Periodontal treatment is the specialist cleaning of your teeth and gums to help control the bacteria that cause gum disease. Gum disease is caused by the germs (bacteria) which live in your mouth. The bacteria stick to your teeth, irritate the gums and make them bleed.
(Redirected from Ground effect in aircraft) In fixed-wing aircraft, ground effect is the increased lift (force) and decreased aerodynamic drag that an aircraft's wings generate when they are close to a fixed surface. When landing, ground effect can give the pilot the feeling that the aircraft is floating.
Floor Effect. In research a floor effect (aka, Basement Effect) is when measurements of the dependent variable (the variable exposed to the independent variable and then measured) result in very low scores on the measurement scale. This could be hiding a possible effect of the independent variable (the variable being manipulated). An example could be seen in a study being conducted by a school on the prevalence of academic dishonesty.