COMPLETE DENTURES – OVERDENTURES

Question 1

overdenture

Answer 1

gains its support partly or whole from the roots of retained and decoronated /crown modified teeth or implants

Question 2

advantages of overdentures

Answer 2

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

Question 3

what happens when teeth or roots are extracted

Answer 3

alveolar bone loss
md is significant
roots retained allows preservation of PDL (allows proprioception)

Question 4

disadvantages of overdentures

Answer 4

attatchments are expensive
time taken to plan and place
root prone to caries and periodisease
ongoing root maintenance cost

Question 5

why are roots more prone to caires and periodotnal disease

Answer 5

plaque retention and reduced saliva flow

increases risk of perio disease

Question 6

indications for overdentures

Answer 6

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

Question 7

when are extractions contraindicated

Answer 7

MRONJ
uncontrolled diabetes
certain blood dyscrasiais
renal disease

Question 8

intraoral pick up of magnets

Answer 8

magentic pull holds it against root face attattchment

use of chairside PMMA attatches magnet to denture

Question 9

tooth selection- selecting suitable abutment teeth

Answer 9

sinple root canal shape for endotontics
root length
rubber dam able to place
avoid teeth with sig soft tissue undercuts

Question 10

what are the ideal abutment teeth - why

Answer 10

canine teeth

bilateral support beneficial
long roots
easy endo
position provides good resistance to tipping and rotational forces

Question 11

undercuts

Answer 11

difficult to place flange without soft tissue trauma

Question 12

types of overdentures

Answer 12

immediate
transitional
permanent (

Question 13

what are transitional overdentures used for

Answer 13

assess pt compliance with OHI and diet

assess tolerance to increase OVD in wear cases prior to committing to permanent cast metal denture

Question 14

Permanent overdentures

Answer 14

cast metal baseplates and retentive elements can be incorporate
precision attachments and implant
gold copings to aid retention

Question 15

when is implant retained overdentures indicated

Answer 15

restoration of edentulous md with conventional denture no longer most appropriate first choice prosthodontics treatment

Question 16

attachment retained overdentures

Answer 16

intracoronal retention within teeth - houses male component

female in the acrylic baseplate

Question 17

gold copings

Answer 17

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

Question 18

overdenture problems

Answer 18

endodontics
overprepared abutment teeth
overprepared abutments
fractured acrylic onlays

Question 19

fractured acrylic onlays

Answer 19

acrylic less than 2mm prone to fracture
metal should be used if less than 3mm of interocclusal space
causes by excessive occlusal forces

Question 20

ongoing management of abutment teeth

Answer 20

monitor for caries OHI ect
vitality rest and radiograph annually
apply F- varnish each review