Repositorio
Institucional

Koumpia, Effimia

Eliades, Theodore

Knoesel, Michael

Athanasiou, Athanasios E.

Colour assessment of bleaching effect on orthodontically treated teeth

OXFORD UNIV PRESS

EUROPEAN JOURNAL OF ORTHODONTICS

en

Aim To assess whether the efficacy of external tooth bleaching differs between untreated and orthodontically treated teeth. Materials and method Three groups of subjects were formed, group Debonded included 24 consecutive orthodontically treated patients evaluated immediately after removal of fixed appliances. The Retention group included 24 consecutive orthodontically treated patients in the phase of retention. The Untreated group consisted of 24 arbitrarily selected undergraduate dental students without history of fixed-appliances orthodontic therapy. Each of the above three groups was further randomized into two subgroups, Bleaching and Placebo. Each subgroup received either a 38% hydrogen peroxide bleaching treatment or a placebo agent, respectively. Tooth colour changes were assessed at seven timepoints: 1 day before intervention, on the day of intervention before and after treatment, and at 7, 14, 21, and 90 days for parameters L*, a*, b*, and Delta Epsilon in all upper incisors and canines with the use of a reflectance spectrophotometer. Intra-rater agreement was estimated with the Intra-class Correlation Coefficient and method's error was calculated using the Repeatability Coefficient. Regarding tooth colour changes, an analysis of variance was used to assess differences between groups. Results Bleaching was associated with an increase of the L* value and decrease of b* and a* values in both orthodontically treated and untreated teeth. Parameters Delta E, L*, and b* exhibited statistically significant differences between the Bleaching-Untreated and Bleaching-Retention subgroups. In the Bleaching subgroups, statistically significant differences were found between different teeth for all parameters. Conclusions Previous exposure to fixed orthodontic appliance influenced the efficacy of external tooth bleaching. The effect of bleaching was higher after orthodontic treatment and with longer period in retention. Canines changed in colour more than incisors, and the effect was reduced over time.

artículo original

10.1093/ejo/cjac006

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DIFFERENT DEBONDING TECHNIQUES

ENAMEL COLOR

TOOTH COLOR

CARBAMIDE PEROXIDE

CLEANUP PROCEDURES

IN-VITRO

DISCOLORATION

ADHESIVES

REMOVAL

SATISFACTION

Odontología

Cirugía Bucal y Medicina

DIFERENTES TÉCNICAS DE DESPEGADO

COLOR DE ESMALTE

COLOR DE DIENTES

PERÓXIDO DE CARBAMIDA

PROCEDIMIENTOS DE LIMPIEZA

IN VITRO

DECOLORACIÓN

ADHESIVOS

ELIMINACIÓN

SATISFACCIÓN

Odontología, Cirugía y Medicina Oral

Otros Temas de Medicina Clínica

Tecnología Médica

Colour assessment of bleaching effect on orthodontically treated teeth

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WOS:000768459800001