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How much of an old filling needs covering?
If an existing filling is still functional but the tooth’s appearance is bothering someone, what findings tend to make direct bonding a reasonable repair rather than a veneer? I’d be interested in how the filling’s size and position, the amount of healthy enamel left, and bite forces affect that recommendation and the chance of needing repairs.
Are there cases where a smaller bonded repair, or another conservative option, can improve the appearance without covering more healthy tooth? I know the answer depends on an exam, but I’m curious what dentists weigh when comparing the options.
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3 replies
The enamel at the edges matters for a small bonded repair: bonding tends to be more predictable when there’s sound enamel around the area to attach to. If the filling is confined to one accessible spot, that may leave room to repair just that defect. If it spans several visible surfaces, a veneer might cover more of what’s bothering someone, but it also means treating more of the tooth.
If the discoloration is confined to the filling and the surrounding tooth is sound, replacing just the visible composite may be a more conservative cosmetic option than covering more of the tooth. If the color change extends into the tooth, that might not solve it, so the dentist would need to assess where the discoloration actually is.
The amount of tooth left to support a repair matters too: a large filling can leave too little solid tooth for a small bonded patch to hold up well. Heavy biting or grinding can also make chipping more likely. If either is a concern, the dentist may weigh a restoration that covers more of the tooth for added protection, even though it’s less conservative.