo hydrolysis, weakening their coupling stability (5). Consequently, studies diverge about the real benefit of silanization in improving post retention (6)(7)(8)(9)(10)(11); therefore, other substances have currently been investigated, such as resin adhesives (12), acid solutions (13)(14)(15), and hydrogen peroxide agents (16)(17)(18). Among these alternatives, the application of bleaching agents reached positive results (17,18), although there is a lack of information about the negative effects on the post structure that may occur.…”