Orthodontic material
Fixed appliances
Ceramic brace
Self ligating brace
--> hold wire in closing system,
Metallic braces
Plastic brace
Orthodontic bands
--> for molars due to hard to get dry surface + receive mechanical overload
Lingual brace
Brace adhesion
Consist of 3 components, 2 interfaces
Adhesion orthodontic
Mechanical: irregular surface
Chemical: very tight adhesion
Orthodontic wires
Handling
brace
cement or adhesive
substratum:
could be enamel, metal, ceramic, composite
cement- substratum
cement- brace
- Brace factor
gird sustem welded to base with surface treatment
system with laser-sculpted base
gird sustem welded to base
chemical adhesion base system
- 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
- Adhesive materials
Removal appliances
with fluorhydric acid
--> use ceramic brace
stainless steel and titanium
high mechanical resistance to avoid deformation when eating
by casting (molds)
by one piece or monoblock
--> use Cad-Cam tech.
aluminum oxide, monocrytstalline, polycrystalline (more translucent)
physical properties
low traction resistance
toughness: avoid contact in enamel and ceramic brace
fracture
hard to debond
more aesthetic
low friction resistance
polycarbonate
easy to debond
slot deformation if wire is tight
for aesthetic
galls on soft tissue
use cold-cured resins
higher elastic module than plastic module
prevent deformation
stainless tell, cobalt, chrome or titanium
Properties
impermeability
enough working time
enough adhesion
easy way to eliminate excess cement
enough tolerance in wet surface
easy debonding
Resins
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
diacrylic- metallic braces
unfilled acrylic resins- plastic/ ceramic braces
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