Thank you for all the work you have taken to publish your wonderful series of histology and pathology videos. They are awesome. I am professor of histology in a dentistry faculty, and I commonly use your videos in my lectures. I appreciate a lot their clarity and simplicity. Nevertheless, I detected some mistakes in this particular video, which I'd be glad to share with you. Contact me if you wish:gaskon.ibarretxe@ehu.es. Thank you so much, and keep going.
I think the lecturer is wrong at the end (not a big deal, he is a general hystologist and may not remember everything). What he calls ameloblasts are actually odontoblasts. If that was enamel there were no dentin inward to that and we see the pulp, cell free zone, and cell rich zone.
I'm aware that this is a cross section, but in cross section, is there any place in the tooth where the enamel is continuous with the dental pulp? That sounds weird to me =/ Great job on the first minutes of the video doc, but could you please tell if you got the last slide wrong?
you're wrong the pink stuff is enamel. What he's showing in the last picture is a cross section of a tooth. The cells he showed on the inside though are odontoblasts. What you think are dentin tubules are actually enamel rods which look similar but are not the same..hope this helps
The pink stuff cannot be enamel. What he is showing is a decalcified section of a tooth, and enamel is not visible in a decalcified section as it is over 95% mineral. The pink stuff is dentine as it is adjacent to the pulp cavity and at the higher magnification you can see the band of paler pink predentine which is formed by the odontoblast cells from the pulp.
During tooth development, the dentine begins to form first, before enamel, and they both grow out the way from the junction between them
What the author said is accurate, maybe just not as detailed. The material represented in pink is enamel because the Tomes process are respresented there along the entire enamel structure.
Just beyond the pink is a very light pink line almost white and that is the "old basement membrane" which now has become the DEJ. And going up beyond that, you can see the different cells and its nuclie. Those cells that are still lined along the DEJ are odontoblast, and you can see the low columnar shape of them. What might be confusing is that i think this is a horizontal cross section of the tooth so the dentin tubles are not clearly seem.
ok, however, the narrator said that the specimen shown at the end may be from an adult, suggesting that tooth development is complete at this stage. Therefore, ameloblasts (and hence Tomes' processes) should not be present at all. Also, shouldnt the ameloblasts, when present, be found to the side of the enamel opposite to the DEJ?
yep the ameloblast migrates outwards laying enamel down as it goes and the odontoblast migrates inwards away from the ameloblast to form dentin. the ameloblasts then becomes the reduced enamel epithelium (if i'm not wrong) and then gets lost when during eruption. If fluid accumulates between the reduced enamel eptihelium and the tooth crown, you'll get a dentigerous cyst
Ibrowz is correct. Ameloblasts end up OUTSIDE the enamel and are gone once the tooth erupts. The cells secreting the pink predentin which the becomes the dark pink dentin are odontoblasts and those processes are dentil tubules which are empty in a healthy adult tooth
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
Steve Weimer is an honorable man!
dpelst 3 weeks ago
the ameloblast die ones they create the enamel. they move outwards. the odontoblasts make dentin and grow towards the pulp.
endol89 2 months ago
Greetings to WDeceit
Thank you for all the work you have taken to publish your wonderful series of histology and pathology videos. They are awesome. I am professor of histology in a dentistry faculty, and I commonly use your videos in my lectures. I appreciate a lot their clarity and simplicity. Nevertheless, I detected some mistakes in this particular video, which I'd be glad to share with you. Contact me if you wish:gaskon.ibarretxe@ehu.es. Thank you so much, and keep going.
Ibarretxegaskon 11 months ago
This has been flagged as spam show
We hit it off so well after another visit busizz4me.info
vmasaatukorala 1 year ago
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boelens15080 1 year ago
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boelens15080 1 year ago
now this is what i am looking for thanksssssssssss:-)
sonal70 1 year ago
I think the lecturer is wrong at the end (not a big deal, he is a general hystologist and may not remember everything). What he calls ameloblasts are actually odontoblasts. If that was enamel there were no dentin inward to that and we see the pulp, cell free zone, and cell rich zone.
nargizkin 1 year ago 7
is your wife calling?
pakiboy1988 2 years ago
Very nice pictures, even at great magnification the details are definately there.
SakuraValley 2 years ago
"last but not least" this video is great XD
protobuddha 2 years ago
I'm aware that this is a cross section, but in cross section, is there any place in the tooth where the enamel is continuous with the dental pulp? That sounds weird to me =/ Great job on the first minutes of the video doc, but could you please tell if you got the last slide wrong?
AndreasDahl87 2 years ago
you're wrong the pink stuff is enamel. What he's showing in the last picture is a cross section of a tooth. The cells he showed on the inside though are odontoblasts. What you think are dentin tubules are actually enamel rods which look similar but are not the same..hope this helps
MrUser9999 2 years ago
The pink stuff cannot be enamel. What he is showing is a decalcified section of a tooth, and enamel is not visible in a decalcified section as it is over 95% mineral. The pink stuff is dentine as it is adjacent to the pulp cavity and at the higher magnification you can see the band of paler pink predentine which is formed by the odontoblast cells from the pulp.
During tooth development, the dentine begins to form first, before enamel, and they both grow out the way from the junction between them
fr45er 2 years ago
@fr45er
What the author said is accurate, maybe just not as detailed. The material represented in pink is enamel because the Tomes process are respresented there along the entire enamel structure.
SakuraValley 2 years ago
@fr45er
Just beyond the pink is a very light pink line almost white and that is the "old basement membrane" which now has become the DEJ. And going up beyond that, you can see the different cells and its nuclie. Those cells that are still lined along the DEJ are odontoblast, and you can see the low columnar shape of them. What might be confusing is that i think this is a horizontal cross section of the tooth so the dentin tubles are not clearly seem.
SakuraValley 2 years ago
ok, however, the narrator said that the specimen shown at the end may be from an adult, suggesting that tooth development is complete at this stage. Therefore, ameloblasts (and hence Tomes' processes) should not be present at all. Also, shouldnt the ameloblasts, when present, be found to the side of the enamel opposite to the DEJ?
fr45er 2 years ago
cool. funny accent though. like he almost said Asteoblast.
zonerboi22 2 years ago
thank you! thus really helped me :D
999peaceangel 2 years ago
yep the ameloblast migrates outwards laying enamel down as it goes and the odontoblast migrates inwards away from the ameloblast to form dentin. the ameloblasts then becomes the reduced enamel epithelium (if i'm not wrong) and then gets lost when during eruption. If fluid accumulates between the reduced enamel eptihelium and the tooth crown, you'll get a dentigerous cyst
tuftthewhale 3 years ago
Ibrowz is correct. Ameloblasts end up OUTSIDE the enamel and are gone once the tooth erupts. The cells secreting the pink predentin which the becomes the dark pink dentin are odontoblasts and those processes are dentil tubules which are empty in a healthy adult tooth
Bearchild2185 3 years ago
It looks like he is opening these images from a website ... is anyone able to get this website so i can take a better look at these images please !?
godzy0 3 years ago
very helpful !
keep up the good work.
ananalosh 3 years ago
I think you are right. It's dentin, predentin and odontoblasts, and the light connective tissue is the pulp.
lindsaydietrich 3 years ago
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
ibrowz99 4 years ago
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
ibrowz99 4 years ago
actually in the last picture, the descriptor is unfourtunatly a bit wrong I think. What we see in pink, is the dentin, with tubules clearly seen. The lighter pink area is the predentin, which is attached to the Odontoblasts (the cells in the white lumen, closest to the light-pink area). The White central lumen is the Dental Pullp with fibroblasts, nerves and bloodvessels etc. So itäs NOT enamel in pink, its Dentin. Please correct me if im wrong
ibrowz99 4 years ago
great tool for education
cercibb 4 years ago