Fixed appliances. Development of orthodontics in china Removable Begg Edgewise Straightwire (pre-adjusted)

Fixed appliances

Development of orthodontics in china

• Removable

• Begg

• Edgewise

• Straightwire (pre-adjusted)

Bracket

• Metal

• Ceramic

• Plastic

Disadvantages of ceramic brackets

• The bond is too strong

• Brittle

• Too hard

• High friction

Band • (1) Buccal and often lingual attachments are s

oldered or welded.• (2) Piror to placement of a band it may be nec

essary to separate the adjacent tooth contacts. • (3) There are different sizes of bands for diffe

rent sizes of molar.• (4) Glass ionomer cement is used for band ce

mentation.

Archwires

• Stainless steel wire

• NiTi wire

• Mutistrand wire

• Round wire: 0.014”,16”,18”

• Rectangular wire:0.016”x0.022”,et al.

Sequence

• From thin to thick

• From NiTi to stainless steel

• From round to rectangular

• First-order bends: horizontal plane

• Second-order bends: vertical plane

• Third-order bends: torque

Orthodontic adhesives

• Band cement: glass ionomer, zinc phosphate

• Bonding adhesive: chemical-cured, light-cured

Chemical-cured adhesive

• One-paste

• Two-paste

A set of bonding adhesive

• Paste A

• Paste B

• Sealant A

• Sealant B

• Etching solution

Bonding procedure

• Clean the teeth

• Etch the teeth

• paint the sealant mixture

• paint the paste mixture

• place the brackets

Auxiliaries

• Ligatures:steel or elastic

• Elastic bands:1/8”, 3/16”, 1/4”, 5/16”

• Elastic chains:close, open, wide

• The others:expansion screw, headgear, etc.

Typical treatment procedure

• Aligning and leveling

• Space closure and correction of occlusal relationship

• Finishing

• Retention