Abstract
Background and Objectives: To evaluate in vitro the fracture resistance and fracture type of computer-aided design and computer-aided manufacturing (CAD-CAM) materials. Materials and Methods: Discs were fabricated (10 × 1.5 mm) from four test groups (N = 80; N = 20 per group): lithium disilicate (LDS) group (control group): IPS e.max CAD®; zirconium-reinforced lithium silicate (ZRLS) group: VITA SUPRINITY®; polymer-infiltrated ceramic networks (PICN) group: VITA ENAMIC®; resin nanoceramics (RNC) group: LAVA™ ULTIMATE. Each disc was cemented (following the manufacturers’ instructions) onto previously prepared molar dentin. Samples underwent until fracture using a Shimadzu® test machine. The stress suffered by each material was calculated with the Hertzian model, and its behavior was analyzed using the Weibull modulus. Data were analyzed with ANOVA parametric statistical tests. Results: The LDS group obtained higher fracture resistance (4588.6 MPa), followed by the ZRLS group (4476.3 MPa) and PICN group (4014.2 MPa) without statistically significant differences (p < 0.05). Hybrid materials presented lower strength than ceramic materials, the RNC group obtaining the lowest values (3110 MPa) with significant difference (p < 0.001). Groups PICN and RNC showed greater occlusal wear on the restoration surface prior to star-shaped fracture on the surface, while other materials presented radial fracture patterns. Conclusion: The strength of CAD-CAM materials depended on their composition, lithium disilicate being stronger than hybrid materials.
Highlights
Partial coverage restorations make it possible to preserve an additional 20%–30% more dental structure than other more invasive restoration techniques, such as full coverage crowns [1].The incidence of complications, both pulp (1.3% after 12.6 years) and periodontal, is lower with inlay, onlay, and overlay incrustations than complete coverage crowns [2,3,4]
Four groups were created according to the four materials tested (Table 1): lithium disilicate (LDS) group; zirconium-reinforced lithium silicate (ZRLS) group; polymer-infiltrated ceramic networks (PICN) group; resin nanoceramics (RNC) group [12]
The present study investigated the behavior of three computer-aided design and computer-aided manufacturing (CAD-CAM) materials—VITA SUPRINITY®, VITA ENAMIC®, and LAVA ULTIMATE, in comparison with IPS e.max CAD®, on teeth prepared to expose dentin
Summary
Partial coverage restorations make it possible to preserve an additional 20%–30% more dental structure than other more invasive restoration techniques, such as full coverage crowns [1].The incidence of complications, both pulp (1.3% after 12.6 years) and periodontal, is lower with inlay, onlay, and overlay incrustations than complete coverage crowns [2,3,4]. Partial coverage restorations make it possible to preserve an additional 20%–30% more dental structure than other more invasive restoration techniques, such as full coverage crowns [1]. Computer-aided design and computer-aided manufacturing (CAD-CAM) technology has simplified the planning and fabrication procedures involved in partial coverage restorations and has lead to the development of new materials with homogeneous structures that suffer less contraction when polymerized [7,8]. CAD-CAM materials can be classified as ceramics (conventional feldspathic and high-strength ceramics) and hybrid materials [9,10,11]. To evaluate in vitro the fracture resistance and fracture type of computer-aided design and computer-aided manufacturing (CAD-CAM) materials.
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