Abstract
To overcome the disadvantages of computer-aided design/computer-aided manufacturing (CAD/CAM) processed indirect restorations using glass-ceramics and other ceramics, resin nano ceramic, which has high strength and wear resistance with improved polish retention and optical properties, was introduced. The purpose of this study was to evaluate the shear bond strength and fracture pattern of indirect CAD/CAM composite blocks cemented with two self-etch adhesive cements with different curing modes. Sand-blasted CAD/CAM composite blocks were cemented using conventional resin cement, Rely X Ultimate Clicker (RXC, 3M ESPE, St. Paul, MN, USA) with Single Bond Universal (SB, 3M ESPE, St. Paul, MN, USA) for the control group or two self-adhesive resin cements: Rely X U200 (RXU, 3M ESPE, St. Paul, MN, USA) and G-CEM Cerasmart (GC, GC corporation, Tokyo, Japan). RXU and GC groups included different curing modes (light-curing (L) and auto-curing (A)). Shear bond strength (SBS) analyses were performed on all the specimens. The RXC group revealed the highest SBS and the GC A group revealed the lowest SBS. According to Tukey’s post hoc test, the RXC group showed a significant difference compared to the GC A group (p < 0.05). For the curing mode, RXU A and RXU L did not show any significant difference between groups and GC A and GC L did not show any significant difference either. Most of the groups except RXC and RXU L revealed adhesive failure patterns predominantly. The RXC group showed a predominant cohesive failure pattern in their CAD/CAM composite, LavaTM Ultimate (LU, 3M ESPE, St. Paul, MN, USA). Within the limitations of this study, no significant difference was found regarding curing modes but more mixed fracture patterns were showed when using the light-curing mode than when using the self-curing mode.
Highlights
With the development of CAD/CAM techniques, dental restorations can be made with one appointment
This nano resin ceramic material is based on the combination of nanotechnology and ceramic [2]
A group revealed the Shear bond strength (SBS) and descriptive statistics according to different curing modes are lowest SBS.inAccording
Summary
With the development of CAD/CAM techniques, dental restorations can be made with one appointment. There are two main types of materials currently available for esthetic CAD/CAM indirect restorations: glass-ceramics/ceramics and resin composites. Ceramic CAD/CAM indirect restorations have some disadvantages and limitations, such as friability and higher opposite enamel wear [1]. For compensating the disadvantages of ceramic CAD/CAM indirect restorations, resin nano ceramic (LavaTM Ultimate, 3M ESPE, St. Paul, MN, USA) was introduced for CAD/CAM restoration materials. MN, USA) was introduced for CAD/CAM restoration materials This nano resin ceramic material is based on the combination of nanotechnology and ceramic [2]. It contains a blend of three fillers, silica and zirconia nanoclusters and individual
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