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https://www.readbyqxmd.com/read/28718921/homology-homoplasy-and-cusp-variability-at-the-enamel-dentine-junction-of-hominoid-molars
#1
Alejandra Ortiz, Shara E Bailey, Jean-Jacques Hublin, Matthew M Skinner
Evolutionary studies of mammalian teeth have generally concentrated on the adaptive and functional significance of dental features, whereas the role of development on phenotypic generation and as a source of variation has received comparatively little attention. The present study combines an evolutionary biological framework with state-of-the-art imaging techniques to examine the developmental basis of variation of accessory cusps. Scholars have long used the position and relatedness of cusps to other crown structures as a criterion for differentiating between developmentally homologous and homoplastic features, which can be evaluated with greater accuracy at the enamel-dentine junction (EDJ)...
July 18, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28717794/the-influence-of-maxillary-incisor-torque-on-the-esthetic-perception-%C3%A2-of-the-smile
#2
Javier Giron de Velasco, Pablo de la Cuadra, Gorka Urizar
PURPOSE: An esthetically pleasing smile is one of our patients' main goals. However, it is not always clear that the esthetic perceptions of patients and clinicians are the same. The purpose of this study was to evaluate and quantify the discrepancies in the esthetic perception of maxillary incisor torque among professionals, and between professionals and the general public. MATERIALS AND METHODS: A photograph of a 30-year-old woman was digitally manipulated to obtain nine smile images and nine full-profile images with various maxillary incisor torques, while maintaining the overjet...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28715173/influence-of-18-crown-6-ether-coordination-on-the-catalytic-activity-of-potassium-and-calcium-diarylphosphinites-in-hydrophosphorylation-reactions
#3
Stephan M Härling, Sven Krieck, Helmar Görls, Matthias Westerhausen
The addition of 18-crown-6 ether (1,4,7,10,13,16-hexaoxacyclooctadecane) to tetranuclear [(thf)K(OPAryl2)]4 and [(thf)4Ca(OPAryl2)2] yields the corresponding mononuclear complexes [(18C6)K(OPAryl2)] [Aryl = Ph (1a), Mes (1b)] and [(18C6)Ca(OPAryl2)2] [Aryl = Ph (2a), Mes (2b)]. The metathesis reaction of [(thf)K(OPAryl2)]4 with CaI2 yields the calciate [K2Ca(thf)x{OPMes2}4]. The addition of dimesitylphosphane oxide and crystallization from a hexane solution gives [K2Ca{OPMes2}4{Mes2P(O)H}] (3). The complexes [(thf)K(OPMes2)]4, [(thf)4Ca(OPMes2)2], 1b, 2b, and the calciate 3 are tested as catalysts in the hydrophosphorylation of isopropylisocyanate with dimesitylphosphane oxide, quantitatively yielding N-isopropyl(dimesitylphosphoryl)formamide...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28714310/rapid-high-yielding-syntheses-of-crown-ether-based-pyridyl-cryptands
#4
Terry Leon Price, Hanlie Ronel Wessels, Carla Slebodnick, Harry William Gibson
Pyridinium bis(trifluoromethylsulfonyl)imide (PyTFSI) templated syntheses of 2,6-pyridyl cryptands of cis(4,4')-dibenzo-30-crown-10 (3a), the p-bromobenzyloxy derivative 3b, bis(m-phenylene)-32-crown-10 (5), cis(4,4')-dibenzo-27S-crown-9 (7), cis(4,4')-dibenzo-27L-crown-9 (9) and cis(4,4')-dibenzo-24-crown-8 (11) are reported. Here we provide a fast (12 h), high yielding (89, 74, 80 and 62 % for 3a, 3b, 5 and 9, respectively) templation method without the use of a syringe pump. The yields for 7 (19 %) and 11 (26 %) were lower than with the previous pseudo-high dilution method, indicating ineffective templation in these cases...
July 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28713820/antioxidant-properties-of-natchez-and-triple-crown-blackberries-using-korean-traditional-winemaking-techniques
#5
Youri Joh, Niels Maness, William McGlynn
This research evaluated blackberries grown in Oklahoma and wines produced using a modified traditional Korean technique employing relatively oxygen-permeable earthenware fermentation vessels. The fermentation variables were temperature (21.6°C versus 26.6°C) and yeast inoculation versus wild fermentation. Wild fermented wines had higher total phenolic concentration than yeast fermented wines. Overall, wines had a relatively high concentration of anthocyanin (85-320 mg L(-1) malvidin-3-monoglucoside) and antioxidant capacity (9776-37845 µmol Trolox equivalent g(-1))...
2017: International journal of food science
https://www.readbyqxmd.com/read/28713768/dental-implants-placed-in-patients-with-mechanical-risk-factors-a-long-term-follow-up-retrospective-study
#6
Piero Papi, Stefano Di Carlo, Francesca Mencio, Daniele Rosella, Francesca De Angelis, Giorgio Pompa
OBJECTIVES: Risk factors in oral implantology are defined as local or systemic conditions that increase failure rates. The purpose of this paper is to evaluate the long-term survival rate of dental implants placed in patients presenting mechanical risk factors. MATERIALS AND METHODS: This retrospective study was conducted only with patients presenting at least one of the following risk factors were included: Bruxism; crown-to-implant (C/I) ratio <0.8; abutment angulation...
June 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28713735/an-assessment-of-factors-influencing-the-difficulty-in-third-molar-surgery
#7
Pavan Tenglikar, Ashwini Munnangi, Anand Mangalgi, Syed Furqhan Uddin, Santosh Mathpathi, Kundan Shah
BACKGROUND AND OBJECTIVES: Surgical removal of a mandibular impacted third molar is one among the most common oral surgical procedures. The objective of this study was to assess and identify risk indicators influencing extended operation time in relation to the surgical removal of mesioangular impacted mandibular third molar, position A, Class I and to evaluate the incidence of postoperative swelling, trismus, and pain. MATERIALS AND METHODS: A prospective cohort was implemented and the patients who presented for mandibular third molar removal which were impacted in position A, Class I were enlisted for the study...
January 2017: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28713415/repeated-stand-replacing-crown-fires-affect-seed-morphology-and-germination-in-aleppo-pine
#8
Antonio Saracino, Alessandro Bellino, Emilia Allevato, Antonio Mingo, Stefano Conti, Sergio Rossi, Giuliano Bonanomi, Domenico Carputo, Stefano Mazzoleni
Post-fire reproductive niche of Aleppo pine (Pinus halepensis) is deeply interlaced with fire products. Indeed, the high pH and low osmotic potentials of ash beds under burnt crowns constitute the main constraints to seed germination. In this study, we aim to investigate whether fire recurrence, through the physico-chemical constraints imposed by the ash beds, affects the reproduction ability of P. halepensis at the germination stage. To this aim, Aleppo pine seeds were collected in neighboring even-aged stands subjected to 0, 1, or 2 fires (namely fire cohorts), and seed morphology and germination performance, in terms of cumulative germination and germination kinetics, were studied under increasing osmotic potentials (from 0...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28713114/retrospective-assessment-of-healing-outcome-of-endodontic-treatment-for-mandibular-molars-with-c-shaped-root-canal
#9
Anika Bansal, Anuj Singh Parihar, Achla Sethi, Kishore Kumar Majety, Jaina Panjabi, Basanta Kumar Choudhury
INTRODUCTION: A thorough knowledge of the anatomic morphology of the root canal system is necessary for the long-term success of the root canal therapy. The occurrence of C-shaped root canal configuration is one such variation. Achievement of favorable prognosis after commencing root canal therapy in such teeth is one of the challenges imposed on the endodontist. Hence, we evaluated the healing occurring after endodontic therapy in patients with C-shaped root canals in mandibular molars...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28713021/the-path-to-the-genetic-code
#10
REVIEW
Maciej Szymanski, Jan Barciszewski
In December of 1966 the last nucleotide triplet in the genetic code has been assigned [1] thus completing years of studies aimed at deciphering the nature of the relationship between the sequences of genes and proteins. The end product, the table of the genetic code, was a crowning achievement of the quest to unravel the basic mechanisms underlying functioning of all living organisms on the molecular level.
July 13, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28711896/computer-tomographic-characteristics-of-root-length-incisors-and-canines-of-the-upper-and-lower-jaws-in-boys-and-girls-with-different-craniotypes-and-physiological-bite
#11
Аlla V Маrchenko, Іgor V Gunas, Tetyana O Petrushanko, Oksana А Serebrennikova, Yulia Yu Trofimenko
INTRODUCTION: In recent years, in world literature appeared research, which focuses on the study of relationships craniotypes with odonto-metric indicators, size, shape of the dental arches and occlusion. However, most of the experts focus on the study of individual features of the structure of the teeth-jaw system in people with different types of faces and aspects of sexual dimorphism and ethnic characteristics. Studies containing information about cranio-typological variability of the roots of teeth we did not encounter...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28711671/phylogenomic-analyses-of-539-highly-informative-loci-dates-a-fully-resolved-time-tree-for-the-major-clades-of-living-turtles-testudines
#12
H Bradley Shaffer, Evan McCartney-Melstad, Thomas J Near, Genevieve G Mount, Phillip Q Spinks
Accurate time-calibrated phylogenies are the centerpiece of many macroevolutionary studies, and the relationship between the size and scale of molecular data sets and the density and accuracy of fossil calibrations is a key element of time tree studies. Here, we develop a target capture array specifically for living turtles, compare its efficiency to an ultraconserved element (UCE) dataset, and present a time-calibrated molecular phylogeny based on 539 nuclear loci sequenced from 26 species representing the breadth of living turtle diversity plus outgroups...
July 12, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28710653/mechanical-performance-of-cement-and-screw-retained-all-ceramic-single-crowns-on-dental-implants
#13
Matthias Obermeier, Oliver Ristow, Kurt Erdelt, Florian Beuer
OBJECTIVES: This in-vitro study was performed to compare the contact wear, fracture strength and failure mode of implant-supported all-ceramic single crowns manufactured with various fabrication and fixation concepts. MATERIALS AND METHODS: Fifty dental implants (Conelog Ø 4,3mm/L11mm, Camlog Biotechnologies AG) were embedded and treated with all-ceramic molar single-crowns. Three groups received hand-layered zirconia crowns (IPS e.max Ceram/ IPS e.max ZirCAD, Ivoclar Vivadent AG): CZL (cement-retained zirconia-based layered) group crowns were cemented conventionally, SZL (screw-retained zirconia-based layered) group crowns were screw-retained, MZL (modified zirconia-based layered) group crowns showed a different coping design with screw retention...
July 15, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28709677/functional-and-esthetic-restorative-treatment-with-preheated-resins-in-a-patient-with-ectodermic-dysplasia-a-clinical-report
#14
José M Olivares, Alonso Hidalgo, Juan P Pavez, Dafna Benadof, Roberto Irribarra
Ectodermal dysplasia is a heterogeneous genetic condition affecting 1.6 to 22 per 100000 people. Oral manifestations associated with this condition include hyperdontia, hypodontia, microdontia, and conical teeth. Traditional treatment consists of a combination of orthodontic and rehabilitation therapies. The initial treatment stage uses removable prostheses and interim crowns for long periods, thus increasing risks for developing secondary caries. This clinical report describes the use of direct composite resin bonding with preheated compactable resins applied to vacuum-formed trays filled with clear silicone...
July 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28708924/bone-and-soft-tissue-response-in-bone-level-implants-restored-with-platform-switching-a-5-year-clinical-prospective-study
#15
Laura Lago, Luis da Silva, Francisco Gude, Benito Rilo
PURPOSE: The aim of this prospective study was to evaluate radiographic levels of peri-implant bone crest as well as soft tissue response, papilla height, and buccal mucosa recession, in bone-level implants restored with platform switching after 1-year and 5-year follow-ups. MATERIALS AND METHODS: This prospective study called for the placement of 59 implants to obtain a target of 90% power. To compensate for possible dropouts, the sample size was adjusted to 67 implants...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28708909/biomechanical-three-dimensional-finite-element-analysis-of-single-implant-supported-prostheses-in-the-anterior-maxilla-with-different-surgical-techniques-and-implant-types
#16
Fellippo Ramos Verri, Joel Ferreira Santiago, Daniel Augusto Almeida, Victor Eduardo de Souza Batista, Cleidiel Aparecido Araujo Lemos, Caroline Cantieri Mello, Eduardo Piza Pellizzer
PURPOSE: The aim of this study was to use three-dimensional finite element analysis to analyze the stress distribution transferred by single implant-supported prostheses placed in the anterior maxilla using different connections (external hexagon, internal hexagon, or Morse taper), inclinations of the load (0, 30, or 60 degrees), and surgical techniques for placement (monocortical/conventional, bicortical, or bicortical with nasal floor elevation). MATERIALS AND METHODS: Nine models representing a bone block of this region were simulated by computer-aided design software (InVesalius, Rhinoceros, SolidWorks)...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28708461/effects-of-four-different-crown-materials-on-the-peri-implant-clinical-parameters-and-composition-of-peri-implant-crevicular-fluid
#17
Shu-Juan Yu, Wen-Ling Shan, Yu-Xiao Liu, Xiao-Yan Huang, Guo-Xiong Zhu
This study aimed to identify the preferred crown material by measuring the peri-implant clinical parameters and the concentrations of receptor activator of nuclear factor-κB ligand (RANKL), osteoprotegerin (OPG), and calcium in peri-implant crevicular fluid (PICF) with four different crown materials. A total of 196 patients with a single missing posterior tooth received crown restoration with cobalt-chromium (Co-Cr) porcelain-fused-to-metal (PFM) (n=50), aurum platinum (Au-Pt) PFM (n=48), titanium (Ti) PFM (n=52), or zirconia (Zi) all-ceramic crown (n=46)...
July 14, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28707582/the-modulation-of-micrornas-in-tooth-root-development
#18
Ran Zhang, Tiejun Li
Tooth root development begins after the completion of tooth crown development, both of them undergo a series of interactions between epithelium and the adjacent mesenchymal cells. In contrast to the study in tooth crown formation, little is known about the regulatory mechanisms of tooth root development. MicroRNAs (miRNAs) are small non-coding RNAs that regulate protein expression through post-transcriptional mechanisms. They participate in a broad aspect of biological processes from the control of development to tumorigenesis...
July 13, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28707524/applicability-of-cameriere-s-and-drusini-s-age-estimation-methods-to-a-sample-of-turkish-adults
#19
Hatice Boyacioglu Dogru, Nihal Avcu, Nursel Akkaya, Humeyra Ozge Yilanci, Dincer Goksuluk
OBJECTIVES: The aim of this study was to investigate the applicability of Drusini's and Cameriere's methods to a sample of Turkish people. METHODS: Panoramic images of 200 individuals were allocated into two groups as study and test groups and examined by two observers. Tooth coronal indexes (TCI), which is the ratio between coronal pulp cavity height and crown height, were calculated in the mandibular first and second premolars and molars. Pulp/tooth area ratios (ARs) were calculated in the maxillary and mandibular canine teeth...
July 14, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28706791/a-novel-approach-for-restoration-of-hemisected-mandibular-first-molar-with-immediately-loaded-single-piece-bcs-implant-a-case-report
#20
Mahender Singh, Ranmeet Batra, Debdutta Das, Shweta Verma, Munish Goel
Mandibular first molars are the major standpoint for occlusion, and also have a wide peri-cemental area. Under specific conditions, hemisection of the tooth is indicated after an endodontic treatment. The following case report presents the hemisection of grossly carious, endodontically treated mandibular first molar, in a 23 year old female, followed by replacement of the mesial root with a single piece immediate loaded BCS (Bi-Cortical Screw) implant and a single unit porcelain fused to metal crown for the prosthetic rehabilitation of the remaining tooth structure, with the BCS implant providing strength and support to the weakened tooth structure...
May 2017: Journal of Oral Biology and Craniofacial Research
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