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Lab talk, the good, the bad, and the ugly
Metal
Auriloy
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<blockquote data-quote="Al." data-source="post: 9829" data-attributes="member: 382"><p>With the economy Im getting more requests for NP.</p><p>Ive used rex 111 for many yrs with no problem.</p><p>Like Sixpack of Corona said, you need an hotter flame or youll have short margins and give it one half extra turn. I use 4 1/2 and make sure you have a large button. It is a light metal and needs that extra umph to get it all in for a complete casting.</p><p>It dosnt melt it slumps but wait to sling it till it first gets white.</p><p>Never reuse your button. Always use 100% new metal. Throw your buttons away.</p><p>If you make a hole dont waste your time soldering it recast. If you have a bridge that rocks youll get much better results if you cast to instead of soldering. Its easy and as quick (working time) as soldering and stronger and more dependable then trying to solder NP (at least for me). That technique Ive used forever with bridges still in the mouth 20 yrs later. But I know guys that do solder NP but ive seen plenty break at the solder joint and get bubbling.</p><p></p><p>Polishing a fmc cast in NP isnt any problem as long as you go over the surface first with a green stone then rubber wheel it. It shines up as nicely as white gold. Green stone, rubber wheel, run through your anatomy with a highspeed then clip onto the crn with hemostats and brush with that green compound from cromolite using a robinson brush and it will polish slicker-n-snot.</p><p>You dont have to hit every nook and cranny on the occlusal surface with the rubber wheel just with the high speed or stone because the compound will polish it up. </p><p>Also clip on to the crn with hemostats to rubber it. I do that for gold crns also, I havnt burned my finger tips since.</p><p></p><p>The one negative is the margins will not burnish so they must be perfict in your casting.</p><p>You will also need to use more special liquid in your investment because you dont get as much expansion as with N or HN alloys.</p><p></p><p>Theres millions of NP partials in peoples mouths with no problems.</p><p>Most of the trash talk for using NP for C & B comes from suppliers. They dont make money selling an OZ of NP for $10 like they do and selling an OZ of HN for $700+.</p></blockquote><p></p>
[QUOTE="Al., post: 9829, member: 382"] With the economy Im getting more requests for NP. Ive used rex 111 for many yrs with no problem. Like Sixpack of Corona said, you need an hotter flame or youll have short margins and give it one half extra turn. I use 4 1/2 and make sure you have a large button. It is a light metal and needs that extra umph to get it all in for a complete casting. It dosnt melt it slumps but wait to sling it till it first gets white. Never reuse your button. Always use 100% new metal. Throw your buttons away. If you make a hole dont waste your time soldering it recast. If you have a bridge that rocks youll get much better results if you cast to instead of soldering. Its easy and as quick (working time) as soldering and stronger and more dependable then trying to solder NP (at least for me). That technique Ive used forever with bridges still in the mouth 20 yrs later. But I know guys that do solder NP but ive seen plenty break at the solder joint and get bubbling. Polishing a fmc cast in NP isnt any problem as long as you go over the surface first with a green stone then rubber wheel it. It shines up as nicely as white gold. Green stone, rubber wheel, run through your anatomy with a highspeed then clip onto the crn with hemostats and brush with that green compound from cromolite using a robinson brush and it will polish slicker-n-snot. You dont have to hit every nook and cranny on the occlusal surface with the rubber wheel just with the high speed or stone because the compound will polish it up. Also clip on to the crn with hemostats to rubber it. I do that for gold crns also, I havnt burned my finger tips since. The one negative is the margins will not burnish so they must be perfict in your casting. You will also need to use more special liquid in your investment because you dont get as much expansion as with N or HN alloys. Theres millions of NP partials in peoples mouths with no problems. Most of the trash talk for using NP for C & B comes from suppliers. They dont make money selling an OZ of NP for $10 like they do and selling an OZ of HN for $700+. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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