| Autor: |
Miéssi AC; Department of Dental Materials and Prosthodontics, São Paulo State University, Araçatuba, SP, Brazil., Goiato MC, dos Santos DM, Dekon SF, Okida RC |
| Jazyk: |
angličtina |
| Zdroj: |
Brazilian dental journal [Braz Dent J] 2008; Vol. 19 (3), pp. 204-8. |
| DOI: |
10.1590/s0103-64402008000300005 |
| Abstrakt: |
The aim of this study was to evaluate the dimensional changes of denture bases made from different resins after different storage periods. For this purpose, 25 sets of plaster models/resin bases were prepared using 4 acrylic resins submitted to two types of polymerization: 1--QC-20 submitted to polymerization by microwave energy; 2--QC-20 submitted to polymerization by water hot bath; 3--Vipi Cril submitted to polymerization by water hot bath; 4--Vipi Wave submitted to polymerization by microwave energy; and 5--Onda Cryl submitted to polymerization by microwave energy. After polymerization, the specimens were sectioned for accuracy readings using a comparison microscope. Readings were taken at 3 points: the crests of the right (A) and left (B) ridges, and the median region of the palate, in 4 different periods. The data obtained were submitted to two-way ANOVA and Tukey's test at 5% significance level. The greatest distortions were found in the posterior palatal region of the base (M), with statistically significant difference (p<0.05) for the studied resins. All acrylic resins presented dimensional changes and the storage period influenced these alterations. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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