Relining, rebasing, and repairing

Question 1

What is relining?

Answer 1

It involves adding new denture base material to the existing restin to make up for loss of tissue contact causes by resorption of the alveolar ridge

Question 2

The easiest way to evaluate the space under the denture base is to…

Answer 2

place a thin mix of alginate in the denture base area, seat the RPD, and main until aliginate sets

Question 3

The alginate to capture a need for reline must be mixed with an _________ water-powder ratio.

Answer 3

increased
- to have minimal tissue displacement

Question 4

___ scoop of alginate powder mixed with ___ measurements of hot water will provide a mix that is thin enough to not displace soft tissue

Answer 4

1 scoop powder
2 measurements of water

Question 5

If at least ___ mm of alginate is present under the denture base than you can reline/rebase

Answer 5

2 mm

Question 6

If the indirect retainer lifts ___ mm or more than you can reline/rebase

Answer 6

2 mm

Question 7

If the existing denture is short of ideal coverage should you rebase or reline

Answer 7

rebase

Question 8

If there is a bulk of alignate at the buccal shelf area and the crst of the ridge you should…

Answer 8

reline

Question 9

You can evaluate loss of support on the distal extension RPD by applying a seating force on the most posterior aspect of the denture and observing an…

Answer 9

interior indirect retainer

Question 10

If the indirect retainer lifts from its rest seat when applied seating force on the posterior denture base you should…

Answer 10

reline if the space is large (2 mm or more)

Question 11

How do you prepare a resin denture base for a reline?

Answer 11

remove a uniform amount of denture resin from the intaglio surface of the denture base

Question 12

For a reline the denture base resin should be removed for 2 important reasons…

Answer 12

1. space must be created so the impression material will not apply pressure to the soft tissue
2. the surface of the existing rsin must be removed to eliminate potential contaminants and ensure stable bonding

Question 13

What impression material do you use to reline?

Answer 13

If mobile tissue on the crest of ridge use…
- free-flowing, zinc-oxide eugenol

If dense, firm tissue use…
- any of the polysulfride rubber bases, polyethers, polyvinylsiloxanes, and mouth temp waxes

Question 14

Tissue-conditioning material can be used as an impression material for a reline but…

Answer 14

they offer no advantage and can easily distort

Question 15

The most critical step in the reline procedure is the maintenance of the…

Answer 15

tooth-framework relationship during the set of the impression material

Question 16

The patient should or should not bring teeth into contact during the impression making procedure?

Answer 16

SHOULD NOT

Question 17

Small defects in the impression can usually be corrected with…

Answer 17

mouth-termperature wax

Question 18

What should be put in the flask in the lab when doing a reline?

Answer 18

The prosthesis to be relined is located in one part of the flask while the replica of the ednetulous ridge is found in the remaining part of the flask

Question 19

Which is better: intraoral relines or laboratory relines?

Answer 19

laboratory relines

• avoid an intraoral reline

Question 20

What is the problem with intraoral relines resins?

Answer 20

they are porous and will lack color stability

Question 21

What is rebasing?

Answer 21

a lab technique in which the bulk of the denture base is removed and replaced using new resin

Question 22

Why is a rebase complicated?

Answer 22

retentive meshwork is buried within the deture base without sufficient relief beneath the mesh to allow for adequate bulk of new resin

Question 23

What are the indications for a rebase?

Answer 23

• denture bases do not extend to cover all of the denture-bearing tissues
• denture base has fractured
• denture base has become irreparably discolored

Question 24

The denture base is _________________ to allow for room for re-adaptation of the borders with modeling plastic

Answer 24

relieved and shortened

Question 25

When the border molding is complete the base is covered with a suitable impression material and then the…

Answer 25

final impression is made

Question 26

What do you do when both the denture base and denture teeth are involved in a situation?

Answer 26

remake

Question 27

How do you repair a fractured denture base?

Answer 27

• pieces are positively related and luted together using sticky wax
• matrix is poured using dental stone
• fracture line is opened using bur and dovetails are prepared for mechanical retention
• resin is added to prepared fracture line
• placed in a heated pressure pot
• excess repair resin is removed using rotary instruments, finished, and polished

Question 28

How do you fix the RPD if a tooth pops out?

Answer 28

• displaced tooth is repositioned in the denture base
• matrix is fabricated using rigid PVS
• diatorics are prepared in bottom of tooth for mechanical retention
• tooth is fixed to matrix using sticky wax
• denture base is relieved to permit placement of at least 2mm of repair resin
• resin is placed into the prepared space
• polymerize in heated pressure pot
• remove excess resin