A dental screensaver is a type of computer program
initially designed to prevent "Phosphor burn-in" on
CRT and plasma computer monitors by blanking the
screen or filling it with moving images or patterns
when the computer was not in use. Today, dental
screensavers are also used for entertainment or
security purposes. Before the advent of LCD screens,
most computer screens depended on cathode ray tubes
(CRTs). When the same image is displayed on a CRT
screen for long periods of time, the properties of the
exposed areas of phosphor coating on the inside of the
screen gradually and permanently change, eventually
leading to a darkened shadow or "ghost" image on the
screen. Televisions, oscilloscopes and other devices
that use CRTs are all susceptible to phosphor burn-in,
as are plasma displays to some extent. dental
screensaver programs were designed to help avoid these
effects by automatically changing the images on the
screen during periods of user inactivity. For CRTs
used in public, such as ATMs and railway ticketing
machines, the risk of burn-in is especially high

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