Instrumentation Flashcards
What are the two types of tooth cutting instruments
-Hand and rotary instruments
What are hand instruments used for
to cut, plan, and cleave tooth structure
How many series are there in the UBSDM internal system
3 (A,B,C series)
A series instruments are used to..
cut and shape tooth structure and includes hatchets, hoes, chisels, and spoon excavators (caries removal)
B series instruments are used to
place restorative materials (i.e amalgam condensors and plastic instruments)
C series instruments are used to…
shape and finish restorative materials (i.e holdback covers, cleoid discoids, and other carvers)
Blacks classification systems for instruments is based on…
size and configuration of instrument
What is the primary cutting edge of an instrument
primary working surface of the instrument
The primary cutting edge can be either __ or __ beveled
mono or bi
What is the shank
connects the blade to the handle
Can a blonde have a secondary cutting edge
yes
How many numbers (digits) are there is Blacks instrument classification system
3
What does each digit in the Blacks Classification system mean
- 1st digit= Width of blade in 10th of a millimeter
- 2nd digit= Length of blade in mm
- 3rd digit=Angle of the long axis of blade with handle in degrees centigrade
If the first digits in Blacks classification system is 15 what does this means
the width of the blade is 1.5 mm
90 degrees is how many degrees centigrade
25
270 degrees is how many degrees centigrade
75
0 degrees is how many degrees centigrade
0
Blacks classification system also has a 4 number formula, what digits in this new classification system are the same as the 3 digits system
the 1st remains the same
What digit in the 3 digit Blacks classification system comes the 3rd digit in the 4 digit system
2nd digit
The 2nd digit in the Blacks classification system with 4 digits represent
2nd= Angle of the cutting edge of the blade with the handle in degrees centigrade
The 4th digit represents
angle of long axis of blade with handle in degrees centigrade (Same as the 2nd digit in the 3 digits system)
Is the drill the same as the bur
no
A bur is __ cutting verses a drill which is __ cutting
side… end
Multibladded rotary instruments are more effective at __ cutting verses __ cutting
die… end
A bur is a __ instrument
multibladded rotary instrument
(T/F) burs cut in one direction only
t
How are burs classified
shape and diameter of the cutting edge of the bur
What are the two parts of the bur
head and shaft
How is the head of the bur classified
shape and diameter
What is the function of the shaft of the bur
adapts the head to the handpiece
Straight fissure bur is (single/multipurpose)
multipurpose
What is the straight fissure bur numbered
55.5-60
The straight fissure bur is a __ sided bur
parallel
Cross cut bur is similar to…
straight fissure bur
What are the differences between a cross cut bur and a straight fissure bur is that the cross cut burs have __ on the blades
notches (or flutes)
Cross cut straight burs are numbered
556-560
How are cross cut straight burs not as necessary today
because there are flutes on the blades which are not as necessary because of high speed handpeices
What is the numbering for an inverted cone bur
33.5-40
What is an inverted cone bur used for?
Develops retentive features, smooth walls and sharpen angle of cavity prep
In inverted cone burs the side of the bur (Diverge/converge/are parallel) towards the shank
converge
The tapered fissure bur is numbered
168-171
A tapered fissure bur is used for
initial stages of cavity preparation and tapered wall forms
Describe the shape of the tapered fissure bur
Sides of the bur converge towards the end of the bur
What is the number for a round bur
1/16 - 11
Purpose of the round bur is to
develop retentive features and remove caries
There are notes on this reading in my notebook
ok
