Occlusion and Malocclusion - Aetiology of Malocclusion

5 important questions on Occlusion and Malocclusion - Aetiology of Malocclusion

Genetically, what is development of a palatally impacted canine associated with?

More common in females and certain ethnic groups and is often associated with microdont or absent lateral incisors (Peck et al, 1994)

Aetiology of Malocclusion - Soft Tissue

Local, e.g:
Digit sucking
Lip habit
Tongue habit
Frenum
Pathology, e.g. Scarring
Natural ageing process

General, e.g:
Genetic - homeobox genes
Lip morphology
Respiration
Pathology, e.g. CLP, trauma

Aetiology of Malocclusion - broad

95% of malocclusions are due to a variation of normal development
5% of malocclusions have an identifiable cause
Genetics tend to influence skeletal pattern
Environment influences tooth position
Both contribute to creating malocclusion

Genetic - skeletal pattern, some syndromes e.g. Muscular dystrophy, evolutionary trend to reduced jaw size and tooth number, hypodontia/tooth morphology

Environmental - Soft tissues, habits, local factors, pathology, trauma, respiration
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Aetiology of Malocclusion - Skeletal

Local, e.g:
Alveolar insufficiency

General, e.g:
Genetics - cranial base length
Saddle angle

Pathology, e.g:
Trauma

Head and neck syndromes

Aetiology of Malocclusion - Dental

Local, e.g:
Tooth number/size/shape
Ectopic position
Early/delayed loss

General, e.g:
Tooth size
Extensive hypo/hyperdontia

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