Prostho Flashcards
Obj 1-7 (66 cards)
1
Q
Type I: Luted/Cemented
A
- Restorations fused with metal, gold (inlay, onlays, crowns)
- Simpler steps
- Less appts time required ( Glass Ionomer, polycarboxylate, Zinc Phosphate)
2
Q
Glass Incomer Cement
A
- Most versatile and very popular
- Fluoride release
- low solubility
- Self curing and light curing
- Water and polyacrylic acid
- Variety of applications
- Used for luting (I) cement and core buildups (IV)
3
Q
Bonded
A
Porcelain or ceramic restorations (veneers)
- Bonding is very technique sensitive- More time is required for the appt
4
Q
Resin modified Glass ionomer cement
A
- Hybrid
- User friendly
- Minimal sensitivity
- Fluoride release
- Light cure auto mix
Distilled water and polyacrylic acid
5
Q
Resin Based Cement
A
- Lute and bond
- Better wear resistance
- Available in many color shades
- Acid etch must be applied prior
- Can’t be used for veneers
Light cure or dual cure
6
Q
Zinc Oxide - Eugenol Cement
A
- Used on sensitive teeth, material is soothing and has sedative effect on the pulp
7
Q
Polycarboxylate Cement
A
- Oldest cement
- No sensitivity
- Can be used as long term temporary
- Material full strength after 24 hours, don’t floss or be careful what you eat
- Polyacrylic acid and water
8
Q
Zinc Phosphate Cement
A
- Oldest cement
- Reliable = cast doesn’t come off
- Type I used for cast restorations
- Can cause sensitivity
- Phosphoric acid and water
- Dissipate heat - figure 8 mix movement, cool glass slab
9
Q
Cement removal
A
10
Q
Post Op Instructions Permanent
A
- LA precautions
- Cement setting time
- Tooth sensitivity
- Bite and floss normally
Questions and concerns call the office
11
Q
Stainless Steel Crowns
A
- Used for primary posterior teeth
- Can be trimmed, adapted with contouring pliers and cemented with a high-strength cement
12
Q
Core Buildup
A
Done on a vital tooth to create crown length or support
13
Q
Post and Core
A
a tooth that has a root canal and lacks support and needs to be crowned, a post is placed into one of the filled canals and then a core is built around it
14
Q
Bonding Systems
A
- Also known as dental adhesive which create a strong bond b/w enamel & dentin and restorative materials like composite resin, cements and ortho brackets
-Enhances longevity & effectiveness of procedures
-Ex. Etch, creates rougher surface for better adhesion preventing microleakage
15
Q
Provisional Coverage Indications
A
-Protect pulp from sensitivity
-Maintain periodontal health
-Provide occlusal stability
-Maintain tooth position within the arch
-Protect the margns and preparation from fracture
-Compatible colour with other teeth
16
Q
Types of Provisional Coverage
A
-Custom provisional (temp)
-Prefabricated (lab, Stainless steel crowns)
-Inlay/Onlay
17
Q
Custom Provisional
A
Temporary coverage used for crown and bridge preparations
18
Q
Direct Method: Chairside (Fabricating templates)
A
- Impression is taken chairside before area is prepared
-Alginate material or PVS is used
-kwik trays, triple trays, quadrant trays
19
Q
Indirect Method (Fabricating Templates)
A
-Gypsum model used
-Stent is made prior pt appt
-alginate material, Materials: PVS , plastic resin(clear
stent)
-kwik trays, triple trays, quadrant
trays
20
Q
Polycarbonate crowns (Prefabricated crowns)
A
-Used for posterior & anterior applications
-shell-like crowns only for single unit teeth
21
Q
Cellulose Acetate (Prefabricated crowns)
A
-Thin clear shell available for all tooth types
-Shell is used as a carrier of the provisional material
22
Q
Stainless Steel Crowns (Prefabricated crowns)
A
-Used for primary posterior teeth
-Can be trimmed, adapted with contouring pliers and cemented with a high-strength cement
23
Q
Interim Crowns and Bridges Provisional Criteria
A
-Pulpal/Dentin Protection
-Positional Stability
-Occlusal Function
-Access for Oral Hygiene
-Physiologic Contours
- Accurate Margins
-Esthetics
-Removal
24
Q
Final Impression
A
-Produces the most accurate reproduction of the teeth and surrounding tissue
-Provides essential information: Indirect resto, Implant retained crowns, custom posts, partial or full dentures
25
Polysulfide Impression Material
- A final impression material where elasticity is a requirement. Its a rubber base
- 2-paste systems but use have declined bc of silicone rubber material
26
Polyether Impression Material
- Used as final impression materials for crowns, bridges, inlays, and partial dentures (removable appliances)
27
Silicone Impression material
- no taste or staining properties, and acceptable properties when used properly
- Referred to as polyvinyl siloxane
28
Digital Impressions
-Quick and easy to obtain digital image without mess
-It scans the teeth to capture accurate digital impression
-A 3d model is created afterwards
-This method eliminates distortion
29
Interim Prosthesis is necessary for:
-Reduce sensitivity and discomfort
-Maintain the function and aesthetics
-Protect the margins of the preparation
-Prevent shifting of the adjacent or opposing teeth
30
Indirect (Fabricating Template Methods)
-Vacuum-formed clear stent using a vacuum former
-Allow easy access and visibility throughout the procedure
-Can serve as a tooth preparation guide
-Provide a smooth surface of the interim prosthesis
-can be-cured materials used with self- or light
-Inexpuceensive to prod
31
Direct/Immediate Template (Fabricating Template Methods)
-Impression material and impression tray before reduced in size
-Used template for the provisional material
-Putty Impression
32
Prefabricated crowns (other direct method)
-polycarbonate crown (polymer shell)
-Cellulose acetate (thing clear shell)
-Aluminum and tin crowns
-Stainless steel crowns for primary molars
33
POIG (Prep appt)
-
-Sensitivity, if it gets worse, call office
-Only stays within 90 days
-Chew on other side till anesthetic wears off
-Numbness should last for 2-4hours so Avoid crunchy/sticky foods, chewing on the effected tissues
-Proper flossing technique (floss through)
-If temporary comes off, call office right away
-Salt water rinse if gum feels tender(cord)
34
POIG (Delivery Appt)
-Numbness will last for 2-4hrs, avoid hard/sticky foods and chewing on effected tissues
-Pt can eat right away if anesthetic is not given
-Setting times for cement depends, some might take 24 hours
-Demonstrate flossing/brushing technique
-Permanent restorations require care/routine check-ups
-Show pt restoration
-Parts should include pt is satisfied with the restoration
35
What type of permanent cements are available
-Zincs
-Glass ionomer
-Bonding
36
Types of temporary Cement
-Non-eugonal
-Eugonal
37
What type of impression material will least likely be used to record final impression
Poly Sulfide
-Doesn't smell good
38
What types of retraction methods are available?
-Cord
-Laser (trims gums off)
-Electro surgery
39
What is an articulating cast do?
It stimulates the movements of a pt's jaw. It stimulates the side motions as well
-Determines accurate fit for prosthesis
40
What material contains hemihydrate crystals
Stone
- More crystals, the stronger
41
types of gypsums
1. Impression plaster (Type I),
2. Model plaster ( Type II),
3. Dental stone (Type III) contains a high amount of hemihydrate crystals.
4. Die –Stone ( Type IV)
5. High-strength stone ( Type V)
42
How can Gysum products be stored (environment)
-Dry and cool place to prevent premature setting or degration
- Tightly sealed container to prevent from absorbing moisture (interferes with properties
43
ZOE
- Zinc Oxide Eugenol (Zinc Oxide powder with eugenol liquid)
- Used for temporary fillings, cementation and a root sealer
-
44
What is the organic substance within hydrocolloid materials?
Seaweed
45
How do you dissipate the heat from zinc phosphate during the mixing process
To dissipate the heat, spatulate over a large area of a cool glass slab
46
What is another term for polysulfide?
rubber base
47
What should be placed between the maxillary and mandibular cast when trimming them together?
a wax bite
48
How should polycarboxylate cement appear after the mixing process?
glossy
49
Before an impression is taken with reversible hydrocolloid, where is the material kept?
the material is kept in a conditioning bath.
50
How many appointments are normally required for a 3-unit fixed bridge?
2
51
What dental stone has the least amount of expansion?
high -strength stone
52
What is the difference between an onlay and a three-quarter crown?
An onlay covers most of the occlusal and proximal surfaces; a three-quarter crown covers all but the facial or buccal surface.
53
What type of indirect restoration is placed to improve the appearance of the facial surfaces of teeth?
indirect veneer
54
On what mixing surface is ZOE mixed?
oil resistant mixing pad
55
What is the BEST retention option(s) available for extensively vital decayed tooth?
pins and core buildup
56
What type of material is used for final impressions?
elastomeric material
57
What is the most common wax used to create a pattern for an indirect restoration?
inlay casting wax
58
Error: Impression material has separated from the impression tray and appears dry.
Solution: Too much time has elapsed between the taking of the impression and the pouring of it. The alginate has undergone dehydration, or syneresis. Pour alginate impressions as soon as possible.
59
Error: The surface appears chalky and is soft or crumbly when touched.
Solutions:
The impression was not separated from the poured model within one hour. After this time, the alginate begins to absorb moisture from the gypsum.
The incorrect powder-to-water ratio was used, making he mix too thin. Make sure you weigh the stone and mix with the recommended amount of water.
The impression was not cleaned and dried before pour-up, leaving saliva, blood, food debris, water or disinfectant next to the gypsum.
60
Error: Voids within the anatomy.
Solutions:
Place material at a controlled rate in small increments. Control the rate of flow into each tooth so that air can escape the depression. (Check vibrator speed, quantity of material being added, and angle of the impression on the vibrator.)
Review techniques for reduction of surface tension.
61
Error: Frothy bubbles within the anatomy (over vibration)
Solution: Could be caused by excessive vibrator speed or prolonged contact between tray and vibrator.
62
Error: The base is too thin.
Solution: The base material was dispensed too soon. The material was manipulated too vigorously, causing flow. The impression was pushed too far into the base material. The occlusal plane is not parallel to the counter.
63
Error: Anatomy has been removed during the rough trim.
Solution: Carve a little at a time, occlude and check. Re-carve as necessary.
64
Error: Model is easily broken
Solutions:
The impression was removed before the final set. The impression was pivoted during removal. An improper powder-water ratio was used.
Air has been incorporated into the mix, producing a weakened final product. This can happen due to a poor spatulation technique or due to over vibration. Spatulate the material against the side of the rotating rubber bowl. Always lift the impression off the vibrator as you reach for an additional increment of plaster or stone to add to it.
65
Provisional Dental cements types
-Zinc Oxide
-Eugenol
-non-eugenol
66
Permanent Dental cement types
-Resin-modified Glass Ionomer
-Zinc Polycarboxylate
-Resin cement
