Margolis Analysis

DR ARIF ISMAILDEPARTMENT OF ORTHODONTICIS

CONTENTS

• Introduction

• Cephalometric Landmarks used in the Analysis

• Procedure for the Analysis

• Conclusion

• Reference

HERBERT I. MARGOLIS(1904 – 1987)

• 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.

• 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.

MARGOLIS ANALYSIS INTRODUCED IN THE YEAR 1947

• 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.

MARGOLIS TRIANGLE

Three sides of the triangle are :

•The cranial base line

•The facial line

•The mandibular line

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.

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

synchondrosisb)The Centre of Sella Turcicac)The Boltons Point B • Na-Pog - facial line• NXM - craniomandibular angle• NMX - facio mandibular angle• MNX - cranio facial angle

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.

Faciomandibular angle

• Mean value :

67.40 ± 2.770

This records the extent of vertical growth & development of the mandible.

Craniomandibular angle

• Mean value :

39.60 ± 3.26

This value denotes the extent of vertical growth and development of the mandible..

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

Reference• Margolis H. Facial pattern and its application in clinical

orthodontics. Am J Oral Surg 1947;33:631-641.