PoojaLV

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10+ Year Member
Apr 17, 2008
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Hi everyone,

I have my part 1 exam in a couple of weeks and was hoping someone could assist me with these 2 questions below. I can't seem to find the correct answer for these anywhere. Thanks :)

1. As a carious lesion progresses from a smooth enamel surface to the DEJ, the lesion travels:

a) in random directions through the enamel
b) only through the bottom of pits and fissures in the tooth crown
c) at a right angle to the long axes of the affected enamel rod
d) parallel to the long axes of the enamel rods
e) at a constant rate through the enamel


2) Inorganic crystals in enamel have their axes parallel to the rods in which of the following?
a) centers of the bodies of the rods only
b) periphery of the bodies of the rods only
c) bodies of the rods and deviating increasingly in the tails
d) tails of the rods and deviating increasingly from the cens of the bodies to the periphery
3) tails of the rods and deviating increasingly from the periphery of the bodies to the centers.
 

nbpoise

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Dec 31, 2007
166
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hi pooja,

Are you done with your exams? Hope yoiu did great. IS the NBDE part 1 material still available ?
Im from india and planning to give my boards soon , pls let me know
thanks
 

d dimps

d dimps
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7+ Year Member
Feb 29, 2008
186
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  1. Dental Student
Hi everyone,

I have my part 1 exam in a couple of weeks and was hoping someone could assist me with these 2 questions below. I can't seem to find the correct answer for these anywhere. Thanks :)

1. As a carious lesion progresses from a smooth enamel surface to the DEJ, the lesion travels:

a) in random directions through the enamel
b) only through the bottom of pits and fissures in the tooth crown
c) at a right angle to the long axes of the affected enamel rod
d) parallel to the long axes of the enamel rods
e) at a constant rate through the enamel


2) Inorganic crystals in enamel have their axes parallel to the rods in which of the following?
a) centers of the bodies of the rods only
b) periphery of the bodies of the rods only
c) bodies of the rods and deviating increasingly in the tails
d) tails of the rods and deviating increasingly from the cens of the bodies to the periphery
3) tails of the rods and deviating increasingly from the periphery of the bodies to the centers.

i think this is the ans.plz post the right answer.
 

oralcare

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10+ Year Member
Oct 27, 2008
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1. As a carious lesion progresses from a smooth enamel surface to the DEJ, the lesion travels:

a) in random directions through the enamel
b) only through the bottom of pits and fissures in the tooth crown
c) at a right angle to the long axes of the affected enamel rod
d) parallel to the long axes of the enamel rods
e) at a constant rate through the enamel


2) Inorganic crystals in enamel have their axes parallel to the rods in which of the following?
a) centers of the bodies of the rods only
b) periphery of the bodies of the rods only
c) bodies of the rods and deviating increasingly in the tails
d) tails of the rods and deviating increasingly from the cens of the bodies to the periphery
3) tails of the rods and deviating increasingly from the periphery of the bodies to the centers.
 
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sohum

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10+ Year Member
Oct 30, 2008
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hi, i am taking part 1 in feb 2009,mail me at [email protected] we can discuss over phone or mail.i live in ft.lauderdale anybody nearby pl lets get together and discuss anybody from florida pl mail me.
 

d dimps

d dimps
10+ Year Member
7+ Year Member
Feb 29, 2008
186
0
Status (Visible)
  1. Dental Student
Hi everyone,

I have my part 1 exam in a couple of weeks and was hoping someone could assist me with these 2 questions below. I can't seem to find the correct answer for these anywhere. Thanks :)

1. As a carious lesion progresses from a smooth enamel surface to the DEJ, the lesion travels:

a) in random directions through the enamel
b) only through the bottom of pits and fissures in the tooth crown
c) at a right angle to the long axes of the affected enamel rod
d) parallel to the long axes of the enamel rods
e) at a constant rate through the enamel


2) Inorganic crystals in enamel have their axes parallel to the rods in which of the following?
a) centers of the bodies of the rods only
b) periphery of the bodies of the rods only
c) bodies of the rods and deviating increasingly in the tails
d) tails of the rods and deviating increasingly from the cens of the bodies to the periphery
3) tails of the rods and deviating increasingly from the periphery of the bodies to the centers.



2)bodies of the rods and deviating increasingly in the tails


As we know rods have a keyhole pattern and enamel indicating orientations of apatite crystals . these crystals areoriented parallelto long axis of "bodies" of the rods and fan out at an angle of approximately 65 degrees in the "tails". of rods.
 
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