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To show the posterior occlusion directly, use the smaller single cheek retractor to retract the corner of the mouth as posterior as possible. For better exposure, ask the patient to hold a mouth mirror lightly at the other corner of the mouth. The camera should be also positioned posteriorly with focus on the region between the canine (mainly) and the 1st molar (as compared to Fig.7).
Xin Wei, DDS, PhD, MS 1st edition 09/27/2016, last revision 09/27/2016