Dental Relapse and Adults Flashcards
What are two major causes of orthodontic relapse?
1-Continued Growth
2-Tissue rebound
Active retention takes what two forms?
1-extra oral force in conjunction with retainers (head gear)
2-Funcitonal appliance
Which fibers keep teeth in contact and do not have an osseous attachment?
Periodontal Trans-septal fibers
What are two ways to deal with tissue rebound?
1-Over treatment
2-Adjunctive periodontal surgery
How much should you over treat class II, II or crossbite in order to overcome tissue rebound relapse?
1-2 mm
What are the 3 most popular types of retainers?
1-Hawley retainer
2-Clear essix
3-Bonded permanent retainer
What two types of bone can be identified according to pattern of collagen forming in osteoid?
1-Woven (haphazard organization)
2-Lamellar (parallel alignment)
*12 weeks for woven to mature to lamellar
How long does reorganization of the PDL take?
3-4 months
*Full time retainers during this time.
Which procedure involves cutting down to the crest of the alveolar bone around the labial and lingual gingival margins to sever periodontal fibers?
Circumferential supracrestal fibrotomy (CSF)
*alternatively, incisions through the papilla can be made
Severing periodontal fibers is most effective in reducing relapse of what?
Rotated teeth
A frena that is attached too closely to the gingival margin can cause what?
Gingival recession
*Also midline diastema
What are 6 benefits for adult orthodontics?
1-Cleansability 2-Correct osseous defects 3-Esthetics 4-Force eruption 5-Gingival embrasure correction 6-Improve spacing for implants
What hard to cleanse feature forms as the second molar drifts into the edentulous space where the first molar once was?
A pseudopocket
*ortho can correct this to make it more cleanable and restorable
_____ crown movement leads to increase space for implants and bridge while _____ root movement reduces space
Distal
Mesial
What is the likely cause of slow progress in the movement of molar uprighting?
Occlusal interference
What scenario of uprighting adult teeth will require a different approach and more time?
If both second and third molars need to be uprighted
What might need to be done if the patient needs a crown uprighted but has a steep mandibular angle?
Crown reduction to align with occlusal plane
Which type of periodontal defects can be improved with orthodontics?
1 wall and sometimes Two wall
*not used for 3 wall defects
How long after a bone graft can ortho be started?
6 months if the area is stable
Rather than using anatomy, what is used to determine bracket placement in adult patients?
Inter proximal Bone level
What bone level related lesion is the most difficult to maintain and can worsen during ortho?
Furcation lesions
*2-3 month recall schedules
Crown lengthening surgery should be done prior to orthodontic intrusion to achieve how much ferrule?
at least 1.5 mm
What is the typically freeway space?
2-4 mm
How does the bone and gingiva typically react to slow extrusion?
it follows the eruption of the tooth
*less likely with rapid extrusion but ankylosis becomes more likely
