Back to main page Class II
division 1 malocclusion: Buck teeth
The ruler
without numbers 12-year-old males
The
tracing of a patient's head X-ray
SEE BELOW:
TREATMENT OF CLASS II DIVISION 1 MALOCCLUSION (BUCK TEETH) WHEN THE LOWER JAW IS
"RETROGNATHIC":
THE FORCUS ORTHPEDIC APPLIANCE TO PROMOTE LOWER JAW ADVANCEMENT/GROWTH"
DOWNLOAD ONE RULER WITHOUT NUMBERS: THE "COMPOSITE NORM" OF 12-YEAR-OLD MALES
Below: The tracing of a patient's lateral
head X-ray: The outline of the soft-tissue facial profile is not required by the
"mathematical" model of the skull. I have drawn it in to assist the viewer to
orient themselves. In addition, in the original dissertation study the "calotte"
(the very top part of the cranium had to be interpolated since it was absent in
all lateral head X-rays.
Class II Div 1 Overjet (Lip
Procumbency)
YouTube animation showing correction from Class II to Class I
(normal)
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"The ruler
without numbers"
Composite
Standard (Norm): Males Age12-years-old (standards were also
created for males age 10 and 12, and females age 10,12 and 14
How to use the
ruler:
Place the
patient's tracing over the composite-Standard by placing the "X" on the
"X" of the standard and make the planes of the tracing and the standard
parallel to each other. (Alternative positioning methods are used to
detect and evaluate a variety of dimensional and positional
deviations from the norm.)
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Positioning strategies for
overlaying the patient's skull tracing on the Composite Standard:
 Depth:18%
459x Height: 24% 800 |
| Standard Position : (Tracing centered on
the "X") In comparison to the normal male age 12: Fritz's mid-face
is not overgrown. His lower jaw is rotated "down and back" compared to
the average 12-year-old. Were his lower jaw in a more normal
position is facial height would be at the high limit of normal. The
length of his "cranial base" is much shorter than then the normal
sample. ("X" to the nose) His upper front teeth lean forward but not
drastically. His back molars are positioned very similarly to the normal
sample of 12-yer-old males. His lower teeth lean forward moderately. His
back molars are positioned more back than the normal sample and that is
because his jaw is rotated down and back. Treatment: a device to
reposition has jaw forward (encourage his jaw to accept a new more
forward position. Plan: use of a fixed "orthopedic" device. The
recommended device among others is a "Forcus" lower jaw anterior
repositioning appliance. Treatment time 12-18 months to take advantage
of the fact of jaw growth during the adolescent pubertal growth spurt.
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 Depth:18%
459x Height: 24% 800 |
| Center tracing on bridge of nose: If you
take the nose point to be normally positioned you would be forced to
conclude that the mid-face is excessively forward in relation to the
normal sample and that the mandible is in its normal position.
Othodontists believe that the variation (excessively larger or small) is
rarely seen in the "anterior cranial base" |
 Depth:18%
459x Height: 24% 800 |
| Tracing centered on Point "Gonion (where
the vertical part of the back off the lower jaw meets the horizontal
part) "to measures "Length" : the length of the lower border of the
lower jaw. The length of Fritz's lower jaw is "spot-on". |
 Depth:18%
459x Height: 24% 800 |
| Tracing centered on the back margin of
the lower jaw to measure "Angle" of the of Mandible which orthodontists
describe as "obtuse" or "acute" Lower jaws that are obtuse are
frequently associated with deep overbites which is Fritz's condition.
Lower jaws showing and acute angle are often associated with "open
bites" Clinically when you look at Fritz you would conclude that he has
a pushed back lower jaw in relation to a normal looking mid-facial
skeleton. Conclusion: Fritz
presents with a Class II division 1 malocclusion. It is a result of the
lower jaw having grown down and back in comparison to normal 12-year-old
males/ males. The mid-face is not overgrown in comparison to the
normal sample of 12-year-old males. The treatment is to promote growth
of the lower jaw. |
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TREATMENT OF CLASS II
DIVISION 1 MALOCCLUSION (BUCK TEETH) WHEN THE LOWER JAW IS "RETROGNATHIC"
CASE IN POINT: FRITZ
MONTGOMERY (SEE ANALYSIS ABOVE)
THE "FORCUS" ORTHOPEDIC
APPLIANCE (3M-UNITEK
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| Right side view Forcus
Orthopedic placed and activated: The appliance exerts a constant
forward force on the lower. Here you see the lower jaw in its
corrected position. |
Front view |
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Front view of the activated
Forcus in place |
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Right side view of
the activated Forcus in place |
Left side view of the
activated Forcus in place |
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