1.G.V.Black Class IV cavity is described as
A. a large Class II cavity
B. a cavity on the proximal surface of an anterior tooth, including the incisal angle
C. a carious lesion involving the proximal surface of an anterior tooth, extending up to but not
Including the incisal angle
D. a cavity involving only the incisal edge of an incisor
AMSWER:B
according to G.V.Black class IV caries classification is described as cavities on the proximal surface of incisors and canines that involve the incisal angle.
2. A cavity originating at which of the following sites cannot be Classified as Black’s Class 1
A. Labial
B. Occlusal fissures
C. Cingulum pits incisors
D. Lingual Fissures
E. None of the above
Answer:A
According to G.V.Black’s classification
there is not any caries in labial surface.
3. The cavosurface line angle for a dental amalgam restoration may be
A.45
B.110
C.less than 90
D.90
E.135
Answer:B
This will provide adequate bulk of amalgam and not a thin flange of amalgam at the cavosurface margin.
4. The objective of carving an amalgam restoration is to
A.produce extremely fine surface details
B.remove excess mercury
C.simulate the anatomy of the tooth
D.smoothen the surface of the restoration
Answer:C
Should be simulate the anatomy of tooth for definit physical and mechanical principle.
5. The individual walls of the isthmus of a proximocclusal inlay should
A. be undercut 3°
B. be undercut 16°
C. have a taper of 16°
D. have a taper 3°
Answer:D
For easy removal of primary impression and insert of inlay material.
6.Radiographically a proximal carious lesion will appear
A.smaller than the actual lesion
B.larger than the actual lesion
C.as is the size of the actual lesion
D.any of the above,depending on the film speed and the exposure time
Answer:A
Becouse of angle of tube to tooth cause appear smaller.
7.Dental caries can be diagnosed accurately without using radiographs when
A.the patient is pregnant
B.only deciduous teeth are present
C.only premolar and molar teeth are present
D.the tooth has previousely been restored with a full cast crown
E.none of the above
Answer:E
Because all of above can be diagnosis without using radiograph.
8. Which of the following permanent teeth are least susceptible to carious attack?
A. mandibular molars
B. maxillary canines
C. maxillary premolars
D. mandibular incisors
E. maxillary incisors
Answer:D
Becouse of position of tooth with tongue.
9. Acute dental caries differs from chronic dental caries, in that, there is
A. greater depth than width to the lesion
B. usually very little sensitivity
C. much greater pigmentation of the lesion
D. fracture of the unsupported enamel
E. all of the above
Answer:A
Because of greater depth in acute dental caries and closer of caries to dental pulp.
10. Which of the following is not true regarding the use of twist drills?
A. spiral drills should never be used in a slow speed handpiece
B. The drill must not stop rotating while in the pin hole
C. They cut only at the tip
D. A pumping action is used to aid in chip removal
E. None of the above.
Answer:A
Because we can use spiral drills in high speed handpiece.
11. A No.4 bur is
A. a straight fissure bur
B. an inverted cone bur
C. a round bur
D. a cross-cut tapered fissure bur
Answer:C
According to classification of bur.
12. Following restoration with gold, the tooth was sensitive to pressure, cold and heat, the best course of action is to
A. remove the restoration and start endodontic treatment
B. remove the restoration and place a sedative temporary restoration
C. relieve the tooth on any occlusal contact
D. observe for two weeks and then decide
Answer:B
We should remove the restoration and place the temporary restoration for observe pulpal condition is involve or not.
13. Which of the following is not true when fixing the matrix band for filling a Class 2 cavity with amalgam? The matrix band should
A. fit the cervical margin of the proximal box loosely
B. be higher than the occlusal surface of the tooth
C. support the marginal ridge of the restoration during amalgam packing
D. provide a physiological contour for the proximal surface of the
restoration
Answer:A
Becouse if we loose the matrix band in cervical margin cause to create bulky restoration.
14. The main purpose of finishing the enamel wall of a prepared cavity is to
A. smoothen the walls of the cavity to permit accurate adaptation of the restorative material
B. remove loose enamel rods
C. ensure parallelism of the walls
D. allow the cavity-material junction to be properly polished
Answer:B
Becouse loose enamel rods decrease adhesive of restoration material to wall of cavity.
15. Marginal adaptation of composite resin restorations can be most improved by
A. proper packing of the restoration
B. using the correct powder-liquid ratio when mixing the resin
C. acid etching
D. maintaining pressure till the material sets
Answer:C
Etching of cavity cause rough surface and increase marginal adaptation.
16. The shank of a dental hand cutting instrument joints the blade to the
A. hand
B. handle
C. primary cutting edge
D. secondary cutting edge
Answer:B
According to instrument part of hand instrument .
17. The first number on those instruments having three-number formula, indicates the
A. length of the blade in millimeters
B. width of the blade in tenths of a millimeter
C. angle of the blade to the shaft in degrees centigrade
D. length of the blade in tenths of a millimeter
E. length of the handle in millimeters
Answer:B
Becouse the others is not include the three-number of formula.
18. Dental amalgam, when used in the restoration of a cusp should be
A. carved out of occlusal
B. supported by a pin
C. at least 2 to 3mm thick
D. supported by enamel
Answer:C
To prevent of break of amalgam during the mastication.
19. The permanent teeth most susceptible to caries are
A. maxillary premolars
B. mandibular first molars
C. maxillary canines
D. maxillary third molars
Answer:B
Becouse of position,it’s hard to brush
And early eruption.
20. The most grasp used in operative dentistry is the
A. palm and thumb grasp
B. modified pen and thumb grasp
C. pen grasp
D. inverted pen grasp
Answer:C
Becouse pen grasp gives a more stabilized,flexiblesafer grasp.
No comments:
Post a Comment