Final Exam Flashcards
RP-4
Overdenture with ONLY implant support
RP-5
Overdenture with implant AND Tissue support
Locators
Class 4
Vertical and Hinge
resilient
40 degree divergence
Zest
favored by most dentists
easer than ERA
more retenttive than ERA
VERTICAL RESILIENCE = 0.2 MM!
ERA
Class 5
Rotational and Vertical
resilient
VERTICAL RESILIENCE = 0.4 MM!
Accurate impressions require…
- well designed impression tray
- adequate rigidity
- appropriate loading of tray
- accurate placement/seating of tray
- appropriate viscosity of impression material
Impression trays:
shouldn’t alter __________
don’t restrict ___________________
properly supports __________________
patient anatomy
orofacial movement
impression material
Goals of MMR appt
- Determine esthetic, functional, phonetic teeth placement
- record MMR i CR at appropriate VDO
- record facebow
- select shade and begin tooth selection
Locator attachment requires only ______ mm of vertical height for both male/female components
3.17 mm
Pt has very ltd vertical space, what is best choice for connecting bar retained by dental implants for supporting prosthesis completely?
VKS-SG / Hader bar
space required for Hader bar and clip from ridge to opposing dentition
11 mm
Space requirement factors for potential attachment usage:
- vertical height space needed for various attachments
- vertical resilience (height of housing) in available space of denture base
Maintenance factors to consider for attachments:
- how easy to adjust retention
- ability to replace worn parts
Krol definition of attachment:
A mechanical device which contributes to the Fixation, Retention, Stabilization, and Support of a dental prosthesis.
2 ways to improve prognosis of abutment:
- MINIMIZE TORQUE / tipping force by directing force down long axis of tooth
- MAXIMIZE AP Spread
6 Advantages of Overdenture:
- Retention
- Bone Preservation
- Stability
- Support
- Cleansability
- Mastication efficiency
Greatest benefit of overdenture over patient’s lifetime?
bone preservation
Primary advantage of facebow mounting of Mx cast?
get relationship of ARTICULAR EMINENCES to mx arch
Keys to good Final impresion:
- WELL ADAPTED impression tray
- Doesn’t alter pt ANATOMY
- Doesn’t restrict OROFACIAL MOVEMENT
- supports IMPRESSION MATERIAL - adequate RIGIDITY
- appropriate LOADING of tray
- accurate PLACEMENT/SEATING of tray
- appropriate VISCOSITY of impression material
Why use open tray on edentulous pt?
to impress a flabby ridge
Characteristics of Impression Tray for accurate final impression:
- WELL ADAPTED impression tray
- Doesn’t alter pt ANATOMY
- Doesn’t restrict OROFACIAL MOVEMENT
- supports IMPRESSION MATERIAL - adequate RIGIDITY
- appropriate LOADING of tray
- accurate PLACEMENT/SEATING of tray
- appropriate VISCOSITY of impression material
How to achieve selective pressure impression?
Apply pressure on primary load-bearing areas of denture and relieve “relief” areas.
Impression tray used for functional/walking impressions?
existing denture
Advantages of Accudent (irreversible hydrocolloid) Impression System?
-non-slumping
-premeasured packets
-syringe delivery
-temperature controlled
-well-designed trays
Is Accudent good technique for FINAL impressions?
No, bc poor dimensional stability and technique sensitive.
Massad’s basic principles for good impressions:
- impression should extend to include entire denture foundation, both supporting and limiting tissue
- impression borders should be identified using functional movement
- adequate space for impression material within impression tray
- guiding mechanism used to accommodate correct position of tray to ridge and tissue
- tray and material made of dimensionally accurate and stable materials
- impression contours and dimensions should replicate intended contours and dimensions of planned complete dentures
Massad requirements for stock edentulous trays:
- adequate rigidity
- sized appropriately
- permit additive and subtractive border modifications
- tray handles exit mouth without disturbing relaxed lips
- retain impression material in tray
2 purposes of tissue stops
- positioning when re-inserting tray
- tissue relief for impression material
Pt comes to you complaining of speech problems, wyd?
Have them read the different fricatives until you knew which one(s) were wrong. If addition is needed to the denture use occlude spray on the palate and then repeat the fricative you are having a problem with. Attempt to alter the palate (anterior or posterior depending) to fix the problem by either adding or removing acrylic.
Describe phonetic testing from article:
Make a palatogram by using occlude spray to mark the palate of the denture. Then put the denture in and have them speak the fricative that is a problem and immediately take it out and look at it. If they have a lateral lisp, it will be a dry spot in the area of the canine/first premolar. If they have a whistle, there will be a dry spot larger than normal in the anterior. Whatever spot you determine needs acrylic added, add a thick mix of Coe Soft impression material there, place the denture in the mouth, have them repeat words with that specific fricative for several minutes until the material is set. Remove the denture, surround everything but the coe soft with class 3 stone, Vaseline the stone, then pour mounting plaster into the key space. Remove the plaster when set, remove impression material from denture, place self-polymerizing acrylic, and replace the plaster key until set. Then polish and return to patient to try in.
“This technique uses a palatogram as a diagnostic tool, a dynamic impression of the tongue, and autopoly- merizing resin to reproduce the functional palatal contours of a maxillary complete denture.”
