In Vitro Effect of Strontium-Doped 45S5 Bioglass and Nd:YAG Laser on Microhardness of Demineralized Enamel

Background and Objective: Dental health plays an important role in oral health and can significantly affect the general health and wellbeing of individuals. Carious teeth are often managed by dental restorations. However, preventive approaches such as fissure-sealant and fluoride therapy are gaining increasing popularity. This study aimed to assess the effect of strontium-doped 45S5 bioglass and Nd:YAG laser on microhardness of demineralized enamel .Materials and Methods: In this in vitro, experimental study, 65 sound enamel samples were prepared of human premolars and polished. They were then immersed in a demineralizing solution for 10 weeks. The samples were randomly divided into 5 groups of control, bioglass, laser, laser plus bioglass and bioglass plus laser. Two samples of each group underwent assessment of surface morphology under a scanning electron microscope (SEM). Microhardness of samples was then measured using a Vickers hardness tester .Finding :The mean microhardness of bioglass group was significantly higher than that of other groups (P<0.05). The lowest microhardness was noted in the control group. The difference in microhardness was significant between laser and laser plus bioglass groups (P<0.05). Also, the bioglass plus laser group had a significant difference in microhardness with bioglass and control groups (P<0.05). The difference between laser plus bioglass and control groups was also significant in this respect (P<0.05). Maximum morphological changes were noted in bioglass group .Conclusion: Bioglass seems to be effective for treatment of incipient enamel caries. It effectively increases the enamel microhardness and decreases the mineral loss while preserves the integrity of the enamel surface .

کلیدواژه ها:

Bioactive glass ، Laser ، Enamel ، Microhardness ، Caries