Enamel properties after tooth bleaching with hydrogen/carbamide peroxides in association with a CPP-ACP paste.
BACKGROUND
This study evaluated the impact of bleaching teeth using blends of a CPP-ACP paste (MI Paste; MI) and carbamide/hydrogen peroxides in different proportions on surface properties of bleached enamel.


METHODS
Ninety bovine incisors were bleached with 7.5% hydrogen peroxide (HP), 16% carbamide peroxide (CP), MI and blends of HP or CP:MI at three proportions (1:1, 2:1, 1:2). Hardness and roughness were measured at baseline and after bleaching. Enamel morphology was evaluated by Scanning Electron Microscopy (SEM). The data were analyzed by two-way ANOVA for repeated measurements and Tukey's test.


RESULTS
Most of the samples bleached with MI in combination with peroxides presented increased hardness and roughness which were associated to mineral deposition, as observed by SEM images. Blends with higher fractions of MI did not offer superior benefits.


CONCLUSIONS
The use of a CPP-ACP paste mixed to carbamide/hydrogen peroxides can decrease adverse side-effects from tooth bleaching on an enamel surface.
School of Dentistry, Potiguar University (Laureate International Universities), Natal, Brazil.
Adriana Alcantara Meira
AA
de Vasconcelos
Ana Gabriela Gama
AG
Cunha
Boniek Castillo Dutra
BC
Borges
Jussier de Oliveira
Jde O
Vitoriano
Clodomiro
C
Alves-Júnior
Cláudia Tavares
CT
Machado
Alex José Souza
AJ
dos Santos
D000704:Analysis of Variance; D000818:Animals; D000077463:Carbamide Peroxide; D002364:Caseins / Q000494:pharmacology*; D002417:Cattle; D003743:Dental Enamel / Q000187:drug effects* / Q000648:ultrastructure; D003802:Dentifrices / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D006244:Hardness / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000008:administration & dosage / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D010545:Peroxides / Q000008:administration & dosage / Q000494:pharmacology; D013499:Surface Properties / Q000187:drug effects; D013662:Tea / Q000009:adverse effects; D014073:Tooth Bleaching / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000008:administration & dosage / Q000494:pharmacology*; D014075:Tooth Discoloration / Q000209:etiology; D014508:Urea / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000494:pharmacology
D002364:Caseins; D003802:Dentifrices; D004338:Drug Combinations; D010545:Peroxides; D013662:Tea; D058205:Tooth Bleaching Agents; C447032:casein phosphopeptide-amorphous calcium phosphate nanocomplex; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide