Assessment of tooth bleaching efficacy with spectrophotometer / 华西口腔医学杂志
West China Journal of Stomatology
; (6): 259-262, 2014.
Article
de Zh
| WPRIM
| ID: wpr-231872
Bibliothèque responsable:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To analyze the changes in CIE L*, a*, and b* at cervical, body, and incisal sites after tooth bleaching by using a spectrophotometer.</p><p><b>METHODS</b>Sixty-seven intact and healthy maxillary central incisors were in-vestigated. These incisors were darker than A3 according to the Vita Classical shade guide. The CIE tooth shade parameters L*, a*, and b* were simultaneously recorded at three tooth areas (cervical, body, and incisal) with a spectrophotometer before and after tooth bleaching (35%H2O2 coordinating with Beyond whitening accelerator irradiating). The shade dif-ferential (DeltaE) was calculated. ANOVA, paired t-test, and Pearson correlation analysis were used for data analysis.</p><p><b>RESULTS</b>The efficacy rates of tooth bleaching were satisfactory, with 86.6%, 86.6%, and 85.1% in the cervical, body, and incisal sites, respectively. The average values of DeltaE were 5.09, 4.44, and 4.40 in the cervical, body, and incisal sites. Tooth bleaching significantly increased L* and significantly decreased a* and b* in all tooth areas (P < 0.01). The decreasing range of Deltab* was more than the increasing range of DeltaL* at the cervical site; opposite results were observed at the incisal site. A positive correlation was detected between baseline b* and DeltaE.</p><p><b>CONCLUSION</b>The spectrophotometer could objectively evaluate the whitening effect of tooth bleaching at the different tooth sites. The tooth bleaching system (35%H202 coordinating with Beyond whitening accelerator irradiating) exerts powerful bleaching actions in most of the tooth areas investigated. The order of tooth bleaching effectiveness is cervicalbody>incisal. Yellow coloration is decreased mainly at the cervical site, and brightness was increased mostly at theincisal site. The effectiveness of tooth bleaching increases as the baseline b* value increases.</p>
Texte intégral:
1
Indice:
WPRIM
Sujet Principal:
Spectrophotométrie
/
Blanchiment dentaire
/
Peroxyde d'hydrogène
/
Incisive
/
Molaire
Limites du sujet:
Humans
langue:
Zh
Texte intégral:
West China Journal of Stomatology
Année:
2014
Type:
Article