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12 Cards in this Set
- Front
- Back
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Tooth surface hydrophilic or hydrophobic |
Hydrophilic (unlike most dental materials) |
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Properties of good adhesive |
high bond strength/safe/immediate and long lasting/easy to use/good marginal seal |
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How to adhesively bond to enamel |
Acid-Etch technique |
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What should have a higher surface tension for good wetting (liquid material being applied or solid surface) |
Surface tension/energy of solid surface should be a little higher |
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Is composite hydrophilic or hydrophobic |
Hydrophobic (non-polar) |
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How to improve wetting |
remove smear layer by acid-etch technique |
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what is the smear layer |
layer of tooth debris left when a tooth is cut with a drill |
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Effects of acid etch |
-Removes smear layer -dissolves HAP crystals to cause loss of prism structure to allow resin to penetrate (micro-mechanical retention) |
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What is v important for micro-mechanical retention after acid etch |
Tag formation (which bond to resin) |
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After etching, what is applied ? |
unfilled resin (Bis-GMA/adhesive resin) |
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What must be satisfied when applying resin? |
MUST HAVE DRY SURFACE |
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Roughly how deep does the resin penetrate |
30 microns |
