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Dent 117 Final

1:1 ratio; base/liner only; stimulates dentin; mix for 10 seconds; too weak for restorative; no thermal insulative properties Calcium Hydroxide (Dycal)
1:1 ratio; mix for 30 seconds; short term luting Temporary cements
1:1 ratio; mix for 30 seconds; glossy; both base/liner; strong; releases floride; bonds well to tooth & restorations Glass Ionomer
2:1 (luting); 1:1 (base); mix 30 seconds; biocompatible; weak; glossy Polycarboxylate
2drops liquid:powder as needed; b/l, temp filling; mix 1.5 min to non-sticky firm ball; clove taste; biocompatible; doesn't bind with composites Zinc Oxide Eugenol (ZOE)
dime size pwdr (divide 8x):5-6 drops liquid; acidic; only use if tooth is dead; amalgam compatible; exothermic (use glass block)will stretch 1 inch Zinc Phosphate
Sedative properties Eugenol
Permanent Luting Zinc Phosphate; glass ionomer; polycarboxylate
Temporary Luting temp bond; dycal
Intermediate Luting IRM
Liner dycal; vitra-bond
Base IRM; zinc phosphate; glass ionomers
obtundent (helps to reduce irritation to the pulp) IRM (eugenol)
varnish Copolite; gluma; dental bonding agents
Class I pits; fissures & grooves; occlusal surfaces
Class II only posterior teeth; mesial or distal surfaces (flossing surfaces)
Class III Anterior only; Mesial or distal surfaces
Class IV Anterior only; incisal angle
Class V Anterior or Posterior; along gumlines
Class VI Anterior or posterior; cusp tips or incisal edge
generally used for amalgams and posterior composites Tofflemire matrix
generally used for composites in the anterior area - may come with or without retainer, may come straight or contoured Mylar matrix
generally used in the anterior area when most of the tooth is missing (peanut shaped) Shell matrix (Garrison ring)
5 Parts of a Tofflemire Frame (main body of retainer) Guide channels (slots in the end to hold & direct matrix band) Vise (holds end of band) Spindle (screw rod to secure band in vise) Inner knob (adjusts matrix band size) Outer knob (tightens spindle)
small matrix bands with 'ball ends' used for primary dentition only
size one matrix bands used for amalgams
Mylar strips used for class III or IV
Garrison ring used for class II
Acidity has a ph of 7; can change by foods eaten; lower ph can cause pulp & gingival irritation
Adhesion holds unlike substances together
Chemical adhesion stronger (cements; composites)
physical adhesion more common (amalgam; plaque)
biting forces 130-170 pounds on molars (25,000 psi)
force pushing or pulling on an object
stress ability to resist the external force
strain change or deformation caused by force
pulls/stretches a material (ortho wires) Tensile
material that is able to withstand tensile forces without failing ductility
pushes the material together (chewing or biting) compressive
material that is able to withstand compressive forces without failing malleability
slides across the material (grinding) shearing
changes in metals caused by chemical or electrochemical occurences corrosion
dull & discolored tarnish
change in original length or volume dimensional change
the ability for for a material to distort or deform and then return to orifinal form elasticity
the point it will not return to the original shape elastic limit
continuing deformation of a solid flow (creep)
two different metals create a small electrical shock galvanism
resistance to scratch or indent special instrument used hardness
saliva/food leaks in between the filling and tooth structure micro-leakage
material and tooth surface attach to each other retention
cavity prep holds filling mechanical retention
bonding between tooth and material chemical retention
at what rate does the material dissolve in fluid solubility
the ability of a material to transmit heat thermal conductivity
temp changes cause material to expand & contract coefficient of thermal expansion
ability of a liquid to flow viscosity
ability of a material to flow over a surface wettability
silver, tin, copper, sometimes zinc and mercury Amalagam composition
1. mercury leakage during trituration 2. vapor during dispensing 3. during polishing of amalgam 4. during amalgam removal 5. touching amalgam during procedures potential sources of mercury contamination
GV Black Class I Occlusal surfaces, pits, grooves & fissures
GV Black Class II posterior teeth only, mesial or distal surfaces
GV Black Class III Anterior only, mesial or distal surfaces
GV Black Class IV Anterior only, incisal angle
GV Black Class V along gumline (anterior or posterior)
GV Black Class VI cusp tips or incisal edge (anterior or posterior)
In the US, standards for dental materials are developed and administered by: ADA
when the temp cahnges in the mouth, the teeth and most restorative materials expand and contract by the same amount - T or F? Falso
When the temperature changes in the mouth, no leakage occurs around the restoration - T or F? Falso!
Calcium Hydroxide is used as a liner - how long is it mixed? 10 seconds
Zinc phosphate is for luting - how long is it mixed? 1 min 30 seconds - or until you get a 1 inch stretch
Glass ionomer is for luting - how long is it mixed? 30 seconds
ZOE is used for temp restorations - how long is it mixed? 1 min 30 seconds, but it's a wristbreaker! make a soft, non-sticky ball
Polycarboxylate is for luting - how long do you mix? 30 seconds
two dental cements that are used for caries control are? Glass ionomer & ZOE
All of the following are true for ZOE except: -releases flouride -lacks strength -an obtundent material -protects the pulp ZOE doesn't release flouride
Which is most soluble? -Glass ionomer -Zinc phosphate -ZOE -polycarboxylate ZOE
when glass ionomer is mixed too slow the mix will be? thick
Cements are _____ soluble than the overlying restoration. MORE
which cement should be mixed on a glass slab because of the exothermic properties? Zinc phosphate
which material promotes secondary dentin growth? Calcium hydroxide
a dental material phase that has no molecular organization and weak atomic bonds between molecules is: -gases -liquids -solids -amorphous gases
a dental material phase that have strong attractions between molecules and can maintain their shape and resist external forces: -gases -liquids -solids -amorphous solids
an electron being given up by one atom and being accepted by another atom is: - ionic bond - covalent bond - metallic bond - unheard of ionic bond
the result of two atoms sharing a pair of electrons is: covalent bond
when placing a liner, you want to place it on which walls of the prep? Axial & pulpal
Name the 5 components of amalgam silver tin copper zinc mercury
which amalgam metal determines dimensional changes, increases strength, slow to amalgamate, hardens rapidly, tarnishes easily, decreases setting time and is 40-70% of the total composition? silver
metal in amalgam which aids in chemical bonding, reduces expansion, reduces strength, slows setting time, more susceptible to corrosion, weakens the amalgam and is 22-37% of composition? tin
which amalgam metal increases strength, hardness, increases expansion during hardening, reduces flow of finished restoration, reisists corrosion, reduces marginal failure and is 4-30% of the composition? copper
which amalgam metal minimizes oxidation and is about 1% of the composition? zinc
which amalgam metal is very toxic & can enter the body through the pores and inhilation? mercury
amalgam is strongest in ____ strength after it has set? compressive
the most important feature of amalgam success is: - finish & polish - margin seal - economy - ease of manipulation margin seal
mylar strips are used for what class restoration? Class III
materials that are made of large long molecules formed by chemically reacting molcular building blocks called monomers Polymers
chemical reaction that links monomers to produce macromolecules polymerization
molecules with reactive group that participate in polymerization reaction monomers
chemical reaction of acrylic resins free radicals
first step in polymerization initiation
second step in polymerization propagation
ends the growth of monomer chain, last molecules consist of a carbon to carbon bond termination
hydroquinone that slows polymerization inhibitor
composite contains: -organic polymer matrix -inorganic filler -organic silane coupling agent -radiopaque (zirconium, barium, zinc)
tooth prepping debris is known as smear layer
when do you take a shade with the guide? before isolation and anesthesia
Created by: ColleenB