. The principles and practice of roentgenological technique . made in the hori-zontal or sitting posture. The former ispreferable, since it is more conducive tocomplete immobilization, ^^hen madein the sitting posture, a dental chair oran ordinary chair fitted with head rest andclamps may be used. The dental chairshould be provided with every range ofmovement and adjustment and with ahead rest which is detachable and adjust-able. The head is placed in the proper po-sition for examination b_v reference tothree base lines (Fig. 221). 1. The in-fraorbital auricular line is one which ex-tends frpm
. The principles and practice of roentgenological technique . made in the hori-zontal or sitting posture. The former ispreferable, since it is more conducive tocomplete immobilization, ^^hen madein the sitting posture, a dental chair oran ordinary chair fitted with head rest andclamps may be used. The dental chairshould be provided with every range ofmovement and adjustment and with ahead rest which is detachable and adjust-able. The head is placed in the proper po-sition for examination b_v reference tothree base lines (Fig. 221). 1. The in-fraorbital auricular line is one which ex-tends frpm the lower border of the orbitto the external auditory meatus. In ex-aminations of the teeth of the upper jawand in the molar teeth of the lower jawin the vertical posture, this line must behorizontal. 2. The labial auricular lineis one which extends from the angle ofthe mouth to the external auditorymeatus. In the examination of the teethof the lower jaw in the vertical postiu-ethis line must be horizontal. 3. The su-l)raorbital auricular line. This should. k Fig. 221.—Base lines. •^^S|^Oj^ ^^^^£^HL 3^^^^^ ..m^^*- i. ^HBAJ^AI^ i h ^^■hH^^p ^ If « :>-li ^ V -^ - ^^Ujkj:^^. \ ^V^^^^^^H^K^^ i K•^ ^ 5 i^ H Fig 223 156 TEETH
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
