Final Colour of Ultratranslucent Multilayered Zirconia Veneers, Effect of Thickness, and Resin Cement Shade

Abstract

Background. Aesthetic restorations should be able to mimic the natural colour depth of teeth, affected by several factors including material properties. There is a lack of information regarding the effect of cement shade and material thickness on the final colour of ultratranslucent multilayered zirconia veneers. Objectives. This study evaluated the effect of ceramic thickness and resin cement shade on the final colour of different layers of ultratranslucent multilayered (UTML) zirconia veneers. Methods. This in vitro study produced 90 rectangular-shaped specimens with nonsintered Katana UTML monolithic zirconia (Kuraray Noritake Dental, Tokyo, Japan), shade A1 blocks. Ceramic samples were prepared in two groups of 0.7 mm and 0.5 mm thicknesses, 45 of each (a: 8 × 11 × 0.5 mm ; b: 8 × 11 × 0.7 mm ). Specimens of each thickness were further divided into 5 groups: universal, clear, brown, white, and opaque ( n = 9 ). Each adhesive resin cement (Panavia V5) was applied between the ceramic samples and composite substrate. The colour values were measured using a spectrophotometer in baseline and after resin cement application according to the CIELab system. For all samples, Δ E 00 values were obtained. Data were evaluated with SPSS 25 using the three-way ANOVA test ( p < 0.05 ). Results. The factors of cement shade, ceramic thickness, and ceramic layers have statistically significant effect on Δ E 00 values ( p < 0.001 ). The results showed lower Δ E 00 values with thicker ceramic veneers. Tukey test results showed that the opaque and brown shade had a significantly greater Δ E 00 values comparing to universal ( p = 0.004 ), clear, and white shades ( p < 0.001 ). Conclusion. The colour change was greater in lower ceramic thickness. Different shades of resin cement and layers of UTML zirconia differently affected the final colour.

Veneer crowns in anterior endodontically‐treated teeth: A case report with 1‐year follow‐up

“…6,7,37,38 Studies showed translucent zirconia ultrathin veneers have satisfactory esthetics; but further long-term studies are necessary to confirm this treatment approach and there is a possibility of zirconia veneers debonding due to less effective adhesion to resin cement. 37,39,40 Limits of the present clinical presentation include the absence of an adequate population sample, the replicability of the technique and the limited follow up. In addition, the success of restorations is highly dependent on the patient's occlusal force pattern.…”

“…Although many studies have shown that durable bonding to zirconia is possible through new surface preparation methods, other studies have questioned these methods 6,7,37,38 . Studies showed translucent zirconia ultrathin veneers have satisfactory esthetics; but further long‐term studies are necessary to confirm this treatment approach and there is a possibility of zirconia veneers debonding due to less effective adhesion to resin cement 37,39,40 …”

Color Assessment of Feldspathic Ceramic with Two Different Thicknesses, Using Multiple Polymeric Cements

“…However, a spectrophotometer has been considered a precise method and is clinically available [ 36 , 41 , 49 , 55 , 57 , 58 ]. The spectrophotometer CIELab system data were obtained and analyzed through ΔE calculation formula to compare the color differences between samples [ 41 , 49 , 55 , 58 , 59 , 60 , 61 , 62 ].…”

Испытания Многослойного Диоксида Циркония На Цветоанализаторе Спектрон-М

“…Также у многослойного диоксида циркония определяли параметр прозрачности, ТР [4], коэффициент контрастности, CR [2] и опалесценцию [4]. Несколько работ посвящено изучению оптических параметров каждого слоя многослойного диоксида циркония в отдельности [5]. Кроме того, исследовали влияние толщины слоя [5] и фазового состава различных слоёв [4] на оптические свойства многослойного диоксида циркония; цвета фиксирующего цемента на окончательный цвет реставрации [5].…”

“…Несколько работ посвящено изучению оптических параметров каждого слоя многослойного диоксида циркония в отдельности [5]. Кроме того, исследовали влияние толщины слоя [5] и фазового состава различных слоёв [4] на оптические свойства многослойного диоксида циркония; цвета фиксирующего цемента на окончательный цвет реставрации [5]. Было установлено, что на точность соответствия цвета реставрации из многослойного диоксида циркония окружающим зубам влияет не только тип материала [4], но и толщина, и расположение реставрации в пределах заготовки [5], и цвет фиксирующего цемента [5].…”