The document summarizes the Margolis analysis, which uses a maxillofacial triangle to measure overall facial growth patterns. It describes how Herbert Margolis developed the analysis in 1947 using three lines: the cranial base line, facial line, and mandibular line. Key cephalometric landmarks are identified that are used to construct the triangle and measure three angles - the craniofacial angle, faciomandibular angle, and craniomandibular angle - to assess facial growth. Normal values for the angles are provided. The analysis can help with dentofacial diagnosis and treatment planning.

1. Margolis Analysis
DR ARIF ISMAIL
DEPARTMENT OF ORTHODONTICIS

2. CONTENTS
• Introduction
• Cephalometric Landmarks used in the
Analysis
• Procedure for the Analysis
• Conclusion
• Reference

3. HERBERT I.
MARGOLIS
(1904 – 1987)

4. • Dr. Herbert I. Margolis was born in the Ukraine
and was brought to Boston in 1904 by his
parents. He graduated from the Harvard Dental
School in 1921 and returned to it as an instructor
in dental anatomy four years later.
• He left Harvard in 1945 to join the faculty of the
Tufts School of Dental Medicine, where he
developed the Tufts Institute for Children with
Cleft Palate and Other Facial Deformities,
serving as its first director.

5. • He resigned from Tufts in 1960 to devote himself
to his clinical practice and research but was
persuaded to organize a course in Graduate
Orthodontics at Boston University's dental
school. He then served as professor and
chairman of the Department of Graduate
Orthodontics before retiring in 1967.
• Dr Margolis was credited with a number of
dental advances, including equipment known as
the Margolis cephalostat, which is still used in
orthodontic diagnosis.

6. MARGOLIS
INTRODUCED IN THE YEAR 1947
ANALYSIS

7. • The Margolis maxillofacial triangle is a means for
measuring the overall facial growth pattern.
• The interdependence of the size of the angles of
the triangle makes it a valuable aid in dentofacial
studies since it reveals the relative difference in
size and relationship of specific maxillofacial
areas to each other.

8. MARGOLIS TRIANGLE
Three sides of the triangle are :
•The cranial base line
•The facial line
•The mandibular line

9. Construction of the Triangle
• Draw the facial line, construct both the
mandibular plane and cranial base line
and extend them posteriorly, until they
meet.
• Margolis proposed that similar triangles
can be constructed with Bolton plane or
the S-N plane.

10. LANDMARKS USED
IN THE ANALYSIS
• Na
- nasion
• S
- sella
• Cranial Base line: It can be drawn from Nasion
through one of the following:
a)Cranial edge of the spheno-occipital synchondrosis
b)The Centre of Sella Turcica
c)The Boltons Point B
• Na-Pog - facial line
• NXM
- craniomandibular angle
• NMX
- facio mandibular angle
• MNX
- cranio facial angle

11. Craniofacial angle
• Mean value :
72.8 ± 2.36
This angle denotes the
position of the body of
the body of the mandible
and the anterior limit of
the body of the
mandible.
The smaller the angle,
more receding the chin.

12. Faciomandibular angle
• Mean value :
67.40 ± 2.770
This records the extent of
vertical growth &
development of the
mandible.

13. Craniomandibular angle
• Mean value :
39.60 ± 3.26
This value denotes the
extent of vertical growth
and development of the
mandible..

14. Normal
Patient Value
Inference
CFA
72.6 +/- 3.5
68
Normal
FMA
67.7 +/- 3.5
65
Normal
CMA
39.7 +/- 3.5
48
Increased

15. Reference
• Margolis H. Facial pattern and its application in clinical
orthodontics. Am J Oral Surg 1947;33:631-641.