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Test 3

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
what is an impression?   show
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what are the requirements of impression materials?   show
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what are chemical impression materials?   show
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show solidification: waxes gelation: doesn't get solid like wax, more jello like thermoplastic (reversible)  
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show inelastic: rigid and inflexible elastic:; rubbery and flexible  
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show rigid and inflexible used on edentulous patients (no undercut)  
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show impression compound (thermoplastic) zinc oxide eugenol paste (chemical set) impression plaster (chemical set) impression waxes (thermoplastic)  
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what are the characteristics of inelastic impression material?   show
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what are the characteristics of inelastic impression plaster?   show
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show soften melted and formed to desired shape lack of accuracy and distort easily on removal from tissue undercuts  
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what are the characteristics of elastic dental impression material?   show
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show hydrocolloids (water based impression material) aqueous or non aqueous non aqueous: elastomers and cross linked polymers  
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what are the two hydrocolloids?   show
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show thermoplastic and reversible hydrocolloid  
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what is alginate characteristics?   show
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what do agar and alginate change to?   show
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what is the change of agar?   show
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what is the agar composition?   show
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what are the baths of the hydrocolloid condition for Agar?   show
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show quick snap, DO NOT rock back and forth pour up impression immediately in gypsum  
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what is the hysteresis curve?   show
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show 50 degrees C  
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what temperature does gel transform into sol? gel back to a liquid   show
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what are the advantages of Agar?   show
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what are the disadvantages of agar?   show
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show diagnostic casts, fabrication of provision restorations, fluoride and bleaching trays, mouth protectors  
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what are the characteristics of alginate?   show
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what are the composition of alginate?   show
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what are the material characteristics of alginate? what happens to make it work   show
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show 20 C 70 F  
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show 2-3 minutes fast set 1.25-2 minutes  
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show 2-5 minutes fast set 1-2 minutes  
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what are the advantages of alginate?   show
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what are the disadvantages of alginate?   show
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what is syneresis   show
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show alginate expands and sucks up water if they left it in a cup of water  
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show select appropriate try size, determine water/powder ratio, place water into rubber mixing bowl, fluff alginate and sift powder into water and stir until all particles wet, use stropping motion  
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show load impression with alginate place a small amount of alginate on the occlusal surface of posterior teeth place tray in mouth and make sure centered seat tray posterior first then anterior portion and press lightly and pull lip over, hold until set  
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how do you remove the alginate tray?   show
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how soon must the impression be poured up in gypsum?   show
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what is the cause of grainy alginate?   show
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what is the cause of tearing alginate?   show
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what is the cause of external bubbles in alginate?   show
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what is the cause of irregularly shaped voids in alginate?   show
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what is the cause of distortion of alginate?   show
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show plaster (white), lab stone (yellow), die stone (green blue, pink)  
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what is the most expensive gypsum?   show
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what is model plaster?   show
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what is lab/dental stone?   show
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show high strength or improved stone, most uniform, densest form, hard, abrasive resistant  
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show calcium sulfate dihydrate  
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what is gypsum rock in dentistry made out of?   show
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the larger more irregular and porous particles of powder in gypsum are...   show
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what are the properties of plaster?   show
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show calcium sulfate hemihydrate it goes from calcium sulfate hemihydrate to a calcium sulfate dihydrate  
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what is made by direct and rapid heating process in open air?   show
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show stone  
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what are the properties of stone?   show
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show strongest, less expansive, more expensive strobe used mainly for making casts or dies for fabrication of crowns, bridge onlay/inlay  
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show die stone  
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show densitry and compressive strength  
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which stone has the greatest density?   show
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show 45-50 ml  
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how much water do you mix for 100 g of stone powder?   show
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show 19-24  
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if you increase the amount of water to plaster/stone...   show
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if you decrease the amount of water to plaster/stone...   show
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an increase in spatulation time will...   show
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does temperature affect dental stone?   show
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show accelerate the chemical reaction by acting as established site for crystallization  
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show retarder, slows down reaction  
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show accelerator, speeds up reaction  
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show length of time from the start of the mix until the setting mass reaches a ski hard stage represents the available time for manipulating the product  
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what is the final setting time?   show
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what can you do to increase setting time of dental stone?   show
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what can you do to decrease setting time of dental stone?   show
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what are preliminary impressions used for?   show
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show more accurate detail of tooth structure, used by laboratory clinician to construct restorations, dentures and implants  
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when selecting size of tray for impressions the width should...   show
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show cover the retromolar pad, maxillary tuberosity and have 1/4 inch anterior clearance of the most protruded incisor  
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what should you watch out for when taking impressions? unusual impressions?   show
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what are the pre trimming streps?   show
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how should the back of the model be trimmed?   show
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how should the base be trimmed?   show
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how should the backs be trimmed?   show
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how do you trim the maxillary cast?   show
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show round off the anterior portion of the cast in the shape of an arch arch should extend from the canine eminence to canine eminence  
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how do you trim the posterior angles or heels of maxillary and mandibular arch?   show
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show 2 inches  
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how do you trim the sides of each individual cast?   show
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show provides a dry, clean visible field, dark colors provide contrasting field and reduces eye fatigue, allows for more refined tooth preparation in absence of moisture from saliva while retraction cheeks, lips and gingival tissue  
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what is patient protected from while wearing rubber dam?   show
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what is tissue protected from while patient wears rubber dam?   show
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what is the clinician protected from while patient wears rubber dam?   show
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what are the disadvantages to rubber dams?   show
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what are the contraindications from rubber dams?   show
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show dull or powdered side for less reflection  
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show anchors the dam to the most posterior tooth to be isolated with bow of clamp placed at distal aspect retainer should not extend into the medial or distal embrasure  
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why should the retainer not extend into the medial or distal embrasure?   show
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show the hole for the tooth to be restored is punched 1.0 to 1.5 mm facial to the alignment of the other holes clamp is positioned 1 mm below lesion to avoid gingival floor collapse  
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how are wingless clamps identified   show
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how should you sterilize the rubber dam punch?   show
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show vaseline or cocoa butter because it contaminates the field and may cause breakdown of dam causing leakage, makes dam inversion more difficult  
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show 5 teeth  
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show lingually cusps of posterior teeth and cingulum of anterior teeth  
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what should you do with higher/fuller papillae in rubber dam placement?   show
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show cause excessive stretching of the rubber dam resulting in leaking or loss of moisture control  
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show bunching of the dam inter proximally and limited access to proximal surfaces  
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what is the number 1 hole on the rubber dam punch used for   show
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what is the number 2 hole on the rubber dam punch used for   show
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what is the number 3 hole on the rubber dam punch used for   show
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what is the number 4 hole on the rubber dam punch used for   show
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show molars and clamps  
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