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https://www.readbyqxmd.com/read/28231638/comparison-of-the-shock-absorption-capacities-of-different-mouthguards
#1
Melina Simonetta Bochnig, Min-Jung Oh, Theresa Nagel, Fred Ziegler, Paul-Georg Jost-Brinkmann
BACKGROUND/AIMS: In this in vitro study the protective qualities of different mouthguard types were examined during small hard object collisions. The aim was to investigate inconclusive aspects of hard inserts, nylon nets and air spaces as reinforcements in the anterior region and the protection qualities of ethylene vinyl acetate (EVA). MATERIALS AND METHODS: Five different mouthguards with a labial thickness between 2 mm and 11 mm made of materials of varying stiffness were investigated...
February 23, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28228628/effects-of-taper-and-space-settings-of-telescopic-ce-tzp-a-crowns-on-retentive-force-and-settling
#2
Shusuke Nakagawa, Katsunori Torii, Masahiro Tanaka
The aim of this study was to investigate the effect of the taper and space setting of using Ce-TZP/A on retentive force and secondary crown settling. The taper were 2°, 4°, and 6°, and the space settings were 0 and 10 μm. The applied loads were 50 and 100 N. The taper had a significant effect on retentive force and settling at both loads (p<0.05). The space settings did not have a significant effect on retentive force or settling at either load (p<0.05). The taper of the telescopic crowns and the load affected the retentive force and the settling...
February 22, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28224848/nursingstandard-com
#3
(no author information available yet)
1. A senior staff nurse who gave a patient who later died the wrong type of blood has been given a suspended prison sentence. Lea Ledesma, who worked at the Heart Hospital in London's Westmoreland Street, was found guilty of unlawfully killing Ali Huseyin by gross negligence at Southwark Crown Court. Read more: rcni.com/court-nurse.
February 22, 2017: Nursing Standard
https://www.readbyqxmd.com/read/28224151/counterion-induced-crystallization-of-intermetalloid-matryoshka-clusters-sb-pd12-sb20-3-4
#4
Zhenyu Li, Huapeng Ruan, Lulu Wang, Caiping Liu, Li Xu
Two intermetalloid Matryoshka cluster anions [Sb@Pd12@Sb20](3-,4-) obtained from the reaction of KSb and Pd(PPh3)4 were isolated as [K(2,2,2-cryptand)](+) and [K(18-crown-6)](+) salt, respectively, and characterized by X-ray crystallography, EPR measurement and DFT theoretical calculations.
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28222879/evaluation-of-die-trim-morphology-made-by-cad-cam%C3%A2-technology
#5
Pratiksha Agrawal, Geoffrey Thompson, Seok-Hwan Cho, Gerald J Ziebert
STATEMENT OF PROBLEM: The die contour can affect the emergence profile of prosthetic restorations. However, little information is available regarding the congruency between a stereolithographic (SLA) die and its corresponding natural tooth. PURPOSE: The purpose of this vitro study was to evaluate the shapes of SLA die in comparison with the subgingival contour of a prepared tooth to be restored with a ceramic crown. MATERIAL AND METHODS: Twenty extracted human teeth, 10 incisors, and 10 molars, were disinfected and mounted in a typodont model...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222877/fracture-of-layered-zirconia-restorations-at-5-years-a-dental-laboratory-survey
#6
Aous A Abdulmajeed, Terence E Donovan, Lyndon F Cooper, Ricardo Walter, Taiseer A Sulaiman
STATEMENT OF PROBLEM: The use of ceramic restorations has significantly increased in recent years because of their esthetic properties and the high cost of noble metals. However, given the lack of long-term clinical trials and the limitations of in vitro studies, the durability of ceramic restorations is still questionable. PURPOSE: The purpose of this retrospective study was to determine the fracture rate of layered zirconia restorations at up to 5 years of clinical performance by using a dental laboratory survey model...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222876/evaluation-of-the-effect-of-an-offset-implant-configuration-in-the-posterior-maxilla-with-external-hexagon-implant-platform-a-3-dimensional-finite-element-analysis
#7
Victor Eduardo de Souza Batista, Fellippo Ramos Verri, Daniel Augusto de Faria Almeida, Joel Ferreira Santiago Junior, Cleidiel Aparecido Araújo Lemos, Eduardo Piza Pellizzer
STATEMENT OF PROBLEM: Slight displacement of the central implant in 3-unit implant-supported prostheses has been reported to improve biomechanical behavior. However, studies that assessed the effects of an offset implant configuration in the posterior maxilla are scarce. PURPOSE: The purpose of this 3-dimensional (3D) finite element analysis was to assess the effects of splinting in 3-unit implant-supported prostheses with varying implant positions (straight-line or offset configuration) in terms of the stress/strain distribution on bone tissue and the stress distribution on abutment screws...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222873/influence-of-abutment-tooth-geometry-on-the-accuracy-of%C3%A2-conventional-and-digital-methods-of-obtaining-dental%C3%A2-impressions
#8
Jeison B Carbajal Mejía, Kazumichi Wakabayashi, Takashi Nakamura, Hirofumi Yatani
STATEMENT OF PROBLEM: Direct (intraoral) and indirect (desktop) digital scanning can record abutment tooth preparations despite their geometry. However, little peer-reviewed information is available regarding the influence of abutment tooth geometry on the accuracy of digital methods of obtaining dental impressions. PURPOSE: The purpose of this in vitro study was to evaluate the influence of abutment tooth geometry on the accuracy of conventional and digital methods of obtaining dental impressions in terms of trueness and precision...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222872/clinical-marginal-fit-of-zirconia-crowns-and-patients-preferences-for-impression-techniques-using-intraoral-digital-scanner-versus-polyvinyl-siloxane-material
#9
Nawapat Sakornwimon, Chalermpol Leevailoj
STATEMENT OF PROBLEM: The use of digital intraoral scanners is increasing; however, evidence of its precision in making crown impressions clinically remains scarce. Patients should also feel more comfortable with digital impressions, but only a few studies evaluating this subject have been performed. PURPOSE: The purpose of this clinical study was to evaluate the marginal fit of monolithic zirconia crowns and patients' preferences for digital impressions versus polyvinyl siloxane (PVS) impressions...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222871/evaluation-of-hypersensitivity-after-the-placement-of-metal-ceramic-crowns-cemented-with-two-luting-agents-long-term-results-of-a-prospective-clinical-study
#10
Carla Kozmacs, Katharina Schaper, Hans-Christoph Lauer, Andree Piwowarczyk
STATEMENT OF PROBLEM: Different luting materials are available for the cementation of fixed dental prostheses. Postcementation hypersensitivity is an occasional complication in the definitive delivery. How the choice of luting agent affects long-term postcementation sensitivity is unknown. PURPOSE: The purpose of this prospective, randomized, controlled, split-mouth clinical trial was to compare the hypersensitivity of 2 cementation methods for metal ceramic crowns...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28220366/zirconia-implants-and-peek-restorations-for-the-replacement-of-upper-molars
#11
José María Parmigiani-Izquierdo, María Eugenia Cabaña-Muñoz, José Joaquín Merino, Arturo Sánchez-Pérez
BACKGROUND: One of the disadvantages of the zirconia implants is the lack of elasticity, which is increased with the use of ceramic or zirconia crowns. The consequences that could result from this lack of elasticity have led to the search for new materials with improved mechanical properties. CASE PRESENTATION: A patient who is a 45-year-old woman, non-smoker and has no medical record of interest with a longitudinal fracture in the palatal root of molar tooth 1...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28218399/smooth-operator-the-effects-of-different-3d-mesh-retriangulation-protocols-on-the-computation-of-dirichlet-normal-energy
#12
Jackson P Spradley, James D Pampush, Paul E Morse, Richard F Kay
OBJECTIVES: Dirichlet normal energy (DNE) is a metric of surface topography that has been used to evaluate the relationship between the surface complexity of primate cheek teeth and dietary categories. This study examines the effects of different 3D mesh retriangulation protocols on DNE. We examine how different protocols influence the DNE of a simple geometric shape-a hemisphere-to gain a more thorough understanding than can be achieved by investigating a complex biological surface such as a tooth crown...
February 20, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28218325/competition-between-excluded-volume-and-electrostatic-interactions-for-nanogel-swelling-effects-of-the-counterion-valence-and-nanogel-charge
#13
Irene Adroher-Benítez, Alberto Martín-Molina, Silvia Ahualli, Manuel Quesada-Pérez, Gerardo Odriozola, Arturo Moncho-Jordá
In this work the equilibrium distribution of ions around a thermo-responsive charged nanogel particle in an electrolyte aqueous suspension is explored using coarse-grained Monte Carlo computer simulations and the Ornstein-Zernike integral equation theory. We explicitly consider the ionic size in both methods and study the interplay between electrostatic and excluded-volume effects for swollen and shrunken nanogels, monovalent and trivalent counterions, and for two different nanogel charges. We find good quantitative agreement between the ionic density profiles obtained using both methods when the excluded repulsive force exerted by the cross-linked polymer network is taken into account...
February 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28217883/clinical-and-radiographic-outcome-following-immediate-loading-and-delayed-loading-of-single-tooth-implants-randomized-clinical-trial
#14
Björn Gjelvold, Jenö Kisch, Bruno Ramos Chrcanovic, Tomas Albrektsson, Ann Wennerberg
BACKGROUND: Immediate loading of single implants is generally considered a reliable procedure. PURPOSE: The objective of the present prospective randomized clinical study was to compare the overall treatment outcome following immediate loading (IL) and delayed loading (DL) of single implants after 1 year of follow-up. MATERIALS AND METHODS: Patients with a missing maxillary tooth (15-25) were randomly assigned to IL or DL. The protocol included implant installation in healed sites, immediate loading, delayed loading, temporary screw-retained restoration, and replacement with a permanent single implant crown...
February 19, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28217840/a-comparison-of-us-and-japanese-dental-restorative-care-present-on-service-members-recovered-from-the-wwii-era
#15
Calvin Y Shiroma
The documentation of dental materials used in the USA during the WWII era is readily available, while references for the Japanese are minimal. It was therefore important to build a photographic database of Japanese restorative care which could be utilized as a comparison tool for the deployed odontologist. The dental restorative care of approximately 400 US and 100 Japanese sets of remains was evaluated. Both countries share many similar restorative techniques to include collared crowns, full-coverage restorations, cantilever bridge/pontics to close spaces; restorative materials such as amalgam, gold, and zinc phosphate (temporary) restorations; and removable prostheses...
February 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28217324/crystal-structure-of-22-24-25-trimethyl-8-11-14-trioxa-25-aza-tetra-cyclo-19-3-1-0-2-7-0-15-20-penta-cosa-2-4-6-15-20-16-18-hexaen-23-one
#16
Van Tuyen Nguyen, Hong Hieu Truong, Tuan Anh Le, Anatoly T Soldatenkov, Tuyet Anh Dang Thi, Thi Thanh Van Tran, Natalia Ya Esina, Victor N Khrustalev
The title compound, C24H29NO4, is the product of a Petrenko-Kritchenko condensation of 1,5-bis-(2-formyl-phen-oxy)-3-oxa-pentane, pentan-3-one and methyl-ammonium acetate in ethanol. The mol-ecule has mirror symmetry. The aza-14-crown-3 ether ring adopts a bowl conformation stabilized by a weak intra-molecular C-H⋯O hydrogen bond. The conformation of the C-O-C-C-O-C-C-O-C polyether chain is t-g(+)-t-t-g(-)-t (t = trans, 180°; g = gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72...
February 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28216852/a-simplified-approach-to-rehabilitate-an-ocular-defect-ocular-prosthesis
#17
Darshana Choubisa
A 42-year-old male patient complaint with missing right eye was referred to the Department of Prosthodontics and Crown and Bridge. This patient was seeking artificial eye replacement. On careful clinical examination, a defect with a shrunken orbit and intact tissue bed was found in the patient. As the patient was economically very poor, modified stock ocular prosthesis was advised. To rehabilitate this ocular defect, "single" appointment technique with clinically available material was adopted, which is discussed in the present communication...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216846/three-dimensional-finite-element-analysis-of-the-stress-distribution-pattern-in-a-mandibular-first-molar-tooth-restored-with-five-different-restorative-materials
#18
Kathleen Manuela D'souza, Meena Ajay Aras
INTRODUCTION: Badly broken or structurally compromised posterior teeth are frequently associated with crown/root fracture. Numerous restorative materials have been used to fabricate indirect full-coverage restorations for such teeth. This study aims to evaluate and compare the effect of restorative materials on the stress distribution pattern in a mandibular first molar tooth, under varying loading conditions and to compare the stress distribution pattern in five commonly used indirect restorative materials...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28215951/crowned-dens-syndrome
#19
Kiyoshi Shikino, Takahiro Ota, Masatomi Ikusaka
No abstract text is available yet for this article.
March 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28214537/biomechanical-behavior-of-endodontically-treated-premolars-using-different-preparation-designs-and-cad-cam-materials
#20
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Thaís Yumi Umeda Suzuki, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVES: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2...
February 15, 2017: Journal of Dentistry
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