Primary Etiologic site.
CLASSIFICATION OF ETIOLOGICAL FACTORS :General Factors :-
Hereditary racial Influence
Hereditary facial type
Hereditary Influence on Growth and developed
Hereditary or specific dentofacial morphologiccharacteristics
Teratogenic effects of drugs.
Systemic disease and Endocrinal disorders
Abnormal pressure habits
Anomalies of tooth function.
Anomalies of number.
Anomalies of Tooth size and shape.
Abnormal labial frenum.
Premature loss of deciduous teeth.
Prolonged retention and abnormal resorption of deciduous teeth.
Delayed eruption of permanent teeth
Abnormal eruptive path.
Improper dental restoration.