Mc NAMARA
ANALYSIS
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandent...
INTRODUCTION
Described by James A McNamara in 1984
Jr Professor of Orthodontics, Centre for Human
Growth and development, ...
Need for this analysis
 It

relates teeth to teeth, teeth to jaws, each
jaw to the other and jaws to the cranial base.
 ...
 The

composite normative standards used in
this analysis were derived from 3 sources;
1. lateral cephalograms of the chi...
www.indiandentalacademy.com
LANDMARKS
 ANS

- ant tip of the sharp bony process of
maxilla in the midline of the lower margin of
ant nasal opening
 ...
 The

craniofacial skeletal complex is divided
into 5 major sections – to create a clinically
useful analysis
1. Maxilla ...
MAXILLA TO CRANIAL BASE
 Soft

tissue evaluation.
1. nasolabial angle
2. cant of upper lip
 Nasolabial angle
is formed b...
Nasolabial Angle
www.indiandentalacademy.com
Cant of upper lip
 Should be slightly
forward to form an
angle with nasion
perpenticular
 14 (SD of 8 )in
women


8 (SD...
Hard tissue evaluation
 To

determine the anteroposterior orientation
of maxilla, relative to cranial base –linear
distan...
www.indiandentalacademy.com
 Exceptions:
 Nasion

perpenticular variability:
cl III malocclusion – short cranial base.
backward position of N gives ...
MAXILLA TO MANDIBLE
Anteroposterior relationship
Mid facial length- a line
from condylion to pt A
Effective mandibular len...


The effective lengths max &mand are related to
the size of the component parts .
thus termed ,
small for mixed dentitio...
 Vertical

relationship
- lower ant face height
- mand plane angle
- facial axis angle

 Lower

anterior face height
-me...
www.indiandentalacademy.com
www.indiandentalacademy.com
Mandibular plane angle
Angle between the Frankfort horizontal & line drawn
along the lower border of the mandible (Go-Me)
...
 Facial

axis angle
Angle formed by line constructed from the
posterosuperior aspect of the
pterygomaxillary fissure to G...
Facial Axis Angle
www.indiandentalacademy.com
MANDIBLE TO CRANIAL BASE
 Is

determined by measuring distance from
pogonion to nasion perpendicular.
In mixed dentition
...
DENTITION
Helps in determining the
anteroposterior position of
both upper and lower incisors.
Maxillary Incisor Position
V...
Mandibular Incisor Position
The distance between
the edge of the
mandibular incisor and a
line drawn from pt A to
pog is m...
AIRWAY ANALYSIS
The purpose of this analysis is to find out the
possibility of any airway impairment.
Upper Pharynx
Is mea...
Lower Pharynx
Is measured from the pt of intersection of the
post border of the tongue and the inferior
border of the mand...
www.indiandentalacademy.com
Cant of upper lip

102o + 8
14o + 8
0 – 1mm

112-114
89
26 + 4

65 + 4

93deg
23o

-7mm

112
89
23

69
33deg
-2deg

www.in...
-5.5 + 4

-15mm

10mm
9mm
13mm
10mm

www.indiandentalacademy.com

Retrusive
mandible

Forwardly
placed
decreased
www.indiandentalacademy.com
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Mc namara analysis /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
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Mc namara analysis /certified fixed orthodontic courses by Indian dental academy

  1. 1. Mc NAMARA ANALYSIS INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. INTRODUCTION Described by James A McNamara in 1984 Jr Professor of Orthodontics, Centre for Human Growth and development, University of Michigan. This analysis helps in the evaluation and treatment planning of orthodontic and orthognathic surgery patients  In a normal well balanced occlusion, the skeletal and dentoalveolar components of jaw are well related to each other. www.indiandentalacademy.com
  3. 3. Need for this analysis  It relates teeth to teeth, teeth to jaws, each jaw to the other and jaws to the cranial base.  This analysis can be easily communicated to lay persons ,such as patients and parents, and to other dental professionals who do not have detailed knowledge of cephalometrics. www.indiandentalacademy.com
  4. 4.  The composite normative standards used in this analysis were derived from 3 sources; 1. lateral cephalograms of the children comprising the Bolton standards 2. selected values from a group of untreated children from the Burlington Research Centre 3. a sample of young adults from Ann Arbor, having good to excellent facial and dental configurations and good skeletal balance with an orthognathic facial profile www.indiandentalacademy.com
  5. 5. www.indiandentalacademy.com
  6. 6. LANDMARKS  ANS - ant tip of the sharp bony process of maxilla in the midline of the lower margin of ant nasal opening  Co - the most posterosuperior pt on the outline of mand condyle  Ba – median pt of the ant margin of the foramen magnum  Ptm – contour of pterygomaxillary fissure formed ant by retromolar tuberosity of maxilla & posteriorly by ant curve of pterygoid processof sphenoid bone www.indiandentalacademy.com
  7. 7.  The craniofacial skeletal complex is divided into 5 major sections – to create a clinically useful analysis 1. Maxilla to cranial bone 2. Maxilla to mandible 3. Mandible to cranial bone 4. Dentition 5. Airway www.indiandentalacademy.com
  8. 8. MAXILLA TO CRANIAL BASE  Soft tissue evaluation. 1. nasolabial angle 2. cant of upper lip  Nasolabial angle is formed by drawing a line tangent to the base of the nose and a line tangent to the upper lip  In adult males & females 102 deg (SD of 8)  Acute angle due to dentoalv protrusion or orientation of base of nose www.indiandentalacademy.com
  9. 9. Nasolabial Angle www.indiandentalacademy.com
  10. 10. Cant of upper lip  Should be slightly forward to form an angle with nasion perpenticular  14 (SD of 8 )in women  8 (SD of 8 ) in man www.indiandentalacademy.com
  11. 11. Hard tissue evaluation  To determine the anteroposterior orientation of maxilla, relative to cranial base –linear distance between N perpendicular and pt A  Ant position of pt A -- +ve value post position of pt A -- -ve value In well balanced face, 0 mm in mixed dentition 1 mm in adult male& female www.indiandentalacademy.com
  12. 12. www.indiandentalacademy.com
  13. 13.  Exceptions:  Nasion perpenticular variability: cl III malocclusion – short cranial base. backward position of N gives an appearance of excessively anteriorly positioned max &mand  Pt A variability: In cl II div 2 case - excessive lingual tipping of crowns of upper incisors,so pt A is 1-2 mm labially placed. www.indiandentalacademy.com
  14. 14. MAXILLA TO MANDIBLE Anteroposterior relationship Mid facial length- a line from condylion to pt A Effective mandibular lengtha line from Co to Gn Any effective midfacial length corresponds to an effective mand length www.indiandentalacademy.com
  15. 15.  The effective lengths max &mand are related to the size of the component parts . thus termed , small for mixed dentition medium for adult female large for adult male To determine the maxillomandibular difference the mid facial length is substracted from mand length (Co-Gn)-(Co-A) in small inividuals20-23 mm in medium sized individuals 27-30 mm in large individuals 30-33 mm www.indiandentalacademy.com
  16. 16.  Vertical relationship - lower ant face height - mand plane angle - facial axis angle  Lower anterior face height -measured from ANS - Me -it correlates with the length of midface -forwardly or backwardly placed chin point attribute to deficient or excessive lower face height respectively. www.indiandentalacademy.com
  17. 17. www.indiandentalacademy.com
  18. 18. www.indiandentalacademy.com
  19. 19. Mandibular plane angle Angle between the Frankfort horizontal & line drawn along the lower border of the mandible (Go-Me) Avg 22 deg + 4 deg www.indiandentalacademy.com
  20. 20.  Facial axis angle Angle formed by line constructed from the posterosuperior aspect of the pterygomaxillary fissure to Gnathion relative to the Cranial base (Ba-Na). In a balanced face- Facial axis angle is perpendicular. A –ve value means excessive vertical growth of face. A +ve value means deficient vertical growth of face. www.indiandentalacademy.com
  21. 21. Facial Axis Angle www.indiandentalacademy.com
  22. 22. MANDIBLE TO CRANIAL BASE  Is determined by measuring distance from pogonion to nasion perpendicular. In mixed dentition 6-8 mm (behind N per) In adult female 4-0 mm (behind N per) In adult male 2 mm (behind or fwd of N per) www.indiandentalacademy.com
  23. 23. DENTITION Helps in determining the anteroposterior position of both upper and lower incisors. Maxillary Incisor Position Vertical line is drawn through pt A parellel to nasion perpendicular. The distance from pt A to facial surface of upper incisor is measured. The normal value is 4-6 mm. www.indiandentalacademy.com
  24. 24. Mandibular Incisor Position The distance between the edge of the mandibular incisor and a line drawn from pt A to pog is measured. In a well-balanced face it is 1-3 mm. www.indiandentalacademy.com
  25. 25. AIRWAY ANALYSIS The purpose of this analysis is to find out the possibility of any airway impairment. Upper Pharynx Is measured from a pt on the post outline of the soft palate to the closest point on the pharyngeal wall. The avg nasopharynx is 15-20 mm. A width of 2 mm or less indicate airway impairment. www.indiandentalacademy.com
  26. 26. Lower Pharynx Is measured from the pt of intersection of the post border of the tongue and the inferior border of the mandible to the closest pt on the post pharyngeal wall. Avg measurement is 11-14 mm. www.indiandentalacademy.com
  27. 27. www.indiandentalacademy.com
  28. 28. Cant of upper lip 102o + 8 14o + 8 0 – 1mm 112-114 89 26 + 4 65 + 4 93deg 23o -7mm 112 89 23 69 33deg -2deg www.indiandentalacademy.com normal normal Maxillary skeletal retrution normal normal increased Vertically growing pattern
  29. 29. -5.5 + 4 -15mm 10mm 9mm 13mm 10mm www.indiandentalacademy.com Retrusive mandible Forwardly placed decreased
  30. 30. www.indiandentalacademy.com

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