Test 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
---|---|---|---|---|---|
what is an impression? | show 🗑
|
||||
what are the requirements of impression materials? | show 🗑
|
||||
what are chemical impression materials? | show 🗑
|
||||
show | solidification: waxes
gelation: doesn't get solid like wax, more jello like
thermoplastic (reversible)
🗑
|
||||
show | inelastic: rigid and inflexible
elastic:; rubbery and flexible
🗑
|
||||
show | rigid and inflexible used on edentulous patients (no undercut)
🗑
|
||||
show | impression compound (thermoplastic)
zinc oxide eugenol paste (chemical set)
impression plaster (chemical set)
impression waxes (thermoplastic)
🗑
|
||||
what are the characteristics of inelastic impression material? | show 🗑
|
||||
what are the characteristics of inelastic impression plaster? | show 🗑
|
||||
show | soften melted and formed to desired shape
lack of accuracy and distort easily on removal from tissue undercuts
🗑
|
||||
what are the characteristics of elastic dental impression material? | show 🗑
|
||||
show | hydrocolloids (water based impression material)
aqueous or non aqueous
non aqueous: elastomers and cross linked polymers
🗑
|
||||
what are the two hydrocolloids? | show 🗑
|
||||
show | thermoplastic and reversible hydrocolloid
🗑
|
||||
what is alginate characteristics? | show 🗑
|
||||
what do agar and alginate change to? | show 🗑
|
||||
what is the change of agar? | show 🗑
|
||||
what is the agar composition? | show 🗑
|
||||
what are the baths of the hydrocolloid condition for Agar? | show 🗑
|
||||
show | quick snap, DO NOT rock back and forth
pour up impression immediately in gypsum
🗑
|
||||
what is the hysteresis curve? | show 🗑
|
||||
show | 50 degrees C
🗑
|
||||
what temperature does gel transform into sol? gel back to a liquid | show 🗑
|
||||
what are the advantages of Agar? | show 🗑
|
||||
what are the disadvantages of agar? | show 🗑
|
||||
show | diagnostic casts, fabrication of provision restorations, fluoride and bleaching trays, mouth protectors
🗑
|
||||
what are the characteristics of alginate? | show 🗑
|
||||
what are the composition of alginate? | show 🗑
|
||||
what are the material characteristics of alginate? what happens to make it work | show 🗑
|
||||
show | 20 C 70 F
🗑
|
||||
show | 2-3 minutes
fast set 1.25-2 minutes
🗑
|
||||
show | 2-5 minutes
fast set 1-2 minutes
🗑
|
||||
what are the advantages of alginate? | show 🗑
|
||||
what are the disadvantages of alginate? | show 🗑
|
||||
what is syneresis | show 🗑
|
||||
show | alginate expands and sucks up water if they left it in a cup of water
🗑
|
||||
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
🗑
|
||||
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
🗑
|
||||
how do you remove the alginate tray? | show 🗑
|
||||
how soon must the impression be poured up in gypsum? | show 🗑
|
||||
what is the cause of grainy alginate? | show 🗑
|
||||
what is the cause of tearing alginate? | show 🗑
|
||||
what is the cause of external bubbles in alginate? | show 🗑
|
||||
what is the cause of irregularly shaped voids in alginate? | show 🗑
|
||||
what is the cause of distortion of alginate? | show 🗑
|
||||
show | plaster (white), lab stone (yellow), die stone (green blue, pink)
🗑
|
||||
what is the most expensive gypsum? | show 🗑
|
||||
what is model plaster? | show 🗑
|
||||
what is lab/dental stone? | show 🗑
|
||||
show | high strength or improved stone, most uniform, densest form, hard, abrasive resistant
🗑
|
||||
show | calcium sulfate dihydrate
🗑
|
||||
what is gypsum rock in dentistry made out of? | show 🗑
|
||||
the larger more irregular and porous particles of powder in gypsum are... | show 🗑
|
||||
what are the properties of plaster? | show 🗑
|
||||
show | calcium sulfate hemihydrate
it goes from calcium sulfate hemihydrate to a calcium sulfate dihydrate
🗑
|
||||
what is made by direct and rapid heating process in open air? | show 🗑
|
||||
show | stone
🗑
|
||||
what are the properties of stone? | show 🗑
|
||||
show | strongest, less expansive, more expensive strobe
used mainly for making casts or dies for fabrication of crowns, bridge onlay/inlay
🗑
|
||||
show | die stone
🗑
|
||||
show | densitry and compressive strength
🗑
|
||||
which stone has the greatest density? | show 🗑
|
||||
show | 45-50 ml
🗑
|
||||
how much water do you mix for 100 g of stone powder? | show 🗑
|
||||
show | 19-24
🗑
|
||||
if you increase the amount of water to plaster/stone... | show 🗑
|
||||
if you decrease the amount of water to plaster/stone... | show 🗑
|
||||
an increase in spatulation time will... | show 🗑
|
||||
does temperature affect dental stone? | show 🗑
|
||||
show | accelerate the chemical reaction by acting as established site for crystallization
🗑
|
||||
show | retarder, slows down reaction
🗑
|
||||
show | accelerator, speeds up reaction
🗑
|
||||
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
🗑
|
||||
what is the final setting time? | show 🗑
|
||||
what can you do to increase setting time of dental stone? | show 🗑
|
||||
what can you do to decrease setting time of dental stone? | show 🗑
|
||||
what are preliminary impressions used for? | show 🗑
|
||||
show | more accurate detail of tooth structure, used by laboratory clinician to construct restorations, dentures and implants
🗑
|
||||
when selecting size of tray for impressions the width should... | show 🗑
|
||||
show | cover the retromolar pad, maxillary tuberosity and have 1/4 inch anterior clearance of the most protruded incisor
🗑
|
||||
what should you watch out for when taking impressions? unusual impressions? | show 🗑
|
||||
what are the pre trimming streps? | show 🗑
|
||||
how should the back of the model be trimmed? | show 🗑
|
||||
how should the base be trimmed? | show 🗑
|
||||
how should the backs be trimmed? | show 🗑
|
||||
how do you trim the maxillary cast? | show 🗑
|
||||
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
🗑
|
||||
how do you trim the posterior angles or heels of maxillary and mandibular arch? | show 🗑
|
||||
show | 2 inches
🗑
|
||||
how do you trim the sides of each individual cast? | show 🗑
|
||||
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
🗑
|
||||
what is patient protected from while wearing rubber dam? | show 🗑
|
||||
what is tissue protected from while patient wears rubber dam? | show 🗑
|
||||
what is the clinician protected from while patient wears rubber dam? | show 🗑
|
||||
what are the disadvantages to rubber dams? | show 🗑
|
||||
what are the contraindications from rubber dams? | show 🗑
|
||||
show | dull or powdered side for less reflection
🗑
|
||||
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
🗑
|
||||
why should the retainer not extend into the medial or distal embrasure? | show 🗑
|
||||
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
🗑
|
||||
how are wingless clamps identified | show 🗑
|
||||
how should you sterilize the rubber dam punch? | show 🗑
|
||||
show | vaseline or cocoa butter because it contaminates the field and may cause breakdown of dam causing leakage, makes dam inversion more difficult
🗑
|
||||
show | 5 teeth
🗑
|
||||
show | lingually cusps of posterior teeth and cingulum of anterior teeth
🗑
|
||||
what should you do with higher/fuller papillae in rubber dam placement? | show 🗑
|
||||
show | cause excessive stretching of the rubber dam resulting in leaking or loss of moisture control
🗑
|
||||
show | bunching of the dam inter proximally and limited access to proximal surfaces
🗑
|
||||
what is the number 1 hole on the rubber dam punch used for | show 🗑
|
||||
what is the number 2 hole on the rubber dam punch used for | show 🗑
|
||||
what is the number 3 hole on the rubber dam punch used for | show 🗑
|
||||
what is the number 4 hole on the rubber dam punch used for | show 🗑
|
||||
show | molars and clamps
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
Chobchi
Popular Dentistry sets