Maternal periodontal disease is a chronic oral infection with local and systemic inflammatory responses and may be associated with adverse pregnancy outcomes including low infant birth weight (...

Vibration is occasionally \\\"desirable\\\". But, more often, vibration is undesirable, wasting energy and creating unwanted sound-noise. So, to use the desirable vibrations & to remove or to reduce undesirable vibrations, we need to study the vibrations....