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The student quiz
Instruments ( Answers)
Fill in the blanks:
1-Mouth mirror is used for indirect visualization and to reflect the operating light
and to retract soft tissues.
2- Explorers are used to feel the tooth surfaces for defects and/or irregularities.
Also determine the hardness of exposed dentin. And for checking the margins of
3-The periodontal probe is a blunt or has
a small ball at the end.
4- Carbide steel is the most efficient in cutting.
5-If the bevel’s acute angle is on the right side the instrument is a left instrument.
Circle the correct answer.
1-Each hand instrument contains three parts which are( from bottom to up) :
a. shank, shaft ,blade or nib
b. shaft, blade or nib ,shank
c. shaft , shank, working end
2- The part that is grasped in the operator’s hand:
c.blade or nib
3- An example of a circumferential beveled instrument:
a. Spoon excavator
Write the following answers:
1-the reason of having contra-angled instruments: the reason for a
contra-angled instrument is accessibility, visibility and stability.
2-An instrument with the working part at an angle to the central axis of the shaft
is used for?For facilitating access to different areas of teeth.
3-The three figures instrument has three digits the 3rd one indicates the angle
between the blade and long axis of the shaft in centigrade.
4- In a four figures instrument the angle is either 80 or 95 explain.
An instrument formula with four figures indicates that the edge of the blade is at
an angle other than 90 degree to the blade .So for the instruments used for
mesial aspects the angle is 95 and the ones used for distal aspects the angle is
5- The last separate figure at the end of the shaft
is the stock number for the manufacturer of the particular instrument.
Fill in the blanks:
1-The balance is at its maximum when using a straight instrument.
2-Enamel hatchets and bin-angle chisels are examples of direct cutting
3-The cutting edge on an instrument is called a bevel
4-To differentiate between mesial and distal we hold the instrument downward
facing the ground.
5-Only hatchets and straight chisel are bi-beveled.
6- An instrument in which its blade is beveled in all edges or peripheries is called
circumferentially beveled instrument
Write T for true and F for false:
1-Instruments with two or more angles in the shank in one plane are described
as single plane instruments. T
2-When the effective force applied by the instrument is in line with the direction of
the blade, the instrument is called a lateral cutting. F
3-Lateral cutting instruments are have a curved blade called double-planned
4-Single planned instruments are only used in a direct cutting instrument only.F
5-Double planned instruments can only be used on a lateral cutting. T
6-An excavator is used for carving.F
Circle the correct answer:
1-Lateral cutting instruments are those in which the
force is applied at the __________ to the plane of the
blade and handle.
b. Right angle
c. Lateral side
2-There are many types of bevels:
a. Single, Bi, triple and circumferentially-beveled instruments
b. Triple and Circumferentially beveled instruments
c. none of the above.
3-How can we know if the instrument is right or left lateral or mesial?
a. by checking the direction of the shaft
b. by checking the direction of the excavator
c. by checking the direction of the bevel
4-direct and reverse beveled are examples of :
a. Wedelstaedt chisels
c. Off-set hatchets
5-On the shaft of an instrument the numbers engraved indicates:
a. the specific use of an instrument and the numbers are in tenths
b. the specifc use of an instrument and the metric system is used.
c. the specific use of an instrument and the numbers indicate the length of
6-Angle formers and gingival margin trimmers are the only hand
cutting instruments with _________instrument formula.
a. four figures
b. one figure
c. two figure
7-It is like the regular hatchet, except the whole blade is rotated a quarter of a
turn forwards or backward around its long axis and they are convenient in
planning the buccal and lingual walls of posterior teeth.
b. Off- set hatchet
8-It is useful for cleaving undermined enamel and its uses are exactly the same
as all enamel chisels.
b. triangular chisel
c. off-set hatchet
9-They are mainly used to work on dentin. (excavators)
c. none of the above
10-This form of excavator is used for delicate cutting within preparations,
especially in incisors.
a. hoe excavator
b. spoon excavator
c. hatchet excavator
11- Plastic instruments are made up of.
a. Stainless steel or aluminum
b. Plastic (hard plastic)
c. All of the above
12-this picture shows an /a
b. amalgam carrier
13- Teflon or titanium plated condenser
are used for :
a. amalgam restoration
b. gold foil resoration
c. composite restoration
Indicate the type of instrument:
1- They are mainly designed to cleave undermined enamel and to shape enamel
walls, their blades are relatively heavier and beveled on one side
2-They are used as a scraper of dentin in the internal parts of cavities specially
the pulpal walls or floors.Mon-angled chisel
3-They are single planned instruments that are similar to straight chisels but have
a slight curvature on their shank and it can be used to shape the internal walls of
dentin. Widelstaedt chisel.
4-Are used to scoop out the cavities and usually they are rounded with a
concavity. Spoon excavator.
5- Are used to sharpen point and line angels and their cutting edge is like that of
a single hatchet. GMT
6-They are used for splitting or cleaving undermined enamel from the buccal and
lingual margins of the occlusal cavities and on the buccal and lingual margins in
the proximal cavities where it is not possible to use a chisel. Enamel hatchet
7- Excavators that are used to cut mesial and distal walls of molars and
premolars. Hoe excavator.
8- It’s used for scooping out carious parts of the tooth and it can be used for
removal of marginal flashes of amalgam during carving. Discoid excavator.
9-It is a most helpful instrument for carving gold fail and
amalgam, specially for creation of proximal fossae and marginal
ridges. Cleoide excavator
10- instruments that are used to mix cements together are called. Mixing spatula
11-This photos shows a condenser which is used for?
12-This photo shows burnishes which are used for?
for smoothning up the amalgam or restoration.
13-This photo shows a cleoid discoid carver and it’s used for?
They can be used as Amalgam
and gold carvers.They are used primarily for
14- Disposable scalpel blade
Is very useful for carving resin
Circle the correct answer
1-The most universally hand grasp used is:
a. the pen grasp
b. palm and thumb grasp
c. inverted pen grasp
2-instruments get dulled by:
a. Repetitive use
b. Frequent sterilization.
c. All of the above.
3-in any sharpening technique _______must be used:
4-__________ are tools or attachments that are fitted in the hand piece and work
by energy delivered from a source of power.
a. mechanical instruments
b. rotary instruments
5-_________devised a foot engine that allowed the dentist to
keep both hands free while powering the dental drill.
6-In a slow hand instrument we attach the bur that has a
7-The parts of a bur are:
a. head, shank, attachment
b. nib, shaft, shank
c. shaft , shank, nib
8- _________ burs generate much less heat
during cavity preparation because they
are more effective cutters, specially at
9- ______ burs are used only
at low speed ranges.
c. tungsten carbide
10-The more the flutes the
a. the quicker the operation
b. the louder the noise of the instrument
c. the smoother the finishing
11- Most of these types of instruments are of
great clinical importance, as they are used for
removal of hard tooth tissues (enamel) and
finishing and polishing most of restorations and they act by friction.
c. high speed instruments
12- These dental stones are classified as :
c. aluminum oxide
13- __________are the attachment part which
carry the un-mounted abrasive tools.
c. Attachment end
14- Rubber implanted abrasives are used for:
Done by: Hessa Habib and Rasha Shehab
1. Scalpalesandmylarstripsare classifiedintowhattype of instruments:
a) Instrumentsusedforremoval of toothsubstance andrestoratives
2. ----------------- Are function(s)of aperiodontal probe :
a) Measure the depthof periodontal pocket
b) Feel the toothsurfacesfordefectsand/orirregularities
c) Determine the featuresanddimensionsof restorations
d) Both answers(a) and(c)
3. Rubberimpregmentedcones(invertedcones) are usedfor:
4. a mouthmirror that doesn’tproduce double imagesandrecommendedforclarityvision
c) silveredonthe outerside
d) both(b) and (c)
5. arrange inorderthe followinginstruments(tools)dependingonthe energyutilized:
(2) air abrasion
6. All are typesof explorersexcept:
b) Sickle probe
c) Periodontal probe
d) Straight explorer
7. Instrumentnomenclature includesexcept:
b) Numberof angles
d) numberof bevels
8. whatis the importance of havingthe workingpartat an angle to the central axisof the
a) to have a significantdesign
b) to facilitate accesstodifferent areasof the teeth
c) to differentiate betweenrightandleftinstruments
d) to suitthe tooth depth
9. bi-beveledinstrumentsare constrictedon:
b) angle formers
c) hatchetsand straightchisels
10. if the cuttingedge iswas awayfrom the operator , thisindicatesthatthe instrumentis:
a) on mesial aspect
c) distal aspect
d) distal andright instrument
fill inthe blanks
1. before we make arestorationwe place a (an) articulatingforceps tomarkthe contacts
of teethinopposingarches duringclosure.
2. The shaft shouldbe serratedorsmoothknurledto avoidslipingfromthe operater’s
3. A single ringona shaftindicatesa right instrumentandadouble ringona shank
indicatesthe presence of areverse instrument(mesial ordistal)
4. Thisinstrumentiseasytoreplace andconstrictedonmirrors andcondencors , those
instrumentsare called cone-socketinstruments .
5. Instrumentswith2or more anglesinthe shank on one plane are describedas single-
1. A pine leaf-like instrumentusedforshapingthe restorationaccordingtoteethland
a) Cleioide- discoidexcavator
d) Enamel hatchet
2. A device where we insertanamalgamcapsule toproduce a thicksmoothamalgam
3. An instrumentused to hold the matrices (metal bands or strips) firmly in
place around a tooth temporarily while the filling material is being packed
into place to impart more desirable contourto restorations.
(Hint: to take the surrounding shape of the tooth (example marginal ridges) and make it
exactly the same as the original one with carving).
a) Rubber dam
c) Matrix retainer
4. Instrumentswithcuttingedgeslike asingle beveledhatchet,butmakesan angle
of 90 or 85 degreesformesial anddistal aspects:
a) Gingival marginal trimmers(GMT)
c) Hoe excavator
5. Instrumentusedaftercarving,hastwodifferenttips,usedtofabricate deep
a) Scalpel blade
d) Rotary burs
6. Put inorderthe followingprocessof amalgamrestorations:
(1) Use an amalgamcarver to carve(shape) the occlusal surface fornormal jaws
(2) Put an amalgamcapsule inthe amalgamatorandplace the product in an
(3) Use an amalgamcarrier toput in the amalgam, andthenapplyinthe cavity.
(4) Withan appropriate amalgamcondencer,condence the amalgamrestoration
(5) Use a burnishertocreate the original toothfissuresonthe occlusal surface .
b) 2, 3,5,4,1
7. What doesthe lastnumberinan instrumentformulaindicate:
a) Widthof the bevel
b) Lengthof the blade
c) Angle betweenthe blade andthe longaxsisof the shaft
d) Diameterof the shaft
8. Whichinstrument(s) contain4figuresinthe instrumentformula:
b) Enamel hatchet
c) Gingival marginal trimmersandangle formers
d) cleioide- discoidexcavators
9. specializedchisels usedtoshape internaldentine wallsandforplanningenamel
rods of cervical cavitiesof posteriorteeth:
d) angel formers
fill inthe blanks:
1. applicators are instrumentsusedforcarryingand applyingsensitive materialsto
the deepestareasof the cavities.
2. The interproximal carveris forcarving proximal amalgamsurfacesnear
3. For a 4 figure instrumentthe secondnumberindicates the edge of the blade atan
angle otherthan90 degreestothe blade
4. The angle betweenthe edge of the blade andthe shaftis 95 degreesformesial
80 Degreesfordistal aspect.
5. The main use of excavatorsisto scoopout caries
Good luckfor u all
Done by: RashaShehab