Quiz 1 - Spring Flashcards

Question

What are the purposes of build-ups?

Answer 1

Enhance connection of indirect restorative material to existing tooth structure Permit creation of ideal retention and resistance form in crown preparation Should help to direct occlusal forces axially Eliminate undercuts to allow line of draw for indirect restoration Reduce volume requirement of the indirect restorative material

Answer 2

If over 1/2 of coronal tooth structure is missing

Answer 3

True. They only enhance the connection. Posts tend to fracture roots, so teeth will last longer if you don't have them, and just because tooth might have already had endo and pulp isn’t vital doesn’t mean that you have to use a post.

Answer 4

False. Opposite

Answer 5

Remaining coronal tooth structure

Answer 6

Casts post have double the fracture strength value, but when they fracture the root, the root is unrestorable ALWAYS, but with prefabricated fiber posts, only 60% of the fractured roots are unrestorable.

Answer 7

PFM, or metal

Answer 8

Defined as from the crown margin up to where the dentin ends, sometimes you prep your crown subgingival to get a ferrule.

Answer 9

Cast post and core with a PFM crown with a 2 mm ferrule

Answer 10

Most of the stress of the post is at the apex near the bottom and that is where a fracture will start, and the posts that were shorter transferred more stress to the apex of the post, so a longer post distributed the stress more easily along the entire length of the post. - Shear stress is usually directed at 135° degrees to long axis of tooth. - Increased post length decreased shear stress at apical end of post.

Answer 11

At least 2/3 to 3/4 the length of the root

Answer 12

Well-adapted, passively luted, parallel-sided post, serrated, tapered apical end

Answer 13

Tapered self-threaded screws will cause stress fracture

Answer 14

1. Bonding the dowel 2. Increasing modulus of elasticity of the dowel 3. Increasing diameter of the dowel 4. Increasing length of the dowel 5. Parallel sided dowels (A dowel is a post)

Answer 15

Lentulo spiral (but not with RelyX Unicem), the needle tube can also be used. And the most reliable results in fiber post cementation are obtained by etch and rinse adhesives, in combination with dual cure resin cements. Self adhesive cements have a lower bond strength than etch and rinse adhesives.

Answer 16

Opposite, you should wait at least 24 hours to get more retentive strength

Answer 17

False, it does, it should be large and fill the post space but not larger than 0.3 mm.

Answer 18

True. But this is the only occasion for this.

Answer 19

1. Preservation of tooth tissue 2. Ferrule effect 3. Adhesion

Answer 20

Post debonding, it is harder to bond to intraradicular dentin than coronal dentin

Answer 21

1. Cemented 2. Friction Locked 3. Threaded

Answer 22

Place at line angles Place 0.5 to 1.0 mm inside of DEJ (1/4 round pilot hole) Hand placement only, don't drive in with slow speed motor You can bend pin if you need to be contained within core of build-up 1/4 round pilot hole Slow speed go halfway, drill out, finish the rest

Answer 23

1. Gates glidden #2 or #3 2. Keep minimum of 5 mm of gutta percha to maintain apical seal 3. Confirm with radiograph if necessary 4. Allow drill to follow path of least resistance

Answer 24

False, DO NOT.

Answer 25

FALSE, SHOULD BE SMOOTH

Answer 26

0.5-1.0 mm

Answer 27

0.5-1.0 mm

Answer 28

1.0-1.5 mm

Answer 29

2.0-2.5 mm

Answer 30

1.0-1.2 mm

Answer 31

1.0-1.2 mm

Answer 32

1.5-1.7 mm

Answer 33

2.0-2.5 mm

Answer 34

1.5 mm, it is 1 mm at the tip, and 1.25 mm half way

Answer 35

Silicate glass and phosphoric acid

Answer 36

Silicate glass and polyacrylic acid

Answer 37

Zinc Oxide and Eugenol

Answer 38

Zinc Oxide and Phosphoric Acid

Answer 39

Zinc Oxide and Polyacrylic Acid

Answer 40

ZOE + Acrylic Powder + Eugenol (IRM is also called Reinforced ZOE)

Answer 41

ZOE + Al2O3 + Eugenol + EthoxyBenzoic Acid

Answer 42

This is a permanent cement, and they recommend it only be used where mechanical retention is high. It is fairly soluble. Endodontists have used this for doing apicoectomies. Along with MTA, which is the best for this.

Answer 43

1. Zinc polycarboxylate 2. Zinc phosphate 3. Glass ionomer 4. Resin 5. RMGI 6. Polyurethane (Improv) - for implants

Answer 44

A measure of viscosity. Is an issue with powder/liquid formulations. NO powder remnants in mix. You want around 25 micrometers and 1 inch snap off.

Answer 45

Kind to the pulp Quite soluble Good intermediate strength Inexpensive cement Not technique sensitive Acidic Weak chelation bonds to calcium ions of enamel and dentin Not recommended for "permanent" use anymore Unlimited shelf life, low cost, ease of use

Answer 46

``` Long history, has been standard Great compressive strength Very hard and time consuming to mix Very technique sensitive Early acidity can be irritating to pulp Moderate solubility when mixed properly High solubility when mixed poorly Not widely used anymore Mix on cold glass slab to slow exothermic reaction, and in increments to control set and allow for adequate amount of powder ```

Answer 47

Fuji is a glass ionomer luting, liner, filler, or buildup. FujiCEM is a RMGI luting agent. We use FujiCEM 2 and Fuji IX in clinic

Answer 48

It is a RMGI liner

Answer 49

There are several, and there are plain glass ionomer buildup material, fillers, or luting (CEM) agents

Answer 50

``` Sustained fluoride release Less soluble than zinc phosphate Much more soluble than resins Weak dentin bond (3-7 MPa) Tooth sensitivity (low molecular weight acid penetrates dentinal tubules Keep tooth moist, even wet, prior to cementation DO NOT over-dry! They expand after set due to moisture ```

Answer 51

Ketac Cem Plus (weak dentin bond) and Zinc Polycarboxylate (weak chelation bonds to calcium ions of enamel and dentin) and Self-adhesive resin cements (weak bond as well). The first two both have polyacrylic acid as a component of their composition. Ketac Cem Plus has silicate glass and is a GI, and Zinc Polycarboxylate has zinc oxide as well.

Answer 52

Diacrylate resin Silica or glass filler Acidic adhesive (self-adhesive only has this)

Answer 53

1. Acrylic Acid 2. Bis-GMA 3. UDMA

Answer 54

A synthetic resin made of polymers of acrylic acid or acrylates

Answer 55

1. Adhesive 2. Self-adhesive (RelyX Unicem) 3. Esthetic

Answer 56

Usually chemical cure Limited shades Bonds to many surfaces Strongest of bonds Good under metal or other opaque material Suitable for posts, over-tapered, short, or unretentive crowns Very technique sensitive, 10 minute set Remove excess cement during rubbery phase

Answer 57

C&B Metabond Panavia C&B Cement

Answer 58

Phosphoric acid grafted into resin Neutralized as resin sets No need for etching, conditioning or priming surfaces to be bonded Good, intermediate bond strength Not recommended for veneers or feldspathic porcelain bonding Convenient and easy to use Most bond better to dentin than enamel Suitable for gold crowns, inlays, onlays, PFM, high strength ceramic crowns, posts, FPD When light activated, flexural strength and elastic modulus are higher than when only self cured Are associated with less post-cementation sensitivity than traditional crown and bridge cements Exhibit a low incidence of marginal staining

Answer 59

RelyX Unicem Maxcem Elite BisCem SpeedCem

Answer 60

``` RelyX Unicem (self-adhesive resin cement) and FujiCem (glass ionomer cement) RelyX Unicem along with FujiCem is great for cementing crowns, you won’t have sensitivity as long as you don’t dry the tooth. Even though FujiCem has the name Cem behind it, it is a resin modified glass ionomer so you can’t use it with a post, like you can this stuff, because it will expand ```

Answer 61

Use with separate bonding agent Tooth enamel is etched with phosphoric acid in preparation for bonding Can be light cured or dual cured Use light activation whenever possible - dual cured cements typically have increased flexural strength and bond strength when activated with a light Wide variety of shades, including try-in pastes Translucent shades may be sensitive to ambient light Very strong bond, especially to enamel Suitable for veneers, lithium disilicate (e.max), translucent zirconia crowns

Answer 62

Catalysts are used and mixed in when you might have a thicker prostheses and you can’t get a light cure all the way through, but catalysts will make a darker shade around the area, which isn’t ideal.

Answer 63

Calibra RelyX ARC Variolink II

Answer 64

VERIFY FIT OF VENEER • IF CONTAMINATED WITH WATER, RINSE AND AIR DRY • IF CONTAMINATED WITH SALIVA &/OR BLOOD, RE-ETCH INTAGLIO SURFACE WITH PHOSPHORIC ACID FOR 30 SECONDS • THOROUGHLY RINSE WITH WATER • AIR DRY • APPLY SILANE TO INTAGLIO SURFACE OF VENEER • AIR DRY PHOSPHORIC ACID ETCH ENAMEL FOR 15 SECONDS • THOROUGH RINSE • AIR DRY (DO NOT DESICCATE!) • APPLY 2 COATS OF GLUMA OR MICROPRIME (WAIT 60 SECONDS) • AIR DRY (DO NOT DESICCATE!) • MIX AND APPLY PHOTOBOND (DO NOT LIGHT-CURE YET!) • AIR THIN • APPLY BASE SHADE (Calibra) ONLY TO VENEER (NO CATALYST) • PLACE VENEER • REMOVE EXCESS, INCLUDING FLOSSING INTERPORXIMALLY • TACK CURE • REMOVE EXCESS CURED RESIN • FINAL CURE

Answer 65

RelyX Luting Plus and FujiCem 2

Answer 66

Gold crowns, onlays, lithium disilicate crowns, zirconia, PFM, FPD's, but NOT suitable for posts or inlays because of expansion.

Answer 67

1. Eugenol based (Temp-Bond) 2. Non-eugenol based (Zone) 3. Resin based

Answer 68

It can soften them

Answer 69

Good to use if temporizing for a long time. And cleans up nicely, especially from implants. -Kind of an intermediate, not as strong as a flowable, but stronger than these other cements, but one downside to this is that it does bond to a build-up made of resin. Improv is a polyurethane resin based temporary cement.

Answer 70

Post length

Answer 71

True. Posts that are 3/4s the length of the root offered the greatest rigidity and least root deflection (bending)

Answer 72

Tapered posts

Answer 73

Apex of the canal preparation