Question 208 · LDEK · Biomechanics and tissue response to treatment
Choose false sentences regarding the friction force, which occurs during ortho treatment:
- A. it is determine by two factors: coefficient of friction and contact force.
- B. coefficient of friction is permanent for each material, and can by changed by the impact of the environment.
- C. contact force consist of the force of contact of both surfaces, plus ligating strength, stiffness of the wire and the size of the bracket’s slot.
- D. for reduction of friction during ortho treatment, rigid arch wires with smooth surfaces and large diameter should be used.
- E. friction during ortho treatment can be reduced by using ligatures of low coefficient of friction and self-litigating brackets.
Hint
Friction equals coefficient times normal force; ask whether a thick, stiff wire filling the slot raises or lowers the normal force and binding.
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