RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION Flashcards
(28 cards)
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Relapse in orthodontics
Partial or complete regression to pre-treatment condition after orthodontic treatment
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Important Factors in relapse
- The structure and morphology of tissues
- Growth of the facial skeleton
- Motivation of patient
- Motivation of parents
- Professionalism of orthodontist
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Basic reasons for relapse
- Unfinished treatment of the deformation and inability to reach orthognathic occlusion
- Unremoved etiologic factors
- Incomplete diagnosis of the deformation and prediction of results of treatment
- Underestimation of the time necessary for retention
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Two types of relapse
- Early relapse
- Late relapse
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Reasons for early relapse
- Unfavorable growth
- Unadapted muscular balance
- Absence of good occlusion
- Non-compliance with the structure of periodontal tissues
- Hereditary factors
- Unremoved etiologic factors
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Signs of late relapse
- Crowding of incisors
- Reduction of intercanine distance
- Reduction of dental arch length
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
What overall movement is associated with late relapse?
Centripetal movement
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Can cause centripetal forces leading to relapse
- Natural tendency for mesialization of teeth
- Development and eruption of wisdom teeth
- Forward rotation of lower jaw related to growth
- Change in balance between external and internal muscular zone
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Methods for preventing late relapse
- Interproximal reduction
- Splinting in periodontal problems
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Retention
- Stage of orthodontic treatment aimed at preserving final tooth positions achieved through treatment=>
- Stabilize bite and prevent relapse
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Retention period
Duration of time retainers must be worn after active orthodontic treatment ends
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Factors dictating the retention period
- Severity of malocclusion
- Skeletal growth status
- Age of patient
- Condition of the periodontium
- Persistent abnormal oral habits
- Applied forces during treatment
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Types of retention
- Self-retention
- Short-term retention (up to 1 year)
- long-term retention (from 1 to 5 years)
- Permanent retention
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Factors for self-retention
- Crossbite w/ adequate coverage in anterior segment
- Posterior crossbite w/ satisfactory maximum intercuspation
- Combined prosthetic-orthodontic treatment.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Factors for short-term retention
- Dento-alveolar malocclusion
- Concluded skeletal growth
- Healthy periodontium
- It is done w/ removable retention appliances.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Factors for long-term retention
- Skeletal deformations and unfinished skeletal growt
- Done w/ removable and fixed retention appliances.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Factors for permanent retention
- Periodontal diseases
- Congenital clefts (bilateral)
- Done w/ fixed retention appliances.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Methods used for retention
- Retention appliances (removable and fixed)
- Surgical methods (fiberotomy, glossectomy).
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Requirements of retention appliances
- Dont interfere w/ occlusion
- Dont limiti physiological tooth movemen
- Comfortable
- Aesthetic,
- Allowi oral hygiene maintenance
- Well adjusted to patient’s mouth
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Examples of retainers
- Retention plate of Hawley
- Retention plate w/ continuous arch
- Active retainer (spring retainer)
- Retention appliance of Napadov
- Standard tooth positioner
- Fixed retention appliance of Izard
- Lingual arch w/ bands
- Fixed pre-fabricated retainer
- Ribbond orthodontic retainer
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
What is an advantage of the retention plate of Hawley?
Allows good oral hygiene.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
What are the disadvantages of the retention plate of Hawley?
- Undisciplined patients.
- Wire elements can interfere with occlusion.
RELAPSE AFTER ORTHODONTIC TREATMENT AND ITS PREVENTION
Functions of a standard tooth positioner
- Closes remaining spaces after treatment with braces.
- Corrects light teeth rotations.
- Corrects remaining occlusal problems.
