Fatigue resistance of denture teeth.

Détails

ID Serval
serval:BIB_3397EDA23441
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Fatigue resistance of denture teeth.
Périodique
Journal of the Mechanical Behavior of Biomedical Materials
Auteur(s)
Heintze S.D., Monreal D., Rousson V.
ISSN
1878-0180 (Electronic)
ISSN-L
1878-0180
Statut éditorial
Publié
Date de publication
2016
Volume
53
Pages
373-383
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
AIMS: There is no standard test to determine the fatigue resistance of denture teeth. With the increasing number of patients with implant-retained dentures the mechanical strength of the denture teeth requires more attention and valid laboratory test set-ups. The purpose of the present study was to determine the fatigue resistance of various denture teeth using a dynamic load testing machine.
METHODS: Four denture teeth were used: Bonartic II (Candulor), Physiodens (Vita), SR Phonares II (Ivoclar Vivadent) and Trubyte (Dentsply). For dynamic load testing, first upper molars with a similar shape and cusp inclination were selected. The molar teeth were embedded in cylindrical steel molds with denture base material (ProBase, Ivoclar Vivadent). Dynamic fatigue loading was carried out on the mesio-buccal cusp at a 45° angle using dynamic testing machines and 2,000,000 cycles at 2Hz in water (37 °C). Three specimens per group and load were submitted to decreasing load levels (at least 4) until all the three specimens no longer showed any failures. All the specimens were evaluated under a stereo microscope (20× magnification). The number of cycles reached before observing a failure, and its dependence on the load and on the material, has been modeled using a parametric survival regression model with a lognormal distribution. This allowed to estimate the fatigue resistance for a given material as the maximal load for which one would observe less than 1% failure after 2,000,000 cycles.
RESULTS: The failure pattern was similar for all denture teeth, showing a large chipping of the loaded mesio-buccal cusp. In our regression model, there were statistically significant differences among the different materials, with SR Phonares II and Bonartic II showing a higher resistance than Physiodens and Trubyte, the fatigue resistance being estimated at around 110 N for the former two, and at about 60 N for the latter two materials.
CONCLUSION: The fatigue resistance may be a useful parameter to assess and to compare the clinical risk of chipping and fracture of denture tooth materials.
Mots-clé
Dentures, Materials Testing, Mechanical Processes, Molar, Prosthesis Failure, Regression Analysis
Pubmed
Web of science
Création de la notice
06/10/2015 11:22
Dernière modification de la notice
03/03/2018 15:49
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