AGNATHIA

  • Absence of Maxilla/Mandible
  • Maxillary process in maxilla
  • More commonly missing ramus in Mandible
Agnathia

MICROGNATHIA

  • Small jaw is commonly referred to as Micrognathia
  • 2 Classification
Micrognathia

1. True micrognathia

2.Apparent micrognathia

TRUE MICROGNATHIA

  1. Congenital type
  2. Acquired type

CONGENITAL

  • It is associated with congenital heart disease & Pierre Robin syndrome
  • Maxillary micrognathia due to deficiency in premaxillary area
  • Retracted middle third of face

ACQUIRED TYPE

  • It is postnatal
  • Due to disturbance in TMJ region
  • Ankylosis due to trauma or infection of mastoid

CLINICAL FEATURES

  • Severe retrusion of chin
  • Steep mandibular angle
  • Deficient chin button

PIERRE ROBIN SYNDROME

Pierre Robin syndrome
  • Cleft palate
  • Micrognathia
  • Glossoptosis
  • Congenital heart defects
  • Ocular anomalies
  • Skeletal defects

MACROGNATHIA

Macrognathia
  • Abnormally large jaws
  • Pituitary gigantism -both jaws large
  • Maxillary enlargement-Paget’s disease, Leontiasis ossea, Cherubism
  • Mandibular enlargement- Acromegaly

TREATMENT

  • Surgical correction of the defect

MDS QUESTIONS

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1.Abnormally large jaws is seen in ?

A.Pierre Robin syndrome

B.Macrognathia

C.Agnathia

D.All of the above

2.Congenital heart defects are more commonly seen in ?

A.Agnathia

B.Macrognathia

C.TMJ disorder

D.Pierre Robin syndrome

3.All are features of Micrognathia except ?

A.Severe retrusion of chin

B.Steep mandibular angle

C.Deficient chin button

D.Absence of Maxilla/Mandible

1.B 2.D 3.D

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