Influence of Ultrapulsed CO₂ Laser, before Application of Different Types of Fluoride, on the Increase of Microhardness of Enamel In Vitro

Figure 2

Evaluation of microhardness of bovine tooth enamel before and after enamel caries lesion induction and after the first, third, and fifth weeks. Different letters mean statistically significant different times. Different symbols mean statistically significant different treatments. Mean values (n=10) of surface microhardness of the tooth enamel according moment of analysis and treatment. Distinct letters (a, b) indicate statistical difference among the times of analysis. Different symbols (# ) indicate statistical difference among the treatments. Vertical bars indicate standard error of the mean (Bonferroni test, p<0.05).