Research progress on concomitant hypodontia and hyperdontia

Abnormalifies in the number of teeth is a common oral disease, which can be manifested as excessive number of teeth (supernumerary teeth) and insufficient number of teeth (congenitally missing teeth). The two conditions can occur alone or simultaneously in the same individual. Camilleri referred to this abnormality, which has both supernumerary teeth and congenital insufficient number of teeth as comcomitant hypodontia and hyperdontia (CHH). CHH is a rare disease. At present, the etiology is not clear, and the prevalence varies greatly, with the incidence in men being higher than in women. It can be associated with multiple syndromes and other dental abnormalities. Most of the research on GHH now is based on case reports. This article reviews its etiology, clinical feature, impacts, diagnosis and treatment principles by synthesizing the relevant studies at home and abroad.