quick Dent Anat Q

[sjdent]

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On the '89 boards, I have two questions for you guys.

#40 says that when viewing a perm max canine from the M, a line bisecting the root longitudinally would pass LINGUAL to the cusp tip. I thought a max canine was centered facially-lingually, as were all the maxillary anteriors as well as premolars.

Also, the FIRST SUCCEDANEOUS TOOTH TO ERUPT is.......mand central incisor or mand 1st molar? I'm finding differing opinions on these, in the old tests and Kaplan.

Thanks, guys!

 

[UNLV OMS GUNNABE]

permanent 1st molars arn't succedaneous.

 

[ItsGavinC]

Yeah, it's got to be the mandibular central because of what my colleague from UNLV said. Succedaneous teeth are teeth that suceed other teeth in the arch. There aren't any molars in the primary arch, so molars aren't even options.

For the other question: the anteriors are all centered faciolilngually, but that has nothing to do with roots, only the positions of the incisal edges when viewed from an incisal view.

When viewed from the mesial or distal, a line bisecting the root has the following properties for the following teeth:

Max central & lateral: on the line
Max canine: labial to the line
Mand central, lateral, & canine: lingual to the line

Pretty easy trends to remember. So, the answer to your question should be LABIAL (or FACIAL) to the cusp tip. I think the key and Kaplan are wrong on this one. Note that the only place I can find those trends I just posted are in the notes from our DA instructor. None of my books pulled any hits when I searched for that info.

 

[sjdent]

thanks guys. brain fart on the succedaneous question, obviously.

thanks for confirming that the answer key was wrong. that threw me for a loop.

finding numerous wrong answers in the answer keys - frustrating.

 

[sjdent]

kaplan says about max canine, "...The incisal edge is generally centered over the tooth labiolingually."

 

[sjdent]

oh geez, i know what the problem is. i've been studying TOO DAMN LONG. Nothing is making sense anymore - it's the weirdest feeling! Can't remember when I've been this burned out.

 

[wiztooth]

On the '89 boards, I have two questions for you guys.
#40 says that when viewing a perm max canine from the M, a line bisecting the root longitudinally would pass LINGUAL to the cusp tip. I thought a max canine was centered facially-lingually, as were all the maxillary anteriors as well as premolars.

The given answer is correct!from wheeler's on the mesial aspect of max canine,a line bisecting the cusp is labial to a line bisecting the root....in the sense a line bisecting the root longitudinally will be lingual to the cusp tip.Hope it's not too confusing! 🙂

 

[ItsGavinC]

Okay, so the trends I posted then are for a line bisecting the cusp, and the position of that line is:

Max central & lateral: on the line bisecting the root
Max canine: labial to the line bisecting the root
Mand central, lateral, & canine: lingual to the line bisecting the root

 

[sjdent]

hi guys. Where does the thoracic duct drain from......enters into jxn of left int. jugular/subclavian.....it drains just L side?? What is the comparison b/t drainage of left and ride. Thanks.

 

[ItsGavinC]

hi guys. Where does the thoracic duct drain from......enters into jxn of left int. jugular/subclavian.....it drains just L side?? What is the comparison b/t drainage of left and ride. Thanks.

The right lymphatic duct drains the right side of the head and the right arm. The thoracic duct drains everything else in the body.