4. INTRODUCTION
Developed in University of connecticut
The successful t/t of orthognathic surgical pt is dependent of careful diagnosis.
This system describes H and V position of facial bones
Size of bone—linear measurement
Shape ----angular measurements
5. CHARACTERISTICS
1. The chosen landmarks and measurements can be altered by various
surgical procedures.
2. The comprehensive appraisal includes all of the facial bones and a cranial
base reference.
3. Measurements can be readily transferred to a study cast for mock surgery.
4. Critical facial skeletal components are examined.
5. For variations in age and sex standards are available.
6. Computerized systematic approach to measurement can be used.
24. Ar-PTM
Ar-N
Ar-N(||HP)
(in mm)
(F) 50 +3
(M) 52.8 + 4.1
Ar-Ptm(||HP)
(in mm)
(F) 32.8 +1.9
(M) 37.1 + 2.8
Ar-PTM is measured to determine horizontal distance b/w post aspect of maxilla
and mand.. Greater the distance bt Ar-ptm mandible placed post to maxilla
64. Facial Form
Angle of convexity
G to Sn and Sn to Pog
Mean Value is 12 degree with a
standard deviation of 4 degree
65.
66. So to define the anterior posterior position
of the jaws two soft tissue measures are
taken.
Sn point to G perp
: 6 +/- 3 mm
Pog’ point to G
perp : 0 +/- 4
mmm
67. Lower cervicofacial angle
Formed by the
intersection of Sn –
Gn’ and Gn’ – C lines.
Mean Value is 100
degree with a SD of 7
degree.
.
68. 1. Height of the mid third of the face/
height of the lower third ( A / B)
69. Height of the lower third of the face increases in :
a) Maxillary vertical over growth
b) Class 3 patients with vertical height increase
c) Skeletal open bites
Height of the lower third of the face decreases in :
a) Maxillary Vertical undergrowth
b) Mandibular retrusion with deep bite
c) Vertical undergrowth of the chin
70. Nasolabial Angle
Formed by the intersection
of lines Cl-Sn and Sn-Ls.
Mean Value is 102 degree
with a standard deviation of
8 degree.
71. A-P Lip Position
Line drawn from Subnasale to soft tissue
Pog to Ls 3mm
Line drawn from Subnasale to soft tissue
Pog to Li 2mm
75. CONCLUSION
• A simplified and relevant ceph analysis has been developed that is
applicable to planning tt for pt requiring orthognathic surgeries.
• This analysis evaluates both hard tissue and soft tissue with both
vertical as well as horizontal aspects of the face.
• If a prime pbjective of orthognathic surgery is facial improvement,
soft tissue analysis becomes paramount in treatment planning