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 is a fundamental underlying force in the universe. The amount of gravity that something possesses is proportional to its mass and distance between it and another object. This relationship was first published by Sir Issac Newton. His law of universal gravitation says that the force (F) of gravitational attraction between two objects with Mass1 and Mass2 at distance D is: F = G(mass1*mass2)/D squared. (G is the gravitational constant, which has the same value throughout our universe.). Einstein's theory of relativity adds to this.