A. A. There are two main types of dental X-rays: intraoral (meaning the X-ray film is inside the mouth) and extraoral (meaning the X-ray film is outside the mouth). 1  Intraoral X-rays are the most common type of dental X-ray taken.2  Extraoral X-rays show teeth, but their main focus is the jaw and skull.here are two main types of dental X-rays: intraoral (meaning the X-ray film is inside the mouth) and extraoral (meaning the X-ray film is outside the mouth). 1  Intraoral X-rays are the most common type of dental X-ray taken. 2  Extraoral X-rays show teeth, but their main focus is the jaw and skull.
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gravity. 1. the phenomenon by which two bodies having mass are attracted to each other. 2. the gravitational attraction near a large body having mass, particularly near or on the surface of a planet or star. specific gravity see specific gravity. standard gravity (â¬ g) the acceleration due to gravity at mean sea level, 9.80616 meters per second squared.