A comparison of new and conventional methods for quantification of tooth color

Burgt, T.P. van der; Bosch, J.J. ten; Borsboom, P. C. F.; Kortsmit, W.J.P.M.

doi:10.1016/0022-3913(90)90099-x

Cited by 269 publications

(215 citation statements)

References 7 publications

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“…When this dispersion occurs, the energy is reflected diffusely, returning randomly from the specimen surface, commonly beyond the observation range of the spectrophotometer. Similar to the visual observation method, loss of the luminous energy happens as a result of limitations of the spectrophotometric observation window that was described earlier 11 in a study accomplished with natural teeth. This limitation was called edge loss.…”

Section: Discussionmentioning

confidence: 99%

Chromatic Influence of Value Resin Composites

Schmeling¹,

Meyer-Filho²,

Andrada³

2010

Operative Dentistry

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SUMMARYThe current study evaluated the chromatic influence of high, medium and low value composites on a dentin composite substrate (A2 shade) using spectrophotometric analysis. The specimens were divided into the following four groups: a) control (CG), entirely composed of dentin composite (n=5); b) high value (GHV), dentin composite and high value composite (n=20); c) medium value (GMV), dentin composite and medium value composite (n=20) and d) low value (GLV), dentin composite and low value composite (n=20). The dentin composite was 2.0 mm thick and the value composite was added in four different thicknesses, dividing the groups into four subgroups: S1 = 1.0 mm, S2 = 0.8 mm, S3 = 0.6 mm and S4 = 0.4 mm. The results were determined using the CIELAB system and differences in brightness of the specimens were analyzed using two-way ANOVA. Significant differences were found between different value resin composites, thicknesses and interactions, as revealed by the Tukey's test (HSD). Adding value composite produced lower brightness, and a gray shade was observed, compared to the control, regardless of the value or thickness of the primary composite. Eleven of the 12 subgroups presented clinically unacceptable chromatic changes, except when the 0.4 mm thickness of high value composite was used.

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Section: Discussionmentioning

confidence: 99%

Chromatic Influence of Value Resin Composites

Schmeling¹,

Meyer-Filho²,

Andrada³

2010

Operative Dentistry

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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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“…11,[13][14][15][16][17][18][19][20][21] The purpose of this study was to measure the repeatability of three commercially available CMDs under clinical conditions using one trained operator.…”

Section: Introductionmentioning

confidence: 99%