Q1, E1 L3b FMC, 4 Tissue Mgmt, 4b Impress, 4c Cast,Dies Flashcards
Crowns are EXPONENTALLY more _____ and _____ than partial crowns.
retentive and resistent
What are the 4 materials we discussed for a crown build up?
amalgam (Dr. P’s preference)…G.I…..Composite resin…Cast Gold
When viewed with ______ from a distance of ___ inches, all the axial surfaces of a preparation with an ideal taper or angle of convergence of 6 degrees can be seen.
one eye…12 in
Cool features that can be used in a FMC prep: Functional Cusp Bevel for
structural durability
Cool features that can be used in a FMC prep: Seating groove for
retention and resistance
Cool features that can be used in a FMC prep: Planar occusal reduction for
structural durability
Cool features that can be used in a FMC prep: axial reduction for
retention and resistance
Reading the BURS: Green
Coarse
Reading the BURS: Red
Fine
Reading the BURS: What does the 6 at the beginning of 6856.016 indicate?
coarse
Reading the BURS: What do the last 3 digits indicate in 6856.31.016?
widest diameter = 1.6mm
What does the “8” in 8856.012 stand for?
Ultra Fine
Packing instruments: ________ heads: commonly used with braided cords as the fine serrations on the head of the instrument sinks into the braided cord and keep it from slipping off
Serrated circular
Packing instruments: _________ heads can be used to place and compress twisted cord with a sliding motion
Smooth, non-serrated circular
A minimum of ____ mm thickness in the sulcus area has to be maintained to make an undistorted impression with polyvinyl siloxane impression material….Requires at least ___ minutes of retraction
0.2 mm…4 min
Non-impregnated cord: Mechanically stretches the __________ periodontal fibers
circumferential
What are the 4 types of impregnated cord? WHICH cord turns the gingiva orange?
1.Epi 2.Al SO4 3.Ferric Sulfate (orange) 4.Al Cl
Which cord causes more damage to the tissue? impregnated or non?
non-impregnated causes damage and pain
What type of Epi has emerged as the most popular to put in the impregnated cord?
8% racemic epinephrine has emerged as the most popular chemical for gingival retraction
Which cord is contraindicated with PVS because Inhibits settting???
Aluminum Chloride!
In the 2 cord technique: The first cord placed is the ______, however, select the ______ cord that will fit below the finish line
smallest…largest
What is the situation that Displacement Paste is not a good option to retract the gingiva?
less effective with very sub gingival margins
What are the 3 requirements when doing electrosurgery to show your margin?
1.NO nitrous oxide (flammable) 2.NO pacemakers 3.Need MOIST environment
What type of mirror do you have to use with electrosurgery?
plastic mirror
Er:YAG laser is not as good at hemostasis as ____ laser
CO2
Whats the main downside to rotary curetteage?
causes lots of bleeding
Malone and Manning found no difference in healing between conventional surgery and ___________.
electrosurgery
There are circumstances in which it may be desirable to have a longer clinical crown on a tooth than is present: Length for retention, Violation of biological width, Place margin more accessible for cleaning…WHATS IT CALLED?
Crown Lengthening
When adding impression material around the prep…Syringe wash around prepped tooth while tray is being loaded. Work from _______ TO ______/______ surface. Keep syringe tip within impression material and push material forward
margins to occlusal/incisal
How long do you leave the PVS impression in the mouth?
5 minutes minimum
THERE IS ONLY 1 disinfectant that can be used for ALL the impression materials:
Chlorine Compounds! (1:10 dilution of commercial bleach)
The replica of the prepared teeth, ridge areas, and other parts of the dental arch
Definitive/Master/Working Cast
PreReq’s for Master Cast: 1. It must reproduce both _______ and unprepared tooth surfaces. 2. The unprepared teeth immediately adjacent to the preparation must be free of _____. 3. All surfaces of any teeth involved in anterior guidance and the occlusal surfaces of all unprepared teeth must allow for precise ________ of the opposing casts. 4. All relevant soft tissues should be reproduced in the definitive cast, including all ________.
prepared…. voids….. articulation… edentulous
The positive reproduction of the prepared tooth and consists of a suitable hard substance of sufficient accuracy
Master Die
Master Die PreReq’s: 1.It must reproduce the _______ tooth exactly. 2.All surfaces must be accurately duplicated, and no _______ or ______ can be accepted. 3.The remaining unprepared tooth structure immediately cervical to the finish line should be easily discernible on the die, ideally with ____ to _____ mm visible (enough must be present to help the technician establish the correct cervical contour of the restoration) 4.Adequate access to the _______ is imperative.
prepared….bubbles or voids….0.5 to 1 mm… margin
Type I Gypsum
Impression Plaster
Type II Gypsum
Model Plaster
Type III Gypsum
Dental Stone
Type IV Gypsum
High-strength, low expansion dental stone
Type V Gypsum
High-Strength, high expansion stone
Plaster is weaker than dental stone due to: 1.) _______ of the particles, requiring more water for a plaster mix
2.) irregular shapes of _____ prevent them from fitting together tightly
porosity… particles
Stone is the α ________ form….Dense, regularly shaped, relatively ________ cuboidal crystal material….require less water, and are approximately ____ times stronger than plaster
hemihydrate… nonporous… 2.5
2 Stage Pour: First Pour is the _______. Second Pour is the ______.
Impression… base
