Abstract

DOMINGUEZ, Sayuri; CASTILLO ANDAMAYO, Diana; RAMOS, Oswaldo  and  ROZAS, Aníbal. Tensile Bond strength evaluation between glass fiber post and resin core using different surface treatments. Rev. Estomatol. Herediana [online]. 2017, vol.27, n.3, pp.153-162. ISSN 1019-4355.  http://dx.doi.org/10.20453/reh.v27i3.3199.

The interface quality between the glass fiber post surface and core is essential to form a monoblock. If this interface is affected, a wrong distribution of occlusal forces could be caused. Objectives: To determine the bond strength between the glass fiber post and the resin core using different post surface treatments. Material and methods: The bond strength was evaluated by the traccional method. The study design was analytical, cross-sectional and experimental in vitro. The population were sterilized glass fiber posts. The sample size were 24 posts which were divided into four groups following the post surface treatment: Group I, negative control, with silane (60s); group II, positive control, with 9% hydrogen peroxide (30 volumes, 10min) followed by cleansing and silane (60s); groups III and IV, experimental groups, with phosphoric acid 37%(15s) followed by cleansing and silane(60s) and with clorhexidine 2%(60s) followed by cleansing and silane(60s). Therefore, a resin core was devised for each post, the sample was placed in the universal traction machine. The tensile force was collected in Mpa. Results: It was determined that the silane group obtained a mean of 15.38, 9% hydrogen peroxide+silane group 20.28, phosphoric acid 37%+silane group 17.08, and Clorhexidine 2% + silane group 13.44. According to the Shapiro-Wilk test, all four groups presented normal distribution (p>0.05) and following Barlett’s test, the homogeneity of variances assumption was approved (p>0.05). Through the multifactor ANOVA test, it was determined that there is statistically significant difference (p=0.0194), at least in a couple of four groups. Conclusions: There is statistically significant difference between 9% hydrogen peroxide(30 volumes, 10min)+silane(60s) group and the Clorhexidine 2% (60s)+ silane(60s) group (p=0,025). Being the former glass surface treatment, the highest bond strength.

Keywords : Chlorhexidine; hydrogen peroxide; glass fiber post.

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