True anatomical porion is difficult to locate either due to superimposition of anatomical structures or because of Ear rod of cephalostat
superimposing the anatomical porion.
A portable cephalostat
was specifically confected for the present study and consisted of a metal structure with an acrylic part to which the ear rods were attached.
The radiographs should have been taken within the same standards--with patients positioned in the cephalostat
, the midsagittal plane perpendicular to the ground, the Frankfurt horizontal plane parallel to the ground, the film perpendicular to the ground, 1.
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Identificacion de variables de interes Articulo Doff et al 2010 (43) Grupo de tratamiento Thornton Adjustable Positioner (TAP[R]) Muestra basal (rango de 51 (49 + -10) edad en anos) Grado de AOS (IAH) No severa: n=25 Severa: n=26 Instrumento de medicion Cefalometria Lateral de Craneo Digital (ProMax Cephalostat
, Planmeca, Helsinki, Finland).
The mandibles were immersed in a Styrofoam box filled with water and positioned in the cephalostat
of the i-CAT[R] CBCT scanner (Imaging Sciences International, Hatfield, USA) simulating an in vivo position (i.
All radiographs were taken on the same cephalostat
with the patient in a standing position, with the Frankfurt plane parallel to the horizontal, the teeth in centric occlusion and lips relaxed.
Standard lateral cephalometric radiographs of the heads were obtained using standard cephalostat
A head stabilizing device called a cephalostat
is used to maintain a standard position and object-image distance so that serial radiographs can be more accurately compared.
More accurate quantitative information was derived from longitudinal experiments arising from the development of the Cephalostat
by Broadbent in 1931.
The cephalograms were taken with the subjects standing and the head positioned in the cephalostat
and orientated to the Frankfort horizontal plane with the teeth in maximum intercuspation.