Results 181 to 190 of about 2,258 (233)
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The crown lengthening double guide and the digital Perio analysis
Journal of Esthetic and Restorative Dentistry, 2022AbstractObjectiveThis article describes a surgical crown lengthening double guide, which was digitally obtained to improve diagnosis, treatment outcome, and follow‐up.Clinical considerationsThe rehabilitation of anterior dental esthetics should involve interdisciplinary and facially driven planning for achieving pleasant long‐term outcomes.
Christian Coachman +7 more
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Retention behavior of double-crown attachments with zirconia primary and secondary crowns
Dental Materials, 2016To investigate whether adequate retention of zirconia conical crown (CC) attachments can be achieved, and to investigate their long-term retention.Sixteen individual zirconia primary crowns were produced with convergence angles of 1° or 2° (eight of each).
Franz Sebastian, Schwindling +4 more
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Wear behavior of different double-crown systems
Clinical Oral Investigations, 2012The aim of this study was to evaluate aging effects on the retentive forces (RFs) of different double-crown systems. The effects of abutment height, inner- and outer-crown-material, taper angle, and artificial aging were analyzed.Inner (IC) and outer crowns (OC) (240), divided into four groups, 60 specimens each, were manufactured: A: IC = zirconia, OC
Jörg, Engels +7 more
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Gold‐Doping of Double‐Crown Pd Nanoclusters
Chemistry – A European Journal, 2017AbstractDouble‐crown Ni, Pd, or Pt nanoclusters have attracted extensive interests due to their aesthetic structure and intriguing properties. However, their doping by other metals remains unknown until now. Herein, Pd4(PET)8 and Pd5(PET)10 (PET: SCH2CH2Ph) were successfully doped with gold and the doped nanoclusters were characterized by using ...
Jishi Chen +7 more
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Double-armed crown ethers for calcium optical sensors
Talanta, 2009This paper presents the characterization of optical sensing membranes for calcium based on ionophore-chromoionophore chemistry. Six different ionophores, 18-membered crown ether derivatives, were studied, coming from 18-crown-6 ether and 4,13-diaza-18-crown-6 ether to a series of double-armed crown ethers with different type of terminal groups.
S, Capel-Cuevas +3 more
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Crown ethers containing trans double bonds
Tetrahedron Letters, 1981Abstract The synthesis and spectroscopic properties of 18-crown-6-derivatives containing the E-α,β-dia1koxystilbene moiety as a ring member are described. These crown ethers are chiral but their complexing ability is drastically reduced as compared with the corresponding Z-isomers.
Andreas Merz +2 more
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THE DOUBLE BELT SYSTEM FOR TREE CROWN STABILIZATION
Arboricultural Journal, 1993Summary As tree crown failure along roadsides is an unacceptable hazard to both traffic and pedestrians, a new belt system for crown stabilization has been developed. The double belt “System Osnabruck” combines a stronger retaining belt, which carries the load and is linked to the bracing cable, and a weaker fastening belt, which is tightened loosely ...
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Reduction-resistant and reduction-catalytic double-crown nickel nanoclusters
Nanoscale, 2014Ni6(SCH2CH2Ph)12(Ni6) was synthesized using three different methods and fully characterized; importantly, the reduction-resistance and reduction-catalysis properties of Ni6 were revealed.
Min, Zhu +4 more
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