The student quiz<br />Instruments ( Answers) <br />(Lecture1)<br />Fill in the blanks:<br />1-Mouth mirror is used for indirect visualization and to reflect the operating light and to retract soft tissues.<br />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<br />restoration.<br />3-The periodontal probe is a blunt or has<br />a small ball at the end.<br />4- Carbide steel is the most efficient in cutting.<br />5-If the bevel’s acute angle is on the right side the instrument is a left instrument.<br />Circle the correct answer.<br />1-Each hand instrument contains three parts which are( from bottom to up) :<br /> a. shank, shaft ,blade or nib<br /> b. shaft, blade or nib ,shank<br /> c. shaft , shank, working end <br />2- The part that is grasped in the operator’s hand:<br /> a. Shank<br /> b. shaft<br /> c.blade or nib<br />3- An example of a circumferential beveled instrument:<br />
(Lecture2)<br />Write the following answers:<br />1-the reason of having contra-angled instruments: the reason for a contra-angled instrument is accessibility, visibility and stability. <br />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.<br />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.<br />4- In a four figures instrument the angle is either 80 or 95 explain.<br />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.<br />5- The last separate figure at the end of the shaft<br />is the stock number for the manufacturer of the particular instrument.<br />.<br />Fill in the blanks:<br />1-The balance is at its maximum when using a straight instrument.<br />2-Enamel hatchets and bin-angle chisels are examples of direct cutting instruments.<br />3-The cutting edge on an instrument is called a bevel<br />4-To differentiate between mesial and distal we hold the instrument downward facing the ground.<br />5-Only hatchets and straight chisel are bi-beveled.<br />6- An instrument in which its blade is beveled in all edges or peripheries is called circumferentially beveled instrument<br />Write T for true and F for false:<br />1-Instruments with two or more angles in the shank in one plane are described as single plane instruments. T<br />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<br />3-Lateral cutting instruments are have a curved blade called double-planned instruments. T<br />4-Single planned instruments are only used in a direct cutting instrument only.F<br />5-Double planned instruments can only be used on a lateral cutting. T<br />6-An excavator is used for carving.F<br />Circle the correct answer:<br />1-Lateral cutting instruments are those in which the<br />force is applied at the __________ to the plane of the<br />blade and handle.<br />
2-There are many types of bevels:<br /> a. Single, Bi, triple and circumferentially-beveled instruments<br /> b. Triple and Circumferentially beveled instruments<br /> c. none of the above.<br />3-How can we know if the instrument is right or left lateral or mesial?<br />
4-direct and reverse beveled are examples of :<br />
b. GMT<br /> c. Off-set hatchets<br />5-On the shaft of an instrument the numbers engraved indicates:<br /> a. the specific use of an instrument and the numbers are in tenths<br /> b. the specifc use of an instrument and the metric system is used.<br /> c. the specific use of an instrument and the numbers indicate the length of the shaft.<br />6-Angle formers and gingival margin trimmers are the only hand<br />cutting instruments with _________instrument formula.<br />
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.<br /> a.GMT<br /> b. Off- set hatchet<br /> c. chisel<br />8-It is useful for cleaving undermined enamel and its uses are exactly the same as all enamel chisels.<br /> a. excavator<br /> b. triangular chisel<br /> c. off-set hatchet<br />9-They are mainly used to work on dentin. (excavators)<br /> a. hatchet<br /> b. chisel<br /> c. none of the above <br />10-This form of excavator is used for delicate cutting within preparations, especially in incisors.<br /> a. hoe excavator<br /> b. spoon excavator<br /> c. hatchet excavator<br />11- Plastic instruments are made up of.<br />
12-this picture shows an /a <br /> a. applicator<br /> b. amalgam carrier<br /> c. excavator<br />13- Teflon or titanium plated condenser<br />are used for :<br /> a. amalgam restoration<br /> b. gold foil resoration<br /> c. composite restoration<br />Indicate the type of instrument:<br />1- They are mainly designed to cleave undermined enamel and to shape enamel walls, their blades are relatively heavier and beveled on one side<br />only. chisel<br />2-They are used as a scraper of dentin in the internal parts of cavities specially the pulpal walls or floors.Mon-angled chisel<br />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.<br />4-Are used to scoop out the cavities and usually they are rounded with a concavity. Spoon excavator.<br />5- Are used to sharpen point and line angels and their cutting edge is like that of a single hatchet. GMT<br />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<br />7- Excavators that are used to cut mesial and distal walls of molars and premolars. Hoe excavator.<br /> <br />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.<br />9-It is a most helpful instrument for carving gold fail and<br />amalgam, specially for creation of proximal fossae and marginal<br />ridges. Cleoide excavator<br />10- instruments that are used to mix cements together are called. Mixing spatula<br />11-This photos shows a condenser which is used for?<br /> for amalgam<br /> <br />12-This photo shows burnishes which are used for?<br /> for smoothning up the amalgam or restoration.<br />13-This photo shows a cleoid discoid carver and it’s used for?<br /> They can be used as Amalgam<br />and gold carvers.They are used primarily for<br />occlusal carving.<br />14- Disposable scalpel blade<br />Is very useful for carving resin<br />composite restorations.<br />(Lecture 3)<br />Circle the correct answer<br />1-The most universally hand grasp used is:<br /> a. the pen grasp<br /> b. palm and thumb grasp<br /> c. inverted pen grasp<br />2-instruments get dulled by:<br />
4-__________ are tools or attachments that are fitted in the hand piece and work by energy delivered from a source of power.<br /> a. mechanical instruments<br /> b. rotary instruments<br /> c.hand instruments<br />5-_________devised a foot engine that allowed the dentist to<br />keep both hands free while powering the dental drill.<br />
8- _________ burs generate much less heat<br />during cavity preparation because they<br />are more effective cutters, specially at<br />high speed.<br /> a. carbide<br /> b. steel<br /> c. diamond<br />9- ______ burs are used only<br />at low speed ranges.<br /> a. slow<br /> b. steel<br /> c. tungsten carbide<br />10-The more the flutes the<br /> a. the quicker the operation <br /> b. the louder the noise of the instrument<br /> c. the smoother the finishing <br />11- Most of these types of instruments are of<br />great clinical importance, as they are used for<br />removal of hard tooth tissues (enamel) and<br />finishing and polishing most of restorations and they act by friction.<br /> a. excavators<br /> b. abrasives<br /> c. high speed instruments<br />12- These dental stones are classified as : <br />
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).