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Orthodontic material (Fixed appliances (Plastic brace (more aesthetic, low…
Orthodontic material
Fixed appliances
Ceramic brace
aluminum oxide, monocrytstalline, polycrystalline (more translucent)
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Self ligating brace
--> hold wire in closing system,
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Orthodontic wires
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stainless tell, cobalt, chrome or titanium
Handling
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- Prepare enamel surface by etching
with 37% orthophosphoric acid (common, effective)
- eliminate calculus
- acid for 15 sec
- no saliva, if yes, redo./// * aggressive on enamel
with polyacrylic acid: ions act with enamel
--> get calcium sulphate, stick adhesive resin
--> hard to manipulate, incorrect washing ↓ adhesive resistance
--> don't damage enamel that much, debond easier
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Resins
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Light- cure resins:
- faster, ligating wire immediately
- adhesion capacity less than auto-curing resins
Auto- curing resins:
- wait for 5 mins to complete polymerization
- highest traction resistance
Glass ionomer cement modified with resins
- not affect by etching or saliva
- keep and pure fluoride
- not damage enamel (easy debonding)
- less traction resistance than other
Brace adhesion
Consist of 3 components, 2 interfaces
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substratum:
could be enamel, metal, ceramic, composite
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