Abstract
Aim: to evaluate the intra and inter-device reliability of two intraoral spectrophotometers in measuring the Commission Internationale de l’Éclairage (CIE) L*a*b* color coordinates and to compare the color difference (ΔE) between both devices. Methods: the central region of the labial surface of the maxillary central incisor of 31 participants was measured twice by each of the devices (VITA EasyShade and Degudent Shadepilot) by one examiner. CIE L*a*b* color coordinates were obtained for all teeth and ΔE was measured and compared. Intraclass correlation coefficient (ICC) and Mann-whitney U test were used to analyze the data (p<0.05). Results: inter-device reliability ICCs in measuring CIE L*a*b* color coordinates ranged between 0.08-0.49 with significant difference between devices only concerning the b coordinate (p<0.05). While intra device reliability ICCs ranged between 0.86-0.89 for VITA EasyShade and 0.81-0.86 for Degudent Shadepilot. The mean ΔE for CIE L*a*b* color coordinates of VITA EasyShade was 3.61 (±1.93) compared to 3.60 (± 1.45) for Degudent Shadepilot with insignificant difference between both devices (p>0.05). Conclusions: high intra device reliability in measuring CIE L*a*b* color coordinates was achieved particularly of Vita EasyShade, and both devices had clinically acceptable color difference (ΔE <3.7) however, inter device reliability was low to moderate. Consequently, the same spectrophotometer should be used throughout the steps of performing any tooth- colored restoration.
Highlights
Correct tooth shade selection is a vital step that significantly affects the esthetic result of tooth- colored restorations, in the anterior region[1]
Shade was recorded for the selected tooth region in each participant by one operator at the central region of its labial surface using VITA EasyShade and Degudent Shadepilot spectrophotometers in two different occasions separated by a one-hour interval
Mann-Whitney U test showed that the mean ΔE for Commission Internationale de l’Éclairage (CIE) L*a*b* color coordinates between both types of spectrophotometers were significantly indifferent (p=0.794)
Summary
Correct tooth shade selection is a vital step that significantly affects the esthetic result of tooth- colored restorations, in the anterior region[1]. Spectrophotometers convert tooth shade into color coordinates as they are operated through the Commission Internationale de l’Éclairage (CIE) L*a*b* color coordinates system (L lightness, a chromaticity along the red–green axis, and b chromaticity along the yellow–blue axis), which allow for an objective shade determination as compared to the visual method[6]. They are capable of estimating color by measuring the intensity of reflected light in all visible wavelengths[9]
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