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https://www.readbyqxmd.com/read/28081288/short-dental-implants-6-mm-versus-long-dental-implants-11-15-mm-in-combination-with-sinus-floor-elevation-procedures-3-year-results-from-a-multi-center-randomized-controlled-clinical-trial
#1
Veronika Pohl, Daniel S Thoma, Katarzyna Sporniak-Tutak, Abel Garcia-Garcia, Thomas D Taylor, Robert Haas, Christoph H F Hämmerle
AIM: To test whether or not the use of short dental implants (6 mm) results in an implant survival rate similar to that with longer implants (11-15 mm) in combination with sinus grafting. METHODS: This multi-center study enrolled 101 patients with partial edentulism in the posterior maxilla and a remaining bone height of 5-7 mm. Included patients were randomly assigned to receive short implants (6 mm; GS / group short) or long implants (11-15 mm) simultaneously with sinus grafting (GG / group graft)...
January 12, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28080293/proximal-contact-repair-of-complex-amalgam-restorations
#2
M N Zguri, J A Casey, J P Jessup, K S Vandewalle
The carving of a complex amalgam restoration may occasionally result in light proximal contact with the adjacent tooth. The purpose of this study was to investigate the strength of complex amalgam restorations repaired with a proximal slot amalgam preparation. Extracted human third molars of similar coronal size were sectioned 1 mm apical to the height of the contour using a saw and were randomly distributed into 9 groups of 10 teeth each. One pin was placed at each line angle of the flattened dentinal tooth surface...
January 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28079941/changes-to-cretaceous-surface-fire-behaviour-influenced-the-spread-of-the-early-angiosperms
#3
Claire M Belcher, Victoria A Hudspith
Angiosperms evolved and diversified during the Cretaceous period. Early angiosperms were short-stature weedy plants thought to have increased fire frequency and mortality in gymnosperm forest, aiding their own expansion. However, no explorations have considered whether the range of novel fuel types that diversified throughout the Cretaceous also altered fire behaviour, which should link more strongly to mortality than fire frequency alone. We measured ignitability and heat of combustion in analogue Cretaceous understorey fuels (conifer litter, ferns, weedy and shrubby angiosperms) and used these data to model palaeofire behaviour...
February 2017: New Phytologist
https://www.readbyqxmd.com/read/28078758/periconceptional-maternal-high-fish-and-olive-oil-low-meat-dietary-pattern-is-associated-with-increased-embryonic-growth-the-rotterdam-periconceptional-cohort-predict-study
#4
Francesca Parisi, Melek Rousian, Nicole A Huijgen, Anton H J Koning, Sten P Willemsen, Jeanne H M de Vries, Irene Cetin, Eric A P Steegers, Régine P M Steegers-Theunissen
OBJECTIVE: To investigate associations between periconceptional maternal dietary patterns and first trimester embryonic growth. METHODS: 228 women with singleton ongoing pregnancies were enrolled in a prospective periconceptional cohort study, comprising of 135 strictly dated spontaneous pregnancies and 93 pregnancies achieved after in vitro fertilization or intracytoplasmatic sperm injection (IVF/ICSI pregnancies). All women underwent longitudinal transvaginal three-dimensional ultrasound (3D-US) scans from 6(+0) up to 13(+0) weeks of gestation...
January 12, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28076661/impression-techniques-used-for-single-unit-crowns-findings-from-the-national-dental-practice-based-research-network
#5
Michael S McCracken, David R Louis, Mark S Litaker, Helena M Minyé, Thomas Oates, Valeria V Gordan, Don G Marshall, Cyril Meyerowitz, Gregg H Gilbert
PURPOSE: To: (1) determine which impression and gingival displacement techniques practitioners use for single-unit crowns on natural teeth; and (2) test whether certain dentist and practice characteristics are significantly associated with the use of these techniques. MATERIALS AND METHODS: Dentists participating in the National Dental Practice-Based Research Network were eligible for this survey study. The study used a questionnaire developed by clinicians, statisticians, laboratory technicians, and survey experts...
January 11, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28075505/terminal-uranium-v-vi-nitride-activation-of-carbon-dioxide-and-disulfide-factors-governing-diverse-and-well-defined-cleavage-and-redox-reactions
#6
Stephen Liddle, Peter Cleaves, Christos Kefalidis, Benedict Gardner, Floriana Tuna, Eric McInnes, William Lewis, Laurent Maron
We report the reactivity of terminal uranium(V/VI)-nitrides with CE2 (E = O, S), where we observe well-defined C=E cleavage followed by zero-, one-, and two-electron redox events. The uranium(V)-nitride [U(TrenTIPS)(N)][K(B15C5)2] [1, TrenTIPS = N(CH2CH2NSiPri3)3; B15C5 = benzo-15-crown-5] reacts with CO2 to give [U(TrenTIPS)(O)(NCO)][K(B15C5)2] (3), whereas the uranium(VI)-nitride [U(TrenTIPS)(N)] (2) reacts with CO2 to give isolable [U(TrenTIPS)(O)(NCO)] (4); complex 4 rapidly decomposes to known [U(TrenTIPS)(O)] (5) with concomitant formation of N2 and CO proposed, with the latter trapped as a vanadocene adduct...
January 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28075073/resolving-the-relationships-of-paleocene-placental-mammals
#7
Thomas J D Halliday, Paul Upchurch, Anjali Goswami
The 'Age of Mammals' began in the Paleocene epoch, the 10 million year interval immediately following the Cretaceous-Palaeogene mass extinction. The apparently rapid shift in mammalian ecomorphs from small, largely insectivorous forms to many small-to-large-bodied, diverse taxa has driven a hypothesis that the end-Cretaceous heralded an adaptive radiation in placental mammal evolution. However, the affinities of most Paleocene mammals have remained unresolved, despite significant advances in understanding the relationships of the extant orders, hindering efforts to reconstruct robustly the origin and early evolution of placental mammals...
February 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28075026/updating-histological-data-on-crown-initiation-and-crown-completion-ages-in-southern-africans
#8
Donald J Reid, Debbie Guatelli-Steinberg
OBJECTIVES: To update histological data on crown initiation and completion ages in southern Africans. To evaluate implications of these data for studies that: (a) rely on these data to time linear enamel hypoplasias (LEHs), or, (b) use these data for comparison to fossil hominins. MATERIALS AND METHODS: Initiation ages were calculated on 67 histological sections from southern Africans, with sample sizes ranging from one to 11 per tooth type. Crown completion ages for southern Africans were calculated in two ways...
January 11, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28074260/accuracy-and-reproducibility-of-measurements-on-plaster-models-and-digital-models-created-using-an-intraoral-scanner
#9
Leonardo Tavares Camardella, Hero Breuning, Oswaldo de Vasconcellos Vilella
AIM: The purpose of the present study was to evaluate the accuracy and reproducibility of measurements made on digital models created using an intraoral color scanner compared to measurements on dental plaster models. METHODS: This study included impressions of 28 volunteers. Alginate impressions were used to make plaster models, and each volunteers' dentition was scanned with a TRIOS Color intraoral scanner. Two examiners performed measurements on the plaster models using a digital caliper and measured the digital models using Ortho Analyzer software...
January 10, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28073636/prognosis-of-double-crown-retained-removable-dental-prostheses-compared-with-clasp-retained-removable-dental-prostheses-a-retrospective-study
#10
Keita Ishida, Toshifumi Nogawa, Yoshiyuki Takayama, Masayasu Saito, Atsuro Yokoyama
PURPOSE: The present study compared the clinical prognosis of double crown-retained removable dental prostheses (D-DRPs) with that of clasp-retained removable dental prostheses (C-RDPs). METHODS: Clinical records of 201 patients who had received 52 D-RDPs with 144 abutment teeth (D-teeth) and 199 C-RDPs with 399 abutment teeth (C-teeth) at the Prosthetic Dentistry Clinic in Hokkaido University Hospital between April 2005 and June 2015 were analyzed. Survival and complication probabilities of the two types of prostheses and abutment teeth were evaluated using the Kaplan-Meier method and compared using the log-rank test...
January 7, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28072987/-a-pilot-clinical-study-of-immediate-provisionalization-with-a-chairside-computer-aided-design-and-computer-aided-manufacture-monolithic-crown-for-single-tooth-immediate-implant-placement
#11
J H Tian, P Di, Y Lin, Y Zhang, D H Wei, H Y Cui
Objective: To evaluate the primary clinical outcomes of immediate provisionalization with a monolithic crown utilizing a novel chairside computer aided design and computer aided manufacture (CAD/CAM) workflow for single tooth immediate implant placement. Methods: This pilot study was a prospective within-subjects design. Thirteen consecutive patients were included and diagnosed with untreatable single incisor or premolar with fine general and local anatomical conditions. The trial was conducted at Department of Implantology, Peking University School and Hospital of Stomatology, Beijing, between January 2016 and June 2016...
January 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28071902/reversible-single-crystal-to-single-crystal-transformation-and-magnetic-change-of-nonporous-copper-ii-complexes-by-the-chemisorption-desorption-of-hcl-and-h2o
#12
Li-Zhen Cai, Xiao-Ming Jiang, Zhang-Jing Zhang, Pei-Yu Guo, Ai-Ping Jin, Ming-Sheng Wang, Guo-Cong Guo
Vapor-responsive magnetic materials are highly promising for applications as chemical switches or sensors. Compared with porous materials, nonporous species benefit in overcoming the intrinsic conflict between magnetic exchange and porosity but usually suffer from the powdering of single crystals, which hinders the understanding of the structural nature of vapor response and magnetic switch. Single-crystal-to-single-crystal (SCSC) transformation of nonporous compounds through the desorption/absorption of gaseous HCl is unprecedented...
January 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28070700/clouds-homogenize-shoot-temperatures-transpiration-and-photosynthesis-within-crowns-of-abies-fraseri-pursh-poiret
#13
J Melissa Hernandez-Moreno, Nicole M Bayeur, Harold D Coley, Nicole M Hughes
Multiple studies have examined the effects of clouds on shoot and canopy-level microclimate and physiological processes; none have yet done so on the scale of individual plant crowns. We compared incident photosynthetically active radiation (PAR), leaf temperatures, chlorophyll fluorescence, and photosynthetic gas exchange of shoots in three different spatial locations of Abies fraseri crowns on sunny (clear to partly cloudy) versus overcast days. The field site was a Fraser fir farm (1038 m elevation) in the Appalachian mountains, USA...
January 10, 2017: Oecologia
https://www.readbyqxmd.com/read/28070574/half-sandwich-lanthanide-crown-ether-complexes-with-the-slow-relaxation-of-magnetization-and-photoluminescence-behaviors
#14
Feng Gao, Feng-Lei Yang, Xiaowan Feng, Huimin Xu, Wang Sun, Huan Liu, Xiu-Ling Li
Four half-sandwich type mononuclear lanthanide crown ether complexes with the formula [Ln(12-crown-4)(NO3)3] (Ln(3+) = Dy(3+) (1), Tb(3+) (2), Ho(3+) (3), and Er(3+) (4); 12-crown-4 = 1,4,7,10-tetraoxacyclododecane) were successfully synthesized and structurally characterized. Ac magnetic susceptibility measurements reveal that dysprosium complex 1 behaves as a typical single-ion magnet, while solid state photoluminescence studies show that complexes 1 and 2 have the respective lanthanide(iii) luminescence characteristics...
January 10, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28069173/periconceptional-maternal-biomarkers-of-one-carbon%C3%A2-metabolism-and-embryonic-growth-trajectories-the-rotterdam-periconceptional-cohort-predict-study
#15
Francesca Parisi, Melek Rousian, Anton H J Koning, Sten P Willemsen, Irene Cetin, Eric A P Steegers, Régine P M Steegers-Theunissen
OBJECTIVE: To study the associations between the periconceptional maternal biomarkers of one-carbon metabolism and embryonic growth. DESIGN: Prospective, periconceptional hospital-based birth cohort. SETTING: Tertiary medical care center. PATIENT(S): Between 2010 and 2014, 236 women with early singleton ongoing pregnancies that resulted in 139 strictly dated spontaneous pregnancies and 97 pregnancies conceived after assisted reproductive technology...
January 6, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28066993/developing-a-biomimetic-tooth-bud-model
#16
Elizabeth E Smith, Weibo Zhang, Nathan R Schiele, Ali Khademhosseini, Catherine K Kuo, Pamela C Yelick
A long-term goal is to bioengineer, fully functional, living teeth for regenerative medicine and dentistry applications. Biologically based replacement teeth would avoid insufficiencies of the currently used dental implants. Using natural tooth development as a guide, a model was fabricated using post-natal porcine dental epithelial (pDE), porcine dental mesenchymal (pDM) progenitor cells, and human umbilical vein endothelial cells (HUVEC) encapsulated within gelatin methacrylate (GelMA) hydrogels. Previous publications have shown that post-natal DE and DM cells seeded onto synthetic scaffolds exhibited mineralized tooth crowns composed of dentin and enamel...
January 8, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28066951/a-divalent-pentastable-redox-switchable-donor-acceptor-rotaxane
#17
Hendrik V Schröder, Henrik Hupatz, Andreas J Achazi, Sebastian Sobottka, Biprajit Sarkar, Beate Paulus, Christoph A Schalley
Donor-acceptor materials with small HOMO-LUMO gaps are important in molecular electronics, but often difficult to synthesise. A simple and efficient way to position tetrathiafulvalene (TTF) as the donor and naphthalene diamide (NDI) as the acceptor in close proximity to each other in a divalent crown/ammonium pseudo[2]rotaxane is presented. The divalent design provides high chelate cooperativity and much stronger binding compared to a monovalent analogue. The pseudo[2]rotaxane is then doubly interlocked by stoppering it in a catalyst-free 1,3-dipolar cycloaddition...
January 9, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28065967/influence-of-trace-elements-on-dental-enamel-properties-a-review
#18
Zeeshan Qamar, Zubaidah Binti Haji Abdul Rahim, Hooi Pin Chew, Tayyaba Fatima
Dental enamel, an avascular, irreparable, outermost and protective layer of the human clinical crown has a potential to withstand the physico-chemical effects and forces. These properties are being regulated by a unique association among elements occurring in the crystallites setup of human dental enamel. Calcium and phosphate are the major components (hydroxyapatite) in addition to some trace elements which have a profound effect on enamel. The current review was planned to determine the aptitude of various trace elements to substitute and their influence on human dental enamel in terms of physical and chemical properties...
January 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28063263/three-dimensional-ultrasound-first-trimester-fetal-volume-measurement-and-its-relation-to-pregnancy-outcome
#19
Haitham A Torky, Asem A Moussa, Ali M Ahmad, Osama Dief, Manar A Eldesoouky, Ahmed S El-Gayed
AIM OF WORK: To determine whether fetal volume (FV) measured by three-dimensional (3D) ultrasound was able to detect fetuses at risk of low birth weight (primary outcome) and/or preterm labor (secondary outcome). METHODS: One hundred pregnant women carrying a singleton living pregnancy who were sure of dates, and had a dating scan, with gestational age between 11 weeks and 13 weeks+6 days coming for routine first trimester nuchal translucency (NT) were examined by both two-dimensional (2D) and 3D ultrasound (Vocal System) for crown-rump length (CRL) and FV then followed up regularly every 4 weeks until 28 weeks then biweekly until 36 weeks then weekly until delivery both clinically and by ultrasound biometry...
January 7, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28062907/prediction-of-fetal-loss-by-first-trimester-crown-rump-length-in-ivf-pregnancies
#20
Rinat Gabbay-Benziv, Amir Dolev, Ron Bardin, Israel Meizner, Benjamin Fisch, Avi Ben-Haroush
OBJECTIVE: To evaluate the association between small crown-rump length (CRL) and fetal loss ≤22 weeks in IVF pregnancies. METHODS: A retrospective analysis of prospectively collected data at a university-affiliated medical center. All singleton IVF pregnancies within a 5-year period, with a live embryo on first-trimester ultrasound and verified pregnancy outcome were included. Rates of fetal loss ≤22 weeks were compared between pregnancies with a CRL ≤tenth percentile and above the tenth percentile of our population...
January 7, 2017: Archives of Gynecology and Obstetrics
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