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http://dx.doi.org/10.4047/jap.2020.12.3.140

Evaluation of the repair capacities and color stabilities of a resin nanoceramic and hybrid CAD/CAM blocks  

Bahadir, Hasibe Sevilay (Department of Restorative Dentistry, Faculty of Dentistry, Yildirim Beyazit University)
Bayraktar, Yusuf (Department of Restorative Dentistry, Faculty of Dentistry, Kirikkale University)
Publication Information
The Journal of Advanced Prosthodontics / v.12, no.3, 2020 , pp. 140-149 More about this Journal
Abstract
PURPOSE. This study evaluated the color stabilities of two computer-aided design and computer-aided manufacturing (CAD/CAM) blocks and a nanofill composite resin and the microtensile bond strength (µTBS) between the materials. MATERIALS AND METHODS. Twelve specimens of 4 mm height were prepared for both Lava Ultimate (L) and Vita Enamic (E) CAD/CAM blocks. Half of the specimens were thermocycled (10,000 cycle, 5° to 55℃) for each material. Both thermocycled and non-thermocycled specimens were surface treated with one of the three different methods (Er,Cr:YSGG laser, bur, or control). For each surface treatment group, one of the thermocycled and one of non-thermocycled specimens were restored using silane (Ceramic Primer II), universal adhesive (Single Bond Universal), and nanofill composite resin of 4-mm height (Filtek Ultimate). The other specimens were restored with the same procedure without using silane. For each group, 1 × 1 × 8 mm bar specimens were prepared using a microcutting device. Bar specimens were thermocycled (10,000 cycle, 5° to 55℃) and microtensile tests were performed. Staining of the materials in coffee solution was also compared using a spectrophotometer. Data were analyzed using one-way ANOVA, t-test and post-hoc Scheffe tests. RESULTS. µTBS were found similar between the thermocycled and non-thermocycled groups (P>.05). The highest µTBS (20.818 MPa) was found in the non-thermocycled, bur-ground, silane-applied E group. Silane increased µTBS at some E groups (P<.05). Composite resin specimens showed more staining than CAD/CAM blocks (P<.05). CONCLUSION. CAD/CAM blocks can be repaired with composite resins after proper surface treatments. Using silane is recommended in repair process. Color differences may be shown between CAD/CAM blocks and the nanofill composite after a certain time period.
Keywords
Computer-aided design and computer-aided manufacturing (CAD/CAM); Color stability; Er,Cr:YSGG laser; Microtensile bond strength; Thermal cycle;
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Times Cited By KSCI : 5  (Citation Analysis)
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