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What are the two types of flexible impression materials?
What is the reversible hydrocolloid?
Agar (no bowl needed)
What is a model used for?
It's a replica to Study oral anatomy.
What is a cast used for?
Working replica used for fabricating appliances.
What is a Die used for?
Working replica of one tooth used.
Which impression material has the least amount of detail?
What is the weakest part of a dental bridge?
How does dental Amalgam set up?
How does impression material set up?
What comes out of gypsum pancakes and what is used for?
Gauging water and it's just a lubricant
What is the One rule for dental materials?
Don't Assume Anything!
How do you remove Alginate?
With a snap
What are thermal conductors?
What is wetability?
Resistance to flow
Which material do you Vacuum form?
What is used to polish a gold crown?
Jeweler's Rouge (iron oxide)
Which liner is universal?
Ca(OH)2; calcium hydroxide
Who does OSHA worry about?
Does Alginate shrink?
How do you mix alginate?
To a homogenous mixture.
How dental implant placed?
A secondary container needs to be used when and have what?
After 8 hours; needs a label that is xeroxed or handwritten.
Which Impression do you do first and why?
Mandibular first, less likely to gag.
Who provides the MSDS and what does it stand for?
The manufacture provides and it stands for Material Safety Data Sheet.
Who and when do you need hazardous training?
New employees, if there are any changes it directions, and when there is new products introduced.
Gypsum is what type of dental material?
How do you place Composites?
They shrink is must place in increments
What material is used for denture to be placed on a Low Alveolar Ridge?
For dentures what material is used for a High Alveolar Ridge?
Which cement is NOT used under composites?
When trimming models what do you start with?
The Maxillary Arch
Can age determine whitening?
When mixing liquid/powder ratio depends on what?
intended use and manufacture instructions
True or False. With Dental Material you want thermal conductivity.
Capacity of restorations & replacements to stay firmly in place.
Force that causes Unlike molecules to attach.
What is Cohesion?
Attraction of same kind of molecule.
What is Tensile Force?
The force moving away
What is compression?
The forces moving into the object
Tensile stress w/o fracture
Bubbling of fluids between solids.
What is casting?
Shaping by melting and forming
What is wroughting?
Shaping by twisting or bending
What is Gypsum?
A mineral CASO4 x 2H2O (calcium sulfate dihydrate)
What are the steps to mixing and pouring gypsum?
- Step 1: 50ml of water in a bowl and sift 100g of plaster and let sit of 5 seconds
- Step 2: wet all powder and then spatculate until homogenous mixture
- Step 3: Zing zing on the vibrator
- Step 4: Pour in one corner using the same corner each time you add some while zinging it on the vibrator.
Characteristics of Plaster
- Dry calcined hemihydrate, beta hemihydrate
- Crystals: spongy, porous, irregularly shaped.
- Low strength
- Low abrasion resistance
- Increased gauging H2O
How do you alter the setting time of Alginate?
By using cold water to slow it down and warm water to speed it up.
What materials have a Exothermic Reaction?
Characteristics of Stone
- Autoclaved hemihydrate
- Alpha hemihydrate
- Crystals: Prism shaped,denser
- Higher strength
- Higher hardness
- Less gauging H2O
Characteristics of High Strength Stone
- Densite, Modified Alpha- Hemihydrate
- Crystals: Spheres, cubes
- Least H2O added
How does plaster and stone set up?
What are some plaster accelerators?
Salt and K2SO4
What are the plaster retarders?
Borax, cold water, and citrate
What are abrasives?
Hard particles that abrade a softer surface (substrate).
- Measures Hardness
- Diamond 10
- Al2O3 9
- Porcelain 6-7
- Tin Oxide 6-7
- Pumice 6
- Rouge 5-6
- Composite 5-7
- Enamel 5-6
- Gold Alloy 3-4
- Dentin 3-4
- Gypsum 2
- Acrylic 2-3
If you increase the liquid/powder ratio of cement it's what?
More soluble, less strong.
What part of an implant protect from bacteria?
What is one thermoplastic?
- stainless steel
Amalgam with Cu
Gives High strength, resistance to corrosion, and hardness
Amalgam with Ag (silver)
Amalgam with Sn (Tin)
Reduces expansion, strength, hardness, and WORKABILITY
Amalgam with Zinc
Bonds can be what?
True or False: Titanium is a reactive material, but not in the body.
What are some ceramics?
- Zinc Oxide
- Glass ionomers
- Silica: SiO2
Which cements bond to the tooth?
- Glass ionomer
- Permanent Luting Agent
- Thermal Insulating Base under deep amalgam restorations
- Uses include Base, Temporary Luting , Temporary Restorations.\
- Soothing, OBTUNDENT to pulp
- Not as strong as ZOP
- Less irritating that ZOP
- Bonds to the tooth
- Used as permanent luting and permanent restorations( comes in blendable shades)
- Fluoride leaches out of the powder into the tooth structure
- Chemically bonds to tooth structure (bonds to Ca++ in the tooth)
- Used for lots of things
Materials placed between the tooth and the main restorative material
What is the most commonly used Liner?
What are varnishes used for?
Seal dentinal tubules
Polysulfide aka Mercaptan
- Smells strong.
- Pour ASAP or at least within 30 min.
Should be poured ASAP
- Cannot wear latex gloves because contact may retard the setting time of the vinyl.
- Should be poured within 2 week
Should be poured within 2 week period