Steiner analysis /certified fixed orthodontic courses by Indian dental academy

“STEINER’S ANALYSIS”
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com


introduction
Cecil C. Steiner in 1930 proposed the appraisal of various parts of skull
separately namely skeletal,dental & soft tissue
Skeletal analysis entails relating the upper & lower jaw to the skull &
to each other
Dental analysis entails relating upper & lower incisors teeth to
respective jaws & to each other.
Soft tissue appraisal provides a means of assessing the balance &
harmony of the lower facial profile.
He selected sella nasion as reference line


STEINER’S ANGLE

SKELETAL
DENTAL
-SNA
-SNB
-ANB
-occlusal plane
-mandibular plane

-maxillary incisor position
-mandibular incisor position
-interincisal angle
-lower incisor to chin


SOFT TISSUE
-S line

MAXILLA (SNA)
- A & B are regarded as anterior limits of apical bases of maxilla &
mandible.
- Determines whether the maxilla is positioned anterior / posterior to the
cranial base
- Angle formed between S-N & N-A
- Mean is 82
- Greater angle indicates relative forward positioning of maxilla & lesser
angle indicates recessive location of maxilla


MANDIBLE (SNB)
- formed between S-N & N-B to access the mandible in relation to the
cranial base.
- Mean is 80
- Angle less than 80 indicates recessive mandible while greater angle
suggest Prognathic mandible


RELATIONSHIP OF MAXILLA TO MANDIBLE (ANB)
- angle provides a general idea of anterioposterior
discrepancy of maxilla to mandibular apical bases
- Mean is 2
- Greater than the mean indicates a class
II skeletal tendency, angle less than
2 & below zero indicates the
mandible located ahead of
maxilla suggesting class III


OCCLUSAL PLANE
- drawn through the region of overlapping cusps of 1st premolars & 1st
molars
- Angle of occlusal plane & S-N is measured
- Mean reading is 14


MANDIBULAR PLANE
- drawn between gonion & gnathion
- Angle is formed relating to the anterior cranial base
- Mean reading is 32
- Excessively high or low mandibular plane angles suggest unfavorable
growth pattern in individuals


MAXILLARY INCISOR POSITION
- formed by intersection of long axis of upper central incisors & line
joining N-A line
- upper incisor to N-A in degree indicates relative angular relationship of
upper incisor teeth i.e.22 , while upper central incisor to N-A in mm
gives the relative forward or backward positioning of incisor teeth to NA line i.e. 4mm


MANDIBULAR INCISOR POSITION
- formed between long axis of lower central incisor & N-B plane
- Indicate inclination of lower central incisors with a mean value of 25
increased value indicates proclined lower anteriors
- Linear distance between labial surface of lower central incisors to N-B
line for the assessment of lower incisor inclination. The normal value
is 4mm


INTERINCISAL ANGLE
- is the angle formed between the long axis of upper
& lower central incisors
- Mean value of 130-131
- Reduced angle suggest class II div 1, larger angle
indicates class II div 2


LOWER INCISORS TO CHIN
- according to Holdaway’s the distance between the labial surface of
lower incisors to N-B line must be equal
- 2mm of discrepancy is expectable
- 3mm is less desirable, but tolerable
- More than 4mm indicates corrective meassures


SOFT TISSUE ANALYSIS
- S line : the lips in a well balanced face should
touch a line extending from soft tissue contour of
the chin to the middle of an “S” formed by the
lower border of the nose
- If the lips are located beyond this line lips are
believed to be protrusive & interpreted as convex
profile
- If line behind this line said to be retrusive with a
concave profile.

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Steiner analysis /certified fixed orthodontic courses by Indian dental academy

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Steiner analysis /certified fixed orthodontic courses by Indian dental academy