Hallermann–Streiff syndrome

Overview

Board takeaway: Assess micrognathia and limited opening before sedation, adapt communication for visual impairment, and protect defective teeth.

Micrognathia and a small upper airway complicate dental access and anesthesia; vision and dental defects need accommodations.

How does Hallermann–Streiff syndrome affect dental management?

• Airway: assess before any sedation and review OSA history.
• Difficult-airway planning: Micrognathia, a narrow airway, limited mouth opening, and TMJ anomalies can complicate intubation; GA requires an anesthesia team prepared for a difficult airway.
• Communication: adapt explanations and orientation to visual impairment.
• Dental care: protect malformed or hypoplastic teeth and assess eruption radiographically when indicated.
• Before extraction: A retained primary or supernumerary tooth is not an automatic extraction: assess the permanent successor, obstruction, pathology, and orthodontic plan.
• Growth: Plan prosthetic replacement and reassess fit as the child grows.

Exam pearl

What is Hallermann–Streiff syndrome?

A rare congenital disorder with characteristic skull and facial development, sparse hair, thin skin, short stature, and eye and dental abnormalities.

What are the main systemic features of Hallermann–Streiff syndrome?

• Cause: Oculomandibulofacial syndrome; mostly sporadic
• Craniofacial features: Dyscephaly with brachycephaly and frontal bossing, thin beaked nose, micrognathia, hypotrichosis, skin atrophy
• Eyes and growth: Bilateral congenital cataracts and microphthalmia; proportionate short stature
• Airway and development: Upper-airway obstruction and OSA from micrognathia and a narrow airway; intelligence usually typical

What oral findings occur in Hallermann–Streiff syndrome?

• Early teeth: Natal and neonatal teeth
• Tooth defects: Hypodontia, supernumerary teeth, malformed teeth, enamel hypoplasia
• Eruption: Retained primary teeth and delayed eruption
• Access and occlusion: High narrow palate, micrognathia with Class II, small mouth opening; TMJ anomalies can limit access

For Hallermann–Streiff syndrome, how do you adapt communication for visual impairment?

• Describe each step before touching the child
• Use verbal and tactile cues
• Keep the room layout consistent

Sources

• AAPD dental guidance: AAPD: Monitoring and management of pediatric sedation
• Supplemental study guide: Pediatric Dental Study Guide: Hallerman Streiff Syndrome
• Management of Dental Patients with Special Health Care Needs
• Management of the Developing Dentition and Occlusion in Pediatric Dentistry
• Pediatric Airway Assessment