13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 54

TITLE: Microhardness of dentin reminiscent after different methods of caries removal.

AUTHORS: Palma-Dibb RG, Contente M, Geraldo-Martins V, Faraoni-Romano JJ.

Depto. Odontologia Restauradora, Faculdade de Odontologia de Ribeirão Preto- USP; Universidade de Uberaba (UNIUBE)

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S202.

* doi:10.4317/medoral.17643702

http://dx.doi.org/10.4317/medoral.17643702

Abstract

The aim was to evaluate the microhardness of dentin reminiscent after root caries removal employing different methods. Sixty root dentin slabs (5x5x3 mm) were obtained from human teeth. Specimens were covered with nail varnish except for an area of 9mm² in the center of surface. Subsequently, root caries was induced using a microbiological model, except for the control group (sound). The specimens were randomly assigned to 6 groups (n=12), according to the process of root caries removal: G1-bur, G2–excavator; G3, G4 and G5 with Er,Cr:YSGG laser (λ=2.78 µm; 20Hz; 600µm) using power-2.25W; 2.50W and 2.75W, respectively; and G6–control with bur. Specimens were bisected in half, fixed in a matrix with their subsurfaces faced-up, and polished. The microhardness test (HK) was performed at 6 depths (20-200 µm) and in 2 regions (one in the borders of the cavity preparation (t), and one in the control area (c). Data were analyzed by one-way ANOVA and Wilcoxon test (α=0.05). No significant difference was found for hardness among the methods of caries removal. When each group was analysed individually, it was noted that G2 showed similar hardness between treated (26.3HK) and control area (26.51HK). Other methods have changed significantly the hardness. G5 presented a significant increase in the proper-ty (t=27.58HK; c=24.61). It can be concluded that all methods were similar to remove the affected dentin, and the 2.75W laser promoted a increase in the hardness. Fapesp (2008/07403-5).