Some time ago, there was a problem with his previous crown. It was leaking.
He told me, "just do what you think is right, doc."
I told him gold was king. He let me do it. We took the impression with hydrocolloid...twice.
Retention slots were drilled in the second time to improve longevity on a very short, worn out tooth.
Then, I spent 8 hours waxing his crown...attempt 1 was useless since we needed a new impression and retention slots. After another 8 hours, the second attempt at waxing his crown was a fail (wax cracked during storage). After yet another 4 hours, the margin broke off...my mentor told me to use a different wax. And after another 2 hours, we had a wax pattern...we casted the crown in JCB gold from Jenson industries--about $700 worth of gold (including the button).
It was a fail. The sprue was too short. There was a bubble right in the middle of the crown.
After another 4 hours of waxing, I presented another wax pattern to my mentor...which was deemed "not tooth shaped." He rewaxed my crown in under 20 minutes. We resprued, and recasted the crown.
Today, I spent 2 and a half hours to cement a crown.
I'd repolished the mesial contact to a perfect, wide contact.
The crown would only seat in one direction, with a 2-5 degree tolerance of seating.
Also, this is tooth 15...the last tooth in the mouth.
Lastly, the crown would be almost impossible to remove once seated...even without cement.
Translation....good God this is hard!
5 attempts later, we finally have the thing perfectly seated.
The calibrated, single dose glass ionomer cement would set before I could fully seat this thing.
The margins were burnished and polished flush to the tooth.
The occlusion was adjusted to have 3 point contacts on each teeth.
This is the very best dentistry that I can humanly do...but I wonder at the cost (to me).
Anyways, I owe Larry a debt of gratitude for his patience and understanding.