I got two crowns a year ago, two molars next to each other, but -- and this was completely new to me -- they were Same Day Crowns. Who knew? She did the drilling and filing down, took some kind of impressions and measurements (in some new high-tech process, all computerized), made sure I was numb and brushed something on the teeth to further protect them, and told me come back in three hours. When I got back, the two new porcelain crowns (I think they're still porcelain, but maybe the material is something new, too?) were waiting on the tray for me. Getting them in and positioned perfectly was awkward as hell (which is partly my fault, as I'm a royal pain in the bloomin' arse to do dental work on), but it was all done in an hour or so and I walked out of there whole.