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Lab talk, the good, the bad, and the ugly
Metal
Metal poll
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<blockquote data-quote="toothacts" data-source="post: 216" data-attributes="member: 54"><p><strong>toothacts</strong></p><p></p><p>Yea, I have only one porcelain furnace also and prefer to use the silver free alloys. The silver content alloys contaminate the porcelain furnace with silver oxides which tend to discolor your porcelain restorations. A build-up of silver oxide in your furnace over time will affect all future porcelain restoratons. </p><p></p><p>Currently I use Jensen JP1 51.5% au 38% pd and Stability 78% pd 2% au with Creation CC. Most importantantly is to go with a reputable company making sure your porcelain has a compatable CTE for your alloy.</p><p></p><p>Even the silver free semi-precious alloys produce an over abundance of oxide when fired and require heavy layers of opaque to mask out the graying effect oxide migration has on vitality,especially the white A1 shades. I like to keep the shade integrity as true to the precribed shade tab as possible, by keeping my opaque layer thin and appying as much porcelain as neccessary, allowing for as much color depth as possible.</p><p></p><p>I have used Non-precious alloys in the past; Williams Lite-Cast B, Rexillium III & Argelloy NP, I know non-precious is a bad word but I have never had a remake in 30 years with NP due to bio-compatablity. The shade integrity is great ! almost zero oxide migration.</p><p></p><p>If I had my choice however I would prefer to use gold for all of my PFMs.</p><p></p><p>Alan.</p></blockquote><p></p>
[QUOTE="toothacts, post: 216, member: 54"] [b]toothacts[/b] Yea, I have only one porcelain furnace also and prefer to use the silver free alloys. The silver content alloys contaminate the porcelain furnace with silver oxides which tend to discolor your porcelain restorations. A build-up of silver oxide in your furnace over time will affect all future porcelain restoratons. Currently I use Jensen JP1 51.5% au 38% pd and Stability 78% pd 2% au with Creation CC. Most importantantly is to go with a reputable company making sure your porcelain has a compatable CTE for your alloy. Even the silver free semi-precious alloys produce an over abundance of oxide when fired and require heavy layers of opaque to mask out the graying effect oxide migration has on vitality,especially the white A1 shades. I like to keep the shade integrity as true to the precribed shade tab as possible, by keeping my opaque layer thin and appying as much porcelain as neccessary, allowing for as much color depth as possible. I have used Non-precious alloys in the past; Williams Lite-Cast B, Rexillium III & Argelloy NP, I know non-precious is a bad word but I have never had a remake in 30 years with NP due to bio-compatablity. The shade integrity is great ! almost zero oxide migration. If I had my choice however I would prefer to use gold for all of my PFMs. Alan. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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