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Related to mandibular arch: hyoid arch
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Before taking the pre-operative impression, the assistant decides if a triple tray impression can be used for the crown and bridge procedure being performed on the patient, or if instead two separate maxillary and mandibular arch impressions should be made.
Black's material from 1902, Nance learned that the mandibular arch average excess amount was 3.
The assistant typically aims to have the patient's incisal edges bite dose to the anterior edge of the film holder, since this will allow the plane containing the film to be placed as far posteriorly as possible, which tends to put it out of contact with the lingual aspect of the mandibular arch or mandibular tori.