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As I understand it, having work done on a tooth (i.e., replacing a filling) weakens it and makes it more susceptible to crack. And some cracks don't show up on x-rays, only in pain during chewing. A crown is a reasonable alternative to losing the tooth, and those prices seem in line with what I went through last year.
One way they check is by having you bite down on a small rubber piece. Certain angles of pressure cause pain by stressing the crack, lending credence to the possibility of a crack. It is a bit of a gamble, and if the crown doesn't work you may have to pay for a crown AND an extraction, but the choice should ultimately be yours.
Babak
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