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.

Background and Aim ConclusionsWithin the limitations of this retrospective study, SLA surface was less osseointegration failure rate than Anodized surface and RBM surface up to 1 year of loading. But further research is needed to consider other factors comprehensively that contribute to successful osseointegration. Methods and MaterialsThe medical records of patients treated with three implant surface types of implant between 2012 and 2015 at Asan Medical Center were reviewed. The primary outcome parameters were implant osseointegration failure rate. A thorough and complete review of the medical records of the enrolled patients was performed and all data were inserted into spreadsheets (Microsoft Excel 2007, Microsoft Inc., Redmond, WA, USA). The statistical evaluation was performed by using SPSS statistics ver. 22.0 (IBM Co., Armonk, NY, US).

Background:The improvements in adhesion techniques and new cad-cam restorative materials allow us to perform predictable treatments with partial restorations following the principles of minimal invasion. The immediate dentin sealing improves adhesion in dentin exposure.