Classification Of Orthodontic Brackets Explained
Write short notes on orthodontic brackets.
Answer. These are passive parts of fixed orthodontic appliances.
- They act as handles so transmit the force from the active components to teeth.
- Brackets have one or more slots that accept the wires.
Classification of Brackets
Based On Slot Type
- Ribbon arch Brackets
- Brackets have vertical slots facing occlusal or gingival direction.
- Used with round wire
- Used in Begg fied appliance.
- They bring the tipping of teeth in labiolingual or mesiodistal direction.
- Edgewise type of Brackets
- They have horizontal or rectangular slot
- Used in straight wire and edgewise technique
- They provide more control over tooth movement and permit the tipping of teeth.
According to the Mode of Attachment to the Tooth
- Weldable Brackets
- Brackets are welded or soldered over bands.
- These brackets have a metal flange that can be welded to the band.
- Bondable Brackets
- Brackets that are bonded directly over the enamel.
- The undersurface of bondable brackets has a meshwork or groove.
Based on Material
- Metallic brackets:
- Most commonly used
- Made by steel
- Can be recycled, sterilized, and not expensive.
- They resist deformation and fracture.
- Aesthetically unpleasing and may corrode.
- Ceramic brackets:
- Made of aluminum oxide or zirconium oxide.
- Dimensionally stable.
- Durable, resistant, staining in oral environment.
- Disadvantage: They are very brittle, fracture or crack under undue forces.
- Plastic brackets:
- Made by polycarbonate
- Esthetic-tooth color or transparent.
- Disadvantage: Tend to discolor.
- Poor dimensional stability: Friction between plastic brackets and metal arch wire is very high.
Leave a Reply