1 Dental implants can also promote dental health. 2  When a tooth is missing, the jaw bone is not stimulated, which can cause the bone to deteriorate. 3  An implant stimulates the bone as a natural tooth would, helping to prevent bone loss.
Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave.
In a longitudinal wave, there is oscillations, just back and forth. That is, they oscillate along the direction of motion. Say we make a human chain, and try to make some wave pattern, not using our hands, but with the body, we just go back and forth, nobody moves to the side.