Micromorphology and microhardness of enamel after treatment with home-use bleaching agents containing 10 percent carbamide peroxide and 7.5 percent hydrogen peroxide
J. appl. oral sci
;
17(6): 611-616, Nov.-Dec. 2009. ilus, tab
Article
Dans Anglais
| LILACS
| ID: lil-534429
ABSTRACT
OBJECTIVE:
The purpose of this study was to assess the effect of home-use bleaching agents containing 10 percent carbamide peroxide and 7.5 percent hydrogen peroxide on enamel microhardness and surface micromorphology. MATERIAL ANDMETHODS:
Enamel slabs (n=10) received the bleaching agents for 1 h/day and remained in artificial saliva solution for 23 h/day, during a total period of 21 days. Control group was composed of enamel slabs that were not subjected to treatment with the agents and were maintained in artificial saliva solution. Microhardness tests were performed before treatment application, 21 days of treatment and 14 days after the end of treatment. Scanning electron microscopy analyses were performed after 14 days after the end of bleaching treatment by 3 calibrated observers who attributed scores.RESULTS:
The Tukey's test (á=0.05) showed no significant differences in microhardness values among bleaching agents, at 21 days of treatment and a significant increase in microhardness for different agents after 14 days from the end of treatment. Fisher's exact test showed differences in micromorphology of enamel between control and experimental groups (p=0.0342).CONCLUSIONS:
Bleaching agents containing 10 percent carbamide peroxide and 7.5 percent hydrogen peroxide may change surface micromorphology of enamel, although no changes in microhardness were observed.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Peroxydes
/
Blanchiment dentaire
/
Urée
/
Oxydants
/
Émail dentaire
/
Peroxyde d'hydrogène
Type d'étude:
Essai clinique contrôlé
/
Étude observationnelle
/
Étude pronostique
/
Facteurs de risque
Limites du sujet:
Humains
langue:
Anglais
Texte intégral:
J. appl. oral sci
Thème du journal:
Dentisterie
Année:
2009
Type:
Article
/
descriptif de projet
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
School of Dentistry and Dental Research Center São Leopoldo Mandic/BR
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