fixed appliances
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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