Soft tissue analysis 2 /certified fixed orthodontic courses by Indian dental academy

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Seminar
on
Soft tissue Cephalometric Analysis
INDIAN DENTAL ACADEMY
Leader in continuing dental education


CONTENTS

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2.
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HISTORY OF CEPHALOMETRICS
NEED FOR A SOFT TISSUE ANALYSIS
SOFT TISSUE CEPHALOMETRIC LANDMARKS
PR0FILE ANALYSIS
ANALYSIS OF THE LIPS
HOLDAWAYS ANALYSIS
RICKETTS ANALYSIS
STEINERS ANALYSIS
ANALYSIS FOR ORTHOGNATHIC SURGERY
ARNETTS ANALYSIS
CONCLUSION


HISTORY
Historically the human
form has been
measured for many
reasons. One has been
to aid humanity’s self
–potrayal in
sculpture,drawing and
painting. Another has
been to test the
relation of physique to
health, temperament,
and behavioural traits.


LEONARDO DA VINCI (16 century)

A scientific approach of human
craniofacial pattern was
probably initiated during the
renaissance period by the
accomplishment of Leonardo Da
Vinci
His paintings included a study of
facial proportions, where the
profile was divided into 8 parts
by 7 horizontal lines


DURER In his book FOUR
BOOKS OF FACIAL
PROPORTIONS Used
Geometric methods to study the
face .
He provided proportionate analysis of
Leptoproscopic (long ) face and
Euryproscopic (short) face .


CAMPER (18 th century)

Camper made an extensive
studies of cranium from
birth to old age. Campers’s
horizontal, a line
extending from middle of
porus aucustics to a point
below the nose became a
reference line used to
characterize evolutionary
trends in studies of facial
morphology and aging


EDMOND H WUERPEL - “ A face is beautiful and
shows harmonious features if the proportions of its
individual components are right ”

CALVIN CASE - “ A balanced profile should be one of
the key factors in deciding the method of treatment for any
form of malocclusion ”


Orthodontists have contributed to this
ongoing effort with their study of the
human face and profile, in search of
guidelines for the reconstruction of facial
dysmorphology and the correction of
malocclusion.


NEED FOR A SOFT TISSUE ANALYSIS
Model analysis
- was assumed to achieve all facial & dental goals
including facial harmony
-Experience shows that it was incomplete
-it reveals inter-jaw occlusal discrepancies but does
not indicate which jaw is abnormally placed
-model based Overjet correction may leave facial
imbalances uncorrected or even facial decline


Osseous cephalometric analysis
-It was assumed that by placing the skeletal parts
within the range of skeletal cephalometric norms,
facial balance could be achieved & the result
would be beauty
-Diagnosis of beauty by conventional osseous
cephalometric norms is unreliable
-It concentrates mainly on the measurement of hard
tissue structures, which are not consistently
related to soft tissues of face
-Hambleton in his article on the soft tissue covering
of the skeletal face, states that the facial curtain is
more than just the underlying bone, it is also
made up of muscles, fatty tissue, nerves, and
blood vessels.

Park and Burstone studied 30 cases in which the
lower incisor was 1.5 mm anterior to the A-Pog
line . This relationship is proposed by some
orthodontists as the key to an esthetic profile.
The profiles of these 30 patients were found to be
grossly different therefore casting doubt on the
reliability of the incisor-to-A-Pog line as a
reliable esthetic guideline.


When the cranial base is used as the reference line
to measure the facial profile, bogus findings can
be generated.
Michiels studied 27 nonorthodontic, Class I
patients to test the validity of various popular
cephalometric measurements used to predict
clinical profiles. His conclusions were that
(1) measurements involving cranial base
landmarks are inaccurate in defining the actual
clinical profile
(2) measurements involving intrajaw relationships
were slightly more accurate in reflecting the true
profile

(3) no measurement is 100% accurate

(4) the soft tissue thickness and axial inclination
of incisors are the most important variables in
inaccuracy
-When different cephalometric analysis are used for
the same patient conflicting diagnoses emerge
-Treatment based on cephalometric hard tissue
norms in many instances create undesirable facial
changes


Clinicians have begun to select treatment based on
direct facial examination and diagnosis.
Treating a face to “what looks beautiful” will
produce a beautiful facial result.
Models are analysed, the hard tissues are evaluated,
but the overriding key to treatment lies in
clinicians perception of the size, shape and
position of facial soft tissue parts
This kind of treatment planning focuses on where
esthetic problem truly exist.


SOFT TISSUE CEPHALOMETRIC
LANDMARKS
SOFT TISSUE NASION

PRONASALE
SUB NASALE
SUB SPINALE
LABRALE SUPERIUS
STOMION
LABRALE INFERIUS
SUB MENTALE
SOFT TISSUE POGONION
SKIN GNATHION


PROFILE ANALYSIS
PROPORTIONAL ANALYSIS
Ideal profile provides a basic standard for
assessment of average profile
Ideal profile ; Can be
divided into three equal parts
Frontal Third ( Tr- N )
Nasal Third (N - Sn )
Gnathic Third ( Sn – Gn )
ANTERIOR FACE CAN BE
PROPORTIONED ( N – Gn )
Midface - N To Sn - 45%
Lower Face – Sn To Gn -55%

ANGULAR PROFILE ANALYSIS ( SUBTENLY )

Subtently makes a distinction between skeletal soft tissue and full soft tissue
(including nose)
SKELETAL PROFILE ( N- POINT A - Pog ) AVG VALUE - 175O
Convexity decreases with age as skeletal form straightens with age.
b) SOFT TISSUE PROFILE ( NI – Sn – PogI ) AVG VALUE – 161O
Convexity does not change with age
c) FULL SOFT TISSUE ( NI – No – PogI ) AVG VALUE -137O (M) & 133O (F)
Convexity increases with age because of anterior growth of the nose.
Soft tissue changes are not analoges to skeletal profile changes.

SUBTENLYS PROFILE THICKNESS ANALYSIS
Soft tissue thickness at the Glabella remains constant
Thickness of Sulcus Labrale Superius increases by
approximately 5 mm
Thickness of Sulcus Labrale Inferius increases by
approximately 2 mm
According to Subtenly there is a greater increase in
maxillary than the mandibular soft tissue profile which
explains why the soft tissue grows more convex with age


BOWKER AND MEREDITH STUDIES ON SOFT TISSUE
THICKNESS


PROFILE ANALYSIS BY A.M. SCHWARZ (1929)


GNATHIC PROFILE FIELD

TANGENT T - Sn – Pog

T ANGLE OR PROFILE ANGLE
AVG -10 DEGREES


AVERAGE FACE - Sn on Pn

RETRO FACE

- Sn behind Pn

ANTE FACE - Sn ahead of Pn


STRAIGHT ANTE FACE
- Displacement of Pog
with Sn anteriorly
- GPF parallel and
anterior to
average face
STRAIGHT RETRO FACE
- Displacement of Pog
with Sn posteriorly
- GPF parallel and
posterior to
average face


OBLIQUE RETRO FACE – Posterior rotation of avg face. Maxilla
positioned posteriorly and mandible even more posteriorly
AVERAGE FACE ,GNATHIC PROFILE SLANTING BACKWARDS
- Backward
rotation of the profile is partly compensated by forward
displacement of Midface, therefore Sn avg position
RETROFACE GNATHIC PROFILE SLANTING BACKWARDCombined effect
of backward rotation and marked forward displacement of
the midface

OBLIQUE ANTE FACE- Forward rotation of average face, Maxilla is
anterior and mandible even more anterior.
AVERAGE FACE , GNATHIC PROFILE SLANTING FORWARD – Forward
rotation of profile is compensated by backward displacement of the midface,
Sn in average position
RETROFACE , GNATHIC PROFILE SLANTING FORWARD – Combined effect
of forward rotation and marked backward displacement of Midface


CLASS II MALOCCLUSION


CLASS III MALOCCLUSION


ANALYSIS OF THE LIPS


LENGTH OF UPPER LIP
MEAN VALUES
BURSTONE
Boys - 24 mm
Girls - 20 mm
RAKOSI
Boys - 22.5 mm
Girls - 20 mm
CLASS – II
CLASS – III


22

mm

20.9 mm

LENGTH OF LOWER LIP
MEAN VALUES
BURSTONE - Boys- 50 .0 mm
Girls- 46.5 mm
RAKOSI -

Boys- 45.5 mm
Girls- 40.0 mm

CLASS II - Retraction of upper
incisors - lower lip
curls up and moves
forward
CLASS III - Lingual tip of lower
Incisors - lip moves
backward

THICKNESS OF RED PART
OF UPPER LIP
AVERAGE SIZE
11.5 mm ( RAKOSI)
CLASS II : Upper lip thin due
to angulation of
upper incisors
CLASS III : Upper lip thicker as
It rests on lower
lip
DURING COURSE OF Rx:
CLASS II : Lip grows
thicker
CLASS III : Lip grows
thinner

THICKNESS OF RED PART OF
LOWER LIP
AVERAGE SIZE
12.5 mm ( RAKOSI )
CLASS II : Lower lip
is thicker ( 14 mm )
CLASS III : Lower lip is
thinner ( 11.9 mm )
DURING COURSE OF Rx:
CLASS II : Lower lip
becomes thinner
CLASS III : Lower lip
becomes thicker

HOLDAWAYS ANALYSIS
( 1983 )


FACIAL ANGLE AND UPPER LIP CURVATURE
FACIAL ANGLE is formed by the
intersection of FH PLANE
with line joining N TO POG
AVG VALUE -90 -92 DEGREES
Greater angle - Protrusive
lower jaw
Lesser angle - Retrusive
lower jaw
UPPER LIP CURVATURE
Reference line is drawn
tangent from FH PLANE TO
TIP OF UPPER LIP. Depth of upper
sulcus is measured.
AVG VALUE – 1.5 – 4.0 mm

H- LINE ANGLE AND SKELETAL CONVEXITY AT
POINT A
H line angle formed between
H-line and Line Joining N to
Pog
Avg Value- 7- 15 Degrees
Measures upper lip prominence
or retrognathism of the
Soft tissue chin
Skeletal convexity at point A
is measured from N-pog Line
to Point A
AVG VALUE - +2 TO -2 mm
Assess facial skeletal
Convexity relating to lip
Position

RELATIONSHIP BETWEEN H-LINE AND
SKELETAL CONVEXITY AT POINT A


NOSE TIP TO H-LINE AND UPPER SULCUS DEPTH

NOSE TIP TO H-LINE
AVG VALUE – 12 mm MAX

UPPER SULCUS DEPTH
MEASURED FROM SUB SPINALE TO HLINE
AVG VALUE- 5 mm


UPPER LIP THICKNESS AND UPPER LIP STRAIN
Upper lip thickness is measured
horizontally from a point 2 mm
below point A to outer border
of upper lip.
AVG VALUE - 15 mm
Upper lip strain is measured
from vermillion border of the
lip to the labial surface of the
Max central incisor
IF Upper lip thickness is greater
than the upper lip strain then it
indicates there Is strain in the
Upper lip.

LOWER SULCUS DEPTH AND SOFT TISSUE CHIN THICKNESS

Lower sulcus depth is
measured from the deepest
point in the curvature
between the Lower lip and
the chin and the h-line
AVG VALUE- 5 mm
Soft tissue thickness is
measured from hard tissue
Pogonion to soft tissue
Pogonion.
AVG VALUE- 10 TO 12 mm


ACCORDING TO HOLDAWAY
A PERFECT PROFILE SHOULD
HAVE
ANB - 2 degrees
H-LINE ANGLE -7 to 8 degrees
LOWER LIP should touch the
H line
H-LINE should bisect S curve
between Pronasale and
Subnasale
TIP OF THE NOSE - Should be
9mm anterior to h-line
there should be no lip strain
factor
( Upper Lip Strain =Upper Lip
Thickness )


RICKETTS LIP ANALYSIS
Reference line connects
NOSE TIP TO SOFT TISSUE
POGONION - E LINE
E Line

Lips are analysed
depending on the distance
of the lips from this line
NORMAL VALUES
UPPER : 2-3 mm
LOWER : 1-2 mm


STEINERS LIP ANALYSIS
Reference point is the
Centre of the S SHAPED CURVE
between the tip of Nose and Sub Nasale
Reference line extends from this point to
the SOFT TISSUE
POGONION
Lips behind this point are said to be flat
(RETRUSIVE)
Lips ahead of this line are said to be too
prominent
( PROTRUSIVE)

ANALYSIS FOR ORTHOGNATHIC
SURGERY


HORIZONTAL
PLANE

COLUMELLA

GNATHION

CERVICAL POINT


ANGLE OF FACIAL CONVEXITY

G TO Sn , Sn TO Pog
MEAN VALUE - 12 DEGREES
POSITIVE VALUE – CLASS II
NEGATIVE VALUE - CLASS III

LOWER FACE THROAT ANGLE

Sn to Gn , Gn to C
MEAN VALUE – 100 DEGREES
DECREASE IN VALUE INDICATES
PROMINENT CHIN


ANTERO POSTERIOR MAXILLARY AND MANDIBULAR
MEASUREMENTS
Dist. Sn to perendicular from Glabella - mean value 6 mm
Negative value - maxillary retrusion
Positive value – maxillary procumbency
Dist Pog to line- avg value 0mm


UPPER AND LOWER LIP
PROTRUSION

Sn
Ls
Li
Pog


Mean Values
Ls – Sn Pog

3 mm

Li – Sn Pog

2 mm

MENTO LABIAL SULCUS

Li
Sm
Pog


Mean Value- 4 mm

NASOLABIAL ANGLE

Mean Value - 102 degrees


VERTICAL LIP CHIN RATIO
Mean Value - 1:2
INTER LABIAL GAP
Mean Value - 2 mm
MAXILLARY INCISOR
EXPOSURE
Mean Value - 2 mm


ARNETTS ANALYSIS


Nineteen facial traits were selected
Two views of the patient are used for identification of problems in three
planes of space:
I. Frontal
A. Relaxed lip
B. Functional analysis
1. Closed lip
2. Smile
II. Profile
A. Relaxed lip


FRONTAL VIEW Outline form and symmetry

Facial height: Hairline (H) to soft
tissue menton (Me'). Facial
widths: Zygomatic arch (ZA) to
zygomatic arch (ZA), Gonion
(Gó) to gonion (Go')


Facial level

Pupil plane (PP) is horizontal line
drawn through pupils. This line is
usually parallel to the horizon
and is referred to as frontal
postural horizontal. Upper dental
arch (UDA) level is a line formed
through the left and right
maxillary canine tips. Lower
dental arch (LDA) level is a line
formed through the left and right
mandibular canine tips. Chin-jaw
line (CJL) is assessed by a line
drawn on the under surface of the
chin at maximum tissue contact.
All four lines should be parallel
to each other


Constructed horizontal reference line
is formed by drawing line
through pupil area parallel to
floor. This line is used when the
pupil plane is not parallel to the
floor (eyes are not level) when
the head is in frontal postural
horizontal.


Midline alignments
Important midline structures are
assessed. Nasal bridge (NB),
nasal tip (NT), filtrum (F), upper
incisor midline (UIM), lower
incisor midline (LIM), and chin
midline point (Me') should be on
a line that is perpendicular to the
frontal postural horizontal.
Filtrum is usually the least
asymmetric of these points and is
therefore generally used as a
starting point for midline
structure assessment. All midline
points may not line up. The
dental midlines and chin should
be placed to integrate with other
midlines (most importantly the
filtrum center


When pupils are not level,
constructed horizontal reference
line (Fig. 3) is used. A
perpendicular to the constructed
horizontal line through filtrum is
used to assess other midline
structures.


Facial one thirds
Face is divided into thirds by
drawing lines through hairline
(H), midbrow (Mb), subnasale
(Sn), and soft tissue menton
(Me').


Lower one-third evaluation

With lips relaxed, lower third is
subdivided by drawing lines
through subnasale (Sn), upper lip
inferior (ULI), lower lip superior
(LLS), and soft tissue menton
(Me'). The upper lip is half the
length of the lower


Incisor exposure is measured with
lips relaxed from upper lip
inferior (ULI) to maxillary
incisor edge (MxlE). The upper
tooth to lip (UTTL) is the vertical
dimension of the incisor exposed
between ULI and MxlE.


Interlabial gap is measured in
relaxed lip position from upper
lip inferior (ULI) to lower lip
superior (LLS).


PROFILE VIEW

Profile angle

Profile angle is measured by
connecting points glabella (G'),
subnasale (Sn), and soft tissue
pogonion (Pg'). The angle is
measured on the left hand side
with the patient facing right.


Nasolabial angle
Nasolabial angle is developed by
connecting columella line
(inferior nasal septum) (C),
subnasale (Sn), and upper lip
anterior point (ULA)


Maxillary sulcus contour
Maxillary sulcus contour (MxSC) is
subjectively assessed. The
contour is described as either
accentuated, gentle curve
(normal) or flat. Measurement of
this contour is impractical


Mandibular sulcus contour
Mandibular sulcus contour (MdSC)
is subjectively assessed. The
contour is either accentuated,
gentle curve (normal) or flat.
Measurement of this contour is
impractical.


Orbital rim
Orbital rim projection is measured
from the anterior most globe
(Gb) to the orbital rim point
(OR). A subjective orbital rim
description is also given: Normal,
flat, or protruded.


Cheekbone contour & Nasal base-lip contour

Cheekbone contour is anteriorly facing, curved line that starts just anterior to ear,
extending forward through cheekbone point (CP), then extending anterior-inferiorly
ending at maxilla point (MxP) adjacent to alar base of nose. For descriptive purposes
the cheekbone contour is divided into three areas: (1) zygomatic arch, (2) middle
contour area, and (3) subpupil areas. These three areas, when taken together, constitute
the cheekbone contour. Reconstruction of cheekbone contour, when deficient, should
analyze all three parts separately in terms of correction. CP and MxP indicates osseous
cheekbone and maxillary base positions, respectively. The nasal base-lip contour (NbLC) extends inferiorly from the maxilla point (MxP) as a gentle, anteriorly facing
curve, ending just below and lateral to the mouth commissure. In normoskeletal
patients the cheekbone-nasal base-lip contour complex is a smooth continuation,
anteriorly facing, curved line. This line, when viewed frontally or from the side, is a
definite flowing curve with no interruptions which are apparent with skeletal
deformities.

Maxillary retrusion: Cheekbonenasal base-lip curve is interrupted
at MxP


Mandibular protrusion: Cheekbonenasal base-lip curve is interrupted
in upper lip area.


Nasal projection
Nasal projection (NP) is measured
from subnasale (Sn) to nasal tip
(NT). The lines through Sn and
NT are perpendicular to the floor
when the head is in a natural
postural position


Throat length and contour
Throat length (TL) is assessed from
neck-throat point (NTP) to soft
tissue menton (Me'). This
distance is subjectively described
as either normal, long or short
length, and with or without sag.


Subnasale-pogonion line (Sn-Pg')
Subnasale-pogonion reference line is
generated through points
subnasale (Sn) and soft tissue
pogonion (Pg'). Lip projections
are evaluated relative to this line.


A, Normal lip relationship to Sn-Pg'
line.
B, Premature aging associated with
premolar extractions and incisor
retraction.
The lips fall on or behind the Sn-Pg'
line giving the "dished-in"
orthodontic appearance. The
nasolabial angle may also open
to unacceptable ranges.


Sn-Pg' line is frequently used to
surgically assess chin-lip-nasal
base balance. With the VTO
occlusion in Class I, the line is
oriented from Sn through ideal
lip position. If Pg' falls on the
chin, balance of chin-lip-nasal
base is ideal. If Pg' falls behind
the line, a chin advancement is
necessary to obtain balance.


SOFT TISSUE CHARACTERISTICS OF COMMON
SKELETAL DEFORMITIES

Class I occlusion and chin
projection can occur in
combination with vertical
maxillary excess or
vertical maxillary
deficiency. The
anteroposterior profile is
normal, but the vertical
height of the face is long
or short.


Vertical maxillary excess


Vertical maxillary deficiency


Class II bite and chin
projection can be produced
by entirely different
skeletal patterns.
Maxillary protrusion,
mandibular retrusion and
vertical maxillary excess
all can produce identical
bites with similar chin
profiles. The arrows
indicate the skeletal
abnormality responsible
for the bite and profile
disharmony.


Maxillary protrusion


Mandibular retrusion


Class III bite and chin
projection can be
produced by entirely
different skeletal
patterns. Maxillary
retrusion, mandibular
protrusion, and vertical
maxillary deficiency all
can demonstrate
identical Class III bite
and similar profile
characteristics. The
arrows indicate the
skeletal abnormality
responsible for bite and
facial profile
disharmony


Maxillary retrusion


Mandibular protrusion


CONCLUSION
Orthodontists use dental and facial keys to diagnose and
to treat malocclusions. Dental keys include overjet,
canine occlusion, and molar occlusion. The dental
keys are given much weight in the determination of
treatment. Facial keys are not used by some
orthodontists and sparingly by others. Typically, facial
keys used by orthodontists include the relative
positions of the upper lip, lower lip, and chin. These
give information, but only limited insight into the
comprehensive diagnosis.


In contrast, with the help of Soft Tissue Cephalometrics an
organized, comprehensive approach to facial analysis can be
done. With this analysis normal facial traits are maintained and
abnormal characteristics are corrected with orthodontics and
surgery. Information from facial examination of the patient
dictates which procedures result in optimal cosmetics with Class
I function. Mere correction to Class I occlusion can give random,
and often poor, cosmetic results. Further, arbitrary correction to
Class I occlusion does not ensure even presurgical cosmetic
levels, therefore esthetic guidelines must be followed when
determining surgical orthodontic plans


Beauty is in the eyes of
the Beholder


Soft tissue analysis 2 /certified fixed orthodontic courses by Indian dental academy

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