Preauricular pain, grating sensation and partial trismus are the symptons of________?

In ectodermal dysplasia all of the following structures are affected except:________?

The most common site for metastasis from carcinoma of cheek________?

Type of collagen present in cicumaxillary sutures ________?

Mottled enamel is due to________?

The histopathology of osteopetrosis shows________?