A periodontist is a dentist who specializes in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. Periodontists are also experts in the treatment of oral inflammation.
Ground speed. Ground speed is the horizontal speed of an aircraft relative to the ground. An aircraft heading vertically would have a ground speed of zero. Information displayed to passengers through the entertainment system often gives the aircraft ground speed rather than airspeed.
Major League Scouts consider 90 mph an average major league fast ball. 95 mph is considered a plus fastball velocity, and +97-98 mph a plus, plus velocity. the 90 range is a good speed for an mlb pitcher. some pitchers do pitch in the high 80s though.real good pitchers pitch 100mph too. Randy Johnson threw a 103 mph fastball.5 mph is considered a plus fastball velocity, and +97-98 mph a plus, plus velocity. the 90 range is a good speed for an mlb pitcher. some pitchers do pitch in the high 80s though.