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<blockquote data-quote="greeny" data-source="post: 357411" data-attributes="member: 6912"><p>With just a few small changes to your material choices (and components) this will be easily achievable without additional scrutiny from the FDA:</p><p></p><p><strong>1) Switch from zirconia to PMMA:</strong> Zirconia has a long sintering cycle. PMMA will be ready for placement right out of the machine (after you knock off a few sprues, of course). I also have first-hand experience with producing single/locking zirconia interface geometries that were intended for direct-to-implant use. Long story short, they fail at an unacceptable rate. There are other benefits to use PMMA for a temp, but these are the most noteworthy.</p><p></p><p><strong>2) Switch to using a ti-base for a 2-piece screw retained crown:</strong> In most cases, these components are FDA registered, and the part you're required to mill in-house much easier to produce - it's essentially a PMMA crown over a mini-abutment with a screw access hole. As a bonus, this doesn't require milling equipment that's quite as accurate or robust - or unique milling tools and strategies for producing interface geometries.</p><p></p><p>Here's the part you'd be milling in-house if a ti base was being used; any of the machines/distributors we work with could deliver this solution to you, and you'll be making these parts on day 1 of training, before you even break for lunch <img class="smilie smilie--emoji" loading="lazy" alt="😉" title="Winking face :wink:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f609.png" data-shortname=":wink:" /></p><p></p><p>[ATTACH=full]42155[/ATTACH] [ATTACH=full]42160[/ATTACH]</p><p></p><p>Notice inside the pink abutment base boundary line above, there are only large radius corners - all of which can be achieved with a standard ballnose tool. And here's the same view, but translucent:</p><p></p><p>[ATTACH=full]42158[/ATTACH]</p><p></p><p>Plus a nice side-view, just for good measure!</p><p></p><p>[ATTACH=full]42159[/ATTACH]</p><p></p><p>And I'm about to open a whole new can of worms, but a 1-piece PMMA screw retained crown incl. the interface geometry is technically possible. Although I'd still suggest using a ti base.</p></blockquote><p></p>
[QUOTE="greeny, post: 357411, member: 6912"] With just a few small changes to your material choices (and components) this will be easily achievable without additional scrutiny from the FDA: [B]1) Switch from zirconia to PMMA:[/B] Zirconia has a long sintering cycle. PMMA will be ready for placement right out of the machine (after you knock off a few sprues, of course). I also have first-hand experience with producing single/locking zirconia interface geometries that were intended for direct-to-implant use. Long story short, they fail at an unacceptable rate. There are other benefits to use PMMA for a temp, but these are the most noteworthy. [B]2) Switch to using a ti-base for a 2-piece screw retained crown:[/B] In most cases, these components are FDA registered, and the part you're required to mill in-house much easier to produce - it's essentially a PMMA crown over a mini-abutment with a screw access hole. As a bonus, this doesn't require milling equipment that's quite as accurate or robust - or unique milling tools and strategies for producing interface geometries. Here's the part you'd be milling in-house if a ti base was being used; any of the machines/distributors we work with could deliver this solution to you, and you'll be making these parts on day 1 of training, before you even break for lunch 😉 [ATTACH type="full" width="402px" alt="pmma_ti_base_hyperDENT_2.png"]42155[/ATTACH] [ATTACH type="full" width="419px" alt="pmma_ti_base_hyperDENT_1.png"]42160[/ATTACH] Notice inside the pink abutment base boundary line above, there are only large radius corners - all of which can be achieved with a standard ballnose tool. And here's the same view, but translucent: [ATTACH type="full" width="900px" alt="pmma_ti_base_hyperDENT_3.png"]42158[/ATTACH] Plus a nice side-view, just for good measure! [ATTACH type="full" width="335px" alt="pmma_ti_base_hyperDENT_4.png"]42159[/ATTACH] And I'm about to open a whole new can of worms, but a 1-piece PMMA screw retained crown incl. the interface geometry is technically possible. Although I'd still suggest using a ti base. [/QUOTE]
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