title: Zirconia dental implants degradation by confocal Raman microspectroscopy: analytical simulation and experiments.
abstract: Subsurface hydrothermal degradation of yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) is presented. Evaluation of low temperature degradation (LTD) phase transformation induced by aging in 3Y-TZP is experimentally studied by Raman confocal microspectroscopy. A non-linear distribution of monoclinic volume fraction is determined in depth by using different pinhole sizes. A theoretical simulation is proposed based on the convolution of the excitation intensity profile and the Beer-Lambert law (optical properties of zirconia) to compare between experiment and theory. The calculated theoretical degradation curves matche closely to the experimental ones. Surface transformation (V0) and transformation factor in depth (T) are obtained by comparing simulation and experience for each sample with nondestructive optical sectioning.
authors.affiliation: Université Paris 13, Sorbonne Paris Cité, Laboratoire CSPBAT, CNRS (UMR 7244), 74 rue Marcel Cachin, 93017, Bobigny, France.
authors.forename: Nadia
authors.initials: N
authors.lastname: Djaker
authors.forename: Claudine
authors.initials: C
authors.lastname: Wulfman
authors.forename: Michaël
authors.initials: M
authors.lastname: Sadoun
authors.forename: Marc
authors.initials: M
authors.lastname: Lamy de la Chapelle
keywords: (160.1435) Biomaterials; (170.1850) Dentistry; (170.5660) Raman spectroscopy; (180.1790) Confocal microscopy; (290.5860) Scattering, Raman