Original scientific paper
A Comparative Analysis of the Mandibular Cinematically Determinated Hinge Axis and the Referent Hobo’s Point
Stanislav Vukovojac
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Davor Seifert
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Abstract
On a sample of 48 patients terminal hinge axis has been determined
by use of Lauritzen’s technique. Terminal hinge axis point has been marked on the leftside of face of each patient with a metal pellet 0.5 mm in diameter. Hobo point has been measured and marked on the same side of face, for each patient, with a metal pellet 1.0 mm in diameter. Standard cephalometric roentgenogram was obtained for each patient. Cephalograms were traced on a transparent foil and points Porion, Orbitale, Hobo and terminal hinge Axis point (THA) have been marked. By connecting points Porion and Orbitale, Frankfort horizontal has been lined on each cephalogram. Distances between points Hobo and THA, as well as between Frankfort horizontal and. point THA have been measured. Measured values have been statistically evaluated. Results show that 68% of points Hobo are in diameter o f 5.0 mm from point THA. Accordingly to results point Hobo is equally usable for facebow mounting o f casts as well as any other arbitrary point. Mean value of distance between THA point and Frankfort horizontal in this investigation is 4.08 mm. Great standard deviation and coefficient of variation for both variables pointed out that each patient must be individually evaluated and treated.
Keywords
terminal hinge axis; Hobo’s point
Hrčak ID:
100762
URI
Publication date:
15.9.1992.
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