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FAQ: Fillings

Question:
When a tooth has 80 to 90 percent filling do you really ever see it as salvageable? I was told by one dentist it just doesn't pay to crown teeth like that. Most of mine have root canals.

I know they are worried when removing the crowns about breakage of what is left due to the weakness of the tooth. How do you save teeth? ...Visitor from WI

Answer:
The inside of the tooth can be built-up with a post, core and then be crowned, if there is at least 1.5 mm of natural tooth structure around the entire tooth at the bottom called the margin. It also requires at least 1.5 mm of tooth structure below the margin and the beginning of the attachment of the periodontal ligament (where the gums attach to the tooth). This is called the biological width.

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