
How to Replace Old Dental Crowns and Veneers
Replacing an old crown or veneer means removing it, checking for decay and making a new one; a dark line at the gumline, chipping or movement signal it.
Clinical experience, misunderstood concepts and frequently asked questions. Notes from many years of practice.

Replacing an old crown or veneer means removing it, checking for decay and making a new one; a dark line at the gumline, chipping or movement signal it.

The ridge keeps shrinking under a denture: 20 human studies found horizontal bone loss of 29 to 63 percent within six months of extraction.

A cohort of 162 zirconia single crowns reported failure-free survival of 93.1% for monolithic and 96.2% for partially veneered designs. Where zirconia leads.

A systematic review of 13 randomised trials found denture adhesives significantly improve retention and stability, with low to moderate certainty of evidence.

Five-year survival was 96.8% for monolithic zirconia and 97.3% for veneered zirconia in a meta-analysis of 64 studies. Here is how translucency compares.

A dental crown caps the whole tooth; five-year survival runs from 96.8% (monolithic zirconia) to 98.5% (lithium disilicate) in a 64-study meta-analysis.

Across 64 studies, five-year crown survival was 98.5 percent for monolithic lithium disilicate, 97.1 percent for metal-ceramic and 96.8 percent for zirconia.

A 5-tooth bridge is a fixed restoration of five crown units, usually three pontics on two abutment teeth; 92.9% of veneered zirconia bridges survived 5 years.