Effect of water exposure on the fracture toughness and flexure strength of a dental glass

• Published in: Dental materials 2001-07, Vol.17 (4), p.367-371
• Main Authors: Scherrer, Susanne S., Denry, Isabelle L., Anselm Wiskott, H.W., Belser, Urs C.
• Format: Article
• Language: English
• Subjects: Acetic Acid - chemistry; Air; Aluminum Silicates - chemistry; Ceramics - chemistry; Dental glass; Dental Materials - chemistry; Dental Polishing; Dental Porcelain - chemistry; Dentistry; Flexure strength; Fracture toughness; Glass - chemistry; Hardness; Hot Temperature; Humans; Materials Testing; Pliability; Potassium Compounds - chemistry; Statistics as Topic; Stress, Mechanical; Surface Properties; Time Factors; Water - chemistry; Water exposure
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/S0109-5641(01)00002-1

Objectives: The low fusing dental glass (Duceram LFC) has been advertised as presenting a superior chemical resistance and augmented strength after 16 h exposure to water or 4% acetic acid. The purpose of this study was to evaluate the effect of prolonged exposure to water on two mechanical properties (fracture toughness and flexure strength) of LFC. Methods: Disks and bars were mirror polished and annealed prior to aging in: (1) air (control), (2) water for 24 h at 80°C and (3) water for 8 weeks at 80°C. Fracture toughness ( K Ic) was determined by indentation fracture (IF) and indentation strength (IS) using a 19.6 N Vickers indentation load. Flexure strength values were obtained from three-point bending at 0.1 mm/min. Statistical analysis was performed using the Weibull distribution, Tukey and Bartlett tests ( P