Overdentures

Question 1

Mandibular anterior resorbs approx – times

as fast as maxillary anterior

Answer 1

4

Question 2

Rapid bone loss emphasizes the need for any

procedure which will

Answer 2

slow the bone loss

Question 3

A 5-year study showed that retaining
mandibular canines for overdentures
preserved

Answer 3

alveolar bone

Question 4

overdenture advantages (4)

Answer 4

denture support is increased and soft tissue trauma is decreased
stability of denture is increased
maintenance of periodontal proprioception improves chewing efficiency
psychological benefit to patient

Question 5

more advantages to overdentures (5)

Answer 5

residual ridge integrity-improved stress distribution
stability and retention
patients perception of preserved natural teeth
viable and simple alternative technique to CD
application is virtually unlimited

Question 6

when to use overdentures (3)

Answer 6

 When a conventional denture would have a
poor prognosis
 When opposing an arch of natural teeth
 When “Combination Syndrome” is a factor

Question 7

disadvantages to overdentures (8)

Answer 7

likely time dependent transition to CD, depends on patients oral hygiene and nature of selected abutments
age related inability to follow proper hygiene
caries
frequent recall appointments, expense (endo and restoration)
available interach space
weakness in acrylic denture base
cast coping- increases lab procedures/expenses

Question 8

overdenture disadvantages (4)

Answer 8

 Cost– more $ than conventional denture-
RCT, copings
 Denture is bulkier in some areas
 Denture more subject to fracture
 Caries / perio sequelae

Question 9

selection of abutment teeth (3)

Answer 9

periodontal and mobility status (horizontal bone loss)
abutment location (canines/premolars), at least one tooth per quadrant, no adjacent teeth
endodontic and prosthodontric status

Question 10

endodontic and prosthodontric status

Answer 10

anteriors easy wor endo, in cases of calcification- endo can be avoided
crowns can be modified- sealant/fluoride t/t use of copings, composite/ alloy restorations
retention attachment system

Question 11

Root canal treatment is recommended for

most

Answer 11

overdenture abutments.

Question 12

periodontal evaluation (2)

Answer 12

tooth mobility does not eliminate a tooth for use as an abutment
crown/root ratio is improved (mobility lessened) when crown is reduced on teeth tooth

Question 13

central incisors:
advantages (2)
disadvantages

Answer 13

ideal location, provide protection of the premaxilla

proximity and alveolar prominence may complicate utilization

Question 14

lateral incisors:
advantages (4)
disadvantages

Answer 14

widely separated, facilitating plaque control
tissue undercuts do not pose a problem
path of placement/removal is not compromised
ability to create a flange/peripheral seal

diminished root surface area

Question 15

canines:
advantages
disadvantages (6)

Answer 15

longest root of the anterior teeth

diverging facial tissue undercuts
overcontoured flanges
excessive lip support
potentially uncomfortable placement/removal of prosthesis
complicates placement of prosthetic teeth
internal relief to accommodate canines may weaken, create a food trap, compromise the peripheral seal

Question 16

why are canines most frequently selected? (3)

Answer 16

 Canines have large roots
 Amenable to RCT
 Strategic location at corner of arches

Question 17

Abutment failure –

Answer 17

caries or periodontal

Question 18

Denture fracture –

Answer 18

metal base ?

Question 19

loss of abutment teeth (5)

Answer 19

after 5-6 yrs, about 10% of abutment were lost
causes: periodontal disease, caries, endodontic complications
motivation for hygienic care- mechanical toothbrushes
one tooth overdentures were not tolerated
fluoride gel for daily applicaiton

Question 20

gingivitis around abutment (3)

use of (2)

Answer 20

1. movement of denture base
2. poor oral hygiene
3. excess space in prosthesis (dead space)

use of tissue conditioner
use of hard acrylic resin

Question 21

restorations (2)

Answer 21

 Amalgam

 Cast gold copings

Question 22

flexi-overdenture

Question 23

root attachment

Answer 23

the locator root attachment is a supra radicular design that gives you the choice of a straight post and two angles (10 and 20 degrees) to accommodate divergent roots and a special cast-to version

Question 24

what is required for an implant overdenture?

Answer 24

surgical guide

Question 25

implant bars-

Answer 25

design for hygiene

Question 26

implant-retained, implant supported-

Answer 26

no pressure on the ridge