Push-out Bond Strength of Total-etch and Self-etch Adhesive Systems with Resin Cements in Different Regional Root Canal Dentin
The purpose of this study was to compare mean push-out bond strength between total-etch and self-etch adhesive systems with resin cements (Variolink® II, Multilink Automix®) in different root canal regions; coronal, middle and apical. Thirty single-canal lower premolars were cut perpendicular to long axis at mesial CEJ level. Peeso reamers No. 2 were used to prepare all canal surfaces following by post reamer No. 2 of Fibre kleer® set with 10 mm. The specimens were randomly divided into two groups of fifteen (n=15). Group 1 fiber posts were cemented with resin cement (Variolink® II) combined with total-etch adhesive system and group 2 fiber posts were cemented with resin cement (Multilink Automix®) combined with self-etch adhesive system, then all cemented root were embedded with epoxy resin block. After 24 hours all specimens were cut into 3 sections, coronal, middle and apical which each section had 1.0±0.1 mm. in height. The push-out bond strength was measured with Instron® Universal Testing Machine with a cross-head speed 0.5 mm/min and the data was analyzed by twoway ANOVA and Tukey’s test (p< 0.05). The result showed that in the total-etch adhesive system group, the mean push-out bond strength of coronal part was significantly higher than the middle and apical parts. In self-etch system group, the mean push-out bond strength of coronal, middle and apical part were significantly different. In addition, the mean push-out bond strength of resin cement with self-etch adhesive system at apical part was found to be the lowest bond strength.
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