EFFECT OF ND:YAG LASER AND FLUORIDE TREATMENT ON THE PERMEABILITY OF PRIMARY TOOTH ENAMEL

• DOI: 10.22533/at.ed.29619010428

• Palavras-chave: Esmalte dentário; fluoretos; permeabilidade; Dente decíduo; Lasers.

• Keywords: Dental enamel; fluorides; permeability; Tooth, deciduous; Lasers.

• Abstract:

  The purpose of this study was to evaluate the effects of the combination

  of Nd:YAG laser treatment and a topical acidulated phosphate fluoride gel or a fluoride

  varnish on the permeability of primary enamel. Twenty-four human primary teeth

  were sectioned in the buccolingual direction, and the samples were isolated with nail

  varnish/wax, leaving an exposed area on the outer surface (9 mm2). These samples

  were randomly divided into 6 groups (n=8) according to the provided treatments, which

  included the following: G1 (no treatment), G2 (1.23% acidulated fluoride gel (DFL ®;

  4 min), G3 (acidulated fluoride gel + Nd:YAG at 0.5 W/10 Hz contact mode), G4 (5%

  fluoride varnish (Duraphat ®), G5 (fluoride varnish + Nd:YAG at 0.5 W/10 Hz) and G6

  (Nd:YAG at 0.5 W/10 Hz). After the treatment, a histochemical coloring method using

  copper sulfate and a dithiooxamide solution was performed on all of the samples. Three

  sections taken from the exposed area of each sample were imaged using an optical

  microscope. The permeability was measured in the resulting digitized images as the

  percentage of copper penetration across the enamel thickness. The data were analyzed

  using ANOVA and Fisher’s LSD. The control group had the deepest copper penetration

  (67.48%) and was significantly different (p<0.05) from G2(27.71%), G3(23.24%),

  G4(37.81%), G5(39.88%) and G6(36.80%), all of which were found to have a lesser

  degree of copper penetration. Nd:YAG laser treatment, either with/without fluoride gel/

  varnish, was found to be similar to topical fluoride application in terms of its effects in

  reducing enamel permeability.

• Número de páginas: 15