Beta thalassemia

Overview

Board takeaway: Check anemia, transfusions, and iron overload before care. This inherited disorder reduces beta-globin chain production; severe forms cause transfusion-dependent anemia and marrow expansion with characteristic facial changes.

How does Beta thalassemia affect dental management?

• Readiness: For transfusion-dependent or symptomatic disease, coordinate with hematology on hemoglobin, transfusion timing, chelation, and cardiac/liver function. A transfusion date alone does not establish readiness for surgery
• Infection: Asplenic patients need prompt assessment of infection. Discuss prophylaxis for invasive care with the physician; asplenia is an AAPD consideration for individualized coverage, not an automatic regimen
• Anesthesia: Cardiac complications of iron overload may affect anesthesia and sedation planning
• Occlusion: Interceptive orthodontics may help; coordinate with craniofacial care
• Prevention: Prevention to avoid infection and invasive procedures

Exam pearl

What is Beta thalassemia?

An inherited blood disorder in which reduced or absent beta-globin production lowers hemoglobin, causing anemia ranging from mild (trait) to severe and transfusion-dependent (thalassemia major).

What are the main systemic features of Beta thalassemia?

• Inheritance: Autosomal recessive; more common in people of Mediterranean, Middle Eastern, South Asian, and Southeast Asian ancestry
• Severe disease: Thalassemia major: severe microcytic anemia from infancy, requiring regular transfusions
• Marrow: Ineffective erythropoiesis drives marrow expansion and hepatosplenomegaly
• Organ effects: Iron overload from transfusions damages the heart, liver, and endocrine glands; treated with chelation
• Infection risk: Splenectomy (in some) increases the risk of serious bacterial infection

What oral findings occur in Beta thalassemia?

• Maxillary expansion with protrusion and spacing of the maxillary incisors; Class II tendency
• Pale mucosa; glossitis
• "Hair-on-end" skull and enlarged marrow spaces ("chicken-wire" trabeculae) on radiographs
• Possible painful parotid swelling and dry mouth from iron deposition
• Higher caries and gingivitis rates in some studies

Why do children with thalassemia major develop facial changes?

• Trigger: severe anemia drives the bone marrow to expand to produce red cells.
• Effect: marrow expansion in the maxilla and skull enlarges the bones, producing maxillary protrusion, flared incisors, and frontal bossing.
• Treatment effect: early, regular transfusion reduces these changes.

For Beta thalassemia, why does splenectomy matter for dental care?

• Risk: overwhelming infection by encapsulated bacteria after splenectomy.
• Dental care: treat infection promptly and obtain medical advice for fever or systemic illness. Decide procedural prophylaxis with the physician from the immune history, current daily antibiotics, and proposed procedure.
• History: vaccination status and daily antibiotic prophylaxis.

Sources

• Definition: MedlinePlus Genetics: Beta thalassemia
• Hematology Consultation for Pediatric Dental Patients
• Antibiotic Prophylaxis for Dental Patients at Risk for Infection