Efeito de dois selantes de superfície na alteração colorimétrica de uma resina composta / Effect of two surface sealants on color alteration of a composite resin

Objetivo: avaliar a variação de cor entre superfícies tratadas com agentes químicos de acabamento e polimento. Métodos: Foram utilizadas resina Fill Magic (Vigodent®, Rio de Janeiro, Brasil), A2 (n=18) e A3,5 (n=18). As amostras foram fotopolimerizadas, registrado os valores de L*a*b* através da análise em um colorímetro, posteriormente, foi aplicado uma camada de selantes de superfície, BisCoverTM LV (Bisco Inc, Schaumburg, USA) e Fill Glaze (Vigodent®, Rio de Janeiro, Brasil) e novamente averiguado os valores de L*a*b*. Para o grupo controle não houve tratamento, sendo registrado os valores de L*a*b* em dois tempos distintos. Os valores referentes a varialção de cor foram submetidos à análise de variância (ANOVA) e posteriormente ao teste de Tukey. Resultados: Não houve alteração colorimétrica utilizando o selante BisCoverTM LV sobre a resina A2 e A3,5 (p>0,05). Entretanto, houve alteração colorimétrica quando utilizado Fill Glaze sobre a resina A2 e A3,5 (P=0,0021 e p=0,0020, respectivamente). Conclusão: O selante de superfície BisCoverTM LV não apresentou alteração colorimétrica, sendo ideal para utilização em restaurações estéticas em que a cor da resina deve ser mantida.

Objective: To evaluate the alteration of color (DE) among surfaces treated with liquid finish and polish system. Method: Was used Fill Magic (Vigodent®, Rio de Janeiro, Brasil), A2 (n=18) and A3.5 (n=18) composite resins. The specimens were polymerized, and was registered L*a*b* values using a colorimeter, then two surface sealants was applied: BisCoverTM LV (Bisco Inc, Schaumburg, USA) and Fill Glaze (Vigodent®, Rio de Janeiro, Brazil) and was registered L*a*b* values. For the control group was not applied surface sealant, and L*a*b* values was registered in two different moments. The DEab* values were submitted to the analysis of variance (ANOVA) and then to the Tukey test. Results: Was not observed color alteration using BisCoverTM LV in both resins A2 and A3.5 (p>0.05). However, was observed color alteration when was used Fill Glaze, in both resins A2 and A3.5 (p=0.021 and p=0.002, respectively). Conclusion: In two tested composite resins colors, the surface sealant BisCoverTM LV presented no color alteration, ideal to application in esthetic restoration, when the color should be maintaining.

Comparative Study of Glycolic Acid Peeling vs. Tretinoin Peeling in Facial Pigmentary Lesions / 대한피부과학회지

BACKGROUND: Chemical peels using glycolic acid and tretinoin are known to be safe and effective for treating facial pigmentary lesions. OBJECTIVE: We evaluated and compared the efficacy of tretinoin and glycolic acid peeling for facial pigmentary lesions by using a digital camera and L*a*b* color scale in Adobe Photoshop 5.5(R) METHODS: Thirty eight patients with facial pigmentary lesions were treated with 50% glycolic acid and 1% tretinoin peelings. The treatment was performed 2-3 times per week for a period of 2 weeks and a half. Exposure time was 2 minutes for the glycolic acid and 6 hours for the tretinoin. Before and after the treatment, pigmentary lesions were evaluated using self evaluation forms and the L*a*b* color system (Commission International de I'Eclairage) in Adobe Photoshop 5.5(r) (Adobe Systems Incorporated, USA). Corneometer (Corneometer(r) CM820, Courage Khazaka Electronic GmbH, Germany) was used for the evaluation of skin hydration before and after the treatment. RESULTS: Facial pigmentary lesions were significantly improved in 10 out of 38 patients after 50% glycolic acid peeling and in 12 out of 38 patients after 1% tretinoin peeling. The state of hydration of the treated skin improved significantly after the peeling using both 50% glycolic acid and 1% tretinoin. CONCLUSION: Topical 1% tretinoin peeling is as effective as 50% glycolic acid peeling in the treatment of facial pigmentary lesions and more frequent peeling results in quicker improvement than the previous studies without significant side effects.