Causes of early loss of deciduous teeth

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There are many causes of early loss of deciduous teeth:
1-destructive caries with its sequela of periapical infection.
2-Ectopic or abnormal eruptive position of the first permanent molar.The latter tooth erupts under-neath the exaggerated distal bulge of the crown of the second deciduous molar with subsequent destruction of the distal part of the crown.
3-Ueven resorption of the roots of the deciduous second molar due to abnormal position of the unerupted second bicuspid.
4-Congenital absence of permanent second bicuspid does prevent the resorption of the roots of the second deciduous molar.In this case the second deciduous molar is extracted and a space maintainer is fabricated.
5-Ankylosed second deciduous molar with or without the congenital absence of the bicuspid