Facial asymmetry in orthodontics / fixed orthodontics courses india

y is in the eye of the be
www.indiandentalacademy.com

Concept development.
Intellectual progress.
Social awareness
&interaction.

Rickett’s 1982 AJOwww.indiandentalacademy.com

Genetic or Congenital

Crouzon syndrome
Hypoplastic maxilla
Shallow orbits
Proptosis
Hypertelorism
Parrot like nose
craniosynostosis

Asymmetric Cranium

Induced

Pressure Through Birth Canal

Facial Hemihypertrophy
Hormonal imbalance.
Incomplete twinning.
Chromosomal
abnormalities.
Alteration of intra uterine
development.
Lymphatic abnormalities.
Vascular abnormalities.
Neurogenic
abnmormalities.

Enlargement of one side of face.
Dentition shows abnormalities in
respect to 1)Crown size 2)Root size
3)Rate of development.
Tongue shows unilateral enlargement,
contralateral displacement.

Environmental (Habits or Trauma)

Functional Deviations
(Maxillary Constriction or Tooth Interference)

Muscular Dysfunction
Congenital.
Paralyses.
Myopathies.
Hypertrophies.

Muscle Dysfunction
Loss of part of musculature(unknown
cause or birth injury or damage to the
motor nerve).

Muscle Weakness
Muscular
dystrophy.
Cerebral palsy.
Muscle weakness
syndromes.

Extraoral examination
Presence of canted occlusal
plane.
Maxilla or temporal bone
supporting the glenoid fossa
could be at different levels.

Three dimensional imaging-CWRU
METHOD

Cephs are scanned.
Allows the operator to scale the images
based on the offset distance.

Dental impressions are scanned to
create emodel digital orthodontic
model

3D surface images are
obtained by merging
series of views taken with
laser scanner.
The colour texture image
is aligned by parallex and
captured for later
alignment with image.
All views merged
In 3dceph.dto it is
possible to locate facial
landmarks and record
location in 3d.

Three Dimensional Morphometrics
Vertical stripe pattern
Image capture of this
stripe pattern by six black
and white CCD devices
The lines used to align
these six images.
Colour lens provides
colour texture.

Methods of Three Dimensional
Facial Imaging
Laser scanners.
Distortion of the laser
pattern on to the 3D
object and infer
surface characteristics
by the type of
distortion to provide a
surface map

Grid projection technique
Either (grid) shadow or
(visible or laser) light is
projected onto the skin
and then this (distorted)
projection is captured
photographically for facial
reconstruction

Structured Light
In SL the scene is illuminated by a light pattern
and only one image is acquired .The captured
image is compared to the light projection plane to
extract co ordinates.

Computed Tomography Scans

Integrated Three Dimensional
Craniofacial Imaging
Generating3 D
digital models of
upper and lower
teeth and creating
tie point bearers.
Placing Facial tie
points
Generating a 3 d
photographic model
of face
Generating 3 D Xray
model of the teeth
,face and skull

Merging the several 3D models
Viewing the integrated 3-d model

Mesh Analysis of Facial
Asymmetry
Simultaneous illustration of the vertical
and horizontal location of landmarks in its
coordinate system J acobsosn

Digigraph 3-d Analysis
Mark Lemschen and Gary Engel
Computer, monitor, keyboard
,video camera ,sonic digitizing
probewith receptor microphones
and a patient sit with head
holder
Any point can be located in 3
planes

Anatomic reconstruction
Knowledge of spatial
relationships between
sensor ,source and the
imaged anatomy with 7
degrees of freedom
creates the ability to
combine multiple images
into a 3d database for
future analytical and
reconstruction procedures.

Orthocad

Abhaywww.indiandentalacademy.com

Buccal occlusion asymmetry
Logical to achieve correction with
asymmetric head gear.

Treatment in
Preadolescents
If surgery is done should always be
followed by functional therapy.

Facial asymmetry at age of 27 due to
a fractured condyle at 7 yrs.
Harvolwww.indiandentalacademy.com

The required strain is established when
musculature controls position of the jaw
in the desired symmetric relation to the
maxilla which provides space for
condylar process to be developed.

Bone graft serves three purposes
1)It prevents formation of fiberous tissue
2)It conducts strain distribution
3)It provides cell material for new bone.

When strain system has been active for
three to four months ,new bone formation
can be recognized on the x-ray.

Distraction Osteogenesis as a
Treatment Modality?
Principle.

IS IT REALLY
APPLICABLE IN
DEVELOPMENTA
L ANOMALIES?

RENUKA

VANI

PRE POST

CONCLUSION
If there is a defect on
the soul, it cannot be
corrected on the face,
but if there is a defect
on the face and one
corrects it, can correct a
soul. www.indiandentalacademy.com

Discussionwww.indiandentalacademy.com

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