Dent 117 Final
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| 1:1 ratio; base/liner only; stimulates dentin; mix for 10 seconds; too weak for restorative; no thermal insulative properties | Calcium Hydroxide (Dycal)
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| 1:1 ratio; mix for 30 seconds; short term luting | Temporary cements
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| 1:1 ratio; mix for 30 seconds; glossy; both base/liner; strong; releases floride; bonds well to tooth & restorations | Glass Ionomer
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| 2:1 (luting); 1:1 (base); mix 30 seconds; biocompatible; weak; glossy | Polycarboxylate
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| 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)
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| 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
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| Sedative properties | Eugenol
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| Permanent Luting | Zinc Phosphate; glass ionomer; polycarboxylate
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| Temporary Luting | temp bond; dycal
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| Intermediate Luting | IRM
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| Liner | dycal; vitra-bond
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| Base | IRM; zinc phosphate; glass ionomers
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| obtundent (helps to reduce irritation to the pulp) | IRM (eugenol)
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| varnish | Copolite; gluma; dental bonding agents
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| Class I | pits; fissures & grooves; occlusal surfaces
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| Class II | only posterior teeth; mesial or distal surfaces (flossing surfaces)
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| Class III | Anterior only; Mesial or distal surfaces
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| Class IV | Anterior only; incisal angle
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| Class V | Anterior or Posterior; along gumlines
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| Class VI | Anterior or posterior; cusp tips or incisal edge
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| generally used for amalgams and posterior composites | Tofflemire matrix
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| generally used for composites in the anterior area - may come with or without retainer, may come straight or contoured | Mylar matrix
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| generally used in the anterior area when most of the tooth is missing (peanut shaped) | Shell matrix (Garrison ring)
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| 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)
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| small matrix bands with 'ball ends' | used for primary dentition only
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| size one matrix bands | used for amalgams
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| Mylar strips | used for class III or IV
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| Garrison ring | used for class II
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| Acidity | has a ph of 7; can change by foods eaten; lower ph can cause pulp & gingival irritation
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| Adhesion | holds unlike substances together
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| Chemical adhesion | stronger (cements; composites)
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| physical adhesion | more common (amalgam; plaque)
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| biting forces | 130-170 pounds on molars (25,000 psi)
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| force | pushing or pulling on an object
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| stress | ability to resist the external force
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| strain | change or deformation caused by force
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| pulls/stretches a material (ortho wires) | Tensile
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| material that is able to withstand tensile forces without failing | ductility
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| pushes the material together (chewing or biting) | compressive
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| material that is able to withstand compressive forces without failing | malleability
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| slides across the material (grinding) | shearing
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| changes in metals caused by chemical or electrochemical occurences | corrosion
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| dull & discolored | tarnish
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| change in original length or volume | dimensional change
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| the ability for for a material to distort or deform and then return to orifinal form | elasticity
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| the point it will not return to the original shape | elastic limit
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| continuing deformation of a solid | flow (creep)
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| two different metals create a small electrical shock | galvanism
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| resistance to scratch or indent special instrument used | hardness
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| saliva/food leaks in between the filling and tooth structure | micro-leakage
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| material and tooth surface attach to each other | retention
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| cavity prep holds filling | mechanical retention
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| bonding between tooth and material | chemical retention
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| at what rate does the material dissolve in fluid | solubility
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| the ability of a material to transmit heat | thermal conductivity
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| temp changes cause material to expand & contract | coefficient of thermal expansion
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| ability of a liquid to flow | viscosity
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| ability of a material to flow over a surface | wettability
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| silver, tin, copper, sometimes zinc and mercury | Amalagam composition
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| 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
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| GV Black Class I | Occlusal surfaces, pits, grooves & fissures
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| GV Black Class II | posterior teeth only, mesial or distal surfaces
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| GV Black Class III | Anterior only, mesial or distal surfaces
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| GV Black Class IV | Anterior only, incisal angle
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| GV Black Class V | along gumline (anterior or posterior)
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| GV Black Class VI | cusp tips or incisal edge (anterior or posterior)
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| In the US, standards for dental materials are developed and administered by: | ADA
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| when the temp cahnges in the mouth, the teeth and most restorative materials expand and contract by the same amount - T or F? | Falso
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| When the temperature changes in the mouth, no leakage occurs around the restoration - T or F? | Falso!
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| Calcium Hydroxide is used as a liner - how long is it mixed? | 10 seconds
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| Zinc phosphate is for luting - how long is it mixed? | 1 min 30 seconds - or until you get a 1 inch stretch
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| Glass ionomer is for luting - how long is it mixed? | 30 seconds
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| 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
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| Polycarboxylate is for luting - how long do you mix? | 30 seconds
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| two dental cements that are used for caries control are? | Glass ionomer & ZOE
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| All of the following are true for ZOE except: -releases flouride -lacks strength -an obtundent material -protects the pulp | ZOE doesn't release flouride
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| Which is most soluble? -Glass ionomer -Zinc phosphate -ZOE -polycarboxylate | ZOE
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| when glass ionomer is mixed too slow the mix will be? | thick
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| Cements are _____ soluble than the overlying restoration. | MORE
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| which cement should be mixed on a glass slab because of the exothermic properties? | Zinc phosphate
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| which material promotes secondary dentin growth? | Calcium hydroxide
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| a dental material phase that has no molecular organization and weak atomic bonds between molecules is: -gases -liquids -solids -amorphous | gases
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| a dental material phase that have strong attractions between molecules and can maintain their shape and resist external forces: -gases -liquids -solids -amorphous | solids
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| 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
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| the result of two atoms sharing a pair of electrons is: | covalent bond
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| when placing a liner, you want to place it on which walls of the prep? | Axial & pulpal
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| Name the 5 components of amalgam | silver
tin
copper
zinc
mercury
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| 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
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| 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
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| 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
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| which amalgam metal minimizes oxidation and is about 1% of the composition? | zinc
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| which amalgam metal is very toxic & can enter the body through the pores and inhilation? | mercury
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| amalgam is strongest in ____ strength after it has set? | compressive
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| the most important feature of amalgam success is: - finish & polish - margin seal - economy - ease of manipulation | margin seal
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| mylar strips are used for what class restoration? | Class III
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| materials that are made of large long molecules formed by chemically reacting molcular building blocks called monomers | Polymers
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| chemical reaction that links monomers to produce macromolecules | polymerization
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| molecules with reactive group that participate in polymerization reaction | monomers
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| chemical reaction of acrylic resins | free radicals
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| first step in polymerization | initiation
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| second step in polymerization | propagation
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| ends the growth of monomer chain, last molecules consist of a carbon to carbon bond | termination
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| hydroquinone that slows polymerization | inhibitor
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| composite contains: | -organic polymer matrix
-inorganic filler
-organic silane coupling agent
-radiopaque (zirconium, barium, zinc)
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| tooth prepping debris is known as | smear layer
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| when do you take a shade with the guide? | before isolation and anesthesia
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