Masking Ability of the Combined Application of Opaquers and Resin Composite on Discolored Backgrounds

Abstract

SUMMARY The aim of this study was to evaluate the masking ability of a combined application of opaquers and resin composite over discolored backgrounds: A3, A3.5, C2, C3, and C4. The groups were divided according to the opaquer brand, the number of opaquer coats (one or two), and the thickness of the resin composite layer (0.5 or 1.0 mm). The color measurements were made by a reflectance spectrophotometer (SP60, EX-Rite). The color difference between the opaquer + resin composite + background and a reference background was calculated using the CIEDE2000 formula. ANOVA and Tukey’s post hoc test (α=0.05) were used to analyze the ΔE00 mean values. A bivariate analysis was used to determine the association between dependent and independent variables. The masking ability was rated by the ΔE00 visual thresholds of acceptability and perceptibility (Excellent Match: ΔE00 ≤ 0.8; Acceptable Match: 0.8 < ΔE00 ≤1.8; Moderately Unacceptable Mismatch: 1.8 < ΔE00 ≤ 3.6; Clearly Unacceptable Mismatch: 3.6 < ΔE00 ≤ 5.4; Extremely Unacceptable Mismatch: ΔE00 > 5.4). The mean ΔE00 values ranged from 0.5 to 5.52. Masking ability was affected by the opaquer brand, thickness of the resin composite layer, and background shades. Most of the combinations that achieved either excellent or acceptable masking ability were obtained with combinations composed of one or two coats of opaquer and a 1.0-mm-thick resin composite layer for all backgrounds except C4. Acceptable results were also obtained for combinations with 0.5-mm-thick resin composite over C2, A3, and A3.5 backgrounds.

Faceta Direta De Resina Composta Utilizando Pigmentos Opacificadores Para Reabilitação Estética Anterior De Dente Escurecido: Relato De Caso

“…Dual-Cured Opaquer® Bisco, Chicago, Estados Unidos) ou ainda na forma de pó-líquido (Ex. Sinfony Opaquer®, 3M ESPE, Minesota, Estados Unidos) (14,(21)(22).…”

“…Dentre as estratégias disponíveis para estratificação com resina composta no mascaramento de dentes com alteração acentuada de cor, os pigmentos opacificadores têm sido utilizados, sendo uma alternativa eficaz e minimamente invasiva, possibilitando um menor desgaste dental para se obter o mascaramento do substrato escurecido. Dessa forma, considerando que o resultado final de uma restauração com resina composta pode variar de acordo com a cor de fundo, escolher os materiais adequados e capazes de bloquear e transmitir a luz se torna uma das etapas mais complexas das restaurações de dentes escurecidos (14)(15)(16).…”

Resin composite layering on discolored substrates ensures masking ability for monolithic ceramics

“…Also, the type of the resin composite used to overcome the discolored substrate must be considered, since different masking potential may be expected according to its filler particles, opacifiers, pigments, and matrix arrangement. 24 Some of the principal materials available for this presupposes are flowable opaque resin composites, white opaque restorative resin composites, and opaque shaded restorative resin composite used as dentin layers.…”

“…However, such resin composite thickness was not enough to mask all the evaluated substrates, indicating that thicker layers of opaque resin composite may be necessary to accomplish such demand and standardize the obtained color. Also, the type of the resin composite used to overcome the discolored substrate must be considered, since different masking potential may be expected according to its filler particles, opacifiers, pigments, and matrix arrangement 24 . Some of the principal materials available for this presupposes are flowable opaque resin composites, white opaque restorative resin composites, and opaque shaded restorative resin composite used as dentin layers.…”