lecture 9 Flashcards
predisposing factors to malocclusion
- genetics
- functional matrix (muscular or functional disturbances; habits)
- traumas
what are the 4 primary etiologic sites
- neuromuscular system
- bone
- teeth: [ectodermic dysplasia (# of teeth)]
- soft tissues[sclerodermia]
___ may interfere with cellular differentiation during pregancy
teratogens (alc, drugs, pollution)
early fusion of sutures, smaller maxilla, jaw grows normal. underdevelopment of the midface and eyes that seem to bulge from their sockets
crouzon symdrome (craniosynostosis syndrome)
underdeveloped cheek and jawbones, prominent nose, broad mouth and characteristically small chin with steep lower jaw angle.
sleep apnea
treacher collins
premature closing of coronal sutures. protruding JAW, ability to touch shoulders together in front of body, failure to lose baby teeth, extra teeth
cleidocranial dysplasia
OI:
class III malocclusion.
posterior open bite
[dentin affected]
class IV worst
what has midline deviation and asymmetric
OI
one of the most significant aspect of OI. not all teeth are affected in the same manner
dentinogenesis imperfecta
-underdevelopment or hypoplasia of the midfacial region.
-prognathic class III with open bite[due to large tongue]
-molars, impacted max canines, and missing premolars
down syndrome
malocclusions angle classifications are based on
AP relationships
most common malocclusion
class I
deep bite and open bite have multifactoiral etiologies
- transitory
- skeletal (genetic)
- neuromuscular imbalance (oral habits and anterior tongue position)
- combination (sleep apnea)
