The different kind and operational modes of lasers irradiation have been compared to determine their effectiveness in inhibiting the formation of an in vitro incipient caries-like lesion.
It is clearly indicated from these experiments that the acousto-optically Q-switched Nd: YAG laser might prove to be the most effective for clinical application.
Laser irradiation was found not only to prevent but also cure incipient enamel caries without cutting lesions and restoring. This irradiation could also prevent the secondary caries at restoration margins with closing the space by fusion between the cavity margins and resinous restorations.
The Nd: YAG laser was effective for treating sensitive root surfaces by closure of dentinal tubule apertures, and also for endodontic treatment by promating additional secondary dentin formation on pulp chamber walls.
