Wear of two denture teeth materials in vivo-2-year results.

Détails

ID Serval
serval:BIB_DAA4C46B2C0D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Wear of two denture teeth materials in vivo-2-year results.
Périodique
Dental Materials
Auteur(s)
Heintze S.D., Zellweger G., Sbicego S., Rousson V., Muñoz-Viveros C., Stober T.
ISSN
1879-0097 (Electronic)
ISSN-L
0109-5641
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
29
Numéro
9
Pages
e191-e204
Langue
anglais
Notes
Publication types: Journal ArticlePublication Status: ppublish
Résumé
OBJECTIVE: (1) To quantify wear of two different denture tooth materials in vivo with two study designs, (2) to relate tooth variables to vertical loss.
METHODS: Two different denture tooth materials had been used (experimental material=test; DCL=control). In study 1 (split-mouth, 6 test centers) 60 subjects received complete dentures, in study 2 (two-arm, 1 test center) 29 subjects. In study 1 the mandibular dentures were supported by implants in 33% of the subjects, in study 2 only in 3% of the subjects. Impressions of the dentures were taken and poured with improved stone at baseline and after 6, 12, 18 and 24 months. Each operator evaluated the wear subjectively. Wear analysis was carried out with a laser scanning device. Maximal vertical loss of the attrition zones was calculated for each tooth cusp and tooth. A mixed linear model was used to statistically analyse the logarithmically transformed wear data.
RESULTS: Due to drop-outs and unmatchable casts, only 47 subjects of study 1 and 14 of study 2 completed the 2-year recall. Overall, 75% of all teeth present could be analysed. There was no statistically difference in the overall wear between the test and control material for either study 1 or study 2. The relative increase in wear over time was similar in both study designs. However, a strong subject effect and center effect were observed. The fixed factors included in the model (time, tooth, center, etc.) accounted for 43% of the variability, whereas the random subject effect accounted for another 30% of the variability, leaving about 28% of unexplained variability. More wear was consistently recorded in the maxillary teeth compared to the mandibular teeth and in the first molar teeth compared to the premolar teeth and the second molars. Likewise, the supporting cusps showed more wear than the non-supporting cusps. The amount of wear did not depend on whether or not the lower dentures were supported by implants. The subjective wear was correct in about 67% of the cases if it is postulated that a wear difference of 100μm should be subjectively detectable.
SIGNIFICANCE: The clinical wear of denture teeth is highly variable with a strong patient effect. More wear can be expected in maxillary denture teeth compared to mandibular teeth, first molars compared to premolars and supported cusps compared to non-supported cusps. Laboratory data on the wear of denture tooth materials may not be confirmed in well-structured clinical trials probably due to the large inter-individual variability.
Pubmed
Web of science
Création de la notice
20/09/2013 18:08
Dernière modification de la notice
03/03/2018 21:55
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