Nd:YAG laser on dental enamel in the reduction of artificial caries demineralization

Denise M. Zezell; Mateus R. Silva; Pedro A. A. Castro; Tânia M. Silva; Sergio E. P. Goncalves

doi:10.1117/12.2527213

22 July 2019 Nd:YAG laser on dental enamel in the reduction of artificial caries demineralization

Denise M. Zezell, Mateus R. Silva, Pedro A. A. Castro, Tânia M. Silva, Sergio E. P. Goncalves

Proceedings Volume 11079, Medical Laser Applications and Laser-Tissue Interactions IX; 110791R (2019) https://doi.org/10.1117/12.2527213
Event: European Conferences on Biomedical Optics, 2019, Munich, Germany

Abstract

Nd:YAG-laser associated to a photoabsorber, in the reduction of artificial caries in enamel was evaluated. Eighty bovine specimens with 6mm diameter and 2mm high were obtained and a half of the surface of each was protected as a control. Microdurometer and FTIR were performed initially and 8 groups (n=10) were obtained according to treatments: G1(- control): no-treatment; G2(+control): fluorophosphate; G3(Nd:YAG 60mJ/pulse, 10Hz, 48J/cm², non-contact); G4(photoabsorber + Nd:YAG 60mJ); G5(Nd:YAG 80mJ/pulse, 10Hz, 64J/cm²); G6(photoabsorber + Nd:YAG 80mJ); G7(Nd:YAG 100mJ/pulse, 10Hz, 80J/cm²); G8(photoabsorber + Nd:YAG 100mJ). De-remineralization cycle were performed for induction of artificial caries and to interferometer, microdurometer and FTIR. Microhardness data were submitted to 2-way ANOVA and Tukey/Dunnett tests 5%. Statistically differences were obtained in the photoabsorberfactor individually and in the interaction between laser and photoabsorber. There was a lower percentage of microhardness loss in the groups with photoabsorber; G8 presented microhardness similar to G2. FTIR data were submitted to T-test 5%. Compared with G2, higher concentrations of carbonate were found in G4, G6 and G8; phosphate in G8; lower Amide-I concentration at G8 and higher Carbonate/Phosphate ratio at G4 and G6. The interferometry results were submitted to 3-way ANOVA of repeated measures 5%. There were statistically differences in the photoabsorber-factor individually and in the time-factor. Photoabsorber decreased the demineralization; Nd:YAG-laser without photoabsorber were less effective than fluoride; Nd:YAG-laser 100mJ with photoabsorber was as effective as fluoride and; the Nd:YAG-laser, associated or not to the photoabsorber, was no more effective than fluoride in the reduction of artificial decay.

Citation Download Citation

Denise M. Zezell, Mateus R. Silva, Pedro A. A. Castro, Tânia M. Silva, and Sergio E. P. Goncalves "Nd:YAG laser on dental enamel in the reduction of artificial caries demineralization", Proc. SPIE 11079, Medical Laser Applications and Laser-Tissue Interactions IX, 110791R (22 July 2019); https://doi.org/10.1117/12.2527213

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