Color perceptibility and validity of silicon carbide–based protective coatings for dental ceramics,The Journal of Prosthetic Dentistry

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Color perceptibility and validity of silicon carbide–based protective coatings for dental ceramics
The Journal of Prosthetic Dentistry ( IF 4.6 ) Pub Date : 2021-01-19 , DOI: 10.1016/j.prosdent.2020.10.023
Chaker Fares ₁ , Randy Elhassani ₂ , Fan Ren ₃ , Alexandra R Cabrera ₄ , Ingrid Chai ₅ , Dan Neal ₆ , Shu-Min Hsu ₇ , Josephine F Esquivel-Upshaw ₈

Affiliation

Graduate student, Department of Chemical Engineering, University of Florida College of Engineering, Gainesville, Fla.
Undergraduate student, Department of Chemical Engineering, University of Florida College of Engineering, Gainesville, Fla.
Distinguished Professor, Department of Chemical Engineering, University of Florida College of Engineering, Gainesville, Fla.
Dental student, Division of Prosthodontics, Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Fla.
Undergraduate student, Department of Chemistry and Biochemistry, University of California San Diego, San Diego, Calif.
Statistician, Department of Surgery, University of Florida College of Medicine, Gainesville, Fla.
Research Associate, Division of Prosthodontics, Department of Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Fla.
Professor, Division of Prosthodontics, Department of Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Fla.

Statement of problem

A silicon carbide (SiC) protective coating has been developed for dental ceramics, but whether the coated ceramics can match the classical VITA shades is unclear.

Purpose

The purpose of this observational in vitro study was to evaluate the color adaptability of SiC-coated dental ceramics by testing the hypotheses that SiC-coated disks can be fabricated to match standard tooth shades and have a perceptible color match rate of at least 50% for disks with a color difference (ΔE)<2.0. The effects of ΔE, shade hue, shade value, observer sex, years of experience, profession, and shade guide orientation on color perception were studied.

Material and methods

SiC-coated disks were fabricated to color match (ΔE_ab<3.3) all 16 VITA classical shades. Uncoated disks of each VITA shade were used as the reference materials to determine whether the SiC-coated disks were color matched to the classical VITA shade guide. Three ΔE formulas (76, 94, and 2000) were applied and compared. Participants (N=120) with an average of 22 years of experience included dental school students, dental faculty members, and dental assistants. Pseudoisochromatic plate and the Farnsworth D-15 Panel test for assessing color deficiency and color blindness were administered. Participants then attempted to match SiC-coated disks to standard shade guides arranged by value or hue. All spectrophotometer readings and color matching were conducted in a light booth with standardized daylight illumination. Statistical analysis used the Fisher's exact test to determine factors associated with improved matching performance (α=.05).

Results

A significant difference in color match rate was found between disks with ΔE<2.0 (63.9%) and ΔE≥2.0 (41.7%) (P<.001). Arranging shade by value (72.2%) instead of hue (67.2%) produced better color matching (P<.001). Sex (P=.430), profession (P=.708), and years of experience (P=.902) had no significant influence on color matching.

Conclusions

SiC-coated disks were successfully fabricated to match all VITA classical shades, and clinical visual color matching results confirmed that ΔE was a useful metric in optimizing color matching for the SiC-coated dental ceramics.

中文翻译：

用于牙科陶瓷的碳化硅基保护涂层的颜色可感知性和有效性

问题陈述

已经为牙科陶瓷开发了碳化硅 (SiC) 保护涂层，但涂层陶瓷是否可以匹配经典的 VITA 色调尚不清楚。

目的

这项观察性体外研究的目的是通过测试以下假设来评估 SiC 涂层牙科陶瓷的颜色适应性：可以制造 SiC 涂层圆盘以匹配标准牙齿颜色并且具有至少 50% 的可感知颜色匹配率。色差 (ΔE)<2.0 的圆盘。研究了ΔE、色相、色值、观察者性别、经验年限、专业和色板方向对颜色感知的影响。

材料与方法

碳化硅涂层圆盘被制造成颜色匹配（ΔE _ab<3.3) 所有 16 种 VITA 经典色调。每个 VITA 色板的未涂层圆盘用作参考材料，以确定 SiC 涂层圆盘是否与经典 VITA 色板颜色匹配。应用并比较了三个 ΔE 公式（76、94 和 2000）。平均拥有 22 年经验的参与者 (N=120) 包括牙科学校的学生、牙科教员和牙科助理。进行了伪同色板和 Farnsworth D-15 面板测试以评估色缺乏和色盲。然后，参与者尝试将涂有 SiC 的圆盘与按值或色调排列的标准色板相匹配。所有分光光度计读数和颜色匹配均在具有标准化日光照明的灯箱中进行。统计分析使用 Fisher'

结果

在 ΔE<2.0 (63.9%) 和 ΔE≥2.0 (41.7%) 的圆盘之间发现颜色匹配率存在显着差异 ( P <.001)。按值（72.2%）而不是色调（67.2%）排列阴影产生了更好的颜色匹配（P <.001）。性别 ( P =.430)、职业 ( P =.708) 和工作年限 ( P =.902) 对配色没有显着影响。