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Two‐Year Clinical Evaluation of Tooth Whitening Using an At‐Home Bleaching System
Author(s) -
SWIFT EDWARD J.,
MAY KENNETH N.,
WILDER ALDRIDGE D.,
HEYMANN HARALD O.,
BAYNE STEPHEN C.
Publication year - 1999
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/j.1708-8240.1999.tb00374.x
Subject(s) - carbamide peroxide , dentistry , medicine , tooth whitening , significant difference , anterior teeth , enamel paint
Purpose : The purpose of this study was to evaluate the 2‐year effectiveness of a carbamide peroxide at‐home bleaching gel used to provide tooth lightening treatment. Material and Methods : Twenty‐nine patients participated in the original study, during which they treated their maxillary teeth with a 10% carbamide peroxide gel nightly for 2 weeks. Shades were determined before and after treatment by comparison with a Vita shade guide. Twenty‐four patients (a recall rate of 83%) were recalled for evaluation 2 years after the initial bleaching treatment. The shade of the maxillary incisors was evaluated and compared with shades before, immediately after, and at 6 months and 2 years after initial treatment. Data were analyzed using a repeated‐measures analysis of variance. Results : At 2 years after bleaching with a 10% carbamide peroxide gel, the median shade was D2, a six‐increment difference from the baseline median of D3. Twenty of 24 patients (83.3%) had a shade change of two or more units, which is the threshold value for bleaching efficacy using American Dental Association guidelines. The lightening result remained statistically significant ( p <.0001) at 2 years.