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https://www.readbyqxmd.com/read/28626923/comparative-performance-of-deciduous-and-permanent-dental-morphology-in-detecting-biological-relatives
#1
Kathleen S Paul, Christopher M Stojanowski
OBJECTIVES: Dental morphology plays a key role in reconstructing population history and evolutionary relationships at global, regional, and intracemetery scales. At the inter-individual level, it is assumed that close biological kin exhibit greater phenotypic similarity than non-relatives. Heritability estimates provide one measure of phenotypic resemblance but are not easily incorporated into analyses of archaeological samples. In this study we evaluate the assumption that relatives are more similar phenotypically than non-relatives...
June 19, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28621563/reduced-mastication-impairs-memory-function
#2
Y Fukushima-Nakayama, Takehito Ono, M Hayashi, M Inoue, H Wake, Takashi Ono, T Nakashima
Mastication is an indispensable oral function related to physical, mental, and social health throughout life. The elderly tend to have a masticatory dysfunction due to tooth loss and fragility in the masticatory muscles with aging, potentially resulting in impaired cognitive function. Masticatory stimulation has influence on the development of the central nervous system (CNS) as well as the growth of maxillofacial tissue in children. Although the relationship between mastication and cognitive function is potentially important in the growth period, the cellular and molecular mechanisms have not been sufficiently elucidated...
May 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28615078/characterisation-of-roseomonas-mucosa-isolated-from-the-root-canal-of-an-infected-tooth
#3
Nina Diesendorf, Stefanie Köhler, Walter Geißdörfer, Tanja Grobecker-Karl, Matthias Karl, Andreas Burkovski
OBJECTIVE: The genus Roseomonas comprises a group of pink-pigmented, slow-growing, aerobic, non-fermentative Gram-negative bacteria, which have been isolated from environmental sources such as water and soil, but are also associated with human infections. In the study presented here, Roseomonas mucosa was identified for the first time as part of the endodontic microbiota of an infected root canal and characterised in respect to growth, antibiotic susceptibility and biofilm formation. RESULTS: The isolated R...
June 14, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28613059/-experimental-study-of-transforming-growth-factor-%C3%AE-3-combined-with-dental-pulp-stem-cells-in-promoting-the-implant-s-osseointegration
#4
T Wang, Huojia Muhetaer, J Li
Objective: To investigate the effect of transforming growth factor-β3 (TGF-β3) and dental pulp stem cells (DPSC) in promoting the implant's osteointegration. Methods: Thirty-three New Zealand white rabbits were randomly divided into phosphate buffer saline (PBS) group, DPSC group and TGF-β3 + DPSC group (12 rabbits/group). Two teeth from the rabbits's mandibular incisors or molars were pulled out randomly, then implant were placed in the tooth extraction site immediately. In PBS group, the implant area was filled with Bio-Oss powder 0...
June 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28611324/comparative-evaluation-of-mangifera-indica-leaf-mouthwash-with-chlorhexidine-on-plaque-accumulation-gingival-inflammation-and-salivary-streptococcal-growth
#5
Sham S Bhat, K Sundeep Hegde, Chinchu Mathew, S Vidya Bhat, M Shyamjith
AIMS: This study aims to compare the efficacy of a mango (Mangifera indica) leaf mouthwash with chlorhexidine on plaque status, gingival status, and salivary Streptococcus mutans count. MATERIALS AND METHODS: A sample of twenty children, aged 8-14 years, Mangalore Residential School, Karnataka, India, was allocated into two groups. Group A (10) and Group B (10) were given test mouthwash "mango leaf mouthwash" and chlorhexidine, respectively. The clinical trial was carried out for ½ h after rinsing and after 5 days, during which children were asked to rinse once daily, with 10 ml of the given mouthwash ½ h after tooth brushing...
March 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28606113/magnetic-resonance-imaging-and-computed-tomography-as-tools-for-the-investigation-of-sperm-whale-physeter-macrocephalus-teeth-and-eye
#6
Aage Kristian Olsen Alstrup, Ole Lajord Munk, Trine Hammer Jensen, Lasse Fast Jensen, Abdi Hedayat, Brian Hansen
BACKGROUND: Scanning techniques such as magnetic resonance imaging (MRI) and computed tomography (CT) are useful tools in veterinary and human medicine. Here we demonstrate the usefulness of these techniques in the study of the anatomy of wild marine mammals as part of a necropsy. MRI and CT scans of sperm whale teeth (n = 4) were performed. The methods were compared and further compared to current standard methods for evaluation of tooth layering. For MRI a zero echo time sequence was used, as previously done for imaging of intact human teeth...
June 12, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/28597838/-collaboration-between-periodontics-and-orthodontics-interest-of-alveolar-corticotomies-and-piezocision-review-of-literature
#7
Brenda Mertens, Charles Angioni, Valérie Orti, Pierre Canal
INTRODUCTION: Orthodontics in adults must adapt to certain particularities especially related to the decrease or absence of growth and the prevalence of periodontal damage in this population. This review of the literature aims to assess the effects of alveolar corticotomies on accelerating or facilitating tooth movements in different types of orthodontic movements, to compare results obtained by classical technique with those obtained by piezocision and analyze their impact on periodontal tissues in the long term...
June 2017: L' Orthodontie Française
https://www.readbyqxmd.com/read/28587978/a-new-arginine-based-dental-adhesive-system-formulation-mechanical-and-anti-caries-properties
#8
Saulo Geraldeli, Eveline F Soares, Andres J Alvarez, Tanaz Farivar, Robert C Shields, Mario A C Sinhoreti, Marcelle M Nascimento
Secondary caries at the margins of composite restorations has been attributed to adhesive failure and consequent accumulation of cariogenic biofilms. OBJECTIVES: to develop and evaluate an etch-and-rinse adhesive system containing arginine for sustainable release and recharge without affecting its mechanical properties. Arginine metabolism by oral bacteria generates ammonia, which neutralizes glycolytic acids and creates a neutral environmental pH that is less favorable to the growth of caries pathogens, thus reducing the caries risk at the tooth-composite interface...
June 3, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28578434/artificial-enamel-induced-by-phase-transformation-of-amorphous-nanoparticles
#9
Kazuo Onuma, Mayumi Iijima
Human tooth enamel has tightly packed c-axis-oriented hydroxyapatite (HAP: Ca10(PO4)6(OH)2) nanorods with high elastic modulus. Fabrication of an enamel architecture in vitro supports the repair of teeth using HAP; however, existing methods require complex and laborious steps to form an enamel-like structure. Here we present a very simple and effective technique for forming artificial enamel in near-physiological solution using a substrate composed of amorphous calcium phosphate (ACP) nanoparticles. Without any functionalized modification of the substrate surface, faint dissolution and successive phase transformation automatically induce formation of an intermediate layer of low-crystalline HAP nanoparticles, on which highly oriented HAP nanorods grow by geometrical selection...
June 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28576771/bmp-signaling-orchestrates-a-transcriptional-network-to-control-the-fate-of-mesenchymal-stem-cells-in-mice
#10
Jifan Feng, Junjun Jing, Jingyuan Li, Hu Zhao, Vasu Punj, Tingwei Zhang, Jian Xu, Yang Chai
Signaling pathways are used reiteratively in different developmental processes yet produce distinct cell fates through specific downstream transcription factors. In this study, we used tooth root development as a model to investigate how the BMP signaling pathway regulates transcriptional complexes to direct the fate determination of multipotent mesenchymal stem cells (MSCs). We first identified the MSC population supporting mouse molar root growth as Gli1+ cells. Using a Gli1-mediated transgenic animal model, our results provide the first in vivo evidence that BMP signaling activity is required for the odontogenic differentiation of MSCs...
June 2, 2017: Development
https://www.readbyqxmd.com/read/28573092/current-methods-for-the-treatment-of-alveolar-cleft
#11
REVIEW
Nak Heon Kang
Alveolar cleft is a tornado-shaped bone defect in the maxillary arch. The treatment goals for alveolar cleft are stabilization and provision of bone continuity to the maxillary arch, permitting support for tooth eruption, eliminating oronasal fistulas, providing an improved esthetic result, and improving speech. Treatment protocols vary in terms of the operative time, surgical techniques, and graft materials. Early approaches including boneless bone grafting (gingivoperiosteoplasty) and primary bone graft fell into disfavor because they impaired facial growth, and they remain controversial...
May 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/28573052/decoronation-an-alternative-treatment-for-replacement-root-resorption
#12
Marianne Sala, Asunción Mendoza-Mendoza, Rosa-María Yañez-Vico
INTRODUCTION: Ankylosis and disrupted or altered root development are frequent complications associated with intrusive luxation and tooth avulsion lesions. Various forms of treatment have been described according to the severity of the trauma and root development. The literature shows that decoronation is an ideal treatment in cases where replacement resorption occurs. METHODS: Two clinical cases are presented: involving intrusive luxation [15-year-old female patient with an affected maxillary left lateral incisor (2...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28571484/sclerostin-deficiency-promotes-reparative-dentinogenesis
#13
A-M Collignon, N Amri, J Lesieur, J Sadoine, S Ribes, S Menashi, S Simon, A Berdal, G Y Rochefort, C Chaussain, C Gaucher
In humans, the SOST gene encodes sclerostin, an inhibitor of bone growth and remodeling, which also negatively regulates the bone repair process. Sclerostin has also been implicated in tooth formation, but its potential role in pulp healing remains unknown. The aim of this study was to explore the role of sclerostin in reparative dentinogenesis using Sost knockout mice ( Sost(-/-)). The pulps of the first maxillary molars were mechanically exposed in 3-mo-old Sost(-/-) and wild-type (WT) mice ( n = 14 mice per group), capped with mineral trioxide aggregate cement, and the cavities were filled with a bonded composite resin...
March 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28560015/a-mini-review-focused-on-the-proangiogenic-role-of-silicate-ions-released-from-silicon-containing-biomaterials
#14
REVIEW
Khandmaa Dashnyam, Ahmed El-Fiqi, Jennifer O Buitrago, Roman A Perez, Jonathan C Knowles, Hae-Won Kim
Angiogenesis is considered an important issue in the development of biomaterials for the successful regeneration of tissues including bone. While growth factors are commonly used with biomaterials to promote angiogenesis, some ions released from biomaterials can also contribute to angiogenic events. Many silica-based biomaterials have been widely used for the repair and regeneration of tissues, mainly hard tissues such as bone and tooth structure. They have shown excellent performance in bone formation by stimulating angiogenesis...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28559355/assessing-human-weaning-practices-with-calcium-isotopes-in-tooth-enamel
#15
Théo Tacail, Béatrice Thivichon-Prince, Jeremy E Martin, Cyril Charles, Laurent Viriot, Vincent Balter
Weaning practices differ among great apes and likely diverged during the course of human evolution, but behavioral inference from the fossil record is hampered by a lack of unambiguous biomarkers. Here, we show that early-life dietary transitions are recorded in human deciduous tooth enamel as marked variations in Ca isotope ratios (δ(44/42)Ca). Using a sequential microsampling method along the enamel growth axis, we collected more than 150 enamel microsamples from 51 deciduous teeth of 12 different modern human individuals of known dietary histories, as well as nine enamel samples from permanent third molars...
May 30, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28539292/-gelatin-alginate-hydrogel-scaffolds-prepared-by-3d-bioprinting-promotes-cell-adhesion-and-proliferation-of-human-dental-pulp-cells-in-vitro
#16
Hai-Yue Yu, Dan-Dan Ma, Bu-Ling Wu
OBJECTIVE: To evaluate the cytotoxicity of gelatin/alginate hydrogel scaffolds prepared by 3D bioprinting in human dental pulp cells (HDPCs) and compare the cell adhesion and proliferation of the cells seeded in the biomaterial using two different methods. METHODS: HDPCs isolated by tissue block culture and enzyme digestion were cultured and passaged. Gelatin/alginate hydrogel scaffolds were printed using a bioplotter, and the cytotoxicity of the aqueous extracts of the scaffold material was tested in the third passage of HDPCs using cell counting kit-8...
May 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28537502/suitability-of-different-natural-and-synthetic-biomaterials-for-dental-pulp-tissue-engineering
#17
Kerstin M Galler, Ferdinand Brandl, Susanne Kirchhof, Matthias Widbiller, Andreas Eidt, Wolfgang Buchalla, Achim Goepferich, Gottfried Schmalz
Dental pulp tissue engineering is possible after insertion of pulpal stem cells combined with a scaffold into empty root canals. Commonly used biomaterials are collagen or poly(lactic) acid, which are either difficult to modify or to insert into such a narrow space. New hydrogel scaffolds with bioactive, specifically tailored functions could optimize the conditions to engineer dental pulp. Different synthetic and natural hydrogels were tested for their suitability to engineer dental pulp. Two functionalized modifications of polyethylene glycol were developed in this study and compared to a self-assembling peptide as well as to collagen and fibrin...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28529149/autotransplantation-of-third-molars-with-platelet-rich-plasma-for-immediate-replacement-of-extracted-non-restorable-teeth-a-case-series
#18
Jorge Gonzalez-Ocasio, Mark Stevens
PURPOSE: The aim of this study was to examine the use of platelet-rich plasma (PRP) for autotransplantation of third molars as a successful technique to provide immediate tooth structure for space maintenance and masticatory function when premature loss of a permanent tooth occurs and other dental restorative options are not indicated. MATERIALS AND METHODS: This study included 10 healthy patients 10 to 17 years of age with at least 1 immature third molar (one to two thirds of root formation) used to replace extracted non-restorable teeth...
April 25, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28527696/essential-roles-of-g9a-in-cell-proliferation-and-differentiation-during-tooth-development
#19
Taichi Kamiunten, Hisashi Ideno, Akemi Shimada, Yoshinori Arai, Tatsuo Terashima, Yasuhiro Tomooka, Yoshiki Nakamura, Kazuhisa Nakashima, Hiroshi Kimura, Yoichi Shinkai, Makoto Tachibana, Akira Nifuji
Teeth develop through interactions between epithelial and mesenchymal tissues mediated by a signaling network comprised of growth factors and transcription factors However, little is known about how epigenetic modifiers affect signaling pathways and thereby regulate tooth formation. We previously reported that the histone 3 lysine 9 (H3K9) methyltransferase (MTase) G9a is specifically enriched in the tooth mesenchyme during mouse development. In this study, we investigated the functions of G9a in tooth development using G9a conditional knockout (KO) mice...
May 17, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28516735/assessment-of-trophic-ecomorphology-in-non-alligatoroid-crocodylians-and-its-adaptive-and-taxonomic-implications
#20
Masaya Iijima
Although the establishment of trophic ecomorphology in living crocodylians can contribute to estimating feeding habits of extinct large aquatic reptiles, assessment of ecomorphological traits other than the snout shape has scarcely been conducted in crocodylians. Here, I tested the validity of the proposed trophic ecomorphological traits in crocodylians by examining the correlation between those traits and the snout shape (an established trophic ecomorphology), using 10 non-alligatoroid crocodylian species with a wide range of snout shape...
May 18, 2017: Journal of Anatomy
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