Thanks Dr Klim for validating what I've been advocating for years, can't imagine those who were even milling emax at zero margin thickness over the years. I think this really goes for onlays/inlays as well regarding margin thickness on occsual surfaces then polished to perfection. Thanks again for producing meaningful videos. 100um!!
Actually 100 is the default setting on our primescan but I found the margins to be "hanging over" to much on the teeth so I reduced it to 50. How do you know how much thinning is too much without trying the restauration in? Much appreaciate your videos and greetings from Germany!
Thinning the margins is a skill set that is learned. Over-pressing and milling thicker margins have long been in the workflow mix for managing ceramics. Labs have models and die(s) to work this process; we learn how to do it in the mouth. I use a coarse knife edge silicone wheel and finish the restoration chairside before cementation. As of now in the US, the margin thickness parameter has been 50 um. I have recommended 100 um.
Depends on the milling unit and speed of the mill. In general, I use fine or extra fine mill mode. My occlusal Contacts Strength is -50, Proximal contacts stength is -25. For MC XL Occlusal Offset is -175, Primemill Occlusal Offset is zero.
Can you define margin chipping? Is that on the cameo or intaglio surface of the margin or the vertical aspect of the margin itself which would cause an open margin?
Hi Yoni, the margin thickness extends externally to the margin. The recommended marginal thickness of 100 is a calibrated metric to avoid microchipping (external edge of the margin) that will result in an open or shy margin. Once machined, then the margin is polished back. Each material mills differently and must be calibrated accordingly. I made this video because as an educator, I get this question often.
Hi Dr Klim! Could You please tell Your softwares version? I have 5.13, but I could not find the option to modify marginal thickness for crowns. I see it for inlays, but the option is missing in the crown preferences! Thanks, I appreciate Your help!
Hi Tibor. The Margin Thickness Parameter is accessed once the restoration has been proposed in the Design Phase Screen. Go down to Step Menu, click on Parameters, scroll down to Margin Parameters, unlock and reset, click on Okay, then Click Edit Restoration on Step Menu. Margin Parameters cannot be accessed through default parameters in configuration. It has been preset by the manufacture. It can only be changed in the design screen for each unique restoration proposal. All the best.
Hello, I'm very new to this and didn't even study dental techniques at school but I'm learning, so I hope you won't mind me asking. Is what you are saying about milling margins for emax is also valid for other materials, such as vitablocs mark 2 or enamics?
Milling/grinding ceramics depends on the behavior of the particular crystal type and brand. For instance, Enamic has a polymer component, therefore the milling parameter can be at 50 um with no chipping. Unless EF bur milling, I keep my ceramics at 100 um with the left 12 traditional step bur on the MC XL system. All the best.
Thanks Dr Klim for validating what I've been advocating for years, can't imagine those who were even milling emax at zero margin thickness over the years. I think this really goes for onlays/inlays as well regarding margin thickness on occsual surfaces then polished to perfection. Thanks again for producing meaningful videos.
100um!!
agree
Actually 100 is the default setting on our primescan but I found the margins to be "hanging over" to much on the teeth so I reduced it to 50. How do you know how much thinning is too much without trying the restauration in?
Much appreaciate your videos and greetings from Germany!
Thinning the margins is a skill set that is learned. Over-pressing and milling thicker margins have long been in the workflow mix for managing ceramics. Labs have models and die(s) to work this process; we learn how to do it in the mouth. I use a coarse knife edge silicone wheel and finish the restoration chairside before cementation. As of now in the US, the margin thickness parameter has been 50 um. I have recommended 100 um.
What are the standard parameters for the rest of the settings for posterior emax?
Depends on the milling unit and speed of the mill. In general, I use fine or extra fine mill mode. My occlusal Contacts Strength is -50, Proximal contacts stength is -25. For MC XL Occlusal Offset is -175, Primemill Occlusal Offset is zero.
Can you define margin chipping? Is that on the cameo or intaglio surface of the margin or the vertical aspect of the margin itself which would cause an open margin?
Hi Yoni, the margin thickness extends externally to the margin. The recommended marginal thickness of 100 is a calibrated metric to avoid microchipping (external edge of the margin) that will result in an open or shy margin. Once machined, then the margin is polished back. Each material mills differently and must be calibrated accordingly. I made this video because as an educator, I get this question often.
Hi Dr Klim! Could You please tell Your softwares version? I have 5.13, but I could not find the option to modify marginal thickness for crowns. I see it for inlays, but the option is missing in the crown preferences! Thanks, I appreciate Your help!
Hi Tibor. The Margin Thickness Parameter is accessed once the restoration has been proposed in the Design Phase Screen. Go down to Step Menu, click on Parameters, scroll down to Margin Parameters, unlock and reset, click on Okay, then Click Edit Restoration on Step Menu. Margin Parameters cannot be accessed through default parameters in configuration. It has been preset by the manufacture. It can only be changed in the design screen for each unique restoration proposal. All the best.
@@KlimDDS Thank You! I've found it! You are the best! 🙂🎉
Hi Jim what are you using to finish your margins there on the emax?
The green coarse knife polishing wheel by Meisinger
Hello, I'm very new to this and didn't even study dental techniques at school but I'm learning, so I hope you won't mind me asking.
Is what you are saying about milling margins for emax is also valid for other materials, such as vitablocs mark 2 or enamics?
Milling/grinding ceramics depends on the behavior of the particular crystal type and brand. For instance, Enamic has a polymer component, therefore the milling parameter can be at 50 um with no chipping. Unless EF bur milling, I keep my ceramics at 100 um with the left 12 traditional step bur on the MC XL system. All the best.