Submitted by Jennet Bader Roll no 39 Developmental

Submitted by; Jennet Bader Roll no: 39

Developmental disturbance in teeth are of 5 types based on the feature of the tooth they effect. . • Size of Teeth • Shape of Teeth • Number of Teeth • Structure of Teeth • Growth(Eruption)of Teeth

Based on the Size of Teeth It is classified into two; Microdontia Macrodontia

Microdontia It is defined as size of teeth which is smaller than normal range of teeth size. MICRODONTIA is again divided into 3 types: 1. True Generalized 2. Relatively Generalized 3. Involving a Single Tooth

True Generalised All the teeth are small than normal. Teeth are well formed but small in size. Incidence: Very Rare Aetiology: Pitutary dwarfism, Downs syndrome.

Relatively Generalised Teeth are normal or slightly smaller than normal teeth within the range of size of teeth, but the jaw size is slightly larger than the normal giving an Impression of Microdontia. Aetiology: Inheritance of Jaw size from one parent and the teeth from another parent may lead to this condition. Involving a Single Tooth: It is also called as localised Microdontia, affecting commonly the Maxillary lateral incissor and the Third Molar. Incidence: Rather Common Aetiology: Supernumerary teeth and in Facial Hemiatrophy.

• Common Form in PEG laterals: The mesial and distal surfaces converge to the top forming a cone shaped crown with the roots being shorter than normal. • Treatment: • Treatment mainly requires prosthodontic intervention as the teeth are smaller in size they are useful in preparing crowns and using the teeth as abutments. • Single Crowns – In case of Localized Microdontia • Multiple Crowns or Bridges – In case of Generalized Microdontia with missing teeth

Peg Lateral

Macrodontia…: : :

Macrodontia are again divided into 3; True Generalised • All teeth are larger than normnal • It is extremely Rare • Seen in cases of Pituitary.

Relative Generalised Macrodontia: Teeth are slightly larger than average teeth. It is a result of presence of normal or slightly larger than normal teeth in small jaws. The difference in size gives the illusion of Macrodontia. A person will inherit jaw size from one parent & tooth size from the other so we can make out that this can create a illusion of Macrodontia & Microdontia.

Macrodontia-radiograph

Macrodontia of single tooth…. : : ; : - The Tooth is normal in all aspects : -This is an example of macrodontia which is often confused with fusion of teeth. : -In Hemihypertophy of face where the teeth on the side involved are larger than those on the uneffected side.

Developmental disturbance affecting the number of tooth Supernumerary Anodontia Pre decidious tooth Post permanent tooth

Missing bilatral second premolar. .

1. Total anodontia : total failure of development of a complete dentition {extremely rare} 2. Partial anodontia : failure of development of one or more teeth. the teeth most frequently missing are third molars, permanent maxillary lateral incisors, 2 nd premolars 3. Hypodontia or anodontia: associated with systemic defects 1) Hereditary hypohidrotic ectodermal dysplasia 2) Down syndrome : missing third molars