1_The requirement of good adhesion to the tooth surface are :
a. Good wetting
b. Clean surface
c. Hot surface
d. Both a & b
e. All of the above
Explanation:Good wetting and clean surface this are the requirements for have a good adhesion so that the attachment of one substance is strong and not weak.
2_Etching instrument compose of how many percent phosphoric acid ?
a. 32_37%
b. 50_75%
c. 75%
d. 80% above
e. All of the above
Explanation:32_37% phosphoric is enough to penetrates the irregularities of the occlusal surface,the higher percent is not applicable it can irritate the gingival.
3_What is the etching time for acid etching enamel for permanent tooth that provides adequate microprosity for resin adhesion and sealing, bond strength enough to result in cohesive fracture.
a. 15 seconds
b. 1 minute
c. 2 minute
d. 3 minute
e. None of the above
Explanation: 15seconds is enough to provide adequate microprosityfoe resin adhesion and sealing ,bond strength enough to result in cohesive fracture.
4_A type of taper that is divergence from floor of the cavity preparation outwards.
a. Intracoronal prep
b. Extra coronal prep
c. Both a & b
d. None of the above
Explanation: From the word divergence taper is from the floor of the going to the incisal that ‘s why it is called intracoronal while the extracronal which is means convergence.
5_This is hand cutting instrument except :
a. Excavators
b. Hachets
c. Gingival margin trimmer
d. Chisel
e. None of the above
Explanation: Excavators,hatchets,gingival margin trimmer,and chisel are hand cutting instruments where evrytime we prepare a tooth it can help for our preparation for cutting.
6_Parts of tofflemire matrix band holder except :
a. Sliding body and slot of sliding body
b. Slotted guide
c. Pin
d. Inner knob and outer knob
e. None of the above
Explanation :All of the above are parts of tofflemire matrix band where in all they have own function like the sliding body and slot of the sliding body is to receive the band, inner knob and outer knob engage and disengage the screw slotted guide to guide the band and lastly the pin is to hold the band .
7_In G.V. Black classification cavities on the proximal surface s of incisors in canines that involved the incisal angle is called :
a. Class 4
b. Class 1
c. Class 2
d. Class 5
e. All of the above
Explanation: according to G.V. Black in sturdevant book cavities on proximal surface in incisors that involved the incisal angle is called class 4.
8_according to ADA specification conventional dental amalgams should contain(by weight):
a. 9% tin
b. 43% cooper
c. 65% silver
d. 18% zinc
Explanation :the conventional dental amalgams should contain by weight 65.1 of silver
9_How many line angle would a MOD have ?
a. 6
b. 8
c. 14
d. 18
Explanation : the line angle of MOD is 14 between pulpal,lingual,axial,gingival,buccal axial pulpal wall
10_the radiography of the proximal caries lesion will be appear :
a. smaller than the actual lesion
b. larger than actual lesion
c. as is the actual lesion
d. any of the above
Explanation: proximal caries lesion is smaller than actual lesion,usually be below the contact point.
11_carious dentin that is softer than normal dentin and shows further loss of mineral from the intertubular dentin and may largecrystals in the lumen of the dentinal tubules.
a. Infected dentin
b. Turbid dentin
c. Transparent dentin
d. Affected dentin
e. None of those
Explanation: infected dentin-outermost zone,consist dentin that is teeming with bacteria .
No recognizable structure to the dentin and collagen and mineral seen to be absent.
12_glass ionomer cements were developed to overcomethe following disadvantages of silicate cement:
a. Lack of adhesion to tooth structure
b. Inadequate esthetics
c. Limited utility in mouth breathers
d. All of the above
Explanation: esthetic is not limitation of silicate cement both glass ionomer and cement havelimited utilityin mouth breathers.
13_affected dentin has the following characteristic feature,except:
a. It is the outermost layer
b. It has a hard consistency
c. It can be stained by basic fuschin dye
d. It is capable of remineralization
Explanation: infected dentin is inner layer that has soft consistency and it is not capable of remineralization
14_type iv glass ionomer cement is indicated for:
a. Deciduous tooth restoration
b. Core build up
c. Tunnel preparation and restoration
d. All of the above
Explanation: type iv glass ionomer cement also known as glass ionomer cement.
15_atropin is contraindicated for nursing mother’s and for patients with glaucoma.
a. Yes
b. No
c. Both
d. None of the above
Explanation: yes
16_the individual walls of the isthmus of a proximocclusal inlay should :
a. Be undercut 3 degree
b. Be undercute 16 degree
c. Have a taper of 16 degree
d. Have a taper of 3 degree
Explanation : individual walls of the 1isthmus of a proximocclusal inlay should have be a raper of 3 lacrors for avoid detective or weakened tooth structure.
17_which of the following may be added to zinc oxide-ougenol cement ,in orther to reduce its strengthfor temporary cementation of casting?
a. Cotton fibers
b. Vaseline
c. Zinc phosphate cement powder
d. EBA powder
Explanation: the powder is mostly zinc oxcide & the liquid is orahc-phospheric acid
Explanation: in molar teeth to avoid breakage tooth should have at least one cusp with sound dentin remaining.
18_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
d. Fracture of unsupported enamel
e. All above
Explanation: the acute dental caries is brokendown or softremind of dentin & enamel but chronic dental caries is progresses more rapidly in dentin than enamel.
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