Relines, Rebases, Repair Flashcards
(54 cards)
reline
replacement of the inner 1 mm of denture base
so replacement of the tissue surface only **
rebase
entire denture base is replaced
repair
just about anything
- replacement of teeth
- addition of border
- reposition of broken denture base segments
what differes in reline or rebase?
lab steps
steps to perform both reline and rebase are the same
what must you decide prior to a final reline/ rebase impression
IF THE VDO WILL BE MAINTAINED OR INCREASED
maintain if possible
increase if the occlusion shows signs of ware and loss of vertical
what are signs of repair needed?
several - main ones
- replacement of teeth
- addition of borders - including PPS
- Reposition of broken denture base segments
after assessment of the VDO - what would indicate the need to increase VDO?
- if the occlusion is beginning to show signs of wear and loss of vertical, but still servicable
maximum amount you can increase VDO with rebase/reline?
1-2 mm is MAXIMUM
if 2mm or more is needed – need to remake the denture
what must be done each time border molding is added or the final impression is placed?
A FUNCTIONAL impression technique must be used.
this is known as CLOSED MOUTH POSITION
Before you ever do something to a prostheses?
Check occlsuion with prosthesis and without
adjust CO=CR to establish a STABLE OCCLUSION
then seat the impression for reline or rebase TO THIS OCCLUSION
steps for reline or rebase to MAINTAIN VDO
- Reduce the interior by 1mm to make room for the new impression material except for 3 tissue stops – that are placed at the current vdo!!
location of tissue stops
- anterior - but not on incisive papilla
- 2 in the posterior – but anterior to the tuberosities on upper or retromolar pads on lower
* need to have sufficient room for final impression material and do not want to increase the VDO with material
in prep for reline or rebase what do you reduce or remove
REDUCE – denture border by about 2-3 mm to allow for compound border molding (think as if it as a record base and taking final impressiosn)
- REMOVE – any tissue conditioner or old reline material and freshen up the denture base for mechanical adhesion
steps for reline or rebase to INCREASE VDO
add grey or green tissue stops to the apprpriate vertical.
MAX of 1-2 mm
put them in same locations
1. at anterior offset of incisive papilla and
- two in posterior but anterior to the tuberosity on maxilla and rmp on lower
once establish the vertical … then what
reduce the borders – treat it like it is an existing custom tray and border mold FUNCTIONALLY (IN OCCLUSION) place compatible adhesive and let it cure before taking impression
after you border mold FUNCTIONALLY (in occlusion) then…
make the final impression using MUCOSTATIC impression material such as light boddied rubber base
CR record in reline rebase?
YES — after the impression is set you trim flash and re-seat in order to take CR with Auluwax to ORIENT the denture
what holds vertical/ VDO during reline/rebase
- articulator = pin
- jig = leveling screw
both flask and jig require an occlusal index
when reline/rebase the upper what must you do?
technique?
step after?
SCORE the post dam – drawn on impression because a cast does not yet exist – after separation - then we can put onto cast
this is a mechanical post dam technique and must document the tissue depths so cast can be scored AFTER FLASKING
then bead box and pour
when do you separate after beading and boxing?
AFTER FLASKING because the vertical has not yet been held!!!
if rebases - most of the time it will be placed where?
FLASK
importance of the land of the flask?
HOLDS THE VERTICAL - just like a pin does on articulator.
so the land of flask acts as a vertical stop.
after and occlusal index is made what can be done?
CAN SEPARATE CAST FROM DENTURE – + impression between upper and lower can be made
postdam cut into flask when?
AFTER FLASKING AND BOIL OUT
BEFORE NEW ACRYLIC IS PACKED .
