Evaluation of human enamel permeability exposed to bleaching agents
| Autor: | Osnara Maria Mongruel Gomes, Giovana Mongruel Gomes, Diego Horning, Alessandra Reis, Bruna Fortes Bittencourt, Lucas Manuel Ruiz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Saliva
Varnish Dentistry Bleaching agents Permeability chemistry.chemical_compound stomatognathic system Dentin medicine dental enamel Dental enamel Hydrogen peroxide General Dentistry Enamel paint business.industry bleaching agents RK1-715 Silver nitrate stomatognathic diseases medicine.anatomical_structure chemistry Permeability (electromagnetism) visual_art visual_art.visual_art_medium Dental Enamel Permeability permeability business |
| Zdroj: | Brazilian Journal of Oral Sciences, Volume: 12, Issue: 2, Pages: 114-118, Published: JUN 2013 Brazilian Journal of Oral Sciences v.12 n.2 2013 Brazilian journal of oral sciences Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP Brazilian Journal of Oral Sciences, Vol 12, Iss 2 (2015) |
| Popis: | AIM: To evaluate the human enamel permeability after different external bleaching techniques. METHODS: The coronal portions of 20 maxillary human incisors were covered with an acid resistant varnish, except the labial surface, to prevent dye penetration of silver nitrate. The specimens were divided randomly into four groups (n=5) according to the bleaching treatments: Group 1 (G1) - without bleaching agent (control group), Group 2 (G2) - 35% hydrogen peroxide (HP) - one session of three 10-min applications, Group 3 (G3) - 35% HP - 2 sessions of three 10-min applications, and Group 4 (G4) - 6% HP - 14 days (1h/day). G1 was exposed to artificial saliva only and in the other groups the bleaching agents were applied following the manufacturers' recommendations. After bleaching, teeth were immersed in a 50% silver nitrate solution for 2 h and photodeveloped for 16 h. Then, three longitudinal slices of each tooth were photographed by an optical microscope (100x). The degree of dye penetration was analyzed in the middle third of the dental crowns using a 0 to 4 score system (0= no dye penetration, 1= less than half the enamel thickness, 2= half of the enamel thickness, 3= full extent of enamel without reaching the dentin, and 4= tracer agent reaching dentin). The data were analyzed statistically by the Kruskal-Wallis and Dunn tests (α=0.05). RESULTS: The median (1st/3rd interquartiles) ranges were: G1: 0(0/0), G2: 2(2/3), G3: 3(3/3) and G4: 3(3/3). G2, G3 and G4 showed significantly higher dye penetration compared with G1 (p=0.0017). CONCLUSIONS: The use of bleaching agents increased dental enamel permeability, regardless of the bleaching technique. |
| Databáze: | OpenAIRE |
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