COMPLETE DENTURES – OVERDENTURES Flashcards
overdenture
gains its support partly or whole from the roots of retained and decoronated /crown modified teeth or implants
advantages of overdentures
retained toot preserves associated alveolar bone
root face gives extra support therefore reducing bone resorption elsewhere
additional retention can be gained via attachments (ball or magnetic)
psychosocial benefits
retained proprioception and tacile discrimination
what happens when teeth or roots are extracted
alveolar bone loss
md is significant
roots retained allows preservation of PDL (allows proprioception)
disadvantages of overdentures
attatchments are expensive
time taken to plan and place
root prone to caries and periodisease
ongoing root maintenance cost
why are roots more prone to caires and periodotnal disease
plaque retention and reduced saliva flow
increases risk of perio disease
indications for overdentures
when alveolar resopriton will be detrimental
when extractions contraindicated
when increase of occlusal faceheight is essential
when poor adaptation to dentures is expected and additional retention is desirable
when are extractions contraindicated
MRONJ
uncontrolled diabetes
certain blood dyscrasiais
renal disease
intraoral pick up of magnets
magentic pull holds it against root face attattchment
use of chairside PMMA attatches magnet to denture
tooth selection- selecting suitable abutment teeth
sinple root canal shape for endotontics
root length
rubber dam able to place
avoid teeth with sig soft tissue undercuts
what are the ideal abutment teeth - why
canine teeth
bilateral support beneficial
long roots
easy endo
position provides good resistance to tipping and rotational forces
undercuts
difficult to place flange without soft tissue trauma
types of overdentures
immediate
transitional
permanent (
what are transitional overdentures used for
assess pt compliance with OHI and diet
assess tolerance to increase OVD in wear cases prior to committing to permanent cast metal denture
Permanent overdentures
cast metal baseplates and retentive elements can be incorporate
precision attachments and implant
gold copings to aid retention
when is implant retained overdentures indicated
restoration of edentulous md with conventional denture no longer most appropriate first choice prosthodontics treatment
attachment retained overdentures
intracoronal retention within teeth - houses male component
female in the acrylic baseplate
gold copings
not decorination
can protect retained abutment teeth from caries
height and shape improves retention
improves resistance to lateral movements of the denture
- adds on height when OVD needs to be increased
overdenture problems
endodontics
overprepared abutment teeth
overprepared abutments
fractured acrylic onlays
fractured acrylic onlays
acrylic less than 2mm prone to fracture
metal should be used if less than 3mm of interocclusal space
causes by excessive occlusal forces
ongoing management of abutment teeth
monitor for caries OHI ect
vitality rest and radiograph annually
apply F- varnish each review
