IADR Abstract Archives

Dentin erosion resistence: effect of Nd:YAG irradiation and fluoride application

Objective: The morphological changes on dentine induced by laser treatment might reduce the progression of the erosive lesion. Due to the possibility of a synergistic effect between laser and fluoride, the aim of this study was to evaluate the effect of two fluoridated agents and Nd:YAG irradiation separately and in combination on dentin resistance to erosion.

Methods: Eighty bovine dentin samples (4 x 4 mm) were randomly divided into 8 groups, according to the following treatments: G1- untreated (control); G2- Acidic Phosphate Fluoride gel (APF-1.23%F) for 4 min; G3- fluoride varnish (NaF-2.26%F) for 6 h; G4- 0.5 W Nd:YAG laser (250 µm pulsewidth, 10 Hz, 35 J/cm2); G5- 0.75 W Nd:YAG laser (52.5 J/cm2); G6- 1.0 W Nd:YAG laser (70 J/cm2); G7- APF + 0.75 W Nd:YAG laser; G8- Varnish + 0.75 W Nd:YAG laser. After the treatments, half of each dentin surface was protected with nail varnish. The samples were stored in artificial saliva (30 mL/sample) for 24 h and submitted to 4 erosive cycles (Sprite light®, 30 mL/sample, 1 min). Between the erosive attacks, the blocks were maintained in artificial saliva for 59 min. The erosive wear was evaluated by profilometry.

Results: The mean wear (±SD, μm) was: G1-1.20±0.20A,E; G2-0.47±0.06B; G3-0.81±0.11C; G4-1.47±0.32A; G5-1.52±0.24D; G6-1.49±0.30A; G7-0.49±0.11B and G8-1.06±0.31C,E (ANOVA and Tukey's test, p<0.05).

Conclusions: The laser irradiation was not able to reduce dentin erosion. However, fluoride application was able to increase the dentin resistance to erosion, and APF showed better results when compared to F varnish.


IADR/CADR General Session
2008 IADR/CADR General Session (Toronto, Ontario, Canada)
Toronto, Ontario, Canada
2008
2501
Cariology Research
  • Machado, Maria Aparecida  ( University of Sao Paulo, Bauru-Sao Paulo, N/A, Brazil )
  • Magalhães, Ana Carolina  ( Universidade Est. Paulista Julio Mesquita, Araçatuba, N/A, Brazil )
  • Rios, Daniela  ( University of São Paulo, Bauru, N/A, Brazil )
  • Silva, Salete  ( University of Sao Paulo-Bauru, Bauru, SP, N/A, Brazil )
  • Lizarelli, Rosane De Fatima Zanirato  ( University of Sao Paulo, São Carlos, N/A, Brazil )
  • Bagnato, Vanderlei Salvador  ( São Paulo University, São Carlos, N/A, Brazil )
  • Buzalaf, Marilia Afonso Rabelo  ( University of Sao Paulo, Bauru-SP, N/A, Brazil )
    • Poster Session
    Saliva/Erosion
    07/04/2008