13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 76

TITLE: Demineralization analysis of deciduous tooth enamel after irradiation with LEDs and fluoride photoabsorbing cream using X-Ray dispersive energy.

AUTHORS: de Sant'Anna GR, de Almeida WR, Vasconcelos FF, dos Santos EAP, Brugnera Jr. A, Duarte DA, Martins AA, do Espírito-Santo AM.

Cruzeiro do Sul University; Vale do Paraíba University; Institute of Biomedical Engineering, LEVB ; Camilo Castelo Branco University

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S224.

* doi:10.4317/medoral.17643724

http://dx.doi.org/10.4317/medoral.17643724

Abstract

Dental caries is the most prevalent oral disease. A simple preventive noninvasive approach is the enamel treatment with laser alone or with fluoride, resulting in rates of low solubility and dissolution. Our aim was to investigate changes in enamel composition after LED associated with photoabsorbing cream treatment and cariogenic challenge using µ-EDX.

Samples of caries-free primary teeth (n = 32) divided into 4 groups: control (CTR), LED (λ = 470nm, 190mW/cm², 180 sec), cream fluoride (AOF), cream fluoride + LED (AOLF). The samples were submitted to initial analysis, treated according to the protocols and submitted to pH cycling cariogenic challenge (7 days), then resubmitted to EDX.

Reduction in Ca and P weight% was observed in LED group while AOFL maintained the Ca and P values post challenge. CTR and LED groups showed a difference between pre and post challenge in organic balance, with reduction and increase values, respectively. The AOFL had constant values, while CTR presented decreased. The Ca/P ratio was reduced in LED, AOF and AOFL, between moments, while there was significant reduction of inorganic/organic ratio for CTR and AOF showing increased loss of inorganic constituents in relation to organic. In this variable, AOFL presented the highest mean values before and after challenge. There were no differences post-challenge between treatment groups.

Sound enamel irradiated with LED only showed higher losses of inorganic components after cariogenic challenge.