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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). The acceleration of gravity is 980 cm/sec 2. The weight of a body is the force exerted by the earth on the body and this force accelerates the body at a rate of 980 cm/sec 2. Thus the gravitational force on a 1 gram object is a force of 980 dynes.