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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However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which describes gravity as a force which causes any two bodies to be attracted to each other, with the force proportional to the product of their masses and inversely proportional to the square of the distance between them. Gravity is the weakest of the four fundamental forces of physics, approximately 10 38 times weaker than the strong force, 10 36 times weaker than the electromagnetic ...