When delivering a single crown, probably the toughest tooth we can prep for is the second molar.
There are a couple things to be aware of when prepping second molars:
1. Limited Opening
One, usually, there's a limited opening in that area, so when you are prepping the tooth, you have to give the patient breaks because you're going to have to ask them to open quite a bit.
2. Wear and Tight Neutral Zone
The second thing, which is more of a concern, is the wear in that area and also the tight neutral zone.