High-temperature-pressure Polymerized Resin-infiltrated Ceramic Networks

• Published in: Journal of dental research Vol. 93; no. 1; pp. 62 - 67
• Main Authors: Nguyen, J.F., Ruse, D., Phan, A.C., Sadoun, M.J.
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 01-01-2014; SAGE PUBLICATIONS, INC
• Subjects: Aluminum Silicates - chemistry; Biocompatibility; Calorimetry, Differential Scanning; Ceramics; Ceramics - chemistry; Composite materials; Composite Resins - chemistry; Computer-Aided Design; Dental Materials - chemistry; Dental Porcelain - chemistry; Dentistry; Elastic Modulus; Ethyl carbamate; Hardness; Hot Temperature; Humans; Manufacturers; Materials Testing; Mechanical Phenomena; Mechanical properties; Methacrylates - chemistry; Microscopy, Electron, Scanning; Optical properties; Pliability; Polymerization; Polyurethanes - chemistry; Potassium Compounds - chemistry; Pressure; Research Reports; Scanning electron microscopy; Silanes - chemistry; Sintering; Statistical analysis; Stress, Mechanical; Surface Properties; Zirconium - chemistry; United States > US; polymers; prosthodontics; materials science; glass-ceramics; CAD; composite materials
• ISSN: 0022-0345; 1544-0591
• DOI: 10.1177/0022034513511972

The aim of this study was to produce composite blocks (CB) for CAD/CAM applications by high-temperature-pressure (HT/HP) polymerization of resin-infiltrated glass-ceramic networks. The effect of network sintering and the absence/presence of initiator was investigated. Mechanical properties were determined and compared with those of Paradigm MZ100 (3M ESPE) blocks and HT/HP polymerized experimental “classic” CB, in which the filler had been incorporated by conventional mixing. The networks were made   from glass-ceramic powder (VITA Zahnfabrik) formed by slip casting and were either sintered or not. They were silanized, infiltrated by urethane dimethacrylate, with or without initiator, and polymerized under HT/HP (300 MPa, 180°C) to obtain resin-infiltrated glass-ceramic network (RIGCN) CB. HT/HP polymerized CB were also made from an experimental “classic” composite. Flexural strength (σf), fracture toughness (KIC), and Vickers hardness were determined and analyzed by one- or two-way analysis of variance (ANOVA), Scheffé multiple-means comparisons (α = 0.05), and Weibull statistics (for σf). Fractured surfaces were characterized with scanning electron microscopy. The mechanical properties of RIGCN CB were significantly higher. Sintering induced significant increases in σf and hardness, while the initiator significantly decreased hardness. The results suggested that RIGCN and HT/HP polymerization could be used to obtain CB with superior mechanical properties, suitable for CAD/CAM applications.