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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of storage in artificial saliva and thermal cycling on Knoop hardness of resin denture teeth

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Author(s):
Assuncao, Wirley Goncalves [1] ; Gomes, Erica Alves [1] ; Ricardo Barao, Valentim Adelino [1] ; Barbosa, Debora Barros [1] ; Delben, Juliana Aparecida [1] ; Tabata, Lucas Fernando [1]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Jose Bonifacio, 1193, BR-16015050 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF PROSTHODONTIC RESEARCH; v. 54, n. 3, p. 123-127, JUL 2010.
Web of Science Citations: 10
Abstract

Purpose: This study aimed to evaluate the effect of different storage periods in artificial saliva and thermal cycling on Knoop hardness of 8 commercial brands of resin denture teeth. Methods: Eigth different brands of resin denture teeth were evaluated (Artplus group, Biolux group, Biotone IPN group, Myerson group, SR Orthosit group, Trilux group, Trubyte Biotone group, and Vipi Dent Plus group). Twenty-four teeth of each brand had their occlusal surfaces ground flat and were embedded in autopolymerized acrylic resin. After polishing, the teeth were submitted to different conditions: (1) immersion in distilled water at 37 +/- 2 degrees C for 48 +/- 2 h (control); (2) storage in artificial saliva at 37 +/- 2 degrees C for 15, 30 and 60 days, and (3) thermal cycling between 5 and 55 degrees C with 30-s dwell times for 5000 cycles. Knoop hardness test was performed after each condition. Data were analyzed with two-way ANOVA and Tukey's test (alpha = .05). Results: In general, SR Orthosit group presented the highest statistically significant Knoop hardness value while Myerson group exhibited the smallest statistically significant mean (P <. 05) in the control period, after thermal cycling, and after all storage periods. The Knoop hardness means obtained before thermal cycling procedure (20.34 +/- 4.45 KHN) were statistically higher than those reached after thermal cycling (19.77 +/- 4.13 KHN). All brands of resin denture teeth were significantly softened after storage period in artificial saliva. Conclusion: Storage in saliva and thermal cycling significantly reduced the Knoop hardness of the resin denture teeth. SR Orthosit denture teeth showed the highest Knoop hardness values regardless the condition tested. (C) 2010 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved. (AU)