Abstract
AIM: This study evaluated saliva effects on enamel morphology surface after microabrasion technique. METHODS: Enamel blocks (16 mm2) obtained from bovine incisors were divided into 9 groups as follows: one control group (no treatment), four groups with microabrasion treatment using 35% phosphoric acid and pumice (H3PO4+Pum) and other four groups treated with 6.6% hydrochloric acid and silica (HCl+Sil). One group of each treatment was submitted to 4 frames of saliva exposure: without exposure, 1-h exposure, 24-h exposure, and 7-days exposure on in situ regimen. Nineteen volunteers (n=19), considered as statistical blocks, used an intraoral appliance containing the specimens, for 7 days. Enamel roughness (Ra) was tested before and after treatment, and after saliva exposure. Confocal laser scanning microscopy (CLSM) was used to evaluate qualitatively the enamel morphology. RESULTS: All groups exhibited increased Ra after microabrasion. With regards to saliva exposure, the treatment with HCl+Sil presented more susceptibility to the saliva action, but no period of time was efficient in re-establishing this characteristic compared with the control group. CLSM analysis showed reduction of the micro-abrasive damages during the experimental times. CONCLUSIONS: Seven days of saliva exposure were not sufficient for the treated enamel to reach its normal characteristics compared with the control group.
Highlights
Received for publication: May 21, 2014 Accepted: August 07, 2014Correspondence to: Débora Alves Nunes Leite Lima Departamento de Odontologia Restauradora Universidade Estadual de Campinas – Unicamp Faculdade de Odontologia de Piracicaba Avenida Limeira 901 – Caixa Postal 52 CEP: 13414-903, Piracicaba, SP, BrasilThe microabrasion technique is a treatment to achieve dental esthetics in cases of superficial tooth stains and enamel decalcification and defects, improving color and surface texture of the tooth[1,2]
Only the group treated with H3PO4+Pum and 1-h exposure showed no decrease in enamel roughness, with statistically significant difference compared with the Ra analysis after microabrasion
With regard to the groups treated with hydrochloric acid and silica (HCl+Sil), all exposure periods to saliva (1 h, 24 h and 7 days) resulted in decreased enamel roughness compared with the group without saliva exposure
Summary
The microabrasion technique is a treatment to achieve dental esthetics in cases of superficial tooth stains and enamel decalcification and defects, improving color and surface texture of the tooth[1,2]. It is considered a safe and conservative technique, since it causes a non-significant loss of enamel, and it provides lasting and satisfactory results in a short clinical time[1,3,4]. The application of the microabrasive system is commonly followed by enamel polishing with diamond paste[6,7] or fluoridated paste[2,4]. Little is known about the effects of the microabrasive systems used on enamel surface, such as roughness and microhardness[6,7] and its behavior in the oral
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