Sphere spectrophotometer versus human evaluation of tooth shade

Horn, Donald J.; Brady, J. B.; Hicks, M. Lamar

doi:10.1016/s0099-2399(98)80002-2

Cited by 113 publications

(95 citation statements)

References 9 publications

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“…8 However, their reliability may be poor because of the aging of filters, and their accuracy can be affected by the object metamerism, which occurs when a pair of objects match under one light source but do not match under one or more other light sources. 16 Although color measuring and matching performance of some types of computer-aided shade matching instruments have been reported, 7,14,15,[17][18][19] these studies were based solely on either in vitro or in vivo models. Studies considering systematic evaluations using both in vitro and in vivo methods were not identified by the authors.…”

Section: Introductionmentioning

confidence: 99%

In Vitro and In Vivo Evaluations of Three Computer-Aided Shade Matching Instruments

Yuan¹,

Sun²,

Fu³

et al. 2012

Operative Dentistry

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Shadepilot was the only instrument tested in the present study that showed high accuracy and reliability both in vitro and in vivo. As different L*a*b* values and shade matching results were reported using various instruments for the same tooth, a combination of the evaluated shade matching instruments and visual shade confirmation is recommended for clinical use. SUMMARYThis study evaluated the accuracy and reliability of three computer-aided shade matching instruments (Shadepilot, VITA Easyshade, and ShadeEye NCC) using both in vitro and in vivo models. The in vitro model included the measurement of five VITA Classical shade guides. The in vivo model utilized three instruments to measure the central region of the labial surface of maxillary right central incisors of 85 people. The accuracy and reliability of the three instruments in these two evaluating models were calculated. Significant differences were observed in the accuracy of instruments both in vitro and in vivo. No significant differences were found in the reliability of instruments between and within the in vitro and the in vivo groups. VITA Easyshade was significantly different in accuracy between in vitro and in vivo models, while no significant difference was found for the other two instruments. Shadepilot was the only , 2012, 37-3, 219-227 instrument tested in the present study that showed high accuracy and reliability both in vitro and in vivo. Significant differences were observed in the L*a*b* values of the 85 natural teeth measured using three instruments in the in vivo assessment. The pair-agreement rates of shade matching among the three instruments ranged from 37.7% to 48.2%, and the incidence of identical shade results shared by all three instruments was 25.9%. As different L*a*b* values and shade matching results were reported for the same tooth, a combination of the evaluated shade matching instruments and visual shade confirmation is recommended for clinical use.

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Section: Introductionmentioning

confidence: 99%

In Vitro and In Vivo Evaluations of Three Computer-Aided Shade Matching Instruments

Yuan¹,

Sun²,

Fu³

et al. 2012

Operative Dentistry

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“…14,15 Many methods are currently used to assess tooth color, the objective methods such as reflectance spectrophotometer analysis being the most reliable. 16,17 Spectrophotometers and colorimeters are instruments commonly used to measure the color of an object. Spectrophotometers differ from colorimeters in that they measure the reflectance of light within the entire visible spectrum, whereas colorimeters measure reflected light in only three wavelengths: red, green and blue.…”

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confidence: 99%

In vitro assessment of the effectiveness of whitening dentifrices for the removal of extrinsic tooth stains

Lima¹,

Faria-e-Silva²,

Aguiar³

et al. 2008

Braz. oral res.

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This in vitro study evaluated the effectiveness of whitening dentifrices for the removal of extrinsic tooth stains. Twenty dental blocks (4 x 4 mm), including enamel and dentine, removed from freshly extracted bovine incisors, were randomly divided into 4 groups: G1 -distilled water, G2 -Colgate, G3 -Crest Extra Whitening and G4 -Rapid White. In all specimens, the dentin was covered with colorless nail polish, and the enamel was left exposed. Next, the specimens were immersed in a solution of black tea, which was changed every 24 h, for a period of 6 days. After this period, a photo-reflectance reading was taken (Time 1) with a spectrometer. The stained specimens were then submitted to linear brushing movements (5,000 cycles) using brushes (Oral B-Soft) coupled to an automatic toothbrushing machine, under a static axial load of 200 g and with a speed of 4 movements/second, at 37°C, with the dentifrice or water being injected every 60 s. When toothbrushing ended, a second photo-reflectance reading was taken (Time 2). The results were submitted to two-criteria analysis of variance (ANOVA) and to the Tukey test (α = 0.05). When the two times for a same group were compared, Time 2 presented the highest reflectance values with statistical difference only for G3 and G4. Among the dentifrices tested, only the Rapid White group differed from the control group, presenting the highest reflectance values. Only the whitening dentifrice Rapid White was effective for the removal of extrinsic stains.

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“…28 It has already been shown that sphere spectrophotometers, such as that used in this study, provide a more accurate assessment of the color change than subjective human evaluation. 29 This equipment measures the amount of visible radiant energy reflected or transmitted by an object, one wavelength at a time for each value, chroma, and hue present in the entire visible spectrum.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the color alteration and radiopacity promoted by bismuth oxide in calcium silicate cement

et al. 2013

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Analysis of the color alteration and radiopacity promoted by bismuth oxide in calcium silicate cement Abstract: The aim of the study was to determine if the increase in radiopacity provided by bismuth oxide is related to the color alteration of calcium silicate-based cement. Calcium silicate cement (CSC) was mixed with 0%, 15%, 20%, 30% and 50% of bismuth oxide (BO), determined by weight. Mineral trioxide aggregate (MTA) was the control group. The radiopacity test was performed according to ISO 6876/2001. The color was evaluated using the CIE system. The assessments were performed after 24 hours, 7 and 30 days of setting time, using a spectrophotometer to obtain the ∆E, ∆a, ∆b and ∆L values. The statistical analyses were performed using the Kruskal-Wallis/Dunn and ANOVA/ Tukey tests (p < 0.05). The cements in which bismuth oxide was added showed radiopacity corresponding to the ISO recommendations ( > 3 mm equivalent of Al). The MTA group was statistically similar to the CSC / 30% BO group (p > 0.05). In regard to color, the increase of bismuth oxide resulted in a decrease in the ∆E value of the calcium silicate cement. The CSC group presented statistically higher ∆E values than the CSC / 50% BO group (p < 0.05). The comparison between 24 hours and 7 days showed higher ∆E for the MTA group, with statistical differences for the CSC / 15% BO and CSC / 50% BO groups (p < 0.05). After 30 days, CSC showed statistically higher ∆E values than CSC / 30% BO and CSC / 50% BO (p < 0.05). In conclusion, the increase in radiopacity provided by bismuth oxide has no relation to the color alteration of calcium silicate-based cements.

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Sphere spectrophotometer versus human evaluation of tooth shade

Cited by 113 publications

References 9 publications

In Vitro and In Vivo Evaluations of Three Computer-Aided Shade Matching Instruments

In Vitro and In Vivo Evaluations of Three Computer-Aided Shade Matching Instruments

In vitro assessment of the effectiveness of whitening dentifrices for the removal of extrinsic tooth stains

Analysis of the color alteration and radiopacity promoted by bismuth oxide in calcium silicate cement

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