Facebow Flashcards
Schallhorn 1957
- Recorded arbitrary and true hinge in 70 dental students
- Concluded that in 95% of subjects what about the kinematic center?
95% of subjects - kinematic center lies within the 5 mm radius (WNL) - determining kinetic center not necessary
Lauritzen & Bodner 1961
Marked hinge & arbitrary hinge axis by 3 methods
Concluded what?
67% of cases the true hinge axis was 5 to 13 mm away from arbitrary located hinge
Weinberg 1961
Deviation from hinge axis of 5 mm results in what?
Anteroposterior displacement error of 0.2 mm at second molar
Frankfort horizontal plane is what to what?
This plane is located how many mm away from orbitale?
Infraorbital rim to porion
Orbitale minus 7 mm
Camper’s Plane is what to what?
Ala of nose to tragus of ear
Gysi’s point?
13 mm anterior of the external auditory meatus on a line from upper margin of ear’s meatus to outer canthus of eye
(Slightly different than Beyron’s - which is along the central aspect of ear’s meatus. So Gysi is higher.)
Beyron’s Point?
13 mm anterior to the posterior margin of the tragus on a line from center of tragus to outer canthus of eye
(Slightly different than gysi)
Bergstrom’s Point?
10 mm anterior to center of spherical inserts of the Bergstrom face bow of the external auditory meatus and 7 mm below Frnakfort horizontal plane
Simpson’s Point?
10 mm anterior from tragus on Camper’s Plane
Anterior Reference Points:
P43 aka Denar Reference Plane (Guichet)
A point 43 mm superior from lower border of upper lip
Nasion Minus 23mm
- Located approximately __ mm above orbitale
Used with what company’s face bow?
Approx 25 mm
Whipmix and maybe also Artex
What reference plane does the Artex face bow use?
What anterior point?
Guichet’s mid facial horizontal reference plane.
Guichet’s p43 - 43 mm cranial to incisal point.
Schallhorn
Teteruck & Lundeen
Zuckerman
Schallhorn - 98% of arbitrary axis within 5 mm
T&L: Only 33% of arbitrary within 6 mm and 56% of ear bow within 6 mm
Zuckerman:
