All of the following are causes of delayed dentition except
Rickets
Hyperparathyroidism
Hypothyroidism
Cleidocranial dysplasia
Delayed dentition means there is no eruption of teeth by the age of 13 months of age (mean + 35D).
Causes of delayed dentition:
Rickets
Down syndrome
Hypothyroidism
Hypoparathyroidism
Cleidocranial dysplasia