Amalgam and Composite Questions PDF

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Questions about amalgam and composite...

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AMALGAM                        

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The phase that is eliminated in a high copper dental amalgam: Gamma 2 The weakest and most corrosion susceptible phase of the amalgam. Gamma 2 What principle of cavity preparation influences the cavity depth? Resistance form Most detrimental to the strength of a posterior tooth in cavity preparation is an increase in: Faciolingual width The type of amalgam that contains irregularly shaped alloy particle, sometimes combined with spherical shapes: Admixed amalgam A characteristic of spherical alloy is: Require less mercury The tooth most likely to have a pulp exposure if the pulpal floor is established perpendicular to the long axis of the tooth is: Mandibular first premolar Placement of intermediary bases in a cavity preparation influences the: resistance form A small enamel bevel of the cervical floor: protects the very short gingival enamel rods from fracture during condensation A small enamel bevel: protects the very short gingival enamel rods from fracture during condensation Two adjacent cavities involving proximal contact can be prepared and restored with an amalgam restoration at one appointment for this reason: restoration of contact enhanced The largest component of dental amalgam is: Silver Contact areas are always carefully restored in order to: protect the gingival tissue The percentage of copper component present in High copper amalgam: 13% The percentage of silver component present in a typical High copper amalgam: 60% The function of sliver in the setting reaction of dental amalgam are: Increase strength and corrosion resistance High copper dental amalgam is superior over other amalgam because: there is less marginal breakdown A small enamel bevel: Protects the very short gingival enamel rods from fracture during condensation This feature of cavity preparation facilitates access to tooth preparation and restoration: Convenience Form A set Dental amalgam is strongest in the following property: Compression What is the major difference between the Class V cavity preparation for amalgam and one for composite resin by the acid-etch technique? : Angulation of the enamel cavosurface margin How should the margins of a dental amalgam restoration be trimmed? by carving along the margins with a sharp instrument that rest on the tooth surface The pulpal floor of a class 1 occlusal cavity for amalgam should be: at least 2.0mm in dentin After the dentist have completed preparation of a Class II for amalgam restoration, the preparation becomes contaminated with saliva. In response, the dentist should do which of the following: blow away the saliva with air, then proceed with the basing./ Rinse away the saliva with water, dry, then proceed with the basing In a Class V amalgam preparation for an incipient lesion, the ideal internal form of the preparation has which of the following feature: The occlusal and gingival walls converge The ideal clearance between the adjacent tooth proximally when preparing a Class II amalgam: 0.5 mm Cuspal reduction decreases : resistance form Cavity that commences on the gingival third and extends on the buccal pit of a mandibular first molar : Class 5 Which of the following is the most effective way to reduce injury to the pulp during a restorative procedure? Prepare dentin with light pressure and frequent irrigation The marginal configuration of the cavosurface of the cavity preparation for dental amalgam is: 90 degrees or greater The type of amalgam which has the ability to reduce the effects of the corrosion: Admixed Amalgam / high copper amalgam An increase in the residual mercury in Dental Amalgam will result to: Decrease in strength Cutting for immunity or extension for prevention is under: Outline form In a class 2 prepared cavity for amalgam, the axiopulpal line angle is beveled or rounded principally to enhance the restoration by: Minimizing undesirable stress patterns during function A set Dental amalgam is strongest in the following property: Compression In a preparation of a cavity for restoration with amalgam, all cavosurface angles should be: right angled In preparing a Class I cavity for amalgam, the dentist will diverge the mesial distal walls toward the occlusal surface. The divergence serves to: Prevent undermining the marginal ridges In a lingual pit cavity, the wall that does not exist is the: Pulpal The phase of amalgam that corrodes the least. gamma The Minimata Convention banned the use of the Wet Technique in Dentistry.- False Dispersalloy is an example of a non-gamma 2 amalgam.- True Amalgam can be used for the following clinical procedures except: None of the above In preparing an amalgam preparation, the enamel margins must be left in form of___ 90 degrees or greater All are the advantages of complex amalgam restoration except: Tooth anatomy All are outline forms of Class V Restoration except: Albanian Hat Minor contamination of an amalgam during the insertion procedure may not have as adverse an effect on the final restoration as the same contamination would produce for a composite restoration. True

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It was added to conventional amalgams as a processing to suppress oxidation of the key elements in the allow. Zinc It happens when an amalgam is in direct contact with an adjacent metallic restoration such as gold crown. Galvanic corrosion It contains small, round alloy particles that are mixed with mercury to form the mass that is placed into the tooth preparation. Spherical Amalgam It contains an irregularly shaped and sized alloy particles, sometimes combined with spherical shapes which are mixed to form the mass that is placed into the tooth preparation. Admixed Amalgam

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All are advantages of Amalgam restorations except: Non-esthetic It typically involve a dispersed phase of filler particles distributed within a continuous phase. Composite What is the meaning of BIS-GMA? Bisphenol-glycidyl methacrylate All are advantages of composite restorations except: Have a higher linear coefficient of thermal expansion All are indications of composite restoration except: None of the above All are other terms of composites except: Compomers Composite restorative materials consist of a continuous polymeric or resin matrix in which inorganic filler is dispersed ; True Composites perform best when all margins of the tooth preparation are in dentin - False

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Box-only tooth preparation can be used in Class II composite restoration True

At what period does delayed setting expansion of Dental amalgam occur? 1 hour after placement / 6-8 hours after placement/ 3 hours after placement This is an Amorphous Calcium Phosphate containing composite which release calcium and phosphate ions into the saliva. Smart Ceramics / Self Healing Composite / Smart Composite Use of an increased amount of mercury in the alloy/ mercury mix is called: All of the choices given are correct: All of the choices correct (soft mix, wet technique) Since glass ionomer materials are said to mimic the behavior of dentin, it can be considered as a smart behavior. - True soft skill is the innate or personal strength in problem solving - True One of the required skills a person must posses when evaluating for the best solution is: collaboration / prioritizing / time management The following are the required skills that a dentist process when generating intervention except for: Brainstorming , Prediction , ( team work ). This step in problem solving have systems in place to ascertain if treatment is working. assessing the effectiveness of intervention This step in problem solving will require one to gather and evaluate data, isolate contributing circumstances, pinpoint what needs to be addressed - analyze

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COMPOSITE Hydrophobic material consisting of an inert glass and polymerized resin : Composite Resin In a Class IV restoration, it is important to measure the interdental space as well as the teeth to be restored to ascertain the midline after restoration. – True The most attractive smiles possess teeth of a certain length to width ratio for the two front teeth - True Type of composite that is also known as the Polishable composite – Microfilled Which type of composite resin has the highest percentage of filler by weight? Hybrid The higher C-factor the lower the potential for bond disruption due to polymerization shrinkage. – False This incremental technique in composite restoration greatly reduces finishing time - Successive cusp Build-up Flowable composite resin has an average polymerization shrinkage of 5%. – True Composed of hydrophilic monomers usually carried in a water-soluble solvent (acetone, ethanol, water) to promote good flow and penetration into hydrophilic dentin, which can influence the resulting bond strength. - primer The component which provides a chemical bond between two dissimilar material: - coupling agent This component contributes to high shrinkage and exothermic reaction of composite resin. - Resin Matrix / filler Due to the particle size of this composite resin, quantum loss of its filler usually occurs. – Macrofilled The filler size of a Microfilled composite is: .01 to 0.1 um The filler size of a macrofilled composite is – 0.1 to 1um Filler size of nanofiller is: 0.005 to 0.01 um An incremental technique in composite restoration which reduces the gap in the gingival wall - Vertical Layering It is imperative for good gingival health that the cervical aspect of the composite restoration be smooth and continuous with the tooth structures -. True Type of composite resin that divert from using the incremental layering technique. – Bulk Fill

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The composite restoration surface which was not finished and polished showed lower surface roughness than those which was dry and wet finished and polished - True Processed Composites possess limited bond strength – True Polymerization reaction of composite resin is anaerobic - True Dehydrated teeth become darker in shade as a result in the reduction in translucency – True /false

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Example of a principal monomer is Bis-GMA – True What is the effect of oxygen to the surface of composite after curing – Inhibition of polymerization Polymerization reaction of composite is anaerobic – True Component of composite resin which determines the resulting strength of the restoration – Filler Surface hardness of the composite restoration is increased by – dry finishing and polishing Filler percentage by weight of hybrid composite is 80% - True Dry finishing and polishing of composite resin restoration results to – higher surface roughness Type of composite that has large filler particle, rendering the material difficult to polish – Macrofilled

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This resin is known as the Bowen's Resin - Bis-GMA Best time for shade selection is: Before isolation A process in composite resin restoration which improves retention by removing the smear layer: acid etching Flowable composite resin has an average polymerization shrinkage of 5%.- True This is not the preferred preparation design for composite except when the margins are located on the root surfaces or non-enamel areas: Conventional preparation design This procedure in composite resin restoration increases the ability of liquid to wet the surface of the tooth by creating a high surface energy. acid etching / priming Example of photo initiator for composite resin: Lucerin

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This preparation for composite, is primarily indicated for the initial restoration of small, new, cavitated lesion surrounded by enamel and for correcting enamel defect: Modified Preparation Design The most common problem encountered when a no preparation veneer is used as restoration is: Over contoured What is the activating component for visible light cure material? Camphorquinone This component of composite resin controls the reaction of activators and resin mixtures so the material do not spontaneously cure by itself. – Stabilizers What is the layer that is composed of resin, collagen and dentin, which occurs after etching and bonding of the cavity preparation: Hybrid layer This preparation is dictated solely by the lateral extent and depth of the carious lesion or other defects: Modified preparation Type of tooth preparation preferred when replacing existing restoration with composite restoration Beveled conventional design In bleaching of dentin in endodontically treated teeth, composite resin fails to polymerize upon placement on a tooth surface that has undergone bleaching treatment. What is the possible reason for this non polymerization of the composite resin. - Decrease oxygen content in dentinal tissue Which property of composite resin is affected by the size of monomer/resin and amount of filler? Polymerization shrinkage

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Composite resin which has a combination of small and large filler particles that results to improved wear resistance and adequate polishability? Hybrid

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Silanes are coupling agents that are responsible for the bond between - RESIN MATRIX AND FILLER Which of the following greatly affects curing of light activated composite resin? - INCREMENTAL THICKNESS Which of among the following restorations have more potential for polymerization shrinkage - CLASS I The maxillary incisors normally have: Distal labial tilt This component of composite resin controls the reaction of activators and resin mixtures so the material does not spontaneously cure by itself. Stabilizers Which property of composite is affected by the size of monomer/ resin and amount of filler: Polymerization shrinkage What is this layer that is composed of resin, collagen, and dentin which occurs after etching and bonding of the cavity preparation? Oxygen inhibited layer Example of radio opaquers for composite resins : Iron oxide Example of a principal monomer is Bis-GMA.- True

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