Cephalometric Analysis for Orthognathic Surgery
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Transcript of Cephalometric Analysis for Orthognathic Surgery
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CEPHALOMETRIC ANALYSIS FOR ORTHOGNATHIC SURGERY
Dr. Mohd Ullah KhanDept of Othodontics & Dentofacial OrthopedicsCIDS
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CONTENTS
INTRODUCTION CHARACTERISTICS LANDMARKS CHARLES.J.BURSTONE ANALYSIS CONCLUSION REFERENCES
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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
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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.
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LANDMARKS
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Sella (S)
CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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Nasion (N) –
CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
9Articulare (Ar)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
10 Pterygomaxillary fissure (PTM)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
11
Subspinale (A) –
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
12 Pogonion (Pog)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
13Supramentale (B)-
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
14 Anterior nasal spine (ANS) –
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
15Menton (Me) –
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
16
Gnathion (Gn)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
17 Posterior Nasal Spine (PNS)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
18 Mandibular plane (MP) –
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
19 Nasal Floor (NF)
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
20 Gonion (Go)
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7HP
Horizontal plane
CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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Hard tissue analysis Cranial base Horizontal profile Vertical height - dental & skeletal Maxilla & mandible Dental
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Cranial base
1. Ar-N (||HP)
2. Ar-Ptm (||
HP)
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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
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HORIZONTAL PROFILE
1.N-A-Pog(Angle)2. N-A(|| HP)3. N-B(|| HP)4. N-Pog(|| HP)
CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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N-A-Pog (F)2.6° + 5.1° (M)3.9° + 6.4°
N
A
Pog
• Degree of skeletal convexity.
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.
N-A(||HP) (in mm)(F) -2 + 3.7(M) 0 + 3.7
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.
N-B(||HP) (in mm) (F) -6.9 + 4.3 (M) -5.3 + 6.7
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..
N-Pog(||HP) (in mm)(F) -6.5 + 5.1(M) -4.3 + 8.5
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VERTICAL HEIGHT - SKELETAL
Vertical Skeletal &
Dental
Anterior
N-ANS ANS-Gn
posterior
PNS-N MP-HP
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
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HP
ANS
NN-ANS ( in mm) (F) 50 + 2.4 (M) 54.7 + 3.2
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HP
Gn
ANS
ANS-Gn (in mm) (F) 61.3 + 3.3 (M) 68.6 + 3.8
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HP
PNS
N PNS-N (F) 50.6 + 2.2 (M) 53.9 + 1.7
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HP NMP-HP angle (F) 24.2° + 5° (M) 23.0° + 5.9°
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
35 VERTICAL HEIGHT - DENTAL
Vertical dental
dysplasia
Ant
U1-NF L1-MP
post
U6-NF L6-MP
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HP N U1-NF (in mm) (F) 27.5 + 1.7 (M) 30.5 + 2.1
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HP N l1-MP (in mm) (F) 40.8 + 1.8 (M) 45.0 + 2.1
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HP N U6-NF (in mm) (F) 23.0 + 1.3 (M) 26.2 + 2.0
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HP N L6-MP (in mm) (F) 32.1 + 1.9 (M)35.8 + 2.6
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
40 MAXILLA & MANDIBLE
PNS-ANS (||HP) Ar-Go Go-Pog B-Pog (||MP) Ar-Go-Gn (°)
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HP N PNS-ANS(in mm) (F)52.6 + 3.5 (M)57.7 + 2.5
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Ar-Go (in mm) (F) 46.8 + 2.5 (M) 52.0 + 4.2
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B-Pog (in mm) (F) 7.2 + 1.9 (M) 8.9 + 1.7
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Ar-Go-Gn (in °) (F) 122°+ 6.9° (M) 119.1° + 6.5°
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May 1, 2023CHARLES J BURSTONE,J ORAL SURGERY...VOL 36,APRIL 1978
45 DENTAL
OP-HP (angle) A-B(||0P) U1-NF (angle) L1-MP (angle)
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OP-HP angle
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HP NOP-HP angle (F) 7.1 + 2.5 (M) 6.2 + 5.1
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HP N A-B(||0P) (in mm) (F) -0.4 + 2.5 (M) -1.1 + 2
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HP NU1-NF angle (F) 112° + 5.3 (M) 111° + 4.7
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HP N L1-MP angle (F) 95.9° + 9.7 (M) 95.9° + 5.2
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SOFT TISSUE Landmarks used for the analysis
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GLABELLA
GLABELLA
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COLUMELLA POINT
COLUMELLA POINT
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SUBNASALE
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LABRALE SUPERIUS
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STOMION SUPERIUS
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LABRALE INFERIUS
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STOMION INFERIUS
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SOFT TISSUE POGONION
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SOFT TISSUE MENTON
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CERVICAL POINT
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SOFT TISSUE GNATHION
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Horizontal analysis of the soft tissue profile
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Facial Form Angle of convexity G to Sn and Sn to Pog Mean Value is 12 degree with a
standard deviation of 4 degree
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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
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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.
.
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1. Height of the mid third of the face/ height of the lower third ( A / B)
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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
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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.
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A-P Lip PositionLine drawn from Subnasale to soft tissue Pog to Ls 3mm
Line drawn from Subnasale to soft tissue Pog to Li 2mm
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Labiomental sulcus
Sulcus perp to Li-Pog
4 mm normal
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MAXILLARY INCISORS EXPOSURE
2mm is desirable.
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INTERLABIAL GAP
Lightly touching to approximately 2mm apart.
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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
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REFERENCES
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