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KMID : 1023820200120030140
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The Journal of Advanced Prosthodontics
2020 Volume.12 No. 3 p.140 ~ p.149
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Evaluation of the repair capacities and color stabilities of a resin nanoceramic and hybrid CAD/CAM blocks
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Bahadir Hasibe Sevilay
Bayraktar Yusuf
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Abstract
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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.
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KEYWORD
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Computer-aided design and computer-aided manufacturing (CAD/CAM), Color stability, Er,Cr:YSGG laser, Microtensile bond strength, Thermal cycle
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