74. At which of the following ages does fetal movement first occur?

A. 1 month B. 2 months

C. 4 months D. 6 months E. 7 months


The correct answer is B. Neuromuscular development is sufficient to allow fetal movement in the

eighth week of life. Other features of Week 8 include the first appearance of a thin skin, a head as

large as the rest of the body, forward-looking eyes, appearance of digits on the hands and feet,

appearance of testes and ovaries (but not distinguishable external genitalia), and a crown-rump length

of approximately 30 mm. By the end of the eighth week, nearly all adult structures have at least begun to 

develop, and the fetus "looks like a baby." 

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73. Mosquito borne transmission appears to be the method of spread in:

a. St. Louis encephalitis   b. Histoplasmosis

c. Typhus  d. Toxoplasmosis

ANS.  A



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72. Which cusp on the primary mandibular first molar is highest and sharpest?

A. Mesiobuccal       B. Distobuccal

C. Mesiolingual        D. Distolingual



ANS.  C. The primary first mandibular molar is a highly unusual tooth. It is molar-like

in form, with two roots (mesial and distal), but has a very pronounced mesial development of the

crown. The mesial section comprises two-thirds of the crown, and the distal portion is much reduced.

The mesiolingual cusp is the highest and sharpest, although the mesiobuccal is overall largest as

viewed from the occlusal. It is followed in size by the ML, DB, and DL cusps.

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71.The vitamin that can be synthesized by microorganisms only:

1. Cobalamine.2. Folic acid.

3. Niacin. 4. None.

ANS. 1

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70. ANB angle of 2? indicates:

A. A favorable relationship of maxillary alveolar base to Mandibular alveolar base
B. A favorable relationship of mandible to cranium.
C. Poor cranial growth
D. Upright incisors

Ans A

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69.Which type of dentin is most regular in structure?

A. Primary B. Secondary
C. Reparative dentin
D. All have the same

ANS>a
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68. Internal resorption is :

a)radiolucency over unaltered canal

b) usually in a response to trauma

c) radiopacity over unaltered canal

ANS b

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67.The best way to clean the cavity before the placement of G.I.C is.

a )H2o2 b) phosphoric acid

c)poly acrylic acid

Ans. c

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Introducing Dr. Amir from Egypt

I am glad to introduce to you all Dr. Amir from egypt who will serve you with his valuable experience and knowledge.He joins RxMcq's as a co author to me.

Name>Dr. Amir Elmoamnein Abdelaty Awad

Age.33
Address. Arab republic of egypt almansoura dakahlia

Occupation.endodontist

Certificates.
1-bachelor of oral and dental surgery 2000 almansoura unveristy

2-diplomate in endodontic 2005

Thanx Dr. Amir for joining

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66.Files are used in endodontic preperation to:

1.clean 2.shape

3.improve access 4.facilitate obturation

a.all b.1,2,3 c.1,2,4 d.2,3,4

ANS : c

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65. which of the following represents the most significant advantage of using acid etch techinque :

1.microleakage 2.setting shrinkage of restorative material

3.coefficient of thermal expansion of restorative material

4.reduced porosity of restoration


ANS. 1.
Microleakage

in this procedure the tooth surface enamel is treated for about for about one minute with acid etch solution or gel 30-50%phosphoric acid.

CONTRIBUTED BY: Dr. AMIR FROM EGYPT

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64.E.D.T.A. is chelating agent that:

1.lubricates

2.emulsifies

3.hold debris in suspension

4.remove smear layer

5.all of the above

ANS. 5

REF.pathway of the pulp eighth edition p.259

CONTRIBUTED BY: Dr. AMIR FROM EGYPT

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63.Injury at the lower border of a rib will most likely damage which structure?

A. intercostal a. B. intercostal n.
C. intercostal v. D. internal intercostal muscle

ANS>B. The three structures in the intercostal space are, from superior to inferior, the intercostal vein, artery, and nerve. The proper site for insertion of an intercostal drain is superior to a rib, not directly at the level of the superior border but slightly higher to avoid the collateral branches of the nerve, artery, and vein. The nerve is the most inferior structure and thus most likely to be damaged by the drain (producing an anesthetic dermatome). In addition, the nerve is the least protected by the costal groove.

The intercostal artery (choice A) is the middle structure and thus is not the most likely to be damaged.

The intercostal vein (choice C) is the most superior structure and is thus the least likely to be damaged. In addition, the vein is the structure best protected by the costal groove (the further superior the structure, the more protected by the costal groove).

The internal intercostal fibers (choice D) will tend to be separated by the drain. In addition, the internal intercostal muscle is membranous (internal intercostal membrane) posteriorly, from the neck of the rib to its angle; therefore, many drains, when inserted, will not even pass through a layer of internal intercostal muscle.


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62.A trauma patient is bleeding in the casualty. The immediate measure of management would be:

1.Suture the tongue with silk 2.Use towel clip

3.Oro-pharyngeal airway 4.Definite airway

ANS.4

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61.Gingivoplasty is not indicated in all the following except:

1.ANUG 2.Desquamative gingivitis
3.Acute herpetic gingivitis 4.Erosive lichen planus


ANS. 1


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