L 1-2 Flashcards
general facial form defined by
N A Pg line
Straight profile
skeletal and dental class 1; optimal MMR and relations to cranial base. Includes some convexity at younger ages
Convex profile
Skeletal and dental class II; disproportional MMR protrusive maxilla recursive mandible combo
Concave profile
skeletal and dental class III; Disproportional retrusive maxilla protrusive mandible combo
If maxilla grows down too much
it rotates mandible down and back
Class II maxillary
Maxillary AP or vertical hyperplasia, Mandibular AP hypoplasia
Class III maxillary
Maxillary AP hypoplasia, vertical deficiency, mandibular AP hyperplasia
Mandible surgical procedures
Vertical ramps osteotomy, Bisagital spil osteotomy, anterior and total subs-ical, anterior horizontal osteotomy
Maxillary surgical procedrues
Anterior and poster segmental, LeFort 1, High LeFort (II and III)
BSSO
entirely intra-oral; stable rigid internal fixation possible; usually mandible–> split telescope-advance or set back
can eat soft food after 3 days
BSSO complications
Possible unstable for anterior open bite CC rotation
Potential for IAN injury
50% numbness
LeFort 1 takes advantage
of 3 weak areas of jaw which absorb force to prevent eye brain and vessel damage
through base of nose sinuses and above roots of teeth
LeFort 1 Maxillary segmentalization
Still attached in the back—> soft tissue continues to provide blood supply move jaw put in place and palte
LeFort 1 move maxilla in all planes
Automation of mandible results
stable treatment of anterior open bite
internal rigid fixation possible
LeFort 1 nerves to be cautious
infraorbital
nerve regeneration much more possible in maxilla
