ANALYSISI OF DIAGNOSTIC RECORDS DIAGNOSTIC RECORDS  DIAGNOSTIC CAST  RADIOGRAPHS : Lateral Cephalogram and orthopentomogram and others  PHOTOGRAPHS  OTHERS, According to case.

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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.

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