There are two areas that you need to finish and refine in particular:
- Margins
- Occlusal Anatomy
When refining on the shoulder margin though, be careful not to get rid of the rounded internal line angle and make it acute. So only apply the hand instrument to the outer side of the shoulder. You may use an end cutting bur, but do not focus it on using on that irregular portion only because you may end up gouging that area instead. Do glide the bur in wide sections, as if sweeping the bumps away.
You may want to use a perio probe to check the taper of the walls. Place it close, touching the entire length of the wall. If there is a gap somewhere between the instrument and the wall, it means that the wall is uneven or has an undercut. Remove this by carefully gliding through, sweeping the entire wall that covers at least 1.5mm.
Feel with your finger if there are any sharp edges along the incisal area. If there are any, you may smoothen this out with a hand instrument.