Transcript Fixed appliances

Fixed appliances
Development of orthodontics
in china
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Removable
Begg
Edgewise
Straightwire (pre-adjusted)
Bracket
• Metal
• Ceramic
• Plastic
Disadvantages of ceramic
brackets
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The bond is too strong
Brittle
Too hard
High friction
Band
• (1) Buccal and often lingual attachments
are soldered or welded.
• (2) Piror to placement of a band it may be
necessary to separate the adjacent tooth
contacts.
• (3) There are different sizes of bands for
different sizes of molar.
• (4) Glass ionomer cement is used for band
cementation.
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
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Paste A
Paste B
Sealant A
Sealant B
Etching solution
Bonding procedure
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Clean the teeth
Etch the teeth
paint the sealant mixture
paint the paste mixture
place the brackets
Auxiliaries
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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