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.
Sometimes, the wave medium oscillates parallel to the wave's direction. In these cases, the wave is called a longitudinal wave. Longitudinal waves are a bit challenging to imagine, so let's use a slinky for reference. Imagine a long slinky is stretched out across a tabletop, with one end fixed.