a) Undermining
b) Indirect
c) Frontal
d) Necrotic
The correct answer is C. Frontal.
Application of light orthodontic forces will result in frontal/ direct resorption. Frontal resorption occurs only when the forces applied are close to the capillary pressure, i.e. 20 -26 gm/ sq. cm of root surface area.
Oppenheim and Schwarz have been given credit for discovering the optimum orthodontic force levels usually light continuous forces are recommended for tooth movement.
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