os- orthognathic surgery Flashcards
List the MDT members involved in orthognathic surgery
Psychologist
Orthodontist
Technologist
surgical
restorative
periodontal
oral hygiene.
Why are study models taken before orthognathic surgery?
To
Study the occlusion
Orthodontic analysis.
Planning
Production of the occlusal wafer
Assessing the surgical changes
Assessing long term stability and relapse.
What does prognathic mean?
Too far forward.
What does retrognathic mean?
Less prominent .
What does progenia mean?
Chin is too far forward.
What does retrogenia mean?
Chin is less prominent/
What does combined orthodontic and orthognathic surgery consist of?
Tooth alignment
Elimination of crowding/spaces/crossbite
Alteration and co-ordination of the arches
Correction of incisor’s inclination (decompensation)
Flattening of the occlusal plane.
Surgical fixation
May require post surgical fine tuning.
What is a le fort I Osteotomy?
The maxilla is cut and repositioned forward/ down or up
What is the main disadvantage of the Le fort I osteotomy?
You cannot move the maxilla back due to the pterygoid plates.
What is an anterior maxillary osteotomy?
This allows you to move the maxilla back
What is a sagittal split mandibular osteotomy?
This splits the ramus to allow us to move the mandible forward or back.
What is the disadvantage of the Sagittal split mandibular osteotomy?
The risk of damage to the IADN
What is the vertical sub sigmoidal osteotomy?
This is when the mandible is cut vertically to move it- so there is less risk to the IADN
What is the disadvantage of the vertical sub sigmoidal ostetomy?
The patient’s teeth have to be wired together for 6 weeks.
