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

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°C) 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°C) 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.

One Year Clinical Evaluation of Milled BioHPP Polyetheretherketone (PEEK)-Based versus Metal Ceramic Single Crowns (Randomized Controlled Clinical Trial)

“…Meanwhile, glass ceramics are more resistant to discoloration than composite resin materials as stated by Bahadır et al in 2020. [23] This is also in accordance with Sulaya and Guttal in 2020 [10] after evaluation of patients' satisfaction of 20 PEEK crowns via questionnaire. They found 50%-60% of the participants had given a score of 5 (excellent) and around 20%-30% scored it at 4 (good) and around 10%-20% scored it at 3 (average).…”

Effect of microabrasion on the staining susceptibility of enamel: An in vitro study

“…A visible color change of 3.5 units is the standard in most clinical trials. 21 The acceptable limit of ΔE was established at 3.5 in this investigation. Color change values (ΔE) > 3.5 units could be recognized with the naked eye in all stages of the assessment across all the experimental groups.…”

Effect of different ceramic materials on debonding time with dentin using Er, Cr:YSGG laser

“…and 25% vol. polymer part (14) as resinous part of the material absorbed most of laser energy not allowing laser beam to reach the self-adhesive resin cement used which cause softening and sever damage of the ceramic surface. The absorption coefficient of laser for Vita Enamic is much higher than laser penetration (15) , for that using Er,Cr:YSGG laser for debonding such materials failed to keep the restoration.…”