Articulators

Question 1

Incisal Notches on Hanau Articulator

Answer 1

1st notch - 37mm
2nd notch - 51mm
Average distances from Orbitale to Maxillary incisal plane to use in place of facebow (Lauciello)

Question 2

FHP-7mm?

Answer 2

FHP is used as a reference plane because it was found to best parallel the axis-orbital plane. Gonzales and Kingery found by using cephalometrics that FHP-7mm better approximated axis-orbital plane. Hanau articulator take this into account by raising the orbitale indicator 7mm.

Question 3

Why use a facebow that estimates hinge axis?

Answer 3

An error of 5mm of the THA produces a negligible 0.2mm AP displacement of md molars (Weinberg)

Question 4

Facebow too high?

Answer 4

CG is reduced

Question 5

Effect of increased CG on protrusive cusp inclines?

Answer 5

No effect. Occlusal plane inclination compensates.

Question 6

Effect of increasing CG on working cusp inclines?

Answer 6

Due to Hanau formula. A change in CG would produce a very small change in the bennett angle (H/8+12)

Question 7

How will error in facebow affect occlusion?

Answer 7

If facebow is too high, CG will be reduced. If CG is reduced, the bennett angle will also be reduced, which will affect working and balancing cusp inclines