Comparison of color stability of two laminate veneers cemented to tooth surfaces with and without preparation

Abstract

ObjectiveThe aim of this study was to determine the effects of preparation vs nonpreparation of tooth surfaces and the types of porcelain laminate veneers (PLVs) on color changes after 300 hours of artificially accelerated aging (AAA).Materials and methodsForty extracted maxillary central incisors were used. The teeth were divided into four groups (n = 10) to evaluate preparation methods and porcelain types: Group A: tooth preparation with IPS e.max computer‐assisted design (CAD), group B: tooth preparation with IPS e.max press, group C: nonpreparation with IPS e.max CAD, and group D: nonpreparation with IPS e.max press. Veneers were fabricated and cemented using a dual‐polimerized cement. Initial color measurement was performed and repeated after AAA. Color changes were calculated with the CIEDE 2000 (ΔE00) formula. Color differences were analyzed with two‐way ANOVA (P < .05).ResultsThe two‐way ANOVA test showed no significant difference among the groups (P > .05). The highest color change value was observed in group C, followed by groups B, A, and D.ConclusionPreparation of veneers caused more color changes in PLVs than nonpreparation. However, IPS e.max CAD systems for fabrication of nonprepared PLVs increased the color change of the PLVs measured after AAA.Clinical SignificanceThe results provide information on the effect of the amount of preparation and the type of porcelain on color change in porcelain laminate veneers. In terms of esthetic dentistry, IPS e.max press and non‐prep treatment should be used in the anterior region, where esthetics are important.

Colour stability of stained composite resins after brushing with whitening toothpaste

“…The CIEDE2000 system is a better indicator of human perceptibility and acceptability of colour changes. 19,20 Perceptibility refers to the detection of the smallest colour difference by the human eye, whereas acceptability refers to the acceptance of the colour between a tooth and an adjacent restoration. 21 The colour changes were evaluated by comparisons with 50%:50% perceptibility and 50%:50% acceptability thresholds.…”

“…The perceptibility threshold was set at ΔE 00 > 0.8 units, and the clinical acceptability threshold was set at ΔE 00 ≤ 1.8 units for CIEDE2000. 20 External factors cause aesthetic deficiency of materials and patient dissatisfaction by changing the colour of resin materials, especially in the anterior teeth. Various colourant solutions such as coffee, cola, tea and red wine induce the colour change of materials.…”

“…The formula contains three weighting functions: chroma, lightness and hue. The CIEDE2000 system is a better indicator of human perceptibility and acceptability of colour changes 19,20 . Perceptibility refers to the detection of the smallest colour difference by the human eye, whereas acceptability refers to the acceptance of the colour between a tooth and an adjacent restoration 21 …”

Influência Da Técnica De Utilização Das Pastas De Prova (Try-In) Na Cor De Um Cimento Resinoso Fotopolimerizável / Influence of the Try-in Technique on the Color of a Light-Curing Resin Cement

“…1 As lentes de contato fazem parte do grupo de laminados cerâmicos que necessitam de um menor desgaste dental (de 0,1 a 0,7 mm de espessura) resultando em condições mais favoráveis à integridade pulpar, mais eficaz em termos estéticos e durabilidade. 3 Em contrapartida, tal espessura relativamente delgada e com certo nível de translucidez promove elevado grau de dificuldade ao operador, pois o resultado final da cor sofre influência direta da tonalidade do remanescente dental. [2][3][4] A vista disso, a fim de minimizar tais falhas, Alghazali et al 5 expõe que para estabelecer a devida escolha do sistema cerâmico, deve ser levado em consideração a espessura deste e a cor do substrato dental.…”

“…3 Em contrapartida, tal espessura relativamente delgada e com certo nível de translucidez promove elevado grau de dificuldade ao operador, pois o resultado final da cor sofre influência direta da tonalidade do remanescente dental. [2][3][4] A vista disso, a fim de minimizar tais falhas, Alghazali et al 5 expõe que para estabelecer a devida escolha do sistema cerâmico, deve ser levado em consideração a espessura deste e a cor do substrato dental. Ainda, a fim de melhorar os resultados clínicos pode-se tornar útil realizar o clareamento dental do remanescente ou então, servir-se da gama de cores dos cimentos resinosos dispostos no mercado.…”