instruments used in fixed prosthodontics

Question 1

speed ranges of :
-low speed hp
-indtermediate speed
-ultra/super speed

Answer 1

->6000rpm
-6000-100,000 rpm
->100,000 rpm

Question 2

what speed hand piece is used while doing finishing procedures such as placement of retentive grooves and bevels ?

Answer 2

intermediate speed, preferred when vision is poor and a more positive sense of touch is required

Question 3

con of steel burs?

Answer 3

dulls rapidly at higher speeds or when cutting enamel

Question 4

what is the use of the round bur?

Answer 4

caries removal and initial tooth preparation

Question 5

what’s the function of an inverted cone bur ?

Answer 5

wall angulation , creating undercuts and smoothening the floors

Question 6

what’s the purpose of a pear shaped bur ?

Answer 6

class 1 cavity for gold foil

Question 7

what kind of preparation is done using a straight fissure bur ?

Answer 7

amalgam preparation

Question 8

which bur is used for inlays and placing grooves ?

Answer 8

tapered fissure

Question 9

diamond stones are placed on cylinder by electroplating

Question 10

yellow :
red:
blue :
green:
black:

Answer 10

-extra fine
-fine
-medium
-coarse
-super coarse

Question 11

which type of burs are used for extra-coronal restorations and which burs are used for intra-coronal restorations?

Answer 11

intra coronal : carbide –>direct restorations , inlays , onlays

extracornal : diamond

Question 12

number of blades on carbide bur for maximum cutting efficiency :

Answer 12

6-8, anything more is less effective at cutting and is used for finishing

Question 13

which burs are used for the palatal surface of anterior teeth in crown preparation ?

Answer 13

wheel or football diamond bur

Question 14

torpedo / tinker :

Answer 14

bevel