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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Intaglio surface of E.max
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<blockquote data-quote="JayDO" data-source="post: 24996" data-attributes="member: 1614"><p>Guys</p><p>Please let me clear a few things up.</p><p></p><p>1. Blasting of lithium disilicate prior to seating is a huge no no. This is stated numerous times throughout the instructions for use. It has the potential to weaken the material.</p><p></p><p>2. Etching of the internal surfaces should be done with 5% HF etch for no more than 20 seconds. Etching for longer can inhibit bond strengths. Most labs do this when the restoration leaves their building because few doctors do it. It is important to find out if the doctor is doing HF etching chairside because over etching is possible with lithium disilicate.</p><p></p><p>3. Silane should always be applied chairside as it will lose effectiveness when left exposed to air for extended periods of time. It should also be applied after try in as the residue from try in paste will make it ineffective. The try-in can be cleaned out using water and then the restoration should be thoroughly dried before the silane is applied.</p><p></p><p>4. Phosphoric etch is used chairside to condition the prepared tooth and open the dentin tubules so that the primer can infiltrate them and create a micro mechanical bond between the cement and the dentin. The silane creates the bond between the tooth and the cement.</p><p></p><p>I hope this helps.</p></blockquote><p></p>
[QUOTE="JayDO, post: 24996, member: 1614"] Guys Please let me clear a few things up. 1. Blasting of lithium disilicate prior to seating is a huge no no. This is stated numerous times throughout the instructions for use. It has the potential to weaken the material. 2. Etching of the internal surfaces should be done with 5% HF etch for no more than 20 seconds. Etching for longer can inhibit bond strengths. Most labs do this when the restoration leaves their building because few doctors do it. It is important to find out if the doctor is doing HF etching chairside because over etching is possible with lithium disilicate. 3. Silane should always be applied chairside as it will lose effectiveness when left exposed to air for extended periods of time. It should also be applied after try in as the residue from try in paste will make it ineffective. The try-in can be cleaned out using water and then the restoration should be thoroughly dried before the silane is applied. 4. Phosphoric etch is used chairside to condition the prepared tooth and open the dentin tubules so that the primer can infiltrate them and create a micro mechanical bond between the cement and the dentin. The silane creates the bond between the tooth and the cement. I hope this helps. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Intaglio surface of E.max
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