When you’re sitting in the dentist’s chair, the last thing you expect is to hear the word quadrant. When the dental staff use this term, they’re not talking about equations or formulas. It’s an expression about the parts of your mouth.
Dentists split the interior of your mouth into four sections or quadrants. The upper portions of your mouth are the first two quadrants, while the lower portions are the third and fourth ones. So, the top right of your mouth’s interior is quadrant one (that’s your right side), while your top left is quadrant two.
The bottom is a bit more confusing. Whereas the upper part numbers the right side first, it’s the opposite for the bottom. The bottom left is quadrant three, and the bottom right is quadrant four. From the dentist’s perspective, they look into your mouth up and down. It’s easiest to list the quadrants such that the section under quadrant two is quadrant three.
You can imagine it this way. The dentist is reading your quadrants like a clock starting from the dentist’s top-left (quadrant 1) and going clockwise through quadrants 2, 3, and 4.
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