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Introdução: O polimento possui importância clinicamente comprovada na estabilidade da cor de uma restauração a resina composta, fator este com relevância no seu sucesso. A duração e a frequência em que uma restauração deve ser sujeita a polimento, é um fator pouco estudado e com alguma discordância na literatura publicada.
Objetivos: Avaliar em que medida o fator tempo de polimento influencia a estabilidade de cor de restaurações a resina composta.
Material e métodos: 75 discos de resina composta (Hri Enamel Plus, Micerium, Itália) foram criados e divididos em 5 grupos foram submetidos a diferentes tempos de polimento, usando o sistema de discos de polimento Diatech Swiss Flex Discs, Colténe, Suiça. As amostras foram imersas numa solução de pigmentação durante 30 dias e foi feita a avaliação colorimétrica ao 15º e 30º dia, através de um espetofotómetro (VITA Easyshade® Compact, Vita Zahnfabrik, Alemanha). Os resultados obtidos foram sujeitos a análise estatística através do software SPSS Statistics, versão 25.
Resultados: Os grupos em que foi realizado o dobro do tempo de polimento recomendado pelo fabricante apresentaram menor ΔL*, tendo sofrido menor redução de luminosidade e menor ΔE*, ou seja, menor variação total de cor, desde a leitura inicial até aos 30 dias de pigmentação. Não se verificaram diferenças estatisticamente significativas nos grupos em que foi realizado repolimento face ao tempo.
Disussão: Pelos resultados obtidos, obervamos que um maior tempo de polimento é essencial para a redução da capacidade de descoloração e pigmentação de uma restauração a resina composta. Porém, verificou-se que realizar um repolimento passado uma semana, pouca relevância tem no melhoramento da cor da restauração.
Conclusão: Realizar um polimento mais prolongado capacita uma restauração a resina composta de se descolorar com menos facilidade, relativamente a um polimento recomendado pelo fabricante ou a uma não realização de polimento.
Introduction: Polishing has a scientifically proven clinical relevance in the color stability of a composite restoration, this factor has immense importance in is success. the duration and frequency at which a restoration is to be subjected to polish is a factor that still is not well studied and with some discordance amongst the published literature. Objective: Evaluate to what extent the polishing time factor influences colour stability of composite resin restorations. Material and methods: 75 composite resin discs (Hri Enamel, Micerium, Italy). The specimens were immersed in a pigment solution for 30 days. Samples were placed in 5 groups and submitted to different polishing times using polishing systems (Diatech Swiss Flex Discs, Colténe), then colorimetric evaluation was performed on day 15th and 30th, with a spectrophotometer (VITA Easyshade Compact, Vita Zahnfabrik, Germany). The results obtained were statistically analysed by the SPSS Statistics software, version 25. Results: The groups that were submitted to twice the polishing time and repolished recommended by the manufacturer presented lower ΔL*, having suffered less reduction of luminosity and less ΔE, i.e. less total colour variation, from the initial reading up to the 30 days of pigmentation. Discussion: From the obtained results, we have observed that a longer polishing time is essential for the reduction of the decolourization and depigmentation capacity of a composite resin restoration. Repolishing groups presented a less relevant color variation. Conclusion - Longer polishing enables composite resin restoration to pigment more easily when compared to polish recommended by the manufacturer or not to polish.
Introduction: Polishing has a scientifically proven clinical relevance in the color stability of a composite restoration, this factor has immense importance in is success. the duration and frequency at which a restoration is to be subjected to polish is a factor that still is not well studied and with some discordance amongst the published literature. Objective: Evaluate to what extent the polishing time factor influences colour stability of composite resin restorations. Material and methods: 75 composite resin discs (Hri Enamel, Micerium, Italy). The specimens were immersed in a pigment solution for 30 days. Samples were placed in 5 groups and submitted to different polishing times using polishing systems (Diatech Swiss Flex Discs, Colténe), then colorimetric evaluation was performed on day 15th and 30th, with a spectrophotometer (VITA Easyshade Compact, Vita Zahnfabrik, Germany). The results obtained were statistically analysed by the SPSS Statistics software, version 25. Results: The groups that were submitted to twice the polishing time and repolished recommended by the manufacturer presented lower ΔL*, having suffered less reduction of luminosity and less ΔE, i.e. less total colour variation, from the initial reading up to the 30 days of pigmentation. Discussion: From the obtained results, we have observed that a longer polishing time is essential for the reduction of the decolourization and depigmentation capacity of a composite resin restoration. Repolishing groups presented a less relevant color variation. Conclusion - Longer polishing enables composite resin restoration to pigment more easily when compared to polish recommended by the manufacturer or not to polish.
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Palavras-chave
Polimento dentário Pigmentação Resina composta Estabilidade de cor Tempo de polimento Dental polishing Pigmentation Composite resin Color stability Polishing time