The human mandible lower jaw is attached to the temporomandi

The human mandible (lower jaw) is attached to the temporomandibular Joint (TMJ). The masseter muscle is largely responsible for pulling the mandible u? Ward when you are talking or eating. It is attached at a horizontal distance of about 2.5 cm from the TMJ. If this muscle exerts a force of 222 N when you bite, what is the force your incisors exert? The horizontal distance from the TMJ to your incisors is 6.6 cm. Assume that both forces are vertical.

Solution

The forces are parallel and perpendicular to the hirozontal distance form TMJ.

Apply Principle of moment:

F1r1 = F2r2

Thus, the force exert by incisors is,

F2 = F1r1/r2 = (222 N)(2.5 cm) / 6.6 cm = 84.09 N

The direction of clockwise.