L.S.M. FRAGOSO

Universidade Federal de Alagoas, Maçayó, Alagoas, Brazil

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Publications (2)2.92 Total impact

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    ABSTRACT: Objective: To evaluate the effect of microabrasion on microhardness and roughness of bovine enamel and the action of polishing carried out with the appropriate pastes on abrasioned enamel, evaluate the effect of storage in artificial saliva, during different times of action, on the microhardness of bovine dental enamel. Method: 144 bovine enamel blocks, forming the groups: I-treatment with 37% phosphoric acid and pumice paste, II-treatment with Opalustre (Ultradent), III-treatment with Whiteness RM (FGM). The three groups were divided into three subgroups, according to the following treatments: a) diamond polishing paste, b) polishing with fluoride prophylactic paste and c) without polishing (control). Tests of hardness were carried out in the following set times: 1) initial (prior to the microabrasion and polishing), 2) after microabrasion with and without polishing (control), 3) after microabrasion with and without polishing and immersion in artificial saliva for 24 hours; 4) after microabrasion with and without polishing and immersion in artificial saliva for 7 days. Tests of surface roughness were performed in the following pre-set times: 1) initial (prior to the microabrasion and polishing) and final (after the completion of microabrasion with and without polishing) (control). Result: Microabrasion followed by polishing provided an increase of superficial microhardness; without the use of polishing, only the microabrasive systems with hydrochloric acid and silicon carbide showed increased superficial microhardness; different times of storage in artificial saliva did not result in increased microhardness; the products used for microabrasion did not provide surface roughness different from each other; all microabrasive systems followed by polishing showed a higher surface smoothness compared with the groups without polishing. Conclusion: Microabrasion followed by polishing provided higher hardness and better surface smoothness of the dental enamel. However, the immersion in artificial saliva for 24 hours and 7 days was not able to increase the enamel hardness.
    IADR General Session 2012; 06/2012
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    ABSTRACT: This study evaluated the effect of microabrasion and polishing on the microhardness and roughness of bovine enamel, and the effect of artificial saliva on the hardness of enamel. Bovine enamel blocks were used, forming the groups (n = 48): GI-37% phosphoric acid and pumice, GII--Opalustre, and GIII--Whiteness RM. The groups were divided into different subgroups: (a) diamond paste, (b) fluoride prophylactic paste, and (c) without polishing. Hardness tests were carried out at the following set times: (T1) initial, (T2) after microabrasion and polishing, (T3) after immersion in artificial saliva for 24 h; and (T4) after seven days of immersion. Surface roughness tests were performed. The obtained data were analyzed by two-factor ANOVA and Tukey's test with significance of 5%. Microhardness increased in T2; without polishing, only groups GII and GIII showed an increased microhardness. T3 did not differ from T4; GI, GII and GIII did not provide surface roughness that differed from each other; and all microabrasive systems followed by polishing showed a higher surface smoothness compared with the control groups. It is concluded that microabrasion followed by polishing provided higher hardness and better surface smoothness of the enamel. However, immersion in artificial saliva was not able to increase the enamel hardness.
    Biomedical Materials 04/2011; 6(3):035001. · 2.92 Impact Factor

Publication Stats

2 Citations
2.92 Total Impact Points

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Institutions

  • 2012
    • Universidade Federal de Alagoas
      Maçayó, Alagoas, Brazil
  • 2011
    • University of Campinas
      • Faculty of Dentistry from Piracicaba
      Conceição de Campinas, São Paulo, Brazil