Thickness and internal adjustment of monolithic resin composite milled crowns: Effect on the load-bearing capacity under fatigue

Mechanical Behavior of Repaired Monolithic Crowns: A 3D Finite Element Analysis

“…A data analysis was performed using computer-aided engineering software. The Young modulus of each restorative and repair material [8,[19][20][21] was used for each solid considering an isotropic and linear behavior (Table 1). The contacts were considered perfectly bonded.…”

“…To determine the risk of failure for each group, an in vitro shear bond strength test was carried out. Fifteen discs were obtained from each restorative material (TZ-IPS e.max ZirCAD MT, Ivoclar AG; LD-IPS emax CAD, Ivoclar AG; RC-Tetric CAD, Ivoclar AG) from CAD-CAM blocks according to methodological steps described in previous studies [8,20]. The blocks were turned into cylinders (Ø = 10 mm) with the use of a grinding machine (ECOMET Grinder/Polisher, Buehler, Lake Bluff, IL, USA) first with a diamond grinding disc (Dia-Grid Diamond Discs #120-average grit size: 160 µm, Allied High Tech Products, Inc. Rancho Dominguez, Los Angeles, CA, USA) and then with Silicon Carbide (SiC) papers in the sequence of #400 and #600 grit size.…”

“…Before the application of the repair resin composites, different surface treatments were performed on the bonding surface of the restorative specimens according to the manufacturer's instructions for each material. Translucent zirconia and CAD-CAM resin composite discs were air-abraded with alumina particles (50 µm gran size) for 10s at 2 bar of pressure [8,20]. A 10-metacriloiloxidecil di-hydrogenic phosphate (10-MDP) primer (Alloy Primer, Kuraray Noritake) was then applied over the zirconia surface for 10 s, followed by a gentle air drying.…”

“…In the search for overcoming the inherent brittleness of traditional crowns and ensuring a consistent stress distribution, the utilization of materials mimicking Young's modulus of dentin has emerged as a fundamental strategy in the field of dental materials. Among these materials, CAD-CAM resin composites have emerged as a promising alternative, gaining significant popularity among dental professionals [7,8]. What sets these composites apart is their remarkable combination of mechanical strength and aesthetic characteristics.…”

“…What sets these composites apart is their remarkable combination of mechanical strength and aesthetic characteristics. Studies have consistently shown promising mechanical behavior, indicating their structural integrity and durability under various stress conditions [8]. Moreover, these resin composites exhibit excellent optical properties, which can be properly merged with natural teeth to enhance the overall aesthetic appearance of dental restorations [7].…”