wish some one out here makes it easy....

[gumpads]

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i have trouble answering questions on manibular movement esp when they ask which cusp of mandi moves on which cusps of maxilla....

can any one help me with this plzzzzzzz!!
i came across this question..

the most constant and valuble trait to differentiate among maxillary first, second and third molars is..
1.height of cusps
2.number of roots.
3.depth of central fossa
4.comparitive size of cusp of carabelli
5.relative position of the distolingual groove

can any one asnwer this one for me plz.

 

[toofache32]

I would guess 5.

 

[gumpads]

ya thats the answer can u give reason!
thanks for reply.

 

[toofache32]

Well, I thought it was self-explanatory but here goes: in the 1st molar the distolingual groove is more mesial, which makes the distolingual cusp relatively large. In the 2nd molar, the distolingual groove is more distal making the distolingual cusp smaller. In the 3rd molar, the distolingual groove is much more distal and often not present.

 

[BDS-DMD]

Actually its the size of the Dl cusp which becomes smaller and smaller and hence the position of the groove changes.

 

[ckrdds]

Isnt the main difference between the max molars the size of the cusp of carabelli? It is prominent in the first, small to missing in the second, and usually missing in the third???

 

[drhobie7]

Isnt the main difference between the max molars the size of the cusp of carabelli? It is prominent in the first, small to missing in the second, and usually missing in the third???

The cusp of carabelli is only found on the maxillary 1st molars. 2nd and 3rd do not have them.

 

[DcS]

The word "constant" is important in this context. Just about all of those aspects would aid you in distinguishing between maxillary molars, but numbers 1,3 and 4 are all highly variable from one person to the next. That alone should make number 5 stand out, and then with the proper dental anatomy knowledge it certainly is the correct choice.

 

[toofache32]

The cusp of carabelli is only found on the maxillary 1st molars. 2nd and 3rd do not have them.

That's what I remember, but then again it's been a long time since I read Wheeler's.

 

[Supernova2008]

There is one key fact that makes all of the cuspal pathways during any type of mandibular movement easy to figure out...each mandibular tooth is always positioned mesial and lingual to its counterpart in the maxillary arch...I cannot tell you just how much easier that this one fact makes all of those questions. As long as you realize that the mandible is the only arch that moves, and that this relationship always exists for any tooth, this eliminates the need to draw the pickett fence diagrams and any of that other crap they teach you in dental school...try this relationship out on a couple of questions and you will see what I mean

i have trouble answering questions on manibular movement esp when they ask which cusp of mandi moves on which cusps of maxilla....

can any one help me with this plzzzzzzz!!
i came across this question..

the most constant and valuble trait to differentiate among maxillary first, second and third molars is..
1.height of cusps
2.number of roots.
3.depth of central fossa
4.comparitive size of cusp of carabelli
5.relative position of the distolingual groove

can any one asnwer this one for me plz.

 

[booshwa]

There is one key fact that makes all of the cuspal pathways during any type of mandibular movement easy to figure out...each mandibular tooth is always positioned mesial and lingual to its counterpart in the maxillary arch...I cannot tell you just how much easier that this one fact makes all of those questions. As long as you realize that the mandible is the only arch that moves, and that this relationship always exists for any tooth, this eliminates the need to draw the pickett fence diagrams and any of that other crap they teach you in dental school...try this relationship out on a couple of questions and you will see what I mean

Wow, it all makes sense now! Thanks so much for the helpful guideline. I (we) didn't realize that only the mandible moves. Furthermore, the tip about mandibular teeth being mesial and lingual to its corresponding teeth-I don't know why I never realized that before. I feel so dumb right now, but yet so much smarter. Thanks a ton!

 

[ItsGavinC]

Actually its the size of the Dl cusp which becomes smaller and smaller and hence the position of the groove changes.

I beg to differ. The position of the groove changes, which changes the cusp size.
🙂

 

[Demeter]

There is a great section about occlusion in the Kaplan test book for the Boards part 1. you should find someone you has it and copy the section.

 

[toofache32]

I beg to differ. The position of the groove changes, which changes the cusp size.
🙂

I didn't want to get into it....chicken or the egg?

 

[Supernova2008]

yep...definitely the chicken first

I didn't want to get into it....chicken or the egg?