Abstract
Purpose: This study investigated the acid-resistance effect of CO2 laser irradiation and dental fluoride solution on dentin surfaces.
Methods: Cubic dentin specimens were cut or trimmed from extracted human molars and were divided into two groups for laser irradiation with and without applying fluoride solution. Each sample was subjected to 2 ml of pH standard solution (pH 4). The concentration of dissolved Ca2+ in each solution was determined by an atomic absorption spectrophotometer and the morphological changes of the dentin surface were investigated by a scanning electron microscope and surface roughness profilometer.
Results: After the soaking test, the concentration of dissolved Ca2+ was significantly lowered by CO2 laser irradiation, but the concentration was almost the same as that of the control with repeated soaking. Laser irradiation after applying fluoride solution significantly decreased the Ca+ concentration as compared to other conditions.
Conclusion: The results suggested that CO2 laser irradiation of dentin enhances its acid resistance, and that CO2 laser irradiation with dental fluoride solution is more effective.
