Seminar 3 Flashcards
What is the aetiology of an AOB?
- digit sucking
- tongue thrust
- vertical skeletal problem
- intruded teeth
- trauma
- mixed dentition and teeth not fully erupted
What is the limit to treating an AOB with orthodontics only?
- > 4-5mm requires orthognathic surgery
- when using orthodontics only, mini implant screws at 5/6 region are used to help intrude molars
What are aetiological factors in long face?
- reduced muscle tone
- cerebral palsy
- swollen adenoids (mouth breathers)
Why is early use of habit breakers important?
- best used when there is still eruptive potential of teeth to allows spontaneous resolution
- if habit is allowed to progress into adulthood, habit can case permanent skeletal changes
Why is early intervention of a unilateral crossbite important?
- correction in mixed dentition prevents adult dentition erupting in same malocclusion
- stops mandibular displacement and possible TMD
What are prognostic indicators for success of FPM extractions and spontaneous space closure of 7s?
- angle of 7 relative to occlusal plane, more mesial is better
- calcification of the bifurcation of 7s
- 8s present
- age 8-10
What are the guidelines for balancing and compensating extractions in primary dentition?
- royal college of surgeons
- no compensating in primary dentition
- balance C for centreline shift
- balance D if crowding
- no balancing for A B or E (although consider space maintainer for E)
What is the immediate management of an infraocclusion (GDP)?
- if mild, monitor for 6 months with imps and photos
- if moderate in upper or severe in lower, urgent referral required
What is the orthodontic management of an infraoccluded primary molar?
- if successor present, XLA and space maintain (provide URA prior to extraction to ensure compliance)
- if successor not present, refer to hypodontia clinic and orthodontics for opinion
What is the most common aetiology of an infraoccluded primary molar?
- lack of a permanent successor
- crowding causing 5 to become ectopic palatally
Where do the upper premolars develop?
Between roots of primary molars
What is the most common site for an ectopic lateral?
Palatal
What are indications for interceptive treatment in anterior crossbite?
- labial wear of upper incisors
- lingual wear of lower incisors
- mobility of lower incisors
- proclination of lower incisors (can push through alveolar bone and cause labial gingival recession)
- contribution to TMD
What is a good prognostic indicator for correction of anterior crossbite?
Deep overbite ensures retention
What is the aetiology of impacted 6s?
- crowding
- abnormal morphology
- ectopic tooth germ
