Optical properties and light irradiance of monolithic zirconia at variable thicknesses

Sulaiman, Taiseer A.; Abdulmajeed, Aous A.; Donovan, Terence E.; Ritter, André V.; Vallittu, Pekka K.; Närhi, Timo; Lassila, Lippo

doi:10.1016/j.dental.2015.06.016

Cited by 172 publications

(231 citation statements)

References 25 publications

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“…Light transmission has been demonstrated to be inversely correlated with zirconia thickness. 9,40,43,49 Based on Lambert's law, light transmission decreases exponentially with increasing thickness by augmenting light absorption. 50 Accordingly, TP values in the present study were expected to significantly differ between groups of thicknesses.…”

Section: Discussionmentioning

confidence: 99%

“…7,8 Despite multiple improvements in the translucency of monolithic zirconia, it is still far from being considered as an alternative to enamel or even dentin in the esthetic zones. 9 Two parameters are used to evaluate the translucency and opacity of esthetic restorative materials: Absolute translucency (T%) representing the percentage of total light transmittance and relative translucency indicating the masking ability. [10][11][12] Absolute translucency is usually assessed using radiometers or spectrophotometers that measure the total light transmitted through a specimen along with the scattered light.…”

Section: Introductionmentioning

confidence: 99%

“…[33][34][35][36][37] A very high and statistically significant correlation was found between the spectrophotometer and digital imaging analysis for all CIE L*a*b* color values. 27,38 Translucency is material-and thickness-dependent 9,39,40 and vary according to the measuring techniques. 41 Values of zirconia TP reported with spectrophotometer are highly variable and range from 0.23 to 9.66 at 1.5 mm of thickness 42 and from 15.1 to 5.5 for thicknesses varying between 0.4 and 1 mm.…”

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confidence: 99%

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Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Shamseddine¹,

Majzoub²

2017

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to compare the translucency parameter (TP) of ultratranslucent multilayered (UTML) zirconia according to thickness and layer level. Materials and methods:Rectangles of UTML zirconia with four layers [dentin layer (DEL), first transitional layer (FTL), second transitional layer (STL), and enamel layer (ENL)] and four different thicknesses (0.4, 0.6, 0.8, and 1 mm) were milled from blanks. Digital images were taken in a dark studio against white and black backgrounds under simulated daylight illumination and international commission on illumination (CIE) Lab* color values recorded using Photoshop Creative Cloud software. The TP was computed and compared according to thickness and layer level using analysis of variance (ANOVA) followed by Bonferroni post hoc analysis for multiple comparisons. Significance was set at p < 0.05. Results:In each thickness, TP values were similar between any two layers. The significant effect of thickness on the TP was observed only in the first two layers. In the DEL, translucency was significantly greater at 0.4 mm than all other thicknesses. In the FTL, differences were significant between 0.4 and 0.8 mm and between 0.4 and 1 mm. Conclusion:The investigated zirconia does not seem to show gradational changes in relative translucency from dentin to enamel levels regardless of the thickness used. Thickness affected the TP only in the first two layers with better translucency at 0.4 mm.Clinical significance: Since relative translucency does not seem to be significantly different between layers, clinicians can modify the apicocoronal positioning of the UTML layers within the restoration according to the desired Chroma without any implications on the clinically perceived translucency. While the thickness of 0.4 mm may be suggested for anterior esthetic veneers because of its higher translucency, the other thicknesses of 0.6 to 1 mm can be used to mask colored abutments in full contour restorations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Shamseddine¹,

Majzoub²

2017

The Journal of Contemporary Dental Practice

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“…However, previous studies reported that zirconia was less translucent than glass ceramic and that thicker MZRs impaired translucency and polymerization of resin cements, which resulted in poor aesthetic outcomes, decreased bonding, microleakage, and postoperative sensitivity (17,35,36). A previous study showed that light irradiance and total irradiant energy varied by brand and thickness and that the minimum amount of light irradiance for the polymerization of resin cements can be used at thicknesses less than 1.65 mm (24). One MZR was lost because of hyperesthesia, and two were lost because of pulpitis, despite the absence of complications during provisional restorations.…”

Section: Preparation Design For Natural Teethmentioning

confidence: 99%

Retrospective clinical evaluation of posterior monolithic zirconia restorations after 1 to 3.5 years of clinical service

et al. 2018

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This retrospective study analyzed clinical outcomes of monolithic zirconia restorations (MZRs) and factors related to restoration success. Patient records were searched to identify those provided MZRs (Cercon ht) for premolars or molars between April 2012 and March 2016. All MZRs were placed according to a standardized protocol. Kaplan-Meier analysis was used to assess MZR performance and failure after recall appointments at 1 year or later. In total, 101 patients received 148 MZRs. Mean duration of follow-up was 25.0 ± 9.9 months. Six MZRs required replacement: three because of pulpal complications, one because of root fracture of an abutment tooth, one because of restoration fracture, and one because the tooth was used as an abutment tooth for a fixed partial denture after root fracture of an adjacent tooth. The cumulative MZR survival (success) rate at 3.5 years was 91.5% (95% confidence interval, 82.1% to 100%). The findings of this short-term retrospective study indicate that posterior MZRs are a therapeutic option for certain patients. In addition, several clinical procedures contribute to MZR success, including preparation design and occlusal and adhesive surface treatments.

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“…Metal destekli porselen restorasyonlar konvansiyonel sabit bölümlü protezlerde uzun dönem klinik başarısı ile altın standart olarak gösterilmesine rağmen, opak metal alt yapıdan istenmeyen ışık yansıması ve özellikle ince dişeti biyotipi olan vakalarda servikalden yansıyan grimsi renk tonu nedeniyle estetik olmayan görünüme neden olmuştur 1,2 Cam iyonomer siman ve geçici simanın ise kabul edilemeyecek derecede güçsüz bir bağlantı sağladığı bildirilmiştir 9,12 . Bizim çalışmamızda da yeterli tutuculuk sağlamak amacıyla estetik kronların simantasyonu çinko polikarboksilat siman ile yapılmıştır.…”

Section: Introductionunclassified