Effect of ageing and immersion in different beverages on properties of denture lining materials

Autor(es)

Leite, Vanessa M. F. ^[1] ; Pisani, Marina X. ^[1] ; Paranhos, Helena F. O. ^[1] ; Souza, Raphael F. ^[1] ; Silva-Lovato, Claudia H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Dent Mat & Prosthodont, Ribeirao Preto Dent Sch, BR-14049 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Oral Science; v. 18, n. 4, p. 372-378, JUL-AUG 2010.
• Citações Web of Science: 11

Resumo

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 AND METHODS: 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. (AU)

• Processo FAPESP: 07/51712-0 - Estabilidade de cor e dureza de dois reembasadores resilientes obtidos pelas técnicas direta e indireta, após envelhecimento e imersão em diferentes soluções
• Beneficiário: Vanessa Maria Fagundes Leite
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica