Etiology of Malocclusions Flashcards
What are the 4 predisposing factors to malocculsion?
- Disturbances in Embryologic Development
- Heredity
- Habits
- Traumas
What concept connects genetics and environment in the realm of the ability to affect malocclusion?
Epigenetics
What are the 4 primary etiological sites of malocclusions?
- Neuromuscular system… Cerebral Palsy
- Bone: OI
- Teeth: Ectodermic Dysplasia
- Soft tissues (excluding muscles)
_______ may interfere with cellular differentiation in embryological development Ex. cleft lip and palate
Teratogens
________ is the most frequently occurring member of this group. It is characterized by underdevelopment of the midface and eyes that seem to bulge from their sockets (craniosynostosis)
Crouzon’s syndrome
- underdeveloped cheek and jawbones,
* prominent nose, broad mouth and characteristically small chin with steep lower jaw angle.
Treacher collins
•Dental abnormalities -failure to lose the baby teeth (deciduous) at the expected time; slow eruption of secondary teeth; extra teeth; delayed or absent formation of teeth
Cleidocranial dysplasia
Midline deviation. Asymmetry: repercussion on the condyles.
Posterior open bite: lack of chewing capability
Osteogenesis imperfecta
- Underdevelopment or hypoplasia of the midfacial region.
- The bridge of the nose, bones of the midface and maxilla are relatively smaller in size.
- Prognathic Class III occlusal relationship which contributes to an open bite
Down syndrome
_______ is important in the following:
•Position and projection of the upper jaw
•Position and projection of the lower jaw
-Formation of the midface and cranial vault
Cranial base
Class ______ malocclusion:
- Maxillary prognathism
- Mandibular retrognathism
Class 2
Class ______ malocclusion:
- Orthognathic
- Jaw without prognathism
- Normally positioned
Class 1
Class ______ malocclusion:
- Mandibular prognathism
- Maxillary deficiency
Class 3
Which malocclusion is the most complicated to treat?
Class 3
In which malocclusion is the proclination of the max incisors considered a viable treatment option?
Class 3
