Haemophilia is one of the most frequent coagulation disorders in man. Its inheritance is recessive and is linked to chromosome X.
Females are often carriers while men are symptomatic. To prevent bleeding during dental treatment/surgery the concentrate of either coagulation factor F VIII or F IX is administered to the patient to normalize the plasmatic level of missing/impaired clotting factor in patient's blood.
We preset a case report focused on the orthodontic treatment in a boy with moderate haemophilia A. Key words: haemophilia, paediatric dentistry, orthodontics.