Inlays are better restorations than composites. They do reuire more work and a lab cost so they are generally more expensive as well. Regarding your question about a cavity occurring so quickly, I am not sure how long it was between the time you got the 2 fillings, but cavities can form within a few months in rare cases, but what oftentimes happens is that they are present, but don't show up on x-rays until they become a little larger. Also, you asked why the dentist said it was larger once he removed the fillings if I understood correctly. Any time a filling is removed, the hole that's left becomes slightly larger because of the shaving of the walls. However, a composite or filling may be placed in either case. Hope this helps.
Vatan Dental Group
310-676-2922
Omid Vatan, DDS
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