The student quiz

Instruments ( Answers)

(Lecture1)

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 ofrestoration.

3-The periodontal probe is a blunt or hasa 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:

a. Shank

b. shaft

c.blade or nib

3- An example of a circumferential beveled instrument:

a. Spoon excavatorb. Hatchetc. Chisel

(Lecture2)

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 80.

5- The last separate figure at the end of the shaftis 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 instruments.

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 instruments. T

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 theforce is applied at the __________ to the plane of theblade and handle.

a. Base b. Right anglec. 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 shaftb. by checking the direction of the excavatorc. by checking the direction of the bevel

4-direct and reverse beveled are examples of :a. Wedelstaedt chisels

b. GMT 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 the shaft.

6-Angle formers and gingival margin trimmers are the only handcutting instruments with _________instrument formula.

a. four figuresb. one figurec. 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. a.GMT b. Off- set hatchet c. chisel

8-It is useful for cleaving undermined enamel and its uses are exactly the same as all enamel chisels. a. excavator b. triangular chisel c. off-set hatchet

9-They are mainly used to work on dentin. (excavators) a. hatchet b. chisel 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 aluminumb. Plastic (hard plastic)c. All of the above

12-this picture shows an /a

a. applicator b. amalgam carrier c. excavator

13- Teflon or titanium plated condenserare 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 sideonly. chisel

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 andamalgam, specially for creation of proximal fossae and marginalridges. 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?

for amalgam

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 Amalgamand gold carvers.They are used primarily forocclusal carving.

14- Disposable scalpel bladeIs very useful for carving resincomposite restorations.

(Lecture 3)

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 useb. Frequent sterilization.c. All of the above.

3-in any sharpening technique _______must be used:a. Oilb. Waterc. Wax

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 c.hand instruments

5-_________devised a foot engine that allowed the dentist tokeep both hands free while powering the dental drill.

a. Blackb. Airdentc. technology

6-In a slow hand instrument we attach the bur that has aa. screwb. latchc. magnet

7-The parts of a bur are:a. head, shank, attachmentb. nib, shaft, shankc. shaft , shank, nib

8- _________ burs generate much less heatduring cavity preparation because theyare more effective cutters, specially athigh speed. a. carbide b. steel c. diamond

9- ______ burs are used onlyat low speed ranges. a. slow b. steel 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 ofgreat clinical importance, as they are used forremoval of hard tooth tissues (enamel) andfinishing and polishing most of restorations and they act by friction. a. excavators b. abrasives c. high speed instruments

12- These dental stones are classified as : a. diamond

b. carbidec. aluminum oxide

13- __________are the attachment part whichcarry the un-mounted abrasive tools.

a. Shankb. Mandrelsc. Attachment end

14- Rubber implanted abrasives are used for: a. polishing b. carving c. smoothing

Done by: Hessa Habib and Rasha Shehab

Quiz 1

Dental instruments

Lec 1

1. Scalpales and mylar strips are classified into what type of instruments:a) Instruments used for removal of tooth substance and restorativesb) Instruments used for isolationc) Instruments used for finishing and polishingd) Instruments used for condensation and packing

2. ----------------- Are function(s) of a periodontal probe :a) Measure the depth of periodontal pocketb) Feel the tooth surfaces for defects and/ or irregularitiesc) Determine the features and dimensions of restorationsd) Both answers (a) and(c)

3. Rubber impregmented cones (inverted cones) are used for:a) Isolationb) polishingc) carvingd) condensing

4. a mouth mirror that doesn’t produce double images and recommended for clarity vision :

a) regularb) front-sidedc) silvered on the outer side d) both (b) and (c)

5. arrange inorder the following instruments(tools) depending on the energy utilized:(1) rotary (2) air abrasion(3) ultrasonic(4) hand(5) lasers

a) 3,5,2,1,4b) 5,4,1,2,3c) 4,1,3,2,5d) 4,1,3,5,2

6. All are types of explorers except:a) Sheperd’sb) Sickle probec) Periodontal probed) Straight explorer

7. Instrument nomenclature includes except:a) Functionb) Number of anglesc) position

d) number of bevels

8. what is the importance of having the working part at an angle to the central axis of the shaft:

a) to have a significant designb) to facilitate access to different areas of the teethc) to differentiate between right and left instrumentsd) to suit the tooth depth

9. bi-beveled instruments are constricted on :a) excavatorsb) angle formersc) hatchets and straight chiselsd) carvers

10. if the cutting edge is was away from the operator , this indicates that the instrument is:a) on mesial aspectb) right instrumentc) distal aspectd) distal and right instrument

fill in the blanks

1. before we make a restoration we place a (an) articulating forceps to mark the contacts of teeth in opposing arches during closure.

2. The shaft should be serrated or smooth knurled to avoid sliping from the operater’s hand.

3. A single ring on a shaft indicates a right instrument and a double ring on a shank indicates the presence of a reverse instrument (mesial or distal)

4. This instrument is easy to replace and constricted on mirrors and condencors , those instruments are called cone-socket instruments .

5. Instruments with 2 or more angles in the shank on one plane are described as single-planned instruments.

Quiz 2

Dental Instruments

Lec 2

1. A pine leaf-like instrument used for shaping the restoration according to teeth land marks is:

a) Cleioide- discoid excavator b) Chiselc) Hollenback carverd) Enamel hatchet

2. A device where we insert an amalgam capsule to produce a thick smooth amalgam paste:

a) Amalgam carrierb) Amalgamatorc) Amalgam welld) Spoon excavator

3. An instrument used  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 contour to 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 b) Cotton rollsc) Matrix retainerd) Wooden wedges

4. Instruments with cutting edges like a single beveled hatchet , but makes an angle of 90 or 85 degrees for mesial and distal aspects:

a) Gingival marginal trimmers (GMT)b) Off-set hatchetc) Hoe excavatord) Burnisher

5. Instrument used after carving ,has two different tips, used to fabricate deep fissures on occlusal surface:

a) Scalpel bladeb) Burnishersc) Excavatorsd) Rotary burs

6. Put in order the following process of amalgam restorations:(1) Use an amalgam carver to carve(shape) the occlusal surface for normal jaws

closure.(2) Put an amalgam capsule in the amalgamator and place the product in an

amalgam well.(3) Use an amalgam carrier to put in the amalgam, and then apply in the cavity.(4) With an appropriate amalgam condencer , condence the amalgam restoration

neatly into the cavity .(5) Use a burnisher to create the original tooth fissures on the occlusal surface .

a) 1,5,3,4,2b) 2, 3,5,4,1c) 2,3,4,1,5d) 3,4,5,1,2

7. What does the last number in an instrument formula indicate:a) Width of the bevelb) Length of the bladec) Angle between the blade and the long axsis of the shaftd) Diameter of the shaft

8. Which instrument(s) contain 4 figures in the instrument formula:a) Explorers and probes

b) Enamel hatchetc) Gingival marginal trimmers and angle formers d) cleioide- discoid excavators

9. specialized chisels used to shape internal dentine walls and for planning enamel rods of cervical cavities of posterior teeth:a) straight chiselb) triangular chiselc) widelstaedt chiselsd) angel formers

fill in the blanks:

1. applicators are instruments used for carrying and applying sensitive materials to the deepest areas of the cavities.

2. The interproximal carver is for carving proximal amalgam surfaces near interproximal contact areas.

3. For a 4 figure instrument the second number indicates the edge of the blade at an angle other than 90 degrees to the blade

4. The angle between the edge of the blade and the shaft is 95 degrees for mesial aspect and80 Degrees for distal aspect .

5. The main use of excavators is to scoop out caries

Good luck for u all

Done by: Rasha Shehab