intro- instruments and equipment Flashcards
what are the direct restorative materials recommended for anterior and posterior teeth?
resin composites and adhesives
are explorers cutting or non cutting?
non cutting
what is the function of straight explorer 6?
for investigation of defectivr restoration margins, can also be used to determine the angulation of the cavity walls since it has a straight line, sharp
what is the function of curved explorer?
no 48 and 12 is to detect interproximal margins, their angled tines are able to negotiate areas just below the contact point
which perio probe is this: graduated in mm steps of 2x3mm 1x2 mm 1x3 mmi.e. 3 3 2 3
perio probe cp11,
function of ging margin trimmer?
used to finish the ging margins of Class II cavities and to remove ragged edges left by fissure burs
what is enamel hatchet similar to? with what difference
gingival margin trimmer but with cutting edge right angled to the blade
function of enamel hatchet?
used to finish B/L walls in class II cavities and to remove ragged edges left by fissure burs
whats this instrument?used for carrying materials that are in an unset condition to the cavity
flat plastic
why is flat plastic called that
plastic because the materials may be said are in plastic state
what is the rotation speed of low and high speed handpieces?
less than 12,000 rpm , more than 200,000 rpm,
what are the functions of slow and high speed handpieces?
slow for cleaning teeth, caries excavation, finishing and polishing and cutting soft tissue. High speed for tooth prep, removal of old restoratives,
does high speed handpiece have high or low pressure?
low pressure
what are the colour codes for handpieces?and their respective transmission ratios
- red-high speed for tooth prep 1:5 TR
- blue caries excavation 1:1 TR,
- green caries excavation x:1 TR x being less than 1 so slower than the motor speed
why is it important to run the handpieces for a few seconds before starting the prep?
the lubricating oil may cause contamination in the tooth or cavity
how many types of bur shanks do we have?
3- 1.straigh handpiece shank that is retained by a metal chuck- not really for tooth cons 2. right angle latch shank for SSH, 3. FG shank also retained by metal chuck and for HSH `
why are the neck of burs tapered towards the head?
for better visibility
how many types of materials do we have for burs? and which ones are more efficient and common
steel, carbide and diamond
Carbide and diamond burs are more effi and common.
function difference of function between the different bur types by material?
steel is blade cutting, caries exo, and used with SS
carbide is also blade cutting, more effi then steel for tooth prerp and harder than steel, less prone to become dull so good for HS and SS
diamond burs have a different mechanism of cutting: abrasive cutting where they have small dimond particles in a matrix
what do we use for cavity preps for amalgam?
flat end fissure or cylinder diamond
what do we use for resin composite cavity preps?
pear shaped, round-ended diamond or tungsten carbide for HS
where is round carbide bur usually used?
caries removal
true/false, carbide burs only work of on clockwise direction ?
yes
are the diamonds on the burs natural?
both natural and synthetic which are crushed to powder
