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

  1. Brace factor

gird sustem welded to base with surface treatment

system with laser-sculpted base

gird sustem welded to base

chemical adhesion base system

  1. Prepare enamel surface by etching

with 37% orthophosphoric acid (common, effective)

  1. eliminate calculus
  2. 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

  1. 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

  1. not affect by etching or saliva
  2. keep and pure fluoride
  3. not damage enamel (easy debonding)
  4. less traction resistance than other

diacrylic- metallic braces
unfilled acrylic resins- plastic/ ceramic braces

Light- cure resins:

  1. faster, ligating wire immediately
  2. adhesion capacity less than auto-curing resins

Auto- curing resins:

  1. wait for 5 mins to complete polymerization
  2. highest traction resistance