Hi, As I can scan impressions with DOF scanner I was asned to do a post and core work. Should I select inlay for it and then manually build it up or is there some other method? My other question is about how to make a snapon smile in exocad? Best regards.
Snap on... Tricky. Needs retention like a partial denture? Or will be glued? Yes inlay for post. Scan impression and your software auto invert the mesh norms for exocad.
I made myself some out of metal. I block-out the model with wax by hand a little-bit interprox embrasures Just a little fill in the deep groove between teeth. Not much. To help with insertion path I make One margin to surround the entire area I want new surface and make One unit Simple offset coping and freeform. Or Copy-Waxup
There is 100x options. Wax-up copy? Maybe use bite-splint somehow? New Partial Denture module +Crown&Bridge is possible soon!! I 3d printed and cast in both Palladium and Gold to make stupid Grill. It "popped" On and Off with retention. 10 units....facial only. All Premolars and anteriors NO Trim undercuts and "Use the Force" for defining path of insertion and margin, etc
I do "snap on smiles" as veneers, and then splint them together ignoring the blockout for undercuts. the only issues Ive had are3 that the connectors sometimes will invade the inside of the pattern. Inlay/Onlay works too.
It is hard to keep margin min-thickness from hitting each other, and connector issues when you divide into singles all bridged together. Then, we get conflict in software and unexpected results Can't have margin overlap either. I prefer One continuous margin and One unit set-up for the CAD. Manual block-out of model before scanning with just a quick swipe of wax
Snap on smiles are usually made out of acetal resin which is a little bit flexible. You don't want to block out undercuts unless they are very large since they are what the prosthesis gets the retention from. I believe you can go as thin as .5mm in thickness with the acetal resin. My closest comparison would be that it is a tooth colored essix retainer with scalloped margins. They also usually have holes in the occlusal to keep the occlusion the same unless they are purposely trying to open the bite. Las for how to design this in exocad... I'll let the experts here handle that since that's beyond my skill level
I place 14 pontics and do a bridge and save the dental cad. Change to bitesplint, right-click the splint in expert mode and convert it to waxup. My bitesplint blockbottom and spline is also my waxup bottom.... Is the splint converted I delete the waxupsplint using add mesh in tools and load my anatomical pontic bridge. Rightclick the bridge, edit waxup and delete intersecting parts of the bridge, deleting all lower stl fragment and start the guide with waxup creation. Additionaly: if you wanna use spacer, activate implantbased to bitsplint in workparamsconfig tool. Than activate to your splint on top the substructure scan. This small setting allow you also to use bite splints as bar secondary, cause of the possibility to generate a full crownbottom with all its settings after the waxup creation of the splint. The algorithms for offset coping and veneer/inlay are limited when the bar gets bigger it cuts automatically the bottom in the molar area away.
