Effect of ageing and immersion in different beverages on properties of denture lining materials
J. appl. oral sci
;
18(4): 372-378, July-Aug. 2010. graf, tab
Article
in English
| LILACS
| ID: lil-557107
ABSTRACT
OBJECTIVES:
To evaluate the color stability and hardness of two denture liners obtained by direct and indirect techniques, after thermal cycling and immersion in beverages that can cause staining of teeth. MATERIAL ANDMETHODS:
Seventy disc-shaped specimens (18 x 3 mm) processed by direct (DT) and indirect techniques (IT) were made from Elite soft (n=35) and Kooliner (n=35) denture liners. For each material and technique, 10 specimens were subjected to thermal cycling (3,000 cycles) and 25 specimens were stored in water, coffee, tea, soda and red wine for 36 days. The values of color change, Shore A hardness (Elite soft) and Knoop hardness (Kooliner) were obtained. The data were subjected to ANOVA, Tukey's multiple-comparison test, and Kruskal-Wallis test (P<0.05).RESULTS:
The thermal cycling promoted a decrease on hardness of Kooliner regardless of the technique used (Initial 9.09± 1.61; Thermal cycling 7.77± 1.47) and promoted an increase in the hardness in the DT for Elite Soft (Initial 40.63± 1.07; Thermal cycling 43.53± 1.03); hardness of Kooliner (DT 8.76± 0.95; IT 7.70± 1.62) and Elite Soft (DT 42.75± 1.54; IT=39.30± 2.31) from the DT suffered an increase after the immersion in the beverages. The thermal cycling promoted color change only for Kooliner in the IT. Immersion in the beverages did not promote color change for Elite in both techniques. The control group of the DT of Kooliner showed a significant color change. Wine and coffee produced the greatest color change in the DT only for Elite Soft when compared to the other beverages.CONCLUSION:
The three variation factors promoted alteration on hardness and color of the tested denture lining materials.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Beverages
/
Dental Materials
/
Denture Liners
Limits:
Humans
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2010
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
University of São Paulo/BR
Similar
MEDLINE
...
LILACS
LIS