orthodontics Flashcards
what is the name of the pliers used for Adams clasps?
Adams 64 pliers
what is the role of the baseplate in a URA?
connects all components together as one unit
provides anchorage
assists with retention
what components on a URA are most likely to be distorted?
buccally placed active components
what controls bone remodelling during orthodontic tooth movement?
the periodontal ligament fibres (PDL)
give advantages of removable orthodontics
excellent anchorage
cheaper than fixed
shorter chairside time
easier to maintain oral hygiene
non-destructive to tooth surface
give disadvantages of removable orthodontics
less precise control of tooth movement
can be easily removed by pt
only 1-2 teeth can be moved at a time
give steps for fitting a URA
- Ensure pt details match details supplied for appliance
- Check appliance matches design specifications
- Inspect appliance & run your finger over all surfaces looking for sharp/potentially traumatic areas
- Check integrity of wirework
- Insert appliance into pt’s mouth, immediately looking for areas of blanching/soft tissue trauma
- Check posterior retention (Adam’s clasp). Firstly flyovers, then arrowheads are correctly engaging appropriate undercuts.
- Apply same principle to anterior retention
- Activate appliance
- Demonstrate to pt correct procedure for insertion/removal of appliance (ensure that pt demonstrates this correctly)
- Book a review appointment 4-6 weeks later
what information should you give to a patient receiving a URA?
bulky
saliva
speech
sore
wear 24/7
clean after meal times
remove for sport
no hard/sticky food
careful with hot food
missed appointments/non-compliance
emergency contact
- appliance will feel big and bulky- this is normal and they will get used to it
- It may cause initial excessive salivation- will pass within 24 hours
- May impinge speech for a short period of time- practise reading a book aloud
- May cause initial discomfort or ache-this is normal and means appliance is working
- To be worn 24/7 including meal times/sleep
- Remove after every meal and clean with a soft brush
- Remove and store in a protective container when participating in contact or active sports
- Avoid hard or sticky foods that may damage the appliance and be cautious with hot food or drinks
- Missing appointments and non-compliance will significantly lengthen treatment time
- Provide emergency contact details in case any problems arise
what component is used to retract canines?
palatal finger springs 0.5mm HSSW
what is the most common retentive component in URAs?
Adams clasp 0.7mm HSSW
give advantages of Adams clasps
can be used on almost any tooth
highly retentive if correctly constructed
small, neat and unobtrusive
describe the checklist for an Adam’s clasp
- Arrowheads must engage mesial and distal undercuts except when tooth is rotated
- bridge of clasp stands clear of tooth at approximately 45 degrees to crown
- Arrowheads are parallel
- Arrowheads should be 45 degrees to tooth surface
- Arrowheads must not touch adjoining teeth
- Bridge should not protrude above occlusal surface
- wire (flyover) fits closely over contact areas N.B. if there is no adjacent tooth present, flyover must cross above contact area
- There should be clearance of 0.5mm-1.0mm between wire and tissue in palate
- There must be tags present at ends of wire to supply addition mechanical retention within baseplate
- gingival margin of any models should only be trimmed if tooth present has not fully erupted
how do you retract buccal placed canines?
buccal canine retractors 0.5mm HSSW + 0.5mm ID tubing
how do you reduced an overbite?
flat anterior bite plane (FABP)
how do you reduce an overjet?
roberts retractor over incisors 0.5mm HSSW + 0.5mm ID tubing
