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This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Dizzle32.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 11:30, 17 January 2022 (UTC)
incisors, canines, pre-molars, molars, which are "cheek teeth" anatomy of tooth, gums, circulatory system and nervous system in mouth/teeth tooth/mouth conditions and problems — Preceding unsigned comment added by 152.3.68.15 ( talk) 01:07, 27 September 2012 (UTC)
Birds can have teeth too...-- 72.197.35.238 ( talk) 19:04, 13 June 2011 (UTC)
Teeth have emaeml the hardest subtance in the body — Preceding unsigned comment added by 76.119.39.142 ( talk) 01:33, 9 February 2012 (UTC)
Tooth (plural teeth) are small, calcified, whitish structures found in the jaws Clearly this should be changed to "A tooth is a small, calcified, whitish structure. . . " because, it's you know, singular.
I know that.
“Early fish such as the thelodonts had teeth for scales, suggesting that the origin of teeth was scales which were retained in the mouth.” - scales for teeth perhaps? Anihl ( talk) 01:47, 27 February 2013 (UTC)
This seems inaccurate, despite it supposedly being sourced from a 1992 book. The pH level of sugar is neutral, but isn't it more accurate to state that dental cavities are a result of sugars instead of low, neutral or high pH level? 71.112.173.40 ( talk) 14:15, 24 March 2014 (UTC)
Unfortunately this article is protected, but here is an interesting article on the evolutionary history of teeth:
http://news.sciencemag.org/evolution/2015/06/ancient-fish-sheds-light-how-teeth-evolved
Summary: as has long been suspected, teeth are, at least in the case of the 400-million-year-old fish Romundina stellina and in all likelihood generally, specialised scales.
Note that the linked article doesn't mention scales explicitly, but the teeth of Romundina stellina are scale-like in structure and Philip Donoghue has said elsewhere that ‘the earliest teeth were like our own - but also structured like body scales in primitive fishes. This supports the view that teeth evolved from scales, which arose much earlier in vertebrate evolution.’ — Preceding unsigned comment added by 82.139.82.82 ( talk) 22:51, 24 June 2015 (UTC)
Considering in many animals from octopuses to hippos to saber-toothed cats and countless other, individual teeth can be very large in relation to any other organ even, it's not really appropriate to describe teeth in general as small in my opinion. — Preceding unsigned comment added by 2A02:908:183:38C0:8591:B320:52B4:D00B ( talk) 22:30, 28 November 2016 (UTC)
Through the course of our rat specimen dissection, we could potentially elaborate on the vasculature and other gross anatomical elements of rodent teeth, as compared to human dental anatomy. Shawnbrookins ( talk) 05:04, 8 March 2017 (UTC)
I've added the term hypselodont to the rodent section and added a new citation. I've also edited and added sentences in the rodent incisor section. I plan on adding my own images of the rodent upper and lower incisors in the future once I have properly labeled them. Dizzle32 ( talk) 04:26, 19 April 2017 (UTC)
Added another sentence about the production of enamel and dentin, along with a citation. Dizzle32 ( talk) 02:29, 3 May 2017 (UTC)
Added more images of the top incisors from the Rattus rattus specimen. Also rearranged the images of the rodent incisors to fit within the Rodent section only. Dizzle32 ( talk) 05:29, 11 May 2017 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Please add the following cleanup template and links to the first paragraph of the "Origin" section:
Before:
Teeth are assumed to have evolved either from ectoderm denticles that folded and integrated into the mouth (outside–in theory), or from endoderm pharyngeal teeth (primarily formed in the pharynx of jawless vertebrates) (inside–out theory). In addition, there is another theory stating that neural crest gene regulatory network, and neural crest-derived ectomesenchyme are the key to generate teeth (with any epithelium either ectoderm or endoderm).
After:
{{Technical|section|date=August 2021}} Teeth are assumed to have evolved either from [[ectoderm]] [[Denticle (tooth feature)|denticles]] that folded and integrated into the mouth (outside–in theory), or from [[endoderm]] [[Pharynx|pharyngeal]] teeth (primarily formed in the [[pharynx]] of [[jawless vertebrates]]) (inside–out theory). In addition, there is another theory stating that [[neural crest]] [[gene regulatory network]], and neural crest-derived [[ectomesenchyme]] are the key to generate teeth (with any [[epithelium]], either ectoderm or endoderm).
157.157.113.254 ( talk) 15:53, 20 August 2021 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Please change the "Origin" section to:
The evolutionary origins of teeth aren't clear, and the question is highly debated. [1] The two main hypotheses are: [1]
- That teeth originate from scales (of the same sort as sharks currently have, known as dermal denticles or placoid scales). This theory is mainly supported by circumstantial evidence, for example teeth and shark scales having a very similar structure, and evidence since the late 20th century has challenged this theory. [1] This is known as the "outside–in" theory. [1]
- That teeth developed independently. This is known as the "inside–out" theory. [1] Evidence included teeth and scales coming from different germ layers (with teeth requiring endoderm), but that was later shown not to necessarily be the case. There is also much evidence against this theory. [1]
The genes governing tooth development in mammals are homologous to those involved in the development of fish scales. [2] Fossil studies of the extinct fish Romundina stellina showed that the teeth and scales were made of the same tissues. [3]
References
- ^ a b c d e f g Donoghue, Philip C. J.; Rücklin, Martin (2016). "The ins and outs of the evolutionary origin of teeth". Evolution & Development. 18 (1): 19–30. doi: 10.1111/ede.12099. ISSN 1525-142X.
- ^ Sharpe, P. T. (2001). "Fish scale development: Hair today, teeth and scales yesterday?". Current Biology. 11 (18): R751–R752. doi: 10.1016/S0960-9822(01)00438-9. PMID 11566120. S2CID 18868124.
- ^ Jennifer Viegas (June 24, 2015). "First-known teeth belonged to fierce fish". ABC Science. Retrieved June 28, 2015.
The reason is that the section is incomprehensible due to its overuse of jargon. The proposed edit gives a understandable explanation.
157.157.113.121 ( talk) 19:03, 20 August 2021 (UTC)
shouldn't the PIE word begin with h₃? I am a Green Bee ( talk) 14:15, 19 August 2022 (UTC)
I feel like the lead image isn't the most appropriate for the article, as teeth are only a part of the image. Most of the image is just a chimp face, which, although, a good picture, doesn't have too much to do with teeth.
I propose the lead image should be changed to Lower wisdom tooth.jpg (wikimedia.org) or Human tooth diagram-en.svg (wikimedia.org). 216.207.176.186 ( talk) 23:25, 9 March 2023 (UTC)
This
level-5 vital article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||||||||||||||
|
This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Dizzle32.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 11:30, 17 January 2022 (UTC)
incisors, canines, pre-molars, molars, which are "cheek teeth" anatomy of tooth, gums, circulatory system and nervous system in mouth/teeth tooth/mouth conditions and problems — Preceding unsigned comment added by 152.3.68.15 ( talk) 01:07, 27 September 2012 (UTC)
Birds can have teeth too...-- 72.197.35.238 ( talk) 19:04, 13 June 2011 (UTC)
Teeth have emaeml the hardest subtance in the body — Preceding unsigned comment added by 76.119.39.142 ( talk) 01:33, 9 February 2012 (UTC)
Tooth (plural teeth) are small, calcified, whitish structures found in the jaws Clearly this should be changed to "A tooth is a small, calcified, whitish structure. . . " because, it's you know, singular.
I know that.
“Early fish such as the thelodonts had teeth for scales, suggesting that the origin of teeth was scales which were retained in the mouth.” - scales for teeth perhaps? Anihl ( talk) 01:47, 27 February 2013 (UTC)
This seems inaccurate, despite it supposedly being sourced from a 1992 book. The pH level of sugar is neutral, but isn't it more accurate to state that dental cavities are a result of sugars instead of low, neutral or high pH level? 71.112.173.40 ( talk) 14:15, 24 March 2014 (UTC)
Unfortunately this article is protected, but here is an interesting article on the evolutionary history of teeth:
http://news.sciencemag.org/evolution/2015/06/ancient-fish-sheds-light-how-teeth-evolved
Summary: as has long been suspected, teeth are, at least in the case of the 400-million-year-old fish Romundina stellina and in all likelihood generally, specialised scales.
Note that the linked article doesn't mention scales explicitly, but the teeth of Romundina stellina are scale-like in structure and Philip Donoghue has said elsewhere that ‘the earliest teeth were like our own - but also structured like body scales in primitive fishes. This supports the view that teeth evolved from scales, which arose much earlier in vertebrate evolution.’ — Preceding unsigned comment added by 82.139.82.82 ( talk) 22:51, 24 June 2015 (UTC)
Considering in many animals from octopuses to hippos to saber-toothed cats and countless other, individual teeth can be very large in relation to any other organ even, it's not really appropriate to describe teeth in general as small in my opinion. — Preceding unsigned comment added by 2A02:908:183:38C0:8591:B320:52B4:D00B ( talk) 22:30, 28 November 2016 (UTC)
Through the course of our rat specimen dissection, we could potentially elaborate on the vasculature and other gross anatomical elements of rodent teeth, as compared to human dental anatomy. Shawnbrookins ( talk) 05:04, 8 March 2017 (UTC)
I've added the term hypselodont to the rodent section and added a new citation. I've also edited and added sentences in the rodent incisor section. I plan on adding my own images of the rodent upper and lower incisors in the future once I have properly labeled them. Dizzle32 ( talk) 04:26, 19 April 2017 (UTC)
Added another sentence about the production of enamel and dentin, along with a citation. Dizzle32 ( talk) 02:29, 3 May 2017 (UTC)
Added more images of the top incisors from the Rattus rattus specimen. Also rearranged the images of the rodent incisors to fit within the Rodent section only. Dizzle32 ( talk) 05:29, 11 May 2017 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Please add the following cleanup template and links to the first paragraph of the "Origin" section:
Before:
Teeth are assumed to have evolved either from ectoderm denticles that folded and integrated into the mouth (outside–in theory), or from endoderm pharyngeal teeth (primarily formed in the pharynx of jawless vertebrates) (inside–out theory). In addition, there is another theory stating that neural crest gene regulatory network, and neural crest-derived ectomesenchyme are the key to generate teeth (with any epithelium either ectoderm or endoderm).
After:
{{Technical|section|date=August 2021}} Teeth are assumed to have evolved either from [[ectoderm]] [[Denticle (tooth feature)|denticles]] that folded and integrated into the mouth (outside–in theory), or from [[endoderm]] [[Pharynx|pharyngeal]] teeth (primarily formed in the [[pharynx]] of [[jawless vertebrates]]) (inside–out theory). In addition, there is another theory stating that [[neural crest]] [[gene regulatory network]], and neural crest-derived [[ectomesenchyme]] are the key to generate teeth (with any [[epithelium]], either ectoderm or endoderm).
157.157.113.254 ( talk) 15:53, 20 August 2021 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Please change the "Origin" section to:
The evolutionary origins of teeth aren't clear, and the question is highly debated. [1] The two main hypotheses are: [1]
- That teeth originate from scales (of the same sort as sharks currently have, known as dermal denticles or placoid scales). This theory is mainly supported by circumstantial evidence, for example teeth and shark scales having a very similar structure, and evidence since the late 20th century has challenged this theory. [1] This is known as the "outside–in" theory. [1]
- That teeth developed independently. This is known as the "inside–out" theory. [1] Evidence included teeth and scales coming from different germ layers (with teeth requiring endoderm), but that was later shown not to necessarily be the case. There is also much evidence against this theory. [1]
The genes governing tooth development in mammals are homologous to those involved in the development of fish scales. [2] Fossil studies of the extinct fish Romundina stellina showed that the teeth and scales were made of the same tissues. [3]
References
- ^ a b c d e f g Donoghue, Philip C. J.; Rücklin, Martin (2016). "The ins and outs of the evolutionary origin of teeth". Evolution & Development. 18 (1): 19–30. doi: 10.1111/ede.12099. ISSN 1525-142X.
- ^ Sharpe, P. T. (2001). "Fish scale development: Hair today, teeth and scales yesterday?". Current Biology. 11 (18): R751–R752. doi: 10.1016/S0960-9822(01)00438-9. PMID 11566120. S2CID 18868124.
- ^ Jennifer Viegas (June 24, 2015). "First-known teeth belonged to fierce fish". ABC Science. Retrieved June 28, 2015.
The reason is that the section is incomprehensible due to its overuse of jargon. The proposed edit gives a understandable explanation.
157.157.113.121 ( talk) 19:03, 20 August 2021 (UTC)
shouldn't the PIE word begin with h₃? I am a Green Bee ( talk) 14:15, 19 August 2022 (UTC)
I feel like the lead image isn't the most appropriate for the article, as teeth are only a part of the image. Most of the image is just a chimp face, which, although, a good picture, doesn't have too much to do with teeth.
I propose the lead image should be changed to Lower wisdom tooth.jpg (wikimedia.org) or Human tooth diagram-en.svg (wikimedia.org). 216.207.176.186 ( talk) 23:25, 9 March 2023 (UTC)