Polifiodon: Perbedaan antara revisi

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'''Polifiodon''' (polyphyodont, {{IPAc-en|ˌ|p|ä|l|i-|ˈ|f|ī|ə|ˌ|d|ä|n|t}}) adalah hewan yang [[gigi]]<nowiki/>nya berganti secara terus-menerus . Sebaliknya, difiodon mempunyai karakteristik berganti gigi hanya dua kali.<ref name="Buchtova">{{Cite journal|last=Buchtova|first=M.|author2=Stembirek, J.|author3=Glocova, K.|author4=Matalova, E.|author5=Tucker, A. S.|title=Early Regression of the Dental Lamina Underlies the Development of Diphyodont Dentitions|journal=Journal of Dental Research|year=2012|volume=91|issue=5|pages=491–498|doi=10.1177/0022034512442896}}</ref>
 
Termasuk Polifoidon adalah banyak ikan yang bergigi, banyak [[reptil]] seperti buaya, tokek,<ref>{{Cite web |url=http://www.devbio.biology.gatech.edu/?page_id=3229 |title=Mechanism of tooth replacement in Leopard geckos |access-date=2016-05-14 |archive-date=2015-03-12 |archive-url=https://web.archive.org/web/20150312094002/http://www.devbio.biology.gatech.edu/?page_id=3229 |dead-url=yes }}</ref><ref name="FUENZALIDA2000">{{Cite journal|last=Fuenzalida|first=Marcela|author2=Lemus, Susi|author3=Illanes, Julio|author4=Montiel, Enrique|author5=Acuña, Olga|author6=Lemus, David|title=Histochemical detection of sugar residues in lizard teeth (''Liolaemus gravenhorsti''): a lectin-binding study|journal=Biological Research|year=2000|volume=33|issue=3-4|doi=10.4067/S0716-97602000000300008|url=http://www.scielo.cl/scielo.php?pid=S0716-97602000000300008&script=sci_arttext}}</ref><ref name="Gaete2013">{{Cite journal|last=Gaete|first=Marcia|author2=Tucker, Abigail S.|author3=Schubert, Michael|title=Organized Emergence of Multiple-Generations of Teeth in Snakes Is Dysregulated by Activation of Wnt/Beta-Catenin Signalling|journal=PLoS ONE|year=2013|volume=8|issue=9|pages=e74484|doi=10.1371/journal.pone.0074484|url=http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0074484}}</ref> dan banyak [[vertebrata]] lain, kecuali mamalia. Gigi permanen yang baru tumbuh di rahang, biasanya di bawah atau tepat di belakang gigi yang ada, dari [[Sel punca|sel-sel induk]] di dental lamina.<ref name="Whitlock">{{Cite journal|last=Whitlock|first=John A|author2=Richman, Joy M|title=Biology of tooth replacement in amniotes|journal=International Journal of Oral Science|year=2013|volume=5|issue=2|pages=66–70|doi=10.1038/ijos.2013.36|url=http://www.nature.com/ijos/journal/v5/n2/full/ijos201336a.html}}</ref> Hewan muda biasanya memiliki gigi lengkap saat mereka menetas; tidak ada perubahan gigi dalam telur. Dalam beberapa hari, penggantian gigi dimulai, biasanya di bagian belakang rahang ke arah depan seperti gelombang. Rata-rata setiap gigi berganti setiap beberapa bulan.
 
[[Crocodilia]] adalah satu-satunya vertebrata non mamalia dengan tudung gigi.<ref name="LeBlanc">{{Cite journal|last=LeBlanc|first=Aaron R. H.|author2=Reisz, Robert R.|author3=Viriot, Laurent|title=Periodontal Ligament, Cementum, and Alveolar Bone in the Oldest Herbivorous Tetrapods, and Their Evolutionary Significance|journal=PLoS ONE|year=2013|volume=8|issue=9|pages=e74697|doi=10.1371/journal.pone.0074697|url=http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0074697}}</ref> Gigi [[Alligator|pengganti]] pada buaya berupa gigi pengganti kecil di bawah gigi yang ada sekali dalam satu tahun dan setiap gigi berganti sampai 50 kali dalam siklus hidup buaya.<ref>{{Cite journal|author=Wu, Ping; Wu, Xiaoshan; Jiang, Ting-Xin; Elsey, Ruth M.; Temple, Bradley L.; Divers, Stephen J.; Glenn, Travis C.; Yuan, Kuo; Chen, Min-Huey; Widelitz, Randall B.; Chuon, Cheng-Ming|year=2013|title=Specialized stem cell niche enables repetitive renewal of alligator teeth|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=110|issue=22|pages=E2009–E2018|doi=10.1073/pnas.1213202110|url=http://www.pnas.org/content/110/22/E2009.full.pdf+html?with-ds=yes|pmid=23671090|pmc=3670376}}</ref> Crocodilia digunakan untuk penelitian [[Regenerasi (biologi)|regenerasi]] gigi pada manusia.<ref name="pmid23671090">{{Cite journal|vauthors=Wu P, Wu X, Jiang TX, Elsey RM, Temple BL, Divers SJ, etal|title=Specialized stem cell niche enables repetitive renewal of alligator teeth.|journal=Proc Natl Acad Sci U S A|year=2013|volume=110|issue=22|pages=E2009-18|pmid=23671090|doi=10.1073/pnas.1213202110|pmc=3670376|url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23671090}}</ref>
 
== Evolusi mamalia ==