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https://www.readbyqxmd.com/read/28644741/ras-signaling-regulates-stem-cells-and-amelogenesis-in-the-mouse-incisor
#1
X Zheng, A F Goodwin, H Tian, A H Jheon, O D Klein
The role of Ras signaling during tooth development is poorly understood. Ras proteins-which are activated by many upstream pathways, including receptor tyrosine kinase cascades-signal through multiple effectors, such as the mitogen-activated protein kinase (MAPK) and PI3K pathways. Here, we utilized the mouse incisor as a model to study how the MAPK and PI3K pathways regulate dental epithelial stem cells and amelogenesis. The rodent incisor-which grows continuously throughout the life of the animal due to the presence of epithelial and mesenchymal stem cells-provides a model for the study of ectodermal organ renewal and regeneration...
June 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28643923/micro-anatomical-responses-in-periodontal-complexes-of-mice-to-calibrated-orthodontic-forces-on-the-crown
#2
A Pal, L Chen, L Yang, F Yang, B Meng, A H Jheon, S P Ho
OBJECTIVE: Correlating mechanical forces with quantifiable physical changes in the dentoalveolar complex. SETTING AND SAMPLE POPULATION: Male 6-week C57BL/6 mice (N=3), micro X-ray-computed tomography; post-analysis software to extract physical changes in periodontal ligament (PDL)-space. MATERIALS AND METHODS: Silicone-elastic bands were placed between maxillary molars for 1 week, with the contralateral side as internal control. Average displacements between crowns and roots, and changes in PDL-spaces were evaluated by registering X-ray tomograms of experimental and control hemi-maxillae...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28639687/risk-indicators-of-early-childhood-caries-ecc-in-children-with-high-treatment-needs
#3
Iris Kraljevic, Cornelia Filippi, Andreas Filippi
Early childhood caries (ECC) represents a major health and economic problem worldwide. Its consequences such as early pain experience may affect the immediate and long-term quality of life of the child. In very young and uncooperative children the therapy of ECC is often viable only under general anesthesia. After treatment these affected children have a higher risk for future caries either soon thereafter, or later in life. The aim of the present study was to determine risk indicators and their correlation among children with high caries prevalence and high treatment needs, in order to facilitate the development of targeted prophylaxis programs that would reduce future occurrences of ECC or at least positively influence the outcome...
2017: Swiss Dental Journal
https://www.readbyqxmd.com/read/28639142/serrated-polyps-of-colon-and-rectum-a-clinicopathologic-review
#4
REVIEW
Bita Geramizadeh, Scott Robertson
BACKGROUND: In the past decade, there have been significant changes in the classification and nomenclature of colorectal polyps. Previously, only two groups of lesions were widely recognized, the adenoma and the hyperplastic polyp. Adenomas were considered the only precursor of colorectal cancer, and hyperplastic polyps were considered innocent with no malignant potential. However, recent discoveries about molecular pathways of colorectal cancers have significantly changed our understanding of these neoplasms...
June 22, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28638345/heterogeneity-and-developmental-connections-between-cell-types-inhabiting-teeth
#5
REVIEW
Jan Krivanek, Igor Adameyko, Kaj Fried
Every tissue is composed of multiple cell types that are developmentally, evolutionary and functionally integrated into the unit we call an organ. Teeth, our organs for biting and mastication, are complex and made of many different cell types connected or disconnected in terms of their ontogeny. In general, epithelial and mesenchymal compartments represent the major framework of tooth formation. Thus, they give rise to the two most important matrix-producing populations: ameloblasts generating enamel and odontoblasts producing dentin...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28635867/-the-investigations-into-the-amino-acid-composition-of-the-tooth-for-the-purpose-of-forensic-medical-personality-identification
#6
Yu I Pigolkin, G V Zolotenkova, P S Velenko, B N Izotov
The increasingly greater requirements for the new approaches to the forensic medical personality identification necessitate the extensive search for and the development of the precise methods enabling the experts to determine the general personality signs in the cases of mass mortality and the large number of victims with the conspicuous post-mortem changes in their appearance including those associated with putrefaction and strong fragmentation of the bodies. This article presents the analytical review demonstrating that determination of the victims' age in the combination with the analysis of the amino acid composition of dental tissues provides a promising tool for the investigations not only in the fields of archeology and anthropology but also for the purpose of personality identification in forensic medicine...
2017: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/28631261/distinct-post-translational-features-of-type-i-collagen-are-conserved-in-mouse-and-human-periodontal-ligament
#7
D M Hudson, M Garibov, D R Dixon, T Popowics, D R Eyre
BACKGROUND AND OBJECTIVE: Specifics of the biochemical pathways that modulate collagen cross-links in the periodontal ligament (PDL) are not fully defined. Better knowledge of the collagen post-translational modifications that give PDL its distinct tissue properties is needed to understand the pathogenic mechanisms of human PDL destruction in periodontal disease. In this study, the post-translational phenotypes of human and mouse PDL type I collagen were surveyed using mass spectrometry...
June 20, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28627032/tooth-autotransplantation-as-a-pillar-for-3d-regeneration-of-the-alveolar-process-after-severe-traumatic-injury-a-case-report
#8
Eduardo Anitua, Maialen Urkia-Mendinueva, Sandra Galan-Bringas, Alia Murias-Freijo, Mohammad Hamdan Alkhraisat
In dental traumatology, the loss of teeth and the supporting alveolar bone in children compromises the proper development of maxillofacial structures and also limits the solutions that can be offered. In this case report, multidisciplinary management is described of a child with a significant loss of alveolar bone and associated teeth due to a traffic accident at 8 years of age. The management involved staged teeth autotransplatation into surgically prepared sites with bone expanders, orthodontic treatment and dental implants...
June 18, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28626284/near-infrared-imaging-of-enamel-hypomineralization-due-to-developmental-defects
#9
Robert C Lee, Andrew Jang, Daniel Fried
The increasing prevalence of mild hypomineralization due to developmental defects on tooth surfaces poses a challenge for caries detection and caries risk assessment and reliable methods need to be developed to discriminate such lesions from active caries lesions that need intervention. Previous studies have demonstrated that areas of hypomineralization are typically covered with a relatively thick surface layer of highly mineralized and transparent enamel similar to arrested lesions. Seventy-six extracted human teeth with mild to moderate degrees of suspicious fluorosis were imaged using near-infrared reflectance and transillumination...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28624454/ameloblast-like-characteristics-of-human-hertwig-s-epithelial-rest-of-malassez-epithelial-rest-of-malassez-cells-via-interaction-with-stem-cells-from-human-exfoliated-deciduous-teeth
#10
Hyun Nam, Gee-Hye Kim, Jae-Won Kim, Jae Cheoun Lee, Kyunghoon Lee, Sun-Ho Lee
Tooth develops through reciprocal interactions between oral epithelium and oral mesenchyme. To regenerate tooth, both components are necessary to mimic epithelial-mesenchymal interactions. In adult teeth, Hertwig's epithelial root sheath/Epithelial rests of Malassez (HERS/ERM) cells are unique epithelial cells which are derived from oral epithelium. In this study, we investigated whether HERS/ERM cells could have ameloblast-like characteristics via interaction with stem cells from human exfoliated deciduous teeth (SHEDs) as an oral mesenchymal component...
June 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28623787/simultaneous-determination-of-btex-and-their-metabolites-using-solid-phase-microextraction-followed-by-hplc-or-gc-ms-an-application-in-teeth-as-environmental-biomarkers
#11
Johannes L González, Albert Pell, Montserrat López-Mesas, Manuel Valiente
Applications of benzene, toluene, ethylbenzene, and o-, m-, and p-xylenes (BTEX) release them into the environment exposing living organism. These endocrine disruptors are toxic, highly volatile and easily absorbed by the lungs and can cause adverse consequences for the human health as neurological diseases and cancer. A method for the analysis of BTEX and its metabolites (phenols and aromatic acids) in teeth is presented. The method consists in a one-step simple extraction procedure from spiked tooth using NaOH solution followed by SPME-HPLC or HS-SPME-GC/MS determination...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28622928/dental-development-and-age-at-death-of-the-holotype-of-anapithecus-hernyaki-rud-9-using-synchrotron-virtual-histology
#12
Adeline Le Cabec, M Christopher Dean, David R Begun
The chronology of dental development and life history of primitive catarrhines provides a crucial comparative framework for understanding the evolution of hominoids and Old World monkeys. Among the extinct groups of catarrhines are the pliopithecoids, with no known descendants. Anapithecus hernyaki is a medium-size stem catarrhine known from Austria, Hungary and Germany around 10 Ma, and represents a terminal lineage of a clade predating the divergence of hominoids and cercopithecoids, probably more than 30 Ma...
July 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28621833/multiple-external-cervical-root-resorptions-after-home-bleaching-treatment-with-22-carbamide-peroxide
#13
Glauco Rodrigues Velloso, Marcos Motta de Freitas, Adriana Terezinha Neves Novellino Alves, Alan Roger Santos Silva, Eliane Dos Santos Porto Barboza, Vittorio Moraschini
Invasive multiple cervical root resorptions after vital tooth bleaching is a rare condition. The aim of this article is to present a case of multiple external cervical root resorptions (ECRR) after a misguided home whitening treatment. A 34-year-old male patient presented with slight sensitivity and mobility in several teeth. Despite the manufacturer's recommendations, the patient used a 22% carbamide peroxide-based tooth bleaching gel at home for 4 consecutive days, at night, on the upper and lower arches...
June 16, 2017: Australian Dental Journal
https://www.readbyqxmd.com/read/28621563/reduced-mastication-impairs-memory-function
#14
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/28621279/comparative-evaluation-of-stress-developed-on-rotary-retreatment-instruments-during-retrieval-of-gutta-percha
#15
Dhanasekaran Sihivahanan, T Vinay Kumar Reddy, Anchu Rachel Thomas, Natarajan Senthilnathan, Murali Sivakumar, Sushmita Shivanna
AIM: The aim of the study is to compare the maximum stress distribution on the rotary retreatment instruments within the root canal at cervical, middle, and the apical one-third during retreatment of gutta-percha. MATERIALS AND METHODS: A human mandibular premolar was scanned, and three-dimensional geometry of the root was reconstructed using finite element analysis (FEA) software package (ANSYS). The basic model was kept unchanged; tooth models were created using the same dimensions and divided into two groups as follows: Group I: ProTaper Universal retreatment system and group II: Mtwo rotary retreatment system...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28620405/leafletanalyzer-an-automated-software-for-quantifying-comparing-and-classifying-blade-and-serration-features-of-compound-leaves-during-development-and-among-induced-mutants-and-natural-variants-in-the-legume-medicago-truncatula
#16
Fuqi Liao, Jianling Peng, Rujin Chen
Diverse leaf forms ranging from simple to compound leaves are found in plants. It is known that the final leaf size and shape vary greatly in response to developmental and environmental changes. However, changes in leaf size and shape have been quantitatively characterized only in a limited number of species. Here, we report development of LeafletAnalyzer, an automated image analysis and classification software to analyze and classify blade and serration characteristics of trifoliate leaves in Medicago truncatula...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28619974/twenty-nine-month-follow-up-of-a-paediatric-zirconia-dental-crown
#17
Serena Lopez Cazaux, Isabelle Hyon, Tony Prud'homme, Sylvie Dajean Trutaud
The aim of this paper is to present the long-term follow-up of one paediatric zirconia crown on a deciduous molar. Preformed crowns are part of the armamentarium in paediatric dentistry. In recent years, aesthetic alternatives to preformed metal crowns have been developed, first preveneered crowns and then zirconia crowns. This paper describes the restoration of a primary molar with a zirconia crown (EZ-Pedo, Loomis, California, USA) in an 8-year-old boy. In this clinical case, the protocol for the implementation and maintenance of zirconia crowns is detailed...
June 14, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28619155/black-pigmented-anaerobic-bacteria-associated-with-ovine-periodontitis
#18
Ana C Borsanelli, Elerson Gaetti-Jardim, Christiane M Schweitzer, Lorenzo Viora, Valentina Busin, Marcello P Riggio, Iveraldo S Dutra
Periodontitis is a polymicrobial infectious disease that causes occlusion change, tooth loss, difficulty in rumination, and premature culling of animals. This study aimed to detect species of the genera Porphyromonas and Prevotella present in the periodontal pocket of sheep with lesions deeper than 5mm (n=14) and in the gingival sulcus of animals considered periodontally healthy (n=20). The presence of microorganisms was evaluated by polymerase chain reaction (PCR) using specific primers for Porphyromonas asaccharolytica, Porphyromonas endodontalis, Porphyromonas gingivalis, Porphyromonas gulae, Prevotella buccae, Prevotella intermedia, Prevotella loescheii, Prevotella melaninogenica, Prevotella nigrescens, Prevotella oralis, and Prevotella tannerae...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28618020/bacterial-colonization-of-resin-composite-cements-influence-of-material-composition-and-surface-roughness
#19
Stephanie Glauser, Monika Astasov-Frauenhoffer, Johannes A Müller, Jens Fischer, Tuomas Waltimo, Nadja Rohr
So-called secondary caries may develop in the cement gap between the tooth and the bonded restoration. Cement materials with a low susceptibility to biofilm formation are therefore desirable. In the present study, the adhesion of Strepococcus mutans onto three adhesive (Multilink Automix, RelyX Ultimate, and Panavia V5) and three self-adhesive (Multilink Speed Cem, RelyX Unicem 2 Automix, and Panavia SA plus) resin composite cements was evaluated. Previous studies have failed to evaluate concomitantly the effect of both the composition of the cements and their surface roughness on biofilm formation...
June 15, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28617874/candida-albicans-mannans-mediate-streptococcus-mutans-exoenzyme-gtfb-binding-to-modulate-cross-kingdom-biofilm-development-in-vivo
#20
Geelsu Hwang, Yuan Liu, Dongyeop Kim, Yong Li, Damian J Krysan, Hyun Koo
Candida albicans is frequently detected with heavy infection by Streptococcus mutans in plaque-biofilms from children with early-childhood caries (ECC). This cross-kingdom biofilm contains an extensive matrix of extracellular α-glucans that is produced by an exoenzyme (GtfB) secreted by S. mutans. Here, we report that mannans located on the outer surface of C. albicans cell-wall mediates GtfB binding, enhancing glucan-matrix production and modulating bacterial-fungal association within biofilms formed in vivo...
June 2017: PLoS Pathogens
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