Fixed Appliances

Question 1

Indications for fixed appliances?

Answer 1

• Bodily movement
• Rotations
• Multiple teeth movement simultaneously
• Active closure of extraction spaces due to hypodontia
• Intrusion and extrusion of teeth

Question 2

Components of Fixed appliances?

Answer 2

• Bands - rings encircling teeth usually molar teeth cemented with GIC
• Bonds - brackets are bonded onto teeth
• Brackets and bands have horizontal slot where arch wire is placed
• Auxillaries - elastomeric modules or wire ligatures secure arch wire into the slot

Question 3

How is the type of force applied determined using arch wire?

Answer 3

• Amount and type of force applied can be controlled by varying the cross-sectional diameter and form of the arch wire or material
• nickel titanium wire more flexible than stainless steel and has greater resistance to deformation - good for alignment of teeth
• stainless steel good for levelling curve of spee
• stainless steel rectangular wire also good for OJ reduction or correction of incisor relationship and space closure as you have 3D control with the help of springs and elastics