Reline and Rebase Flashcards
Resurfacing teh tissue of a denture base with new material to make it fit underlying tissue more accurately.
Reline
Replacement of the entire denture base with new material.
The denture teeth may also be replaced.
Rebase
Done when they don’t like the color of the gingiva, for example.
Where are rebases done?
ONLY in the lab.
Clinical changes seen in someone who wears a denture and has ridge resorption.
1 ) .Decreased VDO.
2) Overextended denture borders as a result of losing ridge support.
3) Horizontal shift of dentures.
4) Irritated/abused tissue.
5) Change in occlusion (due to settling of the prosthesis).
6) For an RPD: decreased support from the distal extension base.
Indications for a Reline
- Poor retention, support, or stability.
- Excessive over or underextended flanges.
- Fracture of denture base.
- Abused tissue.
The decision to reline assumes that:
1) Appearance of teeth is acceptable.
2) Teeth are in an appropriate position.
3) Minimal wear of teeth.
4) VDO is correct or can be corrected with occlusal adjustments.
5) Centric occlusal contacts are acceptable or can be corrected.
Teeth that are very worn down are a contraindication for what?
A reline
Used to take the impression for a lab reline.
Existing denture used as a custom tray.
What is the closed mouth technique?
You insert the tray to take the impression, and have the pt bite down in CR.
- Must maintain OVD and occlusal contacts in CR position during the impression.
- If you need to do occlusal equilibration, do it BEFORE you take the impression.
What do you pour up the lab reline impression with?
MICROSTONE bc if you use jade stone, it will be hard to retrieve the denture after it’s been processed.
T/F: Do NOT separate the impression from the microstone for a lab reline. Just submit the poured impression to the lab.
True
Impression technique when there’s a distal extension RPD with displaceable tissue.
Open-mouth impression
Do you reline the most or least stable denture first if doing two arches?
LEAST stable
How much of the denture intaglio surface do you remove when doing a reline?
1- 1.5 mm
Things to do prior to a reline:
1) Reduce OVER-EXTENDED borders.
2) Correct occlusal disharmonies.
3) Correct pressure areas in the denture.
How often should a temporary reline (coe-soft) be replaced?
Every 2-4 weeks,
How much of the flange area do you remove for a reline?
2-3 mm
Do you do border molding with a lab reline?
Yes
After you take the imrpression for the reline, what are you supposed to mark on the impression?
Postpalatal seal.
Mark it in the patient, re-seat the impression, and it will transfer to the impression.
Pour it up, and it will transfer to the stone.
This component of a partial can be used to evaluate the need for a reline.
The indirect retainer and how it’s adapting to the teeth.
When relining an RPD with a distal extension, where do you place your fingers?
On the indirect retainer.
NOT on the distal extension bc you will be displacing the tissue too much.
This type of prosthesis can be reconstructed instead of rebased.
RPD.
Remove the base and the teeth, and try-in the metal framework.
If the indirect retainer looks like this, you need to do a reline of a partial.
It doesn’t seat all the way when you put finger pressure on the distal extension.
Used to do a chairside lab reline.
Triad DuaLine
This reline technique is useful to increase the postpalatal seal.
Chairside reline.
Don’t use a chairside reline if you need to reline the entire base.
It’s irreversible once it’s done.
Rebasing procedure in the lab or chairside?
ONLY in the LAB!
This impression technique is only used for RPD’s.
OPEN mouth
