Fracture toughness determination of dental materials by laboratory testing and finite element models

✍ Scribed by Pidaparti, Ramana M. V. ;Beatty, Mark W.

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 558 KB
• Volume: 29
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/jbm.820290305

✦ Synopsis

This study assessed the effectiveness of finite element analysis in predicting the stress intensity factor (Klc) for three types of dental materials: a glass ionomer, a dental amalgam, and a composite resin. Laboratory tests were conducted on small single-edge notch specimens loaded in three-point bending to determine values for fracture toughness (KQ). Using the dimensions measured for each laboratory specimen, a J integral approach was employed to calculate K,, using finite element analysis. Both twodimensional plane strain and three-dimensional models were used in determining KIc for each specimen, and these values were compared to the KQ values obtained from lab-oratory tests. The results indicated that no significant differences existed between laboratory results and those obtained from both two-and three-dimensional finite element models (P > .85). For the three-dimensional model, values for K,, were found to vary across the specimen thickness, with the values at the center of the specimen closely paralleling those obtained from the two-dimensional plane strain model. It was concluded that the two-dimensional plane strain J integral technique was as effective as the three-dimensional technique in calculating values for KIc.