Six hour Crown

March 3, 2010

Had one of my clients call this weekend and ask for a favor.  It seems a buddy was coming into town for two days, and needed a crown.  He asked if it would be possible for him to impress last night; have the case couriered to my house; then have an e.Max CAD crown produced and back to him for cementation this afternoon.

Absolutely.

The case was dropped off about 8:30 last night.  I brought it in with me this morning – he failed to mention it was an implant crown over a Straumann stock abutment on #14.  We started the model work, complete with removable tissue, around 5:30am.  I had the case in hand by 7:00am.

We scanned the abutment analog and the model using our 3Shape 700.  The design was a little tricky as the implant was placed well to the palatal.  After some finagling, we arrived at a design that provided good esthetics, and met the tissue without creating any type of ridge lap.

Once I was happy with the design, we milled the restoration using our B&D Origin Pro 5000. To be candid – I screwed up the milling a couple of times due to my unfamiliarity with the software (We’ve only done three of these to date!).

Once I fixed my CAM set-up flaws, I got a nice crown with great anatomy.  I spent about five minutes adjusting the contacts and occlusion -most of that time was  removing most of the “bounce” associated with the tissue facsimile.

A quick 30-minute speed crystallization, and a glaze firing (I dont’ have the guts to do the crystallization/shading/glazing in one firing), we had a damn nice result.  The internal fit was great and the margins were completely closed.

The crown left the building around noon.  Insertion is scheduled for this evening.  Hope to post pics if I can get the client to share…

FYI – Received a message from the client that night.  The crown was seated with a slight adjustment to the proximal contacts; “looked great”; and the patient caught his early evening flight with plenty of time to spare!  Also, if you read the comments to this post you will note that the Pro 5000 is not a sanctioned milling machine for e.Max CAD.  No one from Ivoclar has told me exactly what that means – you’ll have to draw your own conclusions.  Just recognize that should request this “rush” service, you are doing so with the realization that the milling process is “unauthorized”.

© 2010, Jeff Saylors. All rights reserved.