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https://www.readbyqxmd.com/read/28317348/-expression-and-significance-of-wingless-type-mmtv-integration-site-family-member-5a-receptor-tyrosine-kinase-like-orphan-receptor-2-in-the-rat-dental-follicle
#1
Wang Liping, Li Boqi, Wang Qi, Tie Xiaomin, Liu Yishan
OBJECTIVE: To observe the expression of wingless-type MMTV integration site family, member 5A (Wnt5A)/receptor tyrosine kinase-like orphan receptor 2 (Ror2) signal in the dental follicle cells during the normal eruption of the teeth as well as to explore the relationship between the expression of dental follicle cells and the formation of mature osteoclasts and eruption of the teeth. METHODS: The mandibulars of 1-13 d old SD rats were separated to observe the growth and develop-ment of the teeth and alveolar bone through hematoxylin-eosin(HE) staining...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28316917/a-comparative-study-of-syndecan-1-expression-in-different-odontogenic-tumors
#2
Shahroo Etemad-Moghadam, Mojgan Alaeddini
BACKGROUND: Expression of various cellular/molecular factors change during the course of tumor formation from odontogenic tissues of the tooth germ. Evaluation of these factors can help provide a better perception of the tumorigenesis and biologic behavior of odontogenic tumors (OTs). Syndecan-1 is a heparan sulfate proteoglycan which has not been extensively investigated in these lesions. The objective of the present study was to assess the immunohistochemical expression of CD138 in adenomatoid odontogenic tumor (AOT), ameloblastic fibroma (AF) and odontogenic myxoma (OM) and to compare it with ameloblastoma and keratocystic odontogenic tumor (KCOT)...
January 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28300208/practical-whole-tooth-restoration-utilizing-autologous-bioengineered-tooth-germ-transplantation-in-a-postnatal-canine-model
#3
Mitsuaki Ono, Masamitsu Oshima, Miho Ogawa, Wataru Sonoyama, Emilio Satoshi Hara, Yasutaka Oida, Shigehiko Shinkawa, Ryu Nakajima, Atsushi Mine, Satoru Hayano, Satoshi Fukumoto, Shohei Kasugai, Akira Yamaguchi, Takashi Tsuji, Takuo Kuboki
Whole-organ regeneration has great potential for the replacement of dysfunctional organs through the reconstruction of a fully functional bioengineered organ using three-dimensional cell manipulation in vitro. Recently, many basic studies of whole-tooth replacement using three-dimensional cell manipulation have been conducted in a mouse model. Further evidence of the practical application to human medicine is required to demonstrate tooth restoration by reconstructing bioengineered tooth germ using a postnatal large-animal model...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282516/f-spondin-negatively-regulates-dental-follicle-differentiation-through-the-inhibition-of-tgf-%C3%AE-activity
#4
Ai Orimoto, Misaki Kurokawa, Keisuke Handa, Masaki Ishikawa, Eisaku Nishida, Makoto Aino, Akio Mitani, Miho Ogawa, Takashi Tsuji, Masahiro Saito
OBJECTIVE: F-spondin is an extracellular matrix (ECM) protein that belongs to the thrombospondin type I repeat superfamily and is a negative regulator of bone mass. We have previously shown that f-spondin is specifically expressed in the dental follicle (DF), which gives rise to the periodontal ligament (PDL) during the tooth root formation stage. To investigate the molecular mechanism of PDL formation, we investigated the function of f-spondin in DF differentiation. DESIGN: The expression patterning of f-spondin in the developing tooth germ was compared with that of periodontal ligament-related genes, including runx2, type I collagen and periostin, by in situ hybridization analysis...
March 1, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28279686/navigation-guided-extraction-of-impacted-supernumerary-teeth-a-case-report
#5
Jing Wang, Nianhui Cui, Yujiao Guo, Wei Zhang
Supernumerary teeth usually result in retarded eruption, malocclusion, poor esthetics, and cyst formation. Management involves surgical extraction, which can be challenging in certain complicated cases owing to the risk of injury to young permanent tooth germs or fragile roots. The present report describes a novel preoperative computer-assisted and intraoperative navigation-guided surgical treatment for a case of complicated impacted supernumerary teeth. The report highlights accurate tooth location and minimal invasion with use of the navigation-guided system...
February 14, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28261273/capacity-of-human-dental-follicle-cells-to-differentiate-into-neural-cells-in-vitro
#6
Shingo Kanao, Naomi Ogura, Kosuke Takahashi, Ko Ito, Masaaki Suemitsu, Kayo Kuyama, Toshirou Kondoh
The dental follicle is an ectomesenchymal tissue surrounding the developing tooth germ. Human dental follicle cells (hDFCs) have the capacity to commit to differentiation into multiple cell types. Here we investigated the capacity of hDFCs to differentiate into neural cells and the efficiency of a two-step strategy involving floating neurosphere-like bodies for neural differentiation. Undifferentiated hDFCs showed a spindle-like morphology and were positive for neural markers such as nestin, β-III-tubulin, and S100β...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28241059/exceptionally-prolonged-tooth-formation-in-elasmosaurid-plesiosaurians
#7
Benjamin P Kear, Dennis Larsson, Johan Lindgren, Martin Kundrát
Elasmosaurid plesiosaurians were globally prolific marine reptiles that dominated the Mesozoic seas for over 70 million years. Their iconic body-plan incorporated an exceedingly long neck and small skull equipped with prominent intermeshing 'fangs'. How this bizarre dental apparatus was employed in feeding is uncertain, but fossilized gut contents indicate a diverse diet of small pelagic vertebrates, cephalopods and epifaunal benthos. Here we report the first plesiosaurian tooth formation rates as a mechanism for servicing the functional dentition...
2017: PloS One
https://www.readbyqxmd.com/read/28222099/morphological-study-of-tooth-development-in-podoplanin-deficient-mice
#8
Kenyo Takara, Naoki Maruo, Kyoko Oka, Chiaki Kaji, Yuji Hatakeyama, Naruhiko Sawa, Yukinari Kato, Junro Yamashita, Hiroshi Kojima, Yoshihiko Sawa
Podoplanin is a mucin-type highly O-glycosylated glycoprotein identified in several somatyic cells: podocytes, alveolar epithelial cells, lymphatic endothelial cells, lymph node stromal fibroblastic reticular cells, osteocytes, odontoblasts, mesothelial cells, glia cells, and others. It has been reported that podoplanin-RhoA interaction induces cytoskeleton relaxation and cell process stretching in fibroblastic cells and osteocytes, and that podoplanin plays a critical role in type I alveolar cell differentiation...
2017: PloS One
https://www.readbyqxmd.com/read/28203310/analysis-of-dental-maturation-in-relation-to-sagittal-jaw-relationships
#9
Magdalena Durka-Zając, Marcin Derwich, Maria Mituś-Kenig, Magdalena Łoboda, Elżbieta Pawłowska
BACKGROUND: The degree of mineralization of permanent tooth germs in dental age assessment has been an area of interest among many authors for years. However, only recently have researchers attempted to determine the potential interdependencies between dental age and jaw relationships. The aim of this work was to compare dental maturation in patients with skeletal Class II to patients with skeletal Classes I and III. MATERIAL/METHODS: The study involved 150 patients who sought orthodontic treatment...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28095448/distribution-of-cathepsin-k-in-late-stage-of-tooth-germ-development-and-its-function-in-degrading-enamel-matrix-proteins-in-mouse
#10
Tao Jiang, Fen Liu, Wei-Guang Wang, Xin Jiang, Xuan Wen, Kai-Jin Hu, Yang Xue
Cathepsin K (CTSK) is a member of cysteine proteinase family, and is predominantly expressed in osteoclastsfor degradationof bone matrix proteins. Given the similarity in physical properties of bone and dental mineralized tissues, including enamel, dentin and cementum, CTSK is likely to take part in mineralization process during odontogenesis. On the other hand, patients with pycnodysostosis caused by mutations of the CTSK gene displayedmultipledental abnormalities, such as hypoplasia of the enamel, obliterated pulp chambers, hypercementosis and periodontal disease...
2017: PloS One
https://www.readbyqxmd.com/read/28070906/evolutionary-aspects-of-the-development-of-teeth-and-baleen-in-the-bowhead-whale
#11
J G M Thewissen, Tobin L Hieronymus, John C George, Robert Suydam, Raphaela Stimmelmayr, Denise McBurney
In utero, baleen whales initiate the development of several dozens of teeth in upper and lower jaws. These tooth germs reach the bell stage and are sometimes mineralized, but toward the end of prenatal life they are resorbed and no trace remains after birth. Around the time that the germs disappear, the keratinous baleen plates start to form in the upper jaw, and these form the food-collecting mechanism. Baleen whale ancestors had two generations of teeth and never developed baleen, and the prenatal teeth of modern fetuses are usually interpreted as an evolutionary leftover...
April 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28064220/gene-expression-analysis-of-cultured-rat-endothelial-cells-after-nd-yag-laser-irradiation-by-affymetrix-genechip-array
#12
Yoshiko Masuda, Satoshi Yokose, Hiroshi Sakagami
Endothelial cells and dental pulp cells enhance osteo-/odontogenic and angiogenic differentiation. In our previous study, rat pulp cells migrated to Nd:YAG laser-irradiated endothelial cells in an insert cell culture system. The purpose of this study was to examine the possible changes in the gene expression of cultured rat aortic endothelial cells after Nd:YAG laser irradiation using affymetrix GeneChip Array. Total RNA was extracted from the cells at 5 h after laser irradiation. Gene expressions were evaluated by DNA array chip...
January 2017: In Vivo
https://www.readbyqxmd.com/read/28053317/jawbone-microenvironment-promotes-periodontium-regeneration-by-regulating-the-function-of-periodontal-ligament-stem-cells
#13
Bin Zhu, Wenjia Liu, Yihan Liu, Xicong Zhao, Hao Zhang, Zhuojing Luo, Yan Jin
During tooth development, the jawbone interacts with dental germ and provides the development microenvironment. Jawbone-derived mesenchymal stem cells (JBMSCs) maintain this microenvironment for root and periodontium development. However, the effect of the jawbone microenvironment on periodontium tissue regeneration is largely elusive. Our previous study showed that cell aggregates (CAs) of bone marrow mesenchymal stem cells promoted periodontium regeneration on the treated dentin scaffold. Here, we found that JBMSCs enhanced not only the osteogenic differentiation of periodontal ligament stem cells (PDLSCs) but also their adhesion to titanium (Ti) material surface...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28030993/circadian-rhythms-and-gene-expression-during-mouse-molar-tooth-development
#14
Minou Nirvani, Cuong Khuu, Tor Paaske Utheim, Henriette Stavik Hollingen, Simon Furre Amundsen, Lars Peter Sand, Amer Sehic
OBJECTIVES: Incremental markings in dental enamel suggest that the circadian clock may influence the molecular underpinnings orchestrating enamel formation. The aim of this study was to investigate whether the genes and microRNAs (miRNAs) oscillate in a circadian pattern during tooth and enamel development. MATERIAL AND METHODS: Comparative gene and miRNA expression profiling of the first mandibular molar tooth germ isolated at different time-points during the light and night period was performed using microarrays and validated using real-time RT-PCR...
March 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28012573/fgf2-fgf3-and-fgf4-expression-pattern-during-molars-odontogenesis-in-didelphis-albiventris
#15
Íria Gabriela Dias Dos Santos, Erika Cristina Jorge, Aline Gonçalves Lio Copola, Bruno Machado Bertassoli, Alfredo Miranda de Goes, Gerluza Aparecida Borges Silva
Odontogenesis is guided by a complex signaling cascade in which several molecules, including FGF2-4, ensure all dental groups development and specificity. Most of the data on odontogenesis derives from rodents, which does not have all dental groups. Didelphis albiventris is an opossum with the closest dentition to humans, and the main odontogenesis stages occur when the newborns are in the pouch. In this study, D. albiventris postnatals were used to characterize the main stages of their molars development; and also to establish FGF2, FGF3 and FGF4 expression pattern...
March 2017: Acta Histochemica
https://www.readbyqxmd.com/read/27982023/spatial-signalling-mediated-by-the-transforming-growth-factor-%C3%AE-signalling-pathway-during-tooth-formation
#16
Xin-Yu He, Ke Sun, Ruo-Shi Xu, Jia-Li Tan, Cai-Xia Pi, Mian Wan, Yi-Ran Peng, Ling Ye, Li-Wei Zheng, Xue-Dong Zhou
Tooth development relies on sequential and reciprocal interactions between the epithelial and mesenchymal tissues, and it is continuously regulated by a variety of conserved and specific temporal-spatial signalling pathways. It is well known that suspensions of tooth germ cells can form tooth-like structures after losing the positional information provided by the epithelial and mesenchymal tissues. However, the particular stage in which the tooth germ cells start to form tooth-like structures after losing their positional information remains unclear...
December 16, 2016: International Journal of Oral Science
https://www.readbyqxmd.com/read/27981756/maternal-diabetes-modulates-offspring-cell-proliferation-and-apoptosis-during-odontogenesis-via-the-tlr4-nf-%C3%AE%C2%BAb-signalling-pathway
#17
Guoqing Chen, Wenhua Sun, Yan Liang, Tian Chen, Weihua Guo, Weidong Tian
OBJECTIVES: Maternal gestational diabetes leads to an adverse in utero environment and increases the risk of malformations during embryo organogenesis. In the present study, we analysed the effects of maternal diabetes on tooth germ cell proliferation and apoptosis in offspring, and investigated their underlying mechanisms. MATERIALS AND METHODS: A rat model of maternal diabetes was induced by intraperitoneal injection of streptozotocin and the pregnant rats were divided into three groups: controls, the diabetic group and diabetic group with insulin treatment...
December 16, 2016: Cell Proliferation
https://www.readbyqxmd.com/read/27916472/generation-of-neural-cells-using-ipscs-from-sleep-bruxism-patients-with-5-ht2a-polymorphism
#18
Yurie Hoashi, Satoshi Okamoto, Yuka Abe, Takashi Matsumoto, Junichi Tanaka, Yuya Yoshida, Kent Imaizumi, Kenji Mishima, Wado Akamatsu, Hideyuki Okano, Kazuyoshi Baba
PURPOSE: Sleep bruxism (SB) is classified as a sleep-related movement disorder characterized by grinding and clenching of the teeth during sleep, which is responsible for a variety of clinical problems such as abnormal tooth attrition and fracture of teeth or roots. Little is known about the etiology of SB. Our previous study identified a genomic association of the serotonin 2A receptor (5-HT2A) single nucleotide polymorphism (SNP), rs6313 C>T, with SB, where the C allele carrier is associated with a 4...
December 1, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27914227/removal-of-supernumerary-teeth-utilizing-a-computer-aided-design-computer-aided-manufacturing-surgical-guide
#19
Chanwoo Jo, Doohwan Bae, Byungho Choi, Jihun Kim
Supernumerary teeth need to be removed because they can cause various complications. Caution is needed because their removal can cause damage to permanent teeth or tooth germs in the local vicinity. Surgical guides have recently been used in maxillofacial surgery. Because surgical guides are designed through preoperative analysis by computer-aided design software and fabricated using a 3-dimensional printer applying computer-aided manufacturing technology, they increase the accuracy and predictability of surgery...
November 12, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27895346/association-between-hypodontia-and-angles-malocclusion
#20
Batool Ali, Syed Sheeraz Hussain
This study was planned to determine the prevalence of hypodontia in permanent dentition and to test whether an association was present between hypodontia and Angle's malocclusion. The retrospective study was conducted at a tertiary care hospital, Karachi, and comprised record of all patients visiting the orthodontic clinics of the hospital from 2005 to 2015. Orthodontic records of 790(79%) subjects, including 189(23.9%) males and 601(76.1%) females, were reviewed. Their mean age was 17 ± 5.06 years. A tooth was considered missing if no evidence of tooth germ was observed on orthopantomograms and dental casts...
October 2016: JPMA. the Journal of the Pakistan Medical Association
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