Influence of window size in small-window colour measurement, particularly of teeth

Bolt, René A.; Bosch, J.J. ten; Coops, Jos C.

doi:10.1088/0031-9155/39/7/006

Cited by 195 publications

(170 citation statements)

References 3 publications

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“…21 While using colorimeters and spectrophotometers have limitations related to the light beams evaluating the borders of the aperture penetrating into the semitransparent bed of the tooth, (due mainly to the nature of the tooth structure) thereby resulting in underestimation of the reflected light by the system. 22 In various studies where subjective and objective methods were used in vivo, although the area of discoloration was limited, the influence of the dark background of the oral cavity behind the tooth (which is a translucent object) and the pink color of the gingiva in the vicinity of the cervical area of the tooth of interest could not be overlooked. Hence, in order to avoid such interactions in the current investigation, extracted teeth were mounted in TiO2 incorporated acrylic resins to equalize the environmental contrast in all samples.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Tooth Color Change After Bleaching With Conventional and Different Light-Activated Methods

et al. 2017

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Introduction:The demand for esthetic dental treatments is increasing in recent years mainly due to improved oral hygiene and better maintenance of oral health and teeth in older individuals. Bleaching of discolored anterior teeth is the most popular among esthetic dental treatments. Even individuals with sound teeth and adequate esthetics seek to have whiter teeth in the anterior region. The aim of this study was to evaluate tooth color changes following conventional in-office bleaching techniques compared to light-activated methods using different light sources. Methods: Seventy sound anterior teeth (devoided of caries and/or fracture), extracted for periodontal and orthodontic reasons were selected and allocated to 7 groups: (A) control, (B) conventional bleaching (C) LED-activated bleaching, (D) KTP laser-activated bleaching, (E) diode laseractivated bleaching, (F) Nd:YAG laser-activated bleaching and (G) CO2 laser-activated bleaching. Colorimetric evaluation was carried out before and after treatment using a spectrophotoradiometer. Data were analyzed by one-and two-way analysis of variance (ANOVA) as well as multiple comparison methods. Results:The results showed that all bleaching procedures were effective in reducing the yellowness index. However, the KTP laser-activated bleaching was significantly more effective than the other techniques in 95% confidence level. It was also seen that CO2 laser activated method has outperformed groups E, F and G and the conventional bleaching without light activation was not effective at all and represented similar results with the control group. Furthermore, the groups E and G had almost the same results in decreasing the yellowness index. Conclusion:The results showed that all bleaching techniques were effective however, the KTP laser-activated bleaching was significantly more efficient, closely followed by the CO2 laseractivated bleaching technique.

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Section: Discussionmentioning

confidence: 99%

Comparison of Tooth Color Change After Bleaching With Conventional and Different Light-Activated Methods

et al. 2017

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“…Therefore, they are prone to significant edge-loss effects, which may lead to incorrect color measurements. 1,8,20 Alternatively, complete-tooth measurement does not cause edge loss; however, with this alternative method, it is difficult to control the measuring angle.…”

Section: Discussionmentioning

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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“…7 Certain limitations were present in the material analyzed, such as the need to have a flat surface with minimum extent and thickness as to allow color measurement. 4,24 Although some ligatures were evaluated because they had a polished surface, this surface was not flat. Moreover, the extent and thickness were not sufficient to yield a correct evaluation with these instruments.…”

Section: Tp Orthodontics and Morelli Values With Americanmentioning

confidence: 99%

Evaluation of the susceptibility to pigmentation of orthodontic esthetic elastomeric ligatures

Cavalcante¹,

Barbosa²,

Sobral³

2013

Dental Press J. Orthod.

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Objective: The purpose of this laboratory study was to evaluate changes in the pigmentation of esthetic elastomeric ligatures after immersion in a staining solution. Methods: Sixty ligatures were selected and divided into 12 groups according to their brand and also considering their condition, i.e., unstretched or stretched. The groups were divided into: Morelli (clear), TP Orthodontics (clear), American Orthodontics (clear), 3M/Unitek (clear), American Orthodontics (pearl color) and 3M/Unitek (pearl color), separated into groups of 5 unstretched and five stretched ligatures. Assessment of their color changes was performed by means of digital photograph and computer analysis using Adobe Photoshop. Standardized digital photographs were taken at T 0 (before the staining process, with unstretched ligatures) and at T 1 (following the 5-days staining process). The staining solution was composed of artificial saliva and foods with staining potential. At » The authors report no commercial, proprietary or financial interest in the products or companies described in this article.Objetivo: avaliar alterações da pigmentação de ligaduras elásticas estéticas após imersão em solução de pigmentação. Métodos: Sessenta ligaduras foram selecionadas e divididas em doze grupos de acordo com a marca comercial utilizada e nas condições normal e distendida. Os grupos foram divididos em: Morelli transparente, TP Orthodontics transparente, American Orthodontics transparente, Unitek/3M transparente, American Orthodontics pérola e Unitek/3M pérola, separados quanto à condição normal e distendida, totalizando 5 ligaduras em cada condição. A avaliação das mudanças de coloração foi realizada por meio de fotografia digital e análise computadorizada usando o programa Adobe Photoshop. Foram realizadas fotografias digitais padronizadas nos tempos T 0 -antes do processo de pigmentação, com as ligaduras em estado normal; e T 1 -após o processo de pigmentação, que durou cinco dias. A solução de pigmentação utilizada foi composta por saliva artificial e por alimentos que possuem potencial de coloração. No tempo T 1 , as ligaduras se encontravam em estado distendido e em estado normal (sem distensão). Resultado: os resultados do presente estudo demonstraram que ligaduras elásticas estéticas são suscetíveis à pigmentação. Dentre as marcas comerciais avaliadas a TP Orthodontics e American Orthodontics transparente foram as mais estáveis. Já a Unitek/3M pérola demonstrou alterações estatisticamente significativas em todas as variáveis avaliadas. Conclusão: ligaduras elásticas estéticas são suscetíveis à pigmentação, não havendo diferença estatisticamente significativa entre o estado normal e o estado distendido, com exceção na marca TP Orthodontics. A marca Unitek/3M pérola demonstrou ser a que apresenta maior potencial para pigmentação.Palavras-chave: Estética. Pigmentação. Fotografia. Ligadura.

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Influence of window size in small-window colour measurement, particularly of teeth

Cited by 195 publications

References 3 publications

Comparison of Tooth Color Change After Bleaching With Conventional and Different Light-Activated Methods

Comparison of Tooth Color Change After Bleaching With Conventional and Different Light-Activated Methods

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

Evaluation of the susceptibility to pigmentation of orthodontic esthetic elastomeric ligatures

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