Because CAD/CAM interim restoration polymers demonstrate varied microstructures, the response to different surface treatments to enhance their repair bond strength may also vary. Airborne-particle abrasion is a type of surface treatment to increase the surface area and wettability of the material, resulting in intimate adaptation of the resin/restoration interface and increased the repair bond strength. The repair requires special surface treatment because the interfacial adhesion between the new resin layers and the restoration degrades over time. The concept of repair is part of the philosophy of minimally invasive dentistry, which is based on the preservation of tooth structure and aims to avoid repeated cycles of restoration. When a fractured restoration is veneered with resin composite, the size and nature of the defect must be considered when the dentist decides whether to repair or replace the restoration. These complications may lead to clinical failures and the need for additional operative treatment. The durability of these CAD /CAM restorative polymers can be compromised by technical complications such as chipping, bond failure, and wear. Although these restorations seem highly promising from a mechanical point of view, a resin composite veneering material is required for aesthetic reasons and their bonding durability in oral environments. Clinicians should consider the type of materials, simplicity of processing and bonding, mechanical properties, and oral environmental conditions when choosing long-term provisional restorative materials. Long-term provisional prostheses may present new therapeutic possibilities for maxillofacial rehabilitation, implant-supported treatments, and periodontal therapy. Due to the increased fracture strength, better stress distribution, and less abrasion of the opposing enamel, these materials are more versatile. To improve material properties beyond conventional polymerization, prefabricated polymer blanks are industrially polymerized under standardized conditions at high temperature and pressure. There are many prefabricated polymer-based CAD/CAM materials in the market that can be used to fabricate provisional restorations. Everest C-Temp and PEEK are recommended as long-term durable provisional materials for clinical use. Thermocycling had no significant effect on the repair SBS for PEEK. ConclusionsĮverest C-Temp had the highest repair SBS after an airborne abrasion particle. PEEK significantly recorded the second highest repair SBS (15.96 ± 0.18) in the SB group. Everest C-Temp significantly recorded the highest repair SBS (17.84 ± 0.19 MPa) in group SB, while the lowest repair SBS values (5.51 ± 1.14 MPa) for CAD-Temp were recorded in group C. The SB group had significantly higher repair SBS values (p < .001) compared to the other groups (C and SB-T). ANOVA and Tukey’s significant difference tests were used to evaluate the data. The shear bond strength and the mode of failure were assessed. Primer and nanohybrid repair resin composite were applied to the prepared CAD /CAM surfaces. Thirty specimens from each provisional restorative materials (CAD-Temp, Everest C-Temp, and PEEK) were divided into three groups: C: surfaces received no treatment SB: surfaces were airborne particle abraded with 50 μm aluminum oxide SB-T: surfaces received the same conditions as group SB in addition to thermocycling before and after treatment. This study was conducted to evaluate the effect of surface treatments on the repairability of three different CAD/CAM polymers for long-term provisional restorations. The surface treatment to improve the repair bond strength may vary because CAD/CAM provisional restoration polymers exhibit a variety of microstructures.
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