19 - abnormalities in the dveelopment of teeth. Abnormalities in the number of teeth - etiology types. Abnormalities in the size of teeth - etiology, types

what could cause (etiology) abnormalities in the number of teeth?

• destructions in dental lamina from the early stages of embryogenesis

• Errors in genetic control - e.g ectodermal dysplasia (hypodontia, conical teeth)

• Effect of environment

• Syndromes - e.g orofacial digital syndrome

• Due to issues in initiation and proliferation of dentition

Types of abnormalities in number of teeth

• Hypodontia - several missing teeth, due to overstimulation of dental lamina

• Hyperdontia - supernumerary teeth

• Oligodontia - more than six missing teeth

• Anodontia -missing all teeth

• Pseudo hypodontia - lack of teeth due to retention in the bone

• Neonatal teeth - teeth present at birth

• Hypodontia

• several missing teeth, due to overstimulation of dental lamina

• Hyperdontia

• supernumerary teeth

• Oligodontia

• more than six missing teeth

• Anodontia

• missing all teeth

• Pseudo hypodontia -

• lack of teeth due to retention in the bone

• Neonatal teeth

• teeth present at birth

causes of abnormalities (etiology) in size of teeth

• due to various etiological factors acting during morpho differentiation:

• Microdontia - disturbance in bud stage of development, genetic factors, down syndrome

• Macrodontia - pituitary gigantism, otodental syndrome, hyperinsulinism

types of abnormalities in size of teeth

• Megadontia/macrodontia - teeth are bigger than normal

• Microdontia - teeth are smaller than normal

megadontia/macrodontia

teeth are bigger than normal

microdontia

teeth are smaller than normal