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Lab talk, the good, the bad, and the ugly
3D Printer
3D printing night guards
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<blockquote data-quote="shakkazulu" data-source="post: 337898" data-attributes="member: 23283"><p>Hi Kevin. We used to make our night guards with Eclipse, which was discontinued. So we went to heat cure overnight and we think it’s too labor intensive (I don’t),so my lab went digital with night guards. We have a Nexdent 5100, so we started using it for night guards. We have a Kavo scanner and a 3shape scanner. So we scan models, outsource the design, and print them. They were coming out loose and warped, the occlusal surface was rough and needed to be spotted in. We found that repositioning the night guards in the tray, adding more supports, and improving post printing has helped, but the resolution is terrible. There is what I call “wood grain “ in the intaglio. This intaglio works like a saw blade. When I relieve the very slight undercuts to get the night guards on the model, (the ‘top’ of the blades),my retention gets lost. Also when seating, the doctors models get a destroyed in the anterior. I asked if we could improve the resolution and was told that the only FDA approved material for the Nextdent is ortho rigid and there is a limitation on the resolution. Almost all The night guards were coming out too loose -I asked our designer to do no block out and make them as tight as they would be in analog and they still came out loose once I relieved the undercuts. We stopped using the nexdent. I saw a thread here about people using cheap printers. The photographs of models printed from these looked better so one of our employees bought one and printed a model that had much less wood grain, so we bought one ( an elegoo Mars 3 ) and it prints better, but only slightly, same resolution issues, and slight warping. I can run boiling water over the night guard When it’s on the model and press down And that helps. I suspect that the warping is a post printing issue. But the wood grain is still there, again due to material resolution limitations. But the fit is slightly better. Do you have this wood grain issue with your nexdent? Is there a way to eliminate the grain?</p><p> If you are having success with your printer, could I ask you a huge favor? Could I send you a design to print so I can show my people that the nexdent can print good night guards? I would go back to the nexdent if the resolution could be better.</p><p> If I were to advise someone wanting to go digital with night guards, I’d tell them to research a material that gets good resolution ( if there is a material that gets no wood grain) then buy the printer that supports it. It seems that no matter what resolution the printer is capable of, there are severe limitations with the resolution of the material you use. </p><p> To me, digital is not ready to make night guards until the resolution (material) can be improved. Is this true or are we doing something wrong? People on DLN are printing night guards and claim success but I am not tech savvy enough to guide my people to get good results. Please help! I would go to a lab anywhere in the U.S. to learn how to print right and then teach my printer person what to do. I am just a tech, but I deal with the problems and so I end up having to try to solve them.</p></blockquote><p></p>
[QUOTE="shakkazulu, post: 337898, member: 23283"] Hi Kevin. We used to make our night guards with Eclipse, which was discontinued. So we went to heat cure overnight and we think it’s too labor intensive (I don’t),so my lab went digital with night guards. We have a Nexdent 5100, so we started using it for night guards. We have a Kavo scanner and a 3shape scanner. So we scan models, outsource the design, and print them. They were coming out loose and warped, the occlusal surface was rough and needed to be spotted in. We found that repositioning the night guards in the tray, adding more supports, and improving post printing has helped, but the resolution is terrible. There is what I call “wood grain “ in the intaglio. This intaglio works like a saw blade. When I relieve the very slight undercuts to get the night guards on the model, (the ‘top’ of the blades),my retention gets lost. Also when seating, the doctors models get a destroyed in the anterior. I asked if we could improve the resolution and was told that the only FDA approved material for the Nextdent is ortho rigid and there is a limitation on the resolution. Almost all The night guards were coming out too loose -I asked our designer to do no block out and make them as tight as they would be in analog and they still came out loose once I relieved the undercuts. We stopped using the nexdent. I saw a thread here about people using cheap printers. The photographs of models printed from these looked better so one of our employees bought one and printed a model that had much less wood grain, so we bought one ( an elegoo Mars 3 ) and it prints better, but only slightly, same resolution issues, and slight warping. I can run boiling water over the night guard When it’s on the model and press down And that helps. I suspect that the warping is a post printing issue. But the wood grain is still there, again due to material resolution limitations. But the fit is slightly better. Do you have this wood grain issue with your nexdent? Is there a way to eliminate the grain? If you are having success with your printer, could I ask you a huge favor? Could I send you a design to print so I can show my people that the nexdent can print good night guards? I would go back to the nexdent if the resolution could be better. If I were to advise someone wanting to go digital with night guards, I’d tell them to research a material that gets good resolution ( if there is a material that gets no wood grain) then buy the printer that supports it. It seems that no matter what resolution the printer is capable of, there are severe limitations with the resolution of the material you use. To me, digital is not ready to make night guards until the resolution (material) can be improved. Is this true or are we doing something wrong? People on DLN are printing night guards and claim success but I am not tech savvy enough to guide my people to get good results. Please help! I would go to a lab anywhere in the U.S. to learn how to print right and then teach my printer person what to do. I am just a tech, but I deal with the problems and so I end up having to try to solve them. [/QUOTE]
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