Ground glass appearance in bone is seen in________?

A boy complains of bleeding gums, swollen, joints with hemorrhage into joints His paternal and maternal uncle complains of same problem It is due to deficiency of factor________?

A five-year old child presents with chronic bed wetting and bilateral loose deciduous first molars. His mother says that she want to drink of water several times during each night. Which of the following is the most likely diagnosis?

Which of the following is an oral manifestation of lichen planus?

All are diseases of skin except:

Alveolitis sicca dolorosa is otherwise known as________?