DDS, MS, PhD DDS, MD · Three Dimensional Quantification of Post-Surgical Condylar Displacement...
Transcript of DDS, MS, PhD DDS, MD · Three Dimensional Quantification of Post-Surgical Condylar Displacement...
Three Dimensional Quantification of
Post-Surgical Condylar Displacement
PAULA ZABALEGUIDan Grauer DDS, MS, PhD & Michael Gunson DDS, MD
Thomas M. Graber Award of Special Merit
P U R P O S E O F O U R S T U D Y
To measure, in three dimensions,
translation and rotation movements
of the condyle after orthognathic
surgery
M AT E R I A L S
17 Consecutive Patients [10M, 7F]
Skeletal Class II Or Class III Malocclusion
Pre-surgical Orthodontic Treatment + Bi-maxillary Surgery (Same Oral
Surgeon)
Maxillary Le Fort I Osteotomy & BSSO
Rigid Fixation (Plates)
Full head CBCT scans, pre surgery and 2 weeks after surgery
M E T H O D
1) Segment the Region of Interest: condyles and fossae, pre and
post surgical
2) Export as separate surfaces
3) Superimpose on Glenoid Fossa
4) Measure condylar displacement:
Translation (mm): x,y,z
Rotation (degrees): x,y,z
1. Segment the Region of Interest
2. Export as Separate Surfaces
3. Superimpose on Glenoid Fossae
4. Measure Condylar Displacement from PreSurgical (Blue) to Post Surgical (Red)
0,00
1,00
2,00
3,00
4,00
x y z
0
4
10.15
-3.80
0.78
AVERAGE CONDYLAR TRANSLATION (MM)
-3.80
0.78
0.15
R E S U LT S
-0.30
0.63
-0.27
AVERAGE CONDYLAR ROTATION (º)
0,00
1,00
x y z
000
0,063
0,3070,277
R E S U LT S
D I S C U S S I O N
T R A N S L A T I O N Y ( A N T E R O P O S T E R I O R )
What i s th i s k ind o f
movement due to?
What i s th i s k ind o f
movement due to?
D I S C U S S I O N
A N T E R O P O S T E R I O R R O T A T I O N
What i s th i s k ind o f
movement due to?
D I S C U S S I O N
M E D I O L A T E R A L R O T A T I O N
Why d i d n ’ t w e f i n d t h e s e k i n d s o f
m o v e m e n t s ?
D I S C U S S I O N
M E D I A L A N D S U P E R I O R M O V E M E N T
C A S E P R E S E N TAT I O N
B l u e = b e f o r e s u r g e r y R e d = a f t e r s u r g e r y
C O N C LU S I O N S
1. A method to measure Condylar Displacement in 3 planes of space
was established, both for rotation and translation
2. Posterior displacement
3. Anteroposterior Rotation
4. MedioLateral Rotation
5. Surgical stability
Advanced Orthodontic Program :
University of Southern Cali fornia
Dr. Dan Grauer
Dr. Michael Gunson
A C K N O W L E D G E M E N T S