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Dent 117 Final
| Question | Answer |
|---|---|
| 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
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