Vahid Ziaee1, Ali Rabbani1. 1. Growth and Development Research Center, Tehran University of Medical Sciences, Tehran, Iran ; Department of Pediatrics, Tehran University of Medical Sciences, Tehran, Iran.
Although the premature tooth exfoliation (PTE) can be associated with some systemic diseases such as changes in immune system or connective tissue disorders, we didn't find any report on this disorder and hypophosphatemic rickets. In bone metabolic disorders, there are a few reports on hypophosphatasia and PTE[. Although, some factors such as severe oral infection can predispose PTE in HR patients, we recommend a study on prevalence of PTE and its related factors in HR patients in future.The inflammation of the gingiva was evaluated by Gingival Index of Loe and Silness index[. It was missed to mention in our article. As we mentioned, dental examination was performed by the same dentist in all patients[.We agree with Ramezani about the prevalence of taurodontism as a common dental problem with wide range of prevalence in normal population (up to 8%[), but as we reported in our paper the prevalence of this disorder was 15% that is very more common than in normal population[. It was reported in 0.3% of normal children[.Finally, for diagnosis of taurodontism, as mentioned in our report, orthopantomogram was performed in all taurodontism suspicious patients[.