movement of the cervical spine in the sagittal plane was studied in ten normal subjects from 20 to 30 years of age without and with four different cervical orthoses : ( 1 ) polyethylene camp plastic collar with chin and occiput piece , ( 2 ) plastizote philadelphia collar , ( 3 ) four-poster and ( 4 ) somi ( sternal occipital mandibular immobilization ) .
C0008114
chin
C0024687
mandibular