Laterally from the midline in either jaw, we have eight teeth: two incisors, one canine, two bicuspids (or premolars), and three molars (the last molar being a wisdom tooth). The lateral distances fronm the mandibular joint to the insertion of the masseter muscles, the first bicuspids, and the central incisors, are 0 4L, L. and 1.2L, respectively. (a) What type of lever is involved in biting and chewing with the masseter muscles? (b) For biting in equilibrium with a masseter muscle force of 1,625 N, show that the fo on the first bicuspid of 650 N, assuming there is no force on the central incisors [67]. Draw a force diagram for this. (c) Under these conditions, show that the needed counter force on the central 540 N, now assuming no force on the first bicuspid. Draw a force diagram fo
Laterally from the midline in either jaw, we have eight teeth: two incisors, one canine, two bicuspids (or premolars), and three molars (the last molar being a wisdom tooth). The lateral distances fronm the mandibular joint to the insertion of the masseter muscles, the first bicuspids, and the central incisors, are 0 4L, L. and 1.2L, respectively. (a) What type of lever is involved in biting and chewing with the masseter muscles? (b) For biting in equilibrium with a masseter muscle force of 1,625 N, show that the fo on the first bicuspid of 650 N, assuming there is no force on the central incisors [67]. Draw a force diagram for this. (c) Under these conditions, show that the needed counter force on the central 540 N, now assuming no force on the first bicuspid. Draw a force diagram fo
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