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Terminal Hinge Axis – Hobo Point – Frankfurt Horizontal Relations
D. Seifert
V. Jerolimov
V. Carek
Sažetak
Aim of this investigation was to determine the spatial relations of the terminal hinge
axis of the temporomandibular joints toward Frankfurt horizontal. The sample consisted
of 50 examinees. Terminal hinge axis was located, using Lauritzen’s technique, on
the left side of face for each examinee. Arbitrary point, as proposed by Sumiya Hobo,
was measured and point Orbital was defined by palpation. On designated points steel
pellets 0.25 mm in diameter were stocked. Lathero – latheral cephalogram was obtained
for each examinee. Cephalograms were traced down on a transparent foil and points
Orbital, THA – terminal hinge axis, Hobo and Porion – as the uppermost point of the
metal ear rod of the cephalostat, were designated. Connecting points Orbital and Porion,
Frankfurt horizontal was defined, and shortest distance toward points THA and
Hobo, as well as between them were measured. Lines parallel and perpendicular to
Frankfurt horizontal were drawn through point THA. In a co-ordinate system defined
in such a way, upper left quadrant was first, upper right second, lower right third, and
lower left was fourth. Observation was made in which quadrant Hobo point was located.
Measured values were statistically evaluated. Results revealed that Hobo point is
located in first quadrant in 5 cases, in second in 7, third quadrant in 18, and in fourth
in 20 cases. That means that Hobo point is located lower to the THA point in majority of
our population. Points THA and Hobo were not identical in any case. Mean values of
variables showed that investigated points were inferior to the FH. Measures of variability
revealed great variability of both points toward FH, as well as for their mutual distance.
It could be pointed out that THA point should be defined kinematically during
prosthodontic procedures, and that orientation in articulator’s space should not be according
to the FH.
Ključne riječi
Hrčak ID:
17217
URI
Datum izdavanja:
16.12.2000.
Posjeta: 2.356 *