Dental Material Exam 1 with correct answers

What cement is created by mixing glass powder and phosphoric acid? - answer-Silicate What concentration of orthophosphoric acid is commonly used in dentistry? - answer-37% If the etched surface becomes contaminated with saliva, what should the clinician do? - answer-Re-etch for 5 seconds Pulp protection is recommended when the remaining dentin is under ___mm - answer-2 mm Which of the following cements must be mixed on a glass slab? - answer-Zinc Phosphate What is a beneficial characteristic of eugenol? - answer-Obtundent Which of the following statements is TRUE? - answer-- *Hydrophilic chemicals are tolerant of water* - Dentin should not be etched - The smear layer should be left to protect the pulp - Composites irritate the pulp Adhesive materials are commonly: hydrophobic or hydrophillic? - answer-Hydrophobic What is a beneficial characteristic of calcium hydroxide? - answer-Stimulates secondary dentin formation Which of the following is NOT a potential function of a temporary restorative material? - answer-- aid in caries control - a place holder while indirect restorations are made - *can be left and used as a liner under permanent restorations* Which step comes earliest in the amalgam placement process? - answer-1. TITRATION 2. Condensing 3. Carving 4. Burnishing Which class of decay is least likely to be restored with amalgam? - answer-Class III (Or Class IV) What is the term used for amalgam extended past the cavosurface margin? - answer-Flash What is the function of tin in a dental amalgam? - answer-Setting Contraction Which phase of amalgam is the weakest? - answer-Sn-Hg Which of the following is NOT a threat to amalgam restoration retention? - answer-- corrosion -*Insufficient etching* - creep - delayed expansion Reducing the oxidation of the other metals in the alloy is the function of which element in amalgam? - answer-Zinc Mercury toxicity is a present danger to all dental patients, therefore amalgam restorations should be avoided if possible. - answer-False - poses a threat for inhalation What is the most dangerous way to be exposed to mercury? - answer-Inhalation of vapors If a mass of amalgam is excessively dry and crumbly, what is the likely cause? - answer-Overtitration (thick and grainy is undertitrated) Addition polymerization is classified as an endothermic reaction T/F - answer-FALSE it is exothermic Polymerization continues as long as monomers are available to react with the free radicals at the end of a chain. T/F - answer-True A PRR is used to restore caries that only affected enamel surfaces. T/F - answer-True Which composite type contains the highest percentage of filler by weight? - answer-Hybrid Which abrasive would be BEST utilized when finishing the occlusal surface of a composite restoration? - answer-Egg-shaped finishing burr Which type of composite has the lowest viscosity? - answer-Flowable What percentage of polymerization shrinkage is expected when working with composite material? - answer-2% All of the following are techniques to control heat transmission when polishing composites EXCEPT one. Which one is the exception? - answer-- Use of intermittent storkes - use of water - slow speed handpiece - *course abrasives first* When compared to a metal restoration, dental bases appear: (radiographically) - answer-More radiolucent Which of the following serves to clean the canal system? - answer-- paper points - sodium hypochlorite -endodontic files Which material is currently used the least frequently for indirect restorations? - answer-Composite Which of the alloys (Type I-IV) has the greatest elongation? - answer-Type I Barium sulfate is used to seal an endodontically treated tooth. Endodontic treatments often present with a radiopaque appearance. (T/F) - answer-First is FALSE. Second is TRUE. A pulpotomy removes the pulp tissue from deep in the canal system. T/F - answer-False An FMX should be taken every 2 years. A panoramic radiograph is an adequate substitute for an FMX. (T/F) - answer-Both are FALSE In a PFM crown which layer is closest to the prepared tooth structure? - answer-Coping Which imaging technique is best used to evaluate soft tissue? - answer-MRI After the removal of braces, teeth will naturally begin to shift back to their original position. T/F - answer-True Which of the following dental materials may have a radiolucent appearance radiographically? - answer-*Composite Resins* - implants -gutta percha -amalgam The dental formulation of gutta-percha contains mostly which ingredient? - answer-Zinc Oxide What is the most common synthetic bone replacement material? - answer-Calcium Phosphate Which indirect restoration typically removes the most tooth structure? - answer-Crowns Which type of suture below can be absorbed by the body? - answer-*Chromic Gut* - Gore tex - Polypropylene - silk Mobility is often the first sign of implant failure. Peri-implant mucositis is an irreversible condition. (T/F) - answer-Both are FALSE (mobility indicates failure that is irreversible. Peri-implantitis is irreversible) Temporary crowns are commonly fabricated from which of the following materials? - answer-Bis-Acryl Which material are visible light activated periodontal pack made of? - answer-urethane dimethacrylate Which type of implant requires an extraoral incision during the procedure? - answer-transosseous What is an ideal mixing time for a noneugenol zinc oxide perio pack? - answer-40 seconds When fabricating a temporary crown, it is okay for the temp restoration to be slightly coronal to the restorative margin. (T/F) - answer-False Which of the following characteristics is NOT ideal criteria for a well-placed periodontal dressing? - answer-SHOULD NOT wrap around onto the occlusal surface Which of the following is the most common type of implant placed? - answer-Endosseous Temporary crowns can also be referred to as: - answer-Provisional Crowns What recare interval is indicated for patients upon the placement of an implant? - answer-3 months Fabrication of temporary crowns is indicated for which purpose? - answer-- Aesthetics - Function - Patient Comfort What suture technique is pictured? - answer-Interrupted Metal shell crowns are most often composed of what material? - answer-Tin Rubber dam material can contain latex. (T/F) - answer-True Implants require routine polishing. When instrumenting implant surfaces, it is acceptable to use the ultrasonic. (T/F) - answer-Both are FALSE