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FSBGD MCQ Study Questions 2000 | Dental Composite | Dental Material

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Operative 1. In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. 2. 3. 4. a hydrophilic monomer that wets the dentinal surface a hydrophilic resin that forms a “hybrid” layer by chemically reacting the intertubular dentin. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin. a bifunctional molecule resin that copolymerizes to bis-GMA resins. a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4 Correct answer is b. 1,4 I Nakabayashi N, Takarada K. E
  1 Operative 1. In 3 rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is1. a hydrophilic monomer that wets the dentinal surface2. a hydrophilic resin that forms a “hybrid” layer by chemically reacting the intertubular dentin.3. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin.4. a bifunctional molecule resin that copolymerizes to bis-GMA resins.a. 1,2b. 1,4 c. 2,3d. 1,3e. 3,4 Correct answer is b. 1,4 I   Nakabayashi N, Takarada K. Effect of HEMA on bonding to dentin. Dent Mater 1992; 8:125. I   Asmussen E, Hansen EK. Dentine bonding agents. In: Vanherle G, Degrange M, Wellems G (eds). STATE OF THE ART ON DIRECT POSTERIOR FILLING MATERIALS AND DENTINEBONDING . Proceedings Of The International Symposium Euro Disney, ed 2. Leuven, Belgium: Bander Poorten, 1994:33. I   Eliades G. Clinical relevance of the formulation and testing of dentine bonding systems. J Dent 1994;22:73 I   Nikaido T, Durrow MF, Tagami J, Takatsu T. Effect of pulpal pressure on adhesion of resincomposite to dentin: Bovine serum versus salin. Quintessence Int 1995; 26:221 I   Schwartz RS, Summitt JB, Robbins JW, dos Santos J. Fundamentals of Operative Dentistry, AContemporary Approach. Page 166. Enamel and Dentin Adhesion.The objective of this priming step is to transform the hydrophilic dentin surface into a hydrophobic andspongy state that allows the adhesive resin to wet and penetrate the exposed collagen network efficiently.2-hydroxyethyl methacrylate, described as essential to the promotion of adhesion because of its excellentwetting characteristics, is found in the primers of many modern adhesive systems.2. What is the active agent in most home (night guard) bleaching solutions?a. 2-5% carbamide peroxideb. 10 - 15% Phosphoric acidc. 10 - 15% carbamide peroxide  d. 35% hydrogen peroxidee. 5 - 10% citric acid15% CARBAMIDE PEROXIDE 15% carbamide peroxideBRITESMILE TM AT HOME 4% H 2 O 2  CONTRAST P. M. 10%, 15%, 20% carbamide peroxideENCORE HOME WHITENING 10% carbamide peroxideKAIBAB STARBRITE, INC. HOMEBLEACHING SYSTEM STARLITE10% carbamide peroxideNITE WHITE CLASSIC 10%, 16%, 22% carbamide peroxideNITE WHITE EXCEL 10%, 16%, 22% carbamide peroxideNUPRO GOLD 10% carbamide peroxideOPALESCENCE 10% carbamide peroxide  2PLATINUM PORFESSIONAL TOOTHWHITENING SYSTEM10% carbamide peroxideREMBRANDT GEL PLUS 10%, 15%, 22% 10%, 15%, 22% carbamide peroxideTRIO STEP-BLEACHING SYSTEM 11%, 13%, 16% carbamide peroxideVITINT SYSTEM VWHITE & BRITE ULTIMATE 11% carbamide peroxide3. Which rotary instrument gives the smoothest enamel cut?a. carborundum stone (green stone)b. aluminum oxide stone (white stone)c. plain fissure bur d. cross-cut fissure bure. medium diamond bur Correct answer is c. plain fissure bur I   Barkmeier WW, Kelsey WP 3d, Blankenau RJ, Peterson DS, Enamel Cavosurface Bevels FinishedWith Ultraspeed Instruments. J Prosthet Dent Apr 1983;49(4):481-484.Rating scores ranked the straight fissure bur first for producing the smoothest and most distinct bevel.The 40-fluted and 12-fluted finishing burs ranked second and third, respectively, and the superfinediamond stone was judged to produce the roughest and least distinct bevel. In selecting an instrument forfinishing an external enamel cavosurface bevel, the results of this study suggest that a straight fissure burwill produce the most distinct and smoothest bevel and ultrarotational speeds are used.The crosss-sut fissure bur is perhaps more efficient, less chatter. The medium diamond bur actually hasgreatest efficiency but gives the roughest cut.4. The “biologic width” is the distance between theA. Base of the gingival sulcus and the crest of alveolar boneB. Free gingival margin and the base of the gingival sulcusC. Free gingival margin and the alveolar boneD. Free gingival margin and the mucogingival junctionE. Free gingival margin and the base of connective tissue attachmentIn health, the connective tissue and epithelial attachments occupy the space between the base of the sulcusand the alveolar crest and measure approximately 2.0 mm - this is termed biologic width. Ref.Fundamentals of Operative Dentistry Schwartz, Summit, Robbins and Santos pg. 21.Biologic width refers to the combined connective tissue and epithelial attachments from the crest of thealveolar bone to the base of the gingival sulcus and is equal to an average of 2.04 mm. Gargiulo et al.Dimensions and relations of the dentogingival junction in humans. J Periodontol 1961:32:261-7.In calculating the placement of restorative margins, most literature agrees on need for additional 1-2 mmof sound tooth structure coronal to epithelial attachment, therefore, the minimum distance between thealveolar crest and the restorative margin should be 3-4 mm. This allows 1mm for the sulcus. Ref.Clinical Update Vol. 17, No.5.5. When incrementally placing a large composite resin restoration, what effect does an air-inhibited layeron the surface of the first increment have on the bond between the first and the second increments?  3A. It has no effect on the bondB. It is desirable and improves the bondC. It is undesirable and should be removedD. Its presence indicates that the composite requires further light polymerizationE. A layer of unfilled bonding agent should be applied to increase the bondIncremental placement is possible because of a phenomenon referred to as the air-inhibited layer.Polymerization is initiated and progresses because of free radicals that are formed in the resin monomers.These free radicals are highly reactive to oxygen; when they come in contact with air at the surface of thecomposite, an unpolymerized air-inhibited layer is formed. The air-inhibited layer is reactive to newcomposite and forms a cohesive bond to additional increments. Ref. Fundamentals of Operative Dentistry Schwartz, Summit, Robbins and Santos pg. 21.Caputo, J. Pros Jann 1989.6. The powder component of IRM is essentiallyA. EBA with methyl methacrylateB. Zinc oxide with EBAC. Zinc oxide and aluminum oxideD. Zinc oxide and methyl methacrylateE. Zinc oxide and ethyl methacrylateTypical FormulaPowder: Zinc oxide Liquid: EugenolRosin (  brittleness) Olive Oil (plasticizer)Zinc Stearate (plasticizer)Zinc Acetate (  strength)Altered CompositionsPolymer-reinforced ZOE cementPowder: Zinc oxide (80%)Methyl methacrylate (20%) Liquid: EugenolEBA-alumina-reinforced ZOE cementPowder: Zinc oxide (70%) Liquid: ortho-EBA (62.5%)Alumina (30%) Eugenol (37.5%)If EBA is added, it is added to the liquid, not the powder.Methyl methacrylate, not ethyl methacrylate is used.The choice of  zinc oxide and aluminum is debatable . According to Craig, there are some experimentalcements that contain 64% zinc oxide and 30% aluminum oxide in the powder and 87.5% EBA and 12.5% n -hexyl vanillate in the liquid.Ref. Restorative Dental Materials Ninth Edition Craig pg 190.7. If used, in which direction should pinholes be placed?a. parallel to the long axis of the toothb. parallel to the nearest external surface    4c. at a 15 degree angle to the long axis of the toothd. perpendicular to the gingival floore. directly below and parallel to restored cusp tip  Ref.: FUNDAMENTALS OF OPERATIVE DENTISTRY, Schwartz, Schmitt, Robbinspp. 273, Fig. 10-32a“To align a pin channel drill, a non-depth-limiting pin channel drill is alignedparallel to the external surface.”8. Optimum penetration of a .024 or .031 inch self-threading pin in dentin is . . .a. 0.5 mmb. 1.0 mm c. 2.0 mm  d. 2.5 mme. 3.0 mm  Ref.: FUNDAMENTALS OF OPERATIVE DENTISTRY, Schwartz, Schmitt, Robbinspp.271, Fig. 10-29b“Regular (0.031-inch diameter) gold-plated stainless steel Link Plus pin with Regu-lar (0.027-inch diameter) pin channel drill; Minim (0.024-inch diameter) titaniumalloy Link Plus pin with Minim (0.021-inch diameter) pin channel drill (2.0-mmdepth-limiting); “9. High content copper amalgam . . .a. generally requires greater energy to accomplish trituration  b. should be placed rapidly in large incrementsc Continues to leak since the corrosion products do not formd. does not cause galvanism in oral environmente. is equally effective as conventional alloys in clinical studiesrequires greater energy to accomplish trituration. High Cu amalgams 12% to eliminate gamma 2, theADA standard is 9%
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