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https://www.readbyqxmd.com/read/28532521/animal-board-invited-review-sheep-birth-distribution-in-past-herds-a-review-for-prehistoric-europe-6th-to-3rd-millennia-bc
#1
M Balasse, A Tresset, A Bălăşescu, E Blaise, C Tornero, H Gandois, D Fiorillo, É Á Nyerges, D Frémondeau, E Banffy, M Ivanova
In temperate latitudes sheep have a seasonal reproductive behaviour, which imposes strong constraints on husbandry in terms of work organization and availability of animal products. During the last 50 years, researchers have focused on understanding the mechanisms driving small ruminants' reproduction cycles and finding ways to control them. This characteristic is inherited from their wild ancestor. However, the history of its evolution over the 10 millennia that separates present day European sheep from their Near Eastern ancestors' remains to be written...
May 23, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28532068/synthetic-peptides-derived-from-salivary-proteins-and-the-control-of-surface-charge-densities-of-dental-surfaces-improve-the-inhibition-of-dental-calculus-formation
#2
Bernd Grohe
Peptides descended from the salivary proteins statherin and histatin were recently identified in saliva and the acquired enamel pellicle (AEP), a proteomic layer coated on enamel. In particular, the statherin phosphopeptide DpSpSEEKFLR (DSS) was found to adsorb to enamel-like hydroxyapatite and inhibit plaque-related crystal formation. To determine the mechanism of these processes, we studied peptide-crystal interactions based on the sequences DSS and RKFHEKHHSHRGYR (RKF). The latter is a basic histatin sequence showing antimicrobial effects...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531879/scaffold-requirements-for-periodontal-regeneration-with-enamel-matrix-derivative-proteins
#3
Alessandra Apicella, Peggy Heunemann, Laurent Dejace, Matteo Marascio, Christopher J G Plummer, Peter Fischer
Periodontitis affects the attachment of natural teeth, and infection or inflammation associated with periodontitis may affect peri-implant tissues. Enamel matrix derivative (EMD) proteins provide stimulation for self-regeneration of the damaged tissue when applied to wide intrabony defects as part of a mixture with bone graft material. As a first step of the process enhancing cell proliferation and ligament formation, we demonstrated that EMD protein precipitation depends strongly on the physical and chemical characteristics of the bone grafts used in the mixture...
May 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28530472/telomerase-expression-in-medaka-oryzias-melastigma-pharyngeal-teeth
#4
W H Tan, P E Witten, C Winkler, D W T Au, A Huysseune
Nonmammalian vertebrates have the capacity of lifelong tooth replacement. In all vertebrates, tooth formation requires contact and interaction between the oral or pharyngeal epithelium and the underlying mesenchyme. To secure lifelong replacement, the presence of odontogenic stem cells has been postulated, particularly in the epithelial compartment. This study uses an advanced teleost fish species, the marine medaka Oryzias melastigma, a close relative to Oryzias latipes, to examine the expression and distribution of telomerase reverse transcriptase (Tert), the catalytic unit of telomerase, in developing pharyngeal teeth and to relate these data to the proliferative activity of the cells...
June 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28530007/preventive-effect-of-cpp-acpf-paste-and-fluoride-toothpastes-against-erosion-and-erosion-plus-abrasion-%C3%A2-in-vitro-a-3d-profilometric-analysis
#5
Genaina Guimarães Soares, Pâmela Amorim Magalhães, Ana Beatriz Monteiro Fonseca, Monica Almeida Tostes, Eduardo Moreira da Silva, Thereza Christina Lopes Coutinho
PURPOSE: To evaluate the effect of CPP-ACPF paste and fluoride toothpastes on enamel subjected to erosion and erosion plus abrasion in vitro. MATERIALS AND METHODS: A total of 220 human enamel blocks were divided into eleven groups (n = 20): CPP-ACPF paste (MPP), potassium nitrate/sodium fluoride toothpaste (PE), sodium fluoride toothpaste (FD), fluoride-free toothpaste (SO) and control (erosion only with no paste or toothpastes; CO) according to the experimental design: erosion or erosion plus abrasion immediately after erosion (ERO+I-ABR) or 30 min after erosion (ERO+30min-ABR)...
May 19, 2017: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/28528931/evaluation-of-alternative-monomers-to-hema-for-dental-applications
#6
Sven Tauscher, Jörg Angermann, Yohann Catel, Norbert Moszner
OBJECTIVE: The objective of this work is to find potential alternative monomers to 2-hydroxyethyl methacrylate (HEMA) for dental materials (self-etch adhesives and luting composites). METHODS: Monomers 1-9 were tested as potential HEMA substitutes. Methacrylates 4, 5 and 6 and (N-methyl)acrylamides 7-9 were synthesized and characterized by (1)H NMR spectroscopy. The reactivity of each monomer was studied using photo-DSC. Mixtures of monomers 1-9 with the urethane dimethacrylate UDMA (1/1: wt/wt) were formulated and cured...
May 18, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28527696/essential-roles-of-g9a-in-cell-proliferation-and-differentiation-during-tooth-development
#7
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/28523304/optical-coherence-tomography-applications-in-tooth-wear-diagnosis
#8
Veronica MercuŢ, Sanda Mihaela Popescu, Monica Scrieciu, Marina Olimpia Amărăscu, Mihaela Vătu, Oana Andreea Diaconu, Eugen Osiac, Ştefan Mugurel Ghelase
Dental wear represents an irreversible loss of dental hard tissue under the action of physical, chemical and mechanical factors, excluding dental caries and acute trauma. Four clinical forms of dental wear are described: erosion, attrition, abfraction, and abrasion. Most experts agree that in each clinical form multiple etiological factors are involved, one being predominant. Optical coherence tomography (OCT) is a non-invasive optical method characterized by a micronic resolution. The applications of this type of investigation are multiple in the medical field in recent years, and OCT is gaining a growing importance in dentistry...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28521915/a-tall-rostral-hook-in-a-medieval-horse-premolar-tooth
#9
Suvi Viranta, Kristiina Mannermaa
Development of dental abnormalities due to improper occlusal wear is common among modern domestic horses. This phenomenon often is attributed to jaw conformation. Rostral mandibular hooks may develop in horses with underjet or mandibular prognathism, a condition where the lower jaw protrudes forward, beyond the upper jaw. Less abrasive diet, free of phytoliths and matrix-like plant fibers, also may promote enamel and focal overgrowths of equine dentition. Here we report a rostral mandibular hook in a lower premolar tooth of a medieval horse, found in a spring deposit in Levänluhta, Osthrobothnia, Finland...
June 2017: International Journal of Paleopathology
https://www.readbyqxmd.com/read/28521912/stressing-out-in-medieval-denmark-an-investigation-of-dental-enamel-defects-and-age-at-death-in-two-medieval-danish-cemeteries
#10
Julia A Gamble, Jesper L Boldsen, Robert D Hoppa
The influence of early life stress on later life experiences has become a major focus of research in medicine and more recently in bioarchaeology. Dental enamel, which preserves a record of childhood stress events, represents an important resource for this investigation when paired with the information from adult skeletal remains, such as age at death. The purpose of this research was to use a life history approach to the exploration of sex differences in the relationship between childhood stress and adult longevity by examining accentuated striae of Retzius (AS)...
June 2017: International Journal of Paleopathology
https://www.readbyqxmd.com/read/28521113/real-time-imaging-of-gap-progress-during-and-after-composite-polymerization
#11
J Hayashi, Y Shimada, J Tagami, Y Sumi, A Sadr
The aims of this study were to observe the behavior of composite and formation of gaps during and immediately after light polymerization using swept source optical coherence tomography (OCT) and to compare the interfacial integrity of adhesives in cavities through 3-dimensional (3D) image analysis. Forty tapered cylindrical cavities (4-mm diameter, 2-mm depth) were prepared in bovine incisors and restored using Bond Force (BF), Scotchbond Universal Adhesive (SBU), OptiBond XTR (XTR), or Clearfil SE Bond 2 (SE2), followed by Estelite Flow Quick flowable composite...
May 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28518210/regular-graveyard-in-the-stronghold-versus-settlement-burials-in-the-bailey-comparison-of-early-medieval-populations-from-pohansko-czech-republic
#12
Kateřina Kalová, Renáta Přichystalová, Kateřina Boberová, Alena Pavlůsková
The aim of the study is to identify possible differences in the prevalence of biological stress markers (cribra orbitalia, linear enammel hypoplasia), dental caries, activity markers (Schmorl's nodes) and markers of violence (traumatic lesions) in populations from a typical graveyard around the first church (9(th)-10(th) century AD) in the stronghold and from settlement burials in the southern bailey (second half of the 9(th) - beginning of the 10(th) century AD) of Slavs from Pohansko (Czech Republic). Cribra orbitalia and enamel hypoplasia did not markedly differ in either population...
May 15, 2017: Anthropologischer Anzeiger; Bericht über die Biologisch-anthropologische Literatur
https://www.readbyqxmd.com/read/28516412/optimization-of-adhesive-pastes-for-dental-caries-prevention
#13
Patteera Sodata, Apa Juntavee, Niwut Juntavee, Jomjai Peerapattana
Dental caries prevention products available on the market contain only remineralizing agents or antibacterial agents. This study aimed to develop adhesive pastes containing calcium phosphate and α-mangostin for dental caries prevention using the optimization technique. Calcium phosphate was used as a remineralizing agent, and extracted α-mangostin was used as an antibacterial agent. The effect of the independent variables, which were fumed silica, Eudragit(®) EPO, polyethylene glycol, and ethyl alcohol, on the responses was investigated...
May 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28515694/fam20a-gene-mutation-amelogenesis-or-ectopic-mineralization
#14
Guilhem Lignon, Fleur Beres, Mickael Quentric, Stephan Rouzière, Raphael Weil, Muriel De La Dure-Molla, Adrien Naveau, Renata Kozyraki, Arnaud Dessombz, Ariane Berdal
Background and objective:FAM20A gene mutations result in enamel renal syndrome (ERS) associated with amelogenesis imperfecta (AI), nephrocalcinosis, gingival fibromatosis, and impaired tooth eruption. FAM20A would control the phosphorylation of enamel peptides and thus enamel mineralization. Here, we characterized the structure and chemical composition of unerupted tooth enamel from ERS patients and healthy subjects. Methods: Tooth sections were analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28514353/-mantle-dentin-as-biomodel-of-materials-for-structural-teeth-restoration
#15
A V Starodubova, Yu A Vinnichenko, I Ya Pourovskaya, F S Rusanov
The article describes a structural element of natural teeth - mantle dentin. It has been shown that the presence of this element in the structure of a natural tooth largely ensures its strength under the influence of repeated loads in a functional oral environment and arrests crack growth at the enamel/dentine interface. This later effect is explained by the influence of a thin layer of mantle dentine, which has physical and mechanical characteristics different from that of the main dentin.
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28513613/defects-in-the-acid-phosphatase-acpt-cause-recessive-hypoplastic-amelogenesis-imperfecta
#16
Claire El Smith, Laura LE Whitehouse, James A Poulter, Steven J Brookes, Peter F Day, Francesca Soldani, Jennifer Kirkham, Chris F Inglehearn, Alan J Mighell
We identified two homozygous missense variants (c.428C>T, p.(T143M) and c.746C>T, p.(P249L)) in ACPT, the gene encoding acid phosphatase, testicular, which segregates with hypoplastic amelogenesis imperfecta in two unrelated families. ACPT is reported to play a role in odontoblast differentiation and mineralisation by supplying phosphate during dentine formation. Analysis by computerised tomography and scanning electron microscopy of a primary molar tooth from an individual homozygous for the c.746C>T variant revealed an enamel layer that was hypoplastic, but mineralised with prismatic architecture...
May 17, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#17
R Nalcaci, B Temel, S Çokakoğlu, H Türkkahraman, S Üsümez
AIM: To evaluate the effects of laser etching on the shear bond strengths (SBS) and failure modes of brackets bonded to fluorosed enamel. MATERIALS AND METHODS: This in vitro study included 34 fluorosed and 34 nonfluorosed teeth. Teeth were divided into four subgroups according to the etching procedure: Group (A) normal enamel etched with 37% phosphoric acid for 15 s, Group (B) nonfluorosed enamel etched with erbium:yttrium aluminum garnet (Er: YAG) laser for 15 s, Group (C) fluorosed enamel etched with 37% phosphoric acid for 30 s, Group (D) fluorosed enamel etched with Er: YAG laser for 30 s...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28512546/evaluation-of-the-effect-of-different-enamel-surface-treatments-and-waiting-times-on-the-staining-prevention-after-bleaching
#18
Débora Monteiro, Allyson Moreira, Tulimar Cornacchia, Cláudia Magalhães
BACKGROUND: Bleached dental enamel can be more susceptible to staining than the enamel that has never been bleached, especially right after tooth bleaching. The aim of this study is to evaluate the effect of surface treatments and waiting time prior to contact with dye on bleached enamel staining susceptibility. MATERIAL AND METHODS: One hundred teeth were bleached with 35% hydrogen peroxide (Whiteness HP, FGM) and randomly assigned to G1 artificial saliva, G2 2% sodium fluoride (Flugel, Nova DFL), G3 casein phosphopeptide-amorphous calcium phosphate fluoride paste (CPP-ACPF, MI Paste Plus, GC America), G4 rinse for color maintenance after bleaching (Keep White Rinse, DMC) and G5 polishing with aluminum oxide-impregnated disks (Super Buff Disk, Shofu)...
May 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28512535/evaluation-of-surface-roughness-of-enamel-after-various-bonding-and-clean-up-procedures-on-enamel-bonded-with-three-different-bonding-agents-an-in-vitro-study
#19
Amit Goel, Atul Singh, Tarun Gupta, Ramandeep-Singh Gambhir
BACKGROUND: The purpose of this study was to analyze and compare the enamel surface roughness before bonding and after debonding, to find correlation between the adhesive remnant index and its effect on enamel surface roughness and to evaluate which clean-up method is most efficient to provide a smoother enamel surface. MATERIAL AND METHODS: 135 premolars were divided into 3 groups containing 45 premolars in each group. Group I was bonded by using moisture insensitive primer, Group II by using conventional orthodontic adhesive and Group III by using self-etching primer...
May 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28511604/duplicated-or-hybridized-peptide-functional-domains-promote-oral-homeostasis
#20
T Basiri, N D Johnson, E B Moffa, Y Mulyar, P L Serra Nunes, M A A M Machado, W L Siqueira
Proteins that have existed for millions of years frequently contain repeats of functional domains within their primary structure, thereby improving their functional capacity. In the evolutionary young statherin protein contained within the in vivo-acquired enamel pellicle (AEP), we identified a single functional domain (DR9) located within the protein N-terminal portion that exhibits a higher affinity for hydroxyapatite and more efficient protection against enamel demineralization compared to other native statherin peptides...
May 1, 2017: Journal of Dental Research
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