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KMID : 1023820130050030278
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The Journal of Advanced Prosthodontics
2013 Volume.5 No. 3 p.278 ~ p.286
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Push-out bond strengths of fiber-reinforced composite posts with various resin cements according to the root level
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Chang Hoon-Sang
Noh Young-Sin
Lee Yoon
Min Kyung-San
Bae Ji-Myung
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Abstract
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PURPOSE : The aim of this study was to determine whether the push-out bond strengths between the radicular dentin and fiber reinforced-composite (FRC) posts with various resin cements decreased or not, according to the coronal, middle or apical level of the root.
MATERIALS AND METHODS : FRC posts were cemented with one of five resin cement groups (RelyX Unicem: Uni, Contax with activator & LuxaCore-Dual: LuA, Contax & LuxaCore-Dual: Lu, Panavia F 2.0: PA, Super-Bond C&B: SB) into extracted human mandibular premolars. The roots were sliced into discs at the coronal, middle and apical levels. Push-out bond strength tests were performed with a universal testing machine at a crosshead speed of 0.5 mm/min, and the failure aspect was analyzed.
RESULTS : There were no significant differences (P>.05) in the bond strengths of the different resin cements at the coronal level, but there were significant differences in the bond strengths at the middle and apical levels (P<.05). Only the Uni and LuA cements did not show any significant decrease in their bond strengths at all the root levels (P>.05); all other groups had a significant decrease in bond strength at the middle or apical level (P<.05). The failure aspect was dominantly cohesive at the coronal level of all resin cements (P<.05), whereas it was dominantly adhesive at the apical level.
CONCLUSION : All resin cement groups showed decreases in bond strengths at the middle or apical level except LuA and Uni.
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KEYWORD
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Fiber reinforced-composite post, Resin cements, Bond strength, Root level
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