Acoustic properties of fracture of dental restorative materials and endocrown restorations under quasi-static loading.

Objectives: (1) To investigate the properties of acoustic emission (AE) signals from fracture of dental materials and endocrown restorations during quasi-static compression using the continuous wavelet transform analysis. (2) To determine by the parameters of AE signals in which structural element of tooth-endocrown system the fracture starts.

Methods: Five restorative materials (zirconium dioxide (Prettau zirconia), ceramics (IPS e.