2. General information
• Severely deficient jaw, which most commonly
affects the mandible
• common to see individuals having a very small
mandible
3. Types
• Apparent micrognathia- illusion of
micrognathia
• true micrognathia- due to small jaw.... It can
be congenital or acquired
4. Aetiology
• It is associated with other congenital
abnormalities like congenital heart disease and
Pierre Robinsons syndrome
• forceps delivery trauma
• ankylosis
• mouth breathing
• agenesis of condyle
• posterior positioning of mandible with regard to
skull
5. Clinical features
• Micrognathia of maxilla – due to deficiency of
premaxillary area and it appears to have the
middle third of face retracted
• true mandibular micrognathia – uncommon and
patient appears clinically to have severe retrusion
of chin, steep mandibular angle and deficient chin
button
• there is abnormal alignment of teeth
• the jaw is small enough to interfere with feeding
of infant and may require special nipples in order
to feed adequately
