ANALYSISI OF DIAGNOSTIC RECORDS DIAGNOSTIC RECORDS DIAGNOSTIC CAST RADIOGRAPHS : Lateral Cephalogram and orthopentomogram and others PHOTOGRAPHS OTHERS, According to case.
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Transcript ANALYSISI OF DIAGNOSTIC RECORDS DIAGNOSTIC RECORDS DIAGNOSTIC CAST RADIOGRAPHS : Lateral Cephalogram and orthopentomogram and others PHOTOGRAPHS OTHERS, According to case.
ANALYSISI OF DIAGNOSTIC
RECORDS
DIAGNOSTIC RECORDS
DIAGNOSTIC CAST
RADIOGRAPHS : Lateral Cephalogram and
orthopentomogram and others
PHOTOGRAPHS
OTHERS, According to case
DIAGNOSTIC CAST
Symmetry and Space
Space Analysis
Tooth Size Analysis
SYMMETRY AND SPACE
Can be checked with transparent ruled grid placed over the
upper dental arch and oriented to the midpalatal raphe
Asymmetry within the dental arch, but with symmetric arch
form, also can occur in severely crowded cases because of
*
lateral
drift of incisors due to premature loss of primary canine
*
one
permanent canine being blocked out of the arch while the
other is in its normal position.
Drift of posterior teeth is usually caused by early loss of a
primary molar, but sometimes develops even when primary
teeth were exfoliated on a normal schedule.
SPACE ANALYSIS
Space available – Space required = Space discrepancy
Space available calculation
`
* Sum of linear segments of dental arch
* Contouring flexible brass wire on contact points of
posterior teeth and incisal edges of anterior teeth.
Space required calculation
Sum of mesiodistal with of all teeth upto 1st molar.
FACTORS AFFECTINTG SPACE
ANALYSIS
Anteroposterior position of incisor; i.e. proclined or
retroclined incisors.
1 degree
labially tipped incisor will require 0.8 mm space to
upright and v. v.
Growth changes
Migration of lower 1st permanatnt molar
Curve of Spee
Sum of
C.O.S. depth of both side / 2 plus 0.5 mm = Space
required to flatten the occlusal plane.
MIXED DENTITION SPACE
ANALYSIS
Radiographic Method
Tanaka and Johnston Prediction Method
Moyers Prediction Method
Staley & Kerber’s Combination Method
RADIOGRAPHIC METHOD
True width of primer molar
Apparent width of primary molar
=
True
width of unerupted premolar
Apparent
width of unerupted premolar
Short comings of the method
Advantages
TANAKA & JOHNSTON
PREDICTION METHOD
One half
of the
10.5
mesiodistal
mm
width of
+
the
four lower
11.0
incisors
mm
=
=
Estimated width of
mandibular canine
and premolars in
one quadrant
Estimated width of
maxillary canine
and premolars in
one quadrant
ASHLEY HOWE’S ANALYSISS
Total Tooth Material : Sum of mesiodistal width
of all teeth mesial to the 2nd molar
Premolar Diameter : Arch width between buccal
cusp tip of right & left upper 1st premolars
Premolar Basal Arch Width : Arch width
between right and left canine fossae. (If it is not
identifiable then 8 mm apical to interdental
papilla distal to canine.)
Ashley Howe’s Inference
If P.M.D.> P.M.B.A.W. :- Arch expansion is not
possible
If P.M.D.<P.M.B.A.W. :- Arch expansion is
possible
P.M.B.A.W. % = P.M.B.A.W. x 100
Total Tooth Material
If the ratio is less than 37% :- Extraction Case.
If it
is between 37-44% :- Borderline case
If it is
above 44% :- Nonextraction Case
PONTS ANALYSIS
S.I. :- Sum of mesiodistal width of maxillary four
incisors
M.P.V. :- Arch width between distal pits of right
&left maxillary 1st premolars
M.M.V. :- Arch width between mesial pits of right
and left maxillary 1st molars
C.P.V. :- S.I. x 100
80
C.M.V. :- S.I. x 100
64
Ponts Analysis Inference
If measured value is less than calculated value,
expansion is needed.
The difference between calculated and measured
value indicates amount of expansion required.
CAREY’S ANALYSIS
Arch length mesial to 1st mandibular molar is
measured.
Mesiodistal widths of all mandibular teeth
mesial to 1st molar is measured and is summed
up.
If the difference between these two value is <
2.5 mm :- Non extraction Case
2.5 - 5.o
mm :- Borderline Case
>5.0 mm :Extraction Case
BOLTON’S ANALYSIS
Sum of mesiodistal width of Maxillary 12 teeth
upto 1st molar
Sum of mesiodistal width of Mandibular 12 teeth
upto 1st molar
Sum of mesiodistal width of Maxillary 6 anterior
teeth
Sum of mesiodistal width of Mandibular 6
anterior teeth
Bolton’s Analysis Inference
Overall ratio= Sum of mandibular 12 x 100
Sum of maxillary 12
Anterior ratio = Sum of mandibular 6 x 100
Sum of maxillary 6
Normal value for overall ratio is 91.3 and for
anterior ratio is 77.2. By placing these value in
the formula, discrepancy can be calculated.