Article (Scientific journals)
Intraoral low-temperature degradation of monolithic zirconia dental prostheses: Results of a prospective clinical study with ex vivo monitoring
KOENIG, Vinciane; BEKAERT, Sandrine; DUPONT, Nathalie et al.
2021In Dental Materials
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Keywords :
3Y-TZP; computer-aided design/computer-aided manufacturing; Raman spectroscopy; t-m transformation; aging; biomaterials
Abstract :
[en] Objectives: To investigate the intraoral development and kinetics of low-temperature degradation (LTD) in second-generation 3 mol.% yttria-doped tetragonal zirconia polycrystal (3Y-TZP) monolithic prostheses, as well as the influence of masticatory mechanical stress and glaze layer on it. Methods: A total of 101 posterior tooth elements were included in a prospective clinical study, which included ex vivo LTD monitoring (at baseline, 6 months, 1 year, and 2 years) using Raman spectroscopy (n=2640 monoclinic phase measurement points per evaluation time) and SEM. Four types of areas (1–2 mm2 surface, 6 on molars, and 4 on premolars) were analyzed on each element surface: occlusal, axial, glazed, or unglazed. Raman depth mapping and high-resolution SEM were performed on the selected samples. Results: LTD developed in 3Y-TZP monolithic restorations 6 months after intraoral placement and progressed with time. After two years, the tetragonal-to-monoclinic transformation was non-uniform, with the presence of localized clusters of transformed grains. In axial areas, the grain aspect was typical of the classical nucleation-growth process reported for LTD, which progresses from the surface to a depth of several tens of microns. However, in occlusal areas, tribological stress generated surface crushing and grain pull-out from the clusters, which induced an underestimation of the aging process when the evaluation was limited to monoclinic phase quantification. Glazing cannot be considered a protection against LTD. Significance: If LTD occurs in dental prostheses in the same way as in orthopedic prostheses, its clinical impact is unknown and needs to be further studied.
Research Center/Unit :
d‐BRU - Dental Biomaterials Research Unit - ULiège
Disciplines :
Dentistry & oral medicine
Author, co-author :
KOENIG, Vinciane ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
BEKAERT, Sandrine ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
DUPONT, Nathalie ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
VANHEUSDEN, Alain ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
Le Goff, Stéphane
Douillard, Thierry
Chevalier, Jérôme
Djaker, Nadia
Lamy de la Chapelle, Marc
Amiard, Frédéric
Dardenne, Nadia  ;  Université de Liège - ULiège > Département des sciences de la santé publique > Biostatistique
Wulfman, Claudine
MAINJOT, Amélie  ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
More authors (3 more) Less
Language :
English
Title :
Intraoral low-temperature degradation of monolithic zirconia dental prostheses: Results of a prospective clinical study with ex vivo monitoring
Publication date :
April 2021
Journal title :
Dental Materials
ISSN :
0109-5641
eISSN :
1879-0097
Publisher :
Elsevier, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 May 2021

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