Affiliations: Department of Dental Materials and Conservative Dentistry, Dental College, Kyungpook National University, 2-101, Dong-in Dong, Taegu, Korea | Institute for Medical and Dental Engineering. Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo, Japan | Research Center for Advanced Science and Technology, The University of Tokyo 4-6-1, Komaba, Meguro-ku, Tokyo, Japan
Note: [] Requests for reprints should be addressed to Kyo-Han Kim, c/o Teruo Kishi.
Abstract: Fracture toughness (KIC) critical stress intensity factor, and bending strength of 3 types of commercially available dental composite resins (macrofilled. hybrid and microfilled type) were determined using three point bend specimens. Acoustic Emission (AE), which is the generation of elastic wave due to the release of energy from the localized sources in material. was also detected during the fracture toughness test. Fracture surfaces were examined by scanning electron microscope. The fracture toughness values, AE patterns, and the nature of fracture surface were analyzed to understand fracture behavior of dental composite resins and fracture mechanism for each dental composite resin are proposed.
