IDRR APRIL -MAY -JUNE 2020 - Flipbook - Page 86
This measures whether the mandibular deviation present
or not. If present the deviation could be either structural or
positional.
Green Line : Bi-Menton plane and the
midpoint is the Bi-Me/2.
Blue line: Porion right to Bi-Me/2 and
Porion left to Bi-Me/2
Yellow plane: Porion right to porion left
Red Line:
TN’ plane
In normal cases 1: Pr-bi-me/2= Pl-Bi-me/2
With this analysis we will know the deviation
which could be either structural or positional.
In order to know exactly the cause of the
deviation we would need the second analysis
with another triangle.
B] Condyle-Mandibular Triangle.
It measures mandibular deviation specifying
whether it is structural or positional.
In normal cases: 1. Cdr-bi-me/2=Cdl-bi-me/2
with the point bi-Me/2
coincident to the TN’ plane.
2. Isosceles triangle with
the inferior vertex centred
at the Bi-Me/2 point and
coincident to the TN’plane.
2. An Isosceles triangle with
the inferior vertex centred
at the point bi-Me/2and
coincident with the TN’
plane
Figure 4 ; condyle mandibular triangle formed by connecting
the condylar plane to the bi menton point.
Fig 2 , shows normal mandibular centricity with no
deviation present
Figure 5: In this figure the condyle mandibular triangle shows a
symmetrical mandible with no deviation
MANDIBULAR POSITION DEVIATION( IF
FOR EXAMPLE TO THE LEFT SIDE)
Figure 3 Mandibular deviation to the left side
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April-May-June 2020
Left side:
1. Cdr-Bi-Me/2= Cdl-Bi-Me/2 with the point
Bi-Me/2 to the left side of the TN’ plane.
2. Symmetric Isosceles triangle but inferior
vertex deviated to the left side.
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