Ortho - Lecture 18: Relapse and Retention Flashcards
One of the goals in ortho is long term __________
stability
What do the following factors affect?
Alteration of arch form
Periodontal and gingival tissues
Continuing growth
Soft tissue pressures of tongue-lip-cheek
Mesial component of muscular contraction
Mesial component of occlusion
Post-tx stability
Anterior/posterior or lateral increases in arch form usually fail, the dental arch
typically returns to the ____________ shape and size
pre-treatment
How long does collagen reorganization take?
4-6 months
Elastic supracrestal fibers __________ extremely slow
remodel
The observed relapse and subsequent
opening of spaces is believed to be the
result of increased ___________ of gingiva
due to elevated _____________
elasticity; glycoseaminoglycans
T/F: Any skeletal growth may attenuate,
exaggerate, or maintain the dentoskeletal relationship
True
Which growth is last to finish? (ON FINAL)
Vertical
Which growth is first to finish? (ON FINAL)
Transverse
What kind of growth?
Elongation of posterior teeth
Incisor inclination
Growth occurs into late teens
Open bite relapse -> continuation of pre-tx growth; active habits
Deep bite relapse -> common correction; easily relapses w/o retention
Vertical growth
Mutually protected occlusion
Cusp to fossa relationship
Canine guidance
Posterior disclusion on protrusion
Sound functional occlusion
Avoid ___________ expansion at all costs
canine
Retention starts with ____________
diagnosis
Which retainer?
Removable, adjustable, pt compliance
Hawley retainer
Which retainer?
Esthetic, non-adjustable, pt compliance
Essix retainer
Which retainer?
Max settling, reorganization of PDL, passive or active
Wrap around retainer
Which retainer?
Can eliminate < 2 mm of crowding, passive or active
Spring retainer
Which retainer?
Invisible, reduces long term compliance need
Lingual bonded retainer
Which retainer?
Disadvantages include bond failure, hygiene issues, caries, and monitoring by clinician
Lingual bonded retainer
