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Efeito do acido ftalimidoperoxicaproico (PAP) sobre resinas compostas
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Authors
Advisor(s)
Abstract(s)
Objetivos: Explorar os efeitos do branqueamento com o ácido ftalimidoperoxicaproico (PAP) em duas resinas compostas diferentes.
Materiais e Métodos: Foram confecionados 24 discos de compósito, a partir de duas resinas compostas: Filtek™Supreme XTE Enamel e Filtek™Z250. Cada resina composta foi dividida em dois grupos: um grupo controlo (n = 6) e um grupo experimental, submetido a branqueamento com o PAP (n = 6). Uma amostra de cada grupo controlo foi analisada em SEM para a captação de imagens da rugosidade de superfície inicial. As
restantes amostras dos grupos controlo foram avaliadas com o espectrofotómetro para o registo da cor e foram submetidas ao ensaio de microdureza de Vickers, para determinação da microdureza inicial. O PAP foi aplicado durante 15 minutos, em quatro aplicações consecutivas numa única sessão, sobre as amostras dos grupos experimentais.
Após o branqueamento, uma amostra de cada grupo foi analisada em MEV para a captação de imagens da rugosidade superficial. As restantes foram avaliadas com o espectrofotómetro para o registo da cor, e posteriormente submetidas ao ensaio de microdureza de Vickers para determinação desse parâmetro após o tratamento. Os resultados foram tratados estatisticamente, para um grau de significancia de 5%.
Resultados: A análise espectrofotométrica mostrou semelhanças nos valores de ΔE entre os grupos controlo e tratados com PAP, sem diferenças estatisticamente significativas.
A microdureza de Vickers manteve-se igualmente estável entre os grupos, sem alterações relevantes após aplicação do PAP. As imagens de MEV revelaram ligeiras alterações morfológicas na superfície das amostras tratadas, mais evidentes na resina Filtek™Z250, mas sem danos estruturais visíveis.
Conclusões: O PAP não provocou alterações significativas na cor nem na microdureza das resinas compostas testadas. As alterações superficiais observadas foram mínimas.
Estes resultados sugerem que o PAP tem um efeito neutro sobre as propriedades analisadas das resinas compostas.
Objectives To explore the effects of bleaching with phthalimidoperoxycaproic acid (PAP) on two different dental composite resins. Method and Materials: A total of 24 composite discs were fabricated using two composite resins: Filtek™Supreme XTE Enamel A3 and Filtek™Z250 A3. Each resin was divided into two groups: a control group (n = 6) and an experimental group subjected to bleaching with PAP (n = 6). One sample from each control group was analyzed by scanning electron microscopy (SEM) to capture baseline surface morphology. The remaining control samples were evaluated with a spectrophotometer to record initial color and underwent Vickers microhardness testing to determine baseline microhardness. In the experimental groups, PAP was applied for 15 minutes in four consecutive applications during a single session. After bleaching, one sample from each experimental group was examined by SEM to capture post-treatment surface morphology. The remaining samples were analyzed with a spectrophotometer to assess final color and subsequently underwent Vickers microhardness testing. These results were statistically treated for a significance of 5%. Results: Spectrophotometric analysis revealed similar ΔE values between control and PAP-treated groups, with no statistically significant differences. Vickers microhardness also remained stable between groups, with no significant changes after PAP application. SEM images showed minor morphological surface changes in treated samples, more noticeable in Filtek™Z250, but without visible structural damage. Conclusion: PAP did not cause significant changes in the color or microhardness of the tested composite resins. The observed surface alterations were minimal. These results suggest that PAP has a neutral effect on the analyzed properties of composite resins.
Objectives To explore the effects of bleaching with phthalimidoperoxycaproic acid (PAP) on two different dental composite resins. Method and Materials: A total of 24 composite discs were fabricated using two composite resins: Filtek™Supreme XTE Enamel A3 and Filtek™Z250 A3. Each resin was divided into two groups: a control group (n = 6) and an experimental group subjected to bleaching with PAP (n = 6). One sample from each control group was analyzed by scanning electron microscopy (SEM) to capture baseline surface morphology. The remaining control samples were evaluated with a spectrophotometer to record initial color and underwent Vickers microhardness testing to determine baseline microhardness. In the experimental groups, PAP was applied for 15 minutes in four consecutive applications during a single session. After bleaching, one sample from each experimental group was examined by SEM to capture post-treatment surface morphology. The remaining samples were analyzed with a spectrophotometer to assess final color and subsequently underwent Vickers microhardness testing. These results were statistically treated for a significance of 5%. Results: Spectrophotometric analysis revealed similar ΔE values between control and PAP-treated groups, with no statistically significant differences. Vickers microhardness also remained stable between groups, with no significant changes after PAP application. SEM images showed minor morphological surface changes in treated samples, more noticeable in Filtek™Z250, but without visible structural damage. Conclusion: PAP did not cause significant changes in the color or microhardness of the tested composite resins. The observed surface alterations were minimal. These results suggest that PAP has a neutral effect on the analyzed properties of composite resins.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
PAP Branqueamento Resina composta