INFLUENCE OF LASER Er,Cr:YSGG ASSOCIATED OR NOT WITH FLUORIDE VARNISH IN THE DENTIN ACID RESISTANCE AFTER EROSIVE CHALLENGE

• Palavras-chave: Dental erosion; Sodium Fluoride; YSGG laser; Preventive therapy

• Keywords: Dental erosion; Sodium Fluoride; YSGG laser; Preventive therapy

• Abstract:

  Dental erosion is characterized by an irreversible loss of enamel and dentin, induced by acids, intrinsic and/or extrinsic, without the action of microorganisms. Several treatments have been proposed to minimize this problem. Thus, the aim of this study was to evaluate the influence of Er,Cr:YSGG laser associated or not with 5% fluoride varnish on dentin acid resistance after erosive challenge. Twenty bovine incisors were selected and sectioned, obtaining 40 specimens of 4mm x 4mm and randomly divided into 8 groups (n=5). In G1: Er,Cr:YSGG laser application (0.1W; 5Hz; air 55%); G2: Er,Cr:YSGG laser irradiation (0.25W; 5Hz; air 55%); G3: fluoride varnish + Er,Cr:YSGG (0.1W; 5Hz; air 55%); G4: fluoride varnish + Er,Cr:YSGG (0.25W; 5Hz; air 55%); G5: fluoride varnish + Er,Cr:YSGG (0.1W; 5Hz; no air application); G6: fluoride varnish + Er,Cr:YSGG (0.25W; 5Hz; no air application); G7: application of fluoride varnish (positive control) and G8: no treatment (negative control). Each group was submitted to erosive challenge with immersion in Coca-Cola® for 1 minute, twice a day, for 5 days. The specimens were analyzed by confocal laser scanning microscopy, which evaluated the dentin wear profile (percentage of volume loss). For the wear profile, the Kruskal-Wallis test and the Dunn post-test were used. All these tests adopted a significance level of 5% (α=0.05). Regarding the percentage of lost volume, groups G5 and G6 had the best results (G5=8.2% and G6=9.7%), with the lowest loss of dentin volume compared to the other groups (p<0, 05). The G8 group (without treatment) had the greatest volume loss (G8=45.3%), followed by the G7 group (fluoride varnish), which presented 27.9%. It is concluded that the use of Er,Cr:YSGG laser associated with fluoride varnish increased the acid resistance of bovine dentin after erosive challenge.

• Número de páginas: 15