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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1 The force of gravity at work on the object is that object's weight, or its mass multiplied by the acceleration of gravity. 2  Example: Find the normal force of a block with a mass of 4.2 kg.