nbde part one doubt

[nisreen]

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hi..i didn't understand a question from test packet I-L, question 206... if someone could please explain....

The horizontal plane diagram shows each of the following components of mandibular movement except one..( diagram shown )

A) vertical componenet of movement from retruded contact postion to intercuspal position
B) horizontal component of movement from RCP to ICP
C) anterior component of movement from ICP to maximum protrusive position
D) lateral component of movement from RCP to ICP
E) mandibular movements occuring laterotrusively

the answer is given as A..
thanks...

 

[DrTacoElf]

A horizontal plane is like if you chop someones head off with a knife (the path the knife would take is parallel to the ground). Therefore it is only able to show motion in that plane which has no vertical component. On CT scans this is called axial.

 

[nisreen]

thank you very much for explaining Dr TacoElf...

can someone please explain the following question
Q:195 from test packet I-L..

Clinical examination reveals that the lingual cusp on tooth#5 is broken off. this is MOST likely due to which of the following mandibular movements during trauma ?...the answer is given as left mesiotrusive..

thanks a lot..

 

[DrTacoElf]

thank you very much for explaining Dr TacoElf...

can someone please explain the following question
Q:195 from test packet I-L..

Clinical examination reveals that the lingual cusp on tooth#5 is broken off. this is MOST likely due to which of the following mandibular movements during trauma ?...the answer is given as left mesiotrusive..

thanks a lot..

Because the mandibular teeth have a lingual inclination (curve of wilson), the buccal cusps are at the level of the lingual cusps or higher (usually higher in the premolar area because of this curve and because of the fact that the lingual cusps in general are smaller. The lingual cusp of #5 sits on the distal marginal ridge of #28. A mediotrusive movement for the left condyle (a right working) will cause the buccal cusps of the mandibular teeth to have to pass under the maxillary lingual cusp, therefore an interference is likely (interference = crash = broken cusp tip)

 

[nisreen]

hi.. thanks DrTacoElf for explaining... i still didn't understand.. shudn't answer be right mediotrusive?

 

[Boetlaar]

No, right working side movement is right laterotrusive which means that the left will be going mediotrusive. As the left mandibular teeth move medially(i.e. to the right) the mand buccal cusp can hit the max ling. Think about it... it will come.

 

[nisreen]

hi boetlaar.. thanks a lot for replying...

 

[nisreen]

In a left lateral movement, which cusp of the mandibular first molar has the potential to contact the mesiolingual cusp of the maxillary right first molar?

A) distal
B)distofacial
C)mesiolingual
D)distolingual

 

[Dentstu]

In a left lateral movement, which cusp of the mandibular first molar has the potential to contact the mesiolingual cusp of the maxillary right first molar?

A) distal
B)distofacial
C)mesiolingual
D)distolingual

anwser to this question should be distolingual, because on non-working side in case of lateral movement, mandible moves forward and medially. So the mandibular holding cusp moves up the distal slope of maxillary holding cusp, immediately mesial to it.

 

[Ice2remember]

agree with dentsu.the answer is distolingual.

 

[nisreen]

hi.. thanks for replying... i thought the answer would be distofacial...😕

i'm getting really confused with these occlusion questions and i'm taking the exam in 2 weeks..... dont know how to clarify these basic concepts... suggestions anyone..please..

 

[Boetlaar]

I'll be honest in saying that I would think it would be the distofacial as well. Since the distofacial cusp of #30 would be in the central fossae of #3, as it trys to move to medially during left laterotrusion it would have to pass over the mesiolingual cusp of #3. The lingual cusps of #30 are already medial (lingual) to the lingual cusps of #3 and would only move further away during it's mediotrusion. Where am I messing up??

 

[Dentstu]

hi.. thanks for replying... i thought the answer would be distofacial...😕

i'm getting really confused with these occlusion questions and i'm taking the exam in 2 weeks..... dont know how to clarify these basic concepts... suggestions anyone..please..

Go through Kaplan Review Book , page number 804.
Just remember the direction of mandible movement on both working and non-working sides and the intercuspal position of cusps in ideal occlusion. From these you can conclude. If still doubtful, we can discuss it.

Hope this may help you.

 

[Dentstu]

I'll be honest in saying that I would think it would be the distofacial as well. Since the distofacial cusp of #30 would be in the central fossae of #3, as it trys to move to medially during left laterotrusion it would have to pass over the mesiolingual cusp of #3. The lingual cusps of #30 are already medial (lingual) to the lingual cusps of #3 and would only move further away during it's mediotrusion. Where am I messing up??

Ya Boetlaar is right, it is distofacial because it is the holding cusp not distolingual. I am sorry, i mistyped distolingual.

 

[nisreen]

thanks for clarifying and helping me out...

 

[nisreen]

No, right working side movement is right laterotrusive which means that the left will be going mediotrusive. As the left mandibular teeth move medially(i.e. to the right) the mand buccal cusp can hit the max ling. Think about it... it will come.

if the mandibular buccal cusp can hit the maxillary lingual cusp in a mediotrusive movement, and according to the question.. since lingual cusp on tooth#5 is broken, shouldnt the movement causing trauma to the maxillary right premolar be a right mediotrusive?

 

[Ice2remember]

hi.. thanks for replying... i thought the answer would be distofacial...😕

i'm getting really confused with these occlusion questions and i'm taking the exam in 2 weeks..... dont know how to clarify these basic concepts... suggestions anyone..please..

oops.........thought the question was about left maxillary first molar not right.right is distofacial and on left side will be distolingual.😀

 

[nisreen]

1)The luminal contents of thyroid follicles:
A) are in direct contact with the thyroid follicular cells ( ans ? )
B) are endocytosed by the parafollicular cells
C) contain thyroxine but not tri-iodothyronine
d) pass directly into the capillary network


2)The pulp chamber decreases in volume with age due to :
a)formation of pulp stones
b)shrinkage of pulp tissue
c)formation of sclerotic dentin
d)development of secondary dentin ( ans ? )

3) In ahealthy individual, particles or bacteria in the air that succeed in reaching the alveoli can be removed by :
a)dust cells ( ans ? )
b)Clara cells
c)pulmonary epithelial cells
d)diffusion into the pulmonary capillaries

4) which cartilage has the least amount of ground substance?
a)elastic
B)hyaline
c) calcified
d)fibrocartilage

5) CSF is reabsorbed into which of the following sinuses?
a)sigmoid
b)inferior petrosal
c)superior sagittal
d)superior petrosal

a or c?

 

[nisreen]

if anyone knows the answers for the questions i've put up, please post them...thanks...

 

[NBDE Part1]

1)i think you are confusing b/n follicular n parafollicular cells. Parafollicular cells are scattered among follicular cells n they secrete CALCITONIN.they are also called C-cells.
2)with age, pulp shows increase in fibrous n decrease in cellular content. secondary dentine deposition occurs wid age in response to all the minor irritations n trauma to the tooth to protect the pulp.
3) Dust cells is the other name of ALVEOLAR MACROPHAGES found on alveolar surface. They phagocytose the bacteria.
4) it think it shud be calcified cartilage but i m not sure..
5)CSF is reabsorbed via ARACHNOID GRANULATIONS which are most numerous in Sup. Sagittal Sinus..

i hope this helps..any corrections in my answers are welcome!🙂

 

[sara.riazi]

I think exactly the same way I think it should be right mesiotrusive,not left one.I'm also confused because the answer choices give u both right mesiotrusive and left latrusive which is the same to me.If it moves mesially on the right so its moving lateraly on the left.isn't it right?don't u guys think the answer choises r problematic?!

if the mandibular buccal cusp can hit the maxillary lingual cusp in a mediotrusive movement, and according to the question.. since lingual cusp on tooth#5 is broken, shouldnt the movement causing trauma to the maxillary right premolar be a right mediotrusive?

 

[rayman]

if anyone knows the answers for the questions i've put up, please post them...thanks...

Hi nisreen
my names Mamoun i came to USA recently .
i hope you will help me
may i am late, but plz if you read my post let me know
i am really need some help
Thank you so much

 

[wdent]

1)The luminal contents of thyroid follicles:
A) are in direct contact with the thyroid follicular cells ( ans ? )......i think so!
B) are endocytosed by the parafollicular cells
C) contain thyroxine but not tri-iodothyronine
d) pass directly into the capillary network


2)The pulp chamber decreases in volume with age due to :
a)formation of pulp stones.........answer (increase in collagen and calcification ,called denticles or PULP STONES)😎
b)shrinkage of pulp tissue
c)formation of sclerotic dentin
d)development of secondary dentin ( ans ? )

3) In ahealthy individual, particles or bacteria in the air that succeed in reaching the alveoli can be removed by :
a)dust cells ........answer (because they r the alveolar macrophages )😎
b)Clara cells
c)pulmonary epithelial cells
d)diffusion into the pulmonary capillaries

4) which cartilage has the least amount of ground substance?
a)elastic
B)hyaline
c) calcified
d)fibrocartilage

5) CSF is reabsorbed into which of the following sinuses?
a)sigmoid
b)inferior petrosal
c)superior sagittal
d)superior petrosal........answer for sure 😎

a or c?

Pls correct me if iam wrong !!!
All best frm Wdent 🙂

 

[colours99]

The answer is C) sup sagital sinus because arachnoid mater projects into the superior sagittal sinus to form arachnoid villi.

"5) CSF is reabsorbed into which of the following sinuses?
a)sigmoid
b)inferior petrosal
c)superior sagittal
d)superior petrosal....answer for sure"

 

[wdent]

The answer is C) sup sagital sinus because arachnoid mater projects into the superior sagittal sinus to form arachnoid villi.

"5) CSF is reabsorbed into which of the following sinuses?
a)sigmoid
b)inferior petrosal
c)superior sagittal
d)superior petrosal....answer for sure"

Hey colors and others heylets try to solve nisreen's questions the rest of them ..