Ortho - Lecture 3: Epidemiology/Etiology of Malocclusion Flashcards
What % of the population is normal occlusion?
25%
What % of the population is class I malocclusion?
50-55%
What % of the population is class II malocclusion?
15-20%
What % of the population is class III malocclusion?
1-3%
Short and broad face
Brachycephalic
Long and narrow face
Dolichocephalic
Normal face
Mesiocephalic
How soon does an orthodontist see a baby born with a cleft lip/palate?
1 week after birth
What does an orthodontist do for a cleft lip/palate prior to surgery?
Use appliances/tapes to bring gaps closer together (makes the surgery easier)
What are the environmental prenatal influences that can affect malocclusion?
Injury/trauma
Maternal diet
Fetal posture
Alcohol/drugs
What are the environmental postnatal influences that can affect malocclusion?
Condylar fracture
Birth injury
Accidents
Avulsion/displacement of teeth
What is the most common childhood fracture of the jaw?
Condylar neck of mandible
75% of early fractures have ___________ mandibular growth
normal
What may affect time of eruption, resorption, and formation of teeth?
High fever
What may affect muscular dystrophy, cerebral palsy, and polio?
Diseases of muscle dysfunction
What may affect abnormal pattern on resorption, eruption, and gingival disturbance?
Endocrine disorders
What causes deficiency diseases like Rickets and scurvey?
Poor diet
Poor diet/deficiency diseases may cause severe ____________ due to interference w/ craniofacial growth and development, in addition to perio problems associated w/ significant ________ _________
malocclusion; bone loss
What habits and function aberrations can cause malocclusion?
Thumb sucking
Foreign objects
Tongue thrusting
Lip/cheek biting
What would you expect to see with a child who sucks their thumb?
Upper incisors proclined
Lower incisors retroclined
Narrow maxilla
What would you expect to see with a child who has a tongue thrust?
Incisors displaced
Lip affects seal
Result from disturbance during initiation and proliferation stages
Supernumerary teeth
What is the most common location of mesiodens?
Between 8 and 9
Result from disturbance during initial stages of formation of a tooth
Congenitally missing teeth (anodontia, oligodontia, hypodontia)
When does a permanent tooth erupt into the oral cavity?
When 2/3 of the root is developed
When a patient has an abnormal labial frenum causing a large space between 2 teeth, do you close the space first or do the frenectomy first?
Close the space first
