KMID : 1023820180100030211
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The Journal of Advanced Prosthodontics 2018 Volume.10 No. 3 p.211 ~ p.217
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The effect of sandblasting duration on the bond durability of dual-cure adhesive cement to CAD/CAM resin restoratives
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Tekce Neslihan
Tuncer Safa Demirci Mustafa
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Abstract
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PURPOSE: To evaluate the effect of prolonged sandblasting on the bond durability of dual-cure adhesive resin cement to computer-aided design and computer-aided manufacturing (CAD/CAM) restoratives.
MATERIALS AND METHODS: Nano-ceramic LAVA Ultimate and hybrid-ceramic VITA Enamic CAD/CAM blocks were used for this study. Each CAD/CAM block was sectioned into slabs of 4-mm thickness for the microtensile test (¥ìTBS) test and 2-mm thickness for the surface roughness test. Three groups were created according to the sandblasting protocols; group 1: specimens were sandblasted for 15 seconds, group 2: specimens were sandblasted for 30 seconds, and group 3: specimens were sandblasted for 60 seconds. After sandblasting, all specimens were luted using RelyX Ultimate Clicker. Half the specimens were subjected to ¥ìTBS tests at 24 hours, and the other half were subjected to tests after 5000 thermocycles. Additionally, a total of 96 CAD/CAM block sections were prepared for surface roughness tests and scanning electron microscopy (SEM) evaluations. The Mann-Whitney U test, Kruskal-Wallis one-way analysis of variance, and Dunn's post hoc test were used to compare continuous variables among the groups.
RESULTS: At baseline, group 1, group 2, and group 3 exhibited statistically similar ¥ìTBS results for LAVA. However, group 3 had significantly lower ¥ìTBS values than groups 1 and 2 for VITA. After 5000 thermocycles, ¥ìTBS values significantly decreased for each block (P<.05).
CONCLUSION: It is important to perform controlled sandblasting because it may affect bond strength results. Sixty seconds of sandblasting disturbs the initial ¥ìTBS values and the stability of adhesion of CAD/CAM restoratives to dual-cure adhesive resin cement for VITA Enamic.
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KEYWORD
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Computer-aided design and computer-aided manufacturing (CAD/CAM) restoratives, Dual-cure adhesive cement, Surface roughness, Microtensile bond strength
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