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Lab talk, the good, the bad, and the ugly
Porcelain
Zirconia Implant question
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<blockquote data-quote="trianglej" data-source="post: 57095" data-attributes="member: 4264"><p>What we get after a design is a rough image that has to compensate for the size of the burs used. Some areas may get over milled to allow for this. Once the mill is accomplished and the unit is removed from it's base, you can do some minor adjustments to remove sprue attachment and/ or mill marks with a diamond bur or impregnated silicone wheel to smooth it out being that the material is the consistency of a block of chalk. then it should be cleaned prior to sintering. after sintering the zirconia may be adjusted minimally with a diamond bur and lots of water( a "presto aqua" works great for this) and avoiding the "sparking" that may occur( which is when the fracturing occurs). There may be a bit of surface texture left below the margin line of an abutment that can be "polished" with Brassler Dialite wheels. Green - is coarse and will do some reduction. Blue- is medium and Pink-is high lustre. You may have had to adjust a zirconia coping prior to layering porcelain, after which Ivoclar suggests a "healing" or regeneration cycle before applying the zirliner.</p><p>The key question is what is the company's guarantee and failure policy?</p><p>I don't have any fear of adjusting zirconia that is sintered as long as I go "low and slow" with plenty of water to keep it cool.</p></blockquote><p></p>
[QUOTE="trianglej, post: 57095, member: 4264"] What we get after a design is a rough image that has to compensate for the size of the burs used. Some areas may get over milled to allow for this. Once the mill is accomplished and the unit is removed from it's base, you can do some minor adjustments to remove sprue attachment and/ or mill marks with a diamond bur or impregnated silicone wheel to smooth it out being that the material is the consistency of a block of chalk. then it should be cleaned prior to sintering. after sintering the zirconia may be adjusted minimally with a diamond bur and lots of water( a "presto aqua" works great for this) and avoiding the "sparking" that may occur( which is when the fracturing occurs). There may be a bit of surface texture left below the margin line of an abutment that can be "polished" with Brassler Dialite wheels. Green - is coarse and will do some reduction. Blue- is medium and Pink-is high lustre. You may have had to adjust a zirconia coping prior to layering porcelain, after which Ivoclar suggests a "healing" or regeneration cycle before applying the zirliner. The key question is what is the company's guarantee and failure policy? I don't have any fear of adjusting zirconia that is sintered as long as I go "low and slow" with plenty of water to keep it cool. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
Zirconia Implant question
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