interceptive orthodontics Flashcards
What is interceptive orthodontics?
Any procedure that will reduce or eliminate the severity of a developing malocculsion
What problems can be caused by an anterior crossbite?
Toothwear
Gingival recession
Displacement on closure
How are anterior crossbites managed?
URA
Posterior bite plane
Z-spring to tip incisor forwards
Why should posterior crossbites be fixed early?
So permanent dentition will erupt into a normal position
How are posterior crossbites managed?
Maxillary expansion with a URA using a quad helix
Why are increased OJs often treated in the mixed dentition?
Trauma risk
Poor aesthetics - psychosocial problems
What is the aetiology of an increased OJ?
Skeletal - usually class 2, mandibular deficiency most common
Soft tissue - lower lip trap, hyperactive lower lip
Dental - upper incisor proclination, lingual displacement of lower incisors, digit sucking habit
What are the therapeutic effects of functional appliances?
Retrocline maxillary incisors and distalise molars
Procline mandibular incisors and mesialise molars
Remodel glenoid fossa
May enhance mandibular growth and restrain maxillary growth - limited evidence
What are the problems with a reverse OJ?
Displacement on closure
Incisal edge wear
Difficulty eating
Speech problems
Describe the aetiology of a reverse OJ
Skeletal - class 3, hypoplastic maxilla, prognathic mandible
Dental - mandibular displacement, retained upper deciduous incisors
How are reverse OJs managed?
Growing pt - procline upper incisors (URA) or attempt growth modification
Be careful of expected future growth
How can growth modification treat a reverse OJ?
Chin strap/cup
Functional appliance
Protraction headgear
What are the consequences of a deep overbite?
Palatal ulceration
Gingival stripping
How can a deep OB be treated?
URA with FABP
Will allow lower molars to erupt
Pt must be growing to accommodate the increase in OVD
May convert div II to div II then twin block
What are the problems of digit sucking habits?
AOB or reduced OB
Proclined upper incisors and retroclined lower incisors
Increased OJ
Posterior crossbites