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Margin fit

Julian Conejo, Toyoaki Kobayashi, Evantia Anadioti, Markus B Blatz
AIMS: This review assessed the available evidence on the performance of CAD/CAM monolithic implant-supported restorations bonded to titanium (Ti) inserts and bases, which has become a popular concept. MATERIALS AND METHODS: An electronic and manual search of PubMed databases was conducted to identify studies published in English between 2000 and 2016 on the performance of monolithic ceramic implant restorations with Ti inserts. RESULTS: The initial search revealed 505 titles...
2017: European Journal of Oral Implantology
Joannis Katsoulis, Takuro Takeichi, Ana Sol Gaviria, Lukas Peter, Konstantinos Katsoulis
BACKGROUND AND AIM: Compromised fit between the contact surfaces of screw-retained implant-supported fixed dentures (IFDs) is thought to create uncontrolled strains in the prosthetic components and peri-implant tissues, thus evoking biological and technical complications such as bone loss, screw loosening, component fractures and, at worst, loss of implants or prostheses. The aim of this systematic review was to evaluate the impact of marginal misfit on the clinical outcomes of IFDs, and to elucidate definition and assessment methods for passive fit...
2017: European Journal of Oral Implantology
Emil Emmanuel C Estilo, Alonzo A Gabriel
This study was conducted to determine the effects of intrinsic juice characteristics namely insoluble solids (IS, 0-3 %w/v), and soluble solids (SS, 0-70 °Brix), and extrinsic process parameter treated volume (250-1000 mL) on the UV-C inactivation rates of heat-stressed Salmonella enterica in simulated fruit juices (SFJs). A Rotatable Central Composite Design of Experiment (CCRD) was used to determine combinations of the test variables, while Response Surface Methodology (RSM) was used to characterize and quantify the influences of the test variables on microbial inactivation...
February 2018: Food Microbiology
Carlos Eduardo Edwards Rezende, Ana Flávia Sanches Borges, Rander Moreira Macedo, José Henrique Rubo, Jason Alan Griggs
OBJECTIVE: To evaluate the dimensional changes from the sintering process of Y-TZP and relate them to the fit of zirconia copings. METHODS: The sintering shrinkage rate (SSR) was obtained from the measurement of geometric specimens (4×4×2mm). Thirty-six zirconia copings made using CAD/CAM were equally divided into three groups (n=12): ZMAX - IPS e.max ZirCAD (Ivoclar Vivadent, Liechtenstein); ZYZ - InCeram YZ (Vita Zahnfabrik, Germany); and ZK - Zirklein (Zirklein, Brazil)...
September 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
Thomas R Haaland, Jonathan Wright, Bram Kuijper, Irja I Ratikainen
Differential allocation (DA) is the adaptive adjustment of reproductive investment (up or down) according to partner quality. A lack of theoretical treatments has led to some confusion in the interpretation of DA in the empirical literature. We present a formal framework for DA that highlights the nature of reproductive benefits versus costs for females mated to males of different quality. Contrary to popular belief, analytical and stochastic dynamic models both show that additive benefits of male quality on offspring fitness have no effect on optimal levels of female investment and thus cannot produce DA...
October 2017: American Naturalist
Laura Pazzagli, Anna Möllsten, Ingeborg Waernbaum
PURPOSE: Diabetic nephropathy is a severe complication of type 1 diabetes (T1D) that may lead to renal failure and end-stage renal disease (ESRD) demanding dialysis and transplantation. The etiology of diabetic nephropathy is multifactorial and both genes and environmental and life style-related factors are involved. In this study, we investigate the effect of the socioeconomic exposures, unemployment and receiving income support, on the development of ESRD in T1D patients, using a marginal structural model (MSM) in comparison with standard logistic regression models...
August 2017: Annals of Epidemiology
Anja Liebermann, Stefan Frei, Madalena Lucia Pinheiro Dias Engler, Otto Zuhr, Otto Prandtner, Daniel Edelhoff, Reza Saeidi Pour
OBJECTIVE: Oral rehabilitation often requires a multidisciplinary approach including restorative dentistry, prosthodontics, and periodontology to fulfill high esthetic and functional demands, frequently combined with changes in the vertical dimension. The presence of gingival recessions can be associated with numerous factors, such as brushing or preparation trauma and persistent inflammation of the gingiva due to inadequate marginal fit of restorations. Because gingival recessions can cause major esthetic and functional problems, obtaining stability of the gingival tissue around prosthetic restorations is of essential concern...
September 19, 2017: Journal of Esthetic and Restorative Dentistry
Jinshuang Wu, Xianli Wang, Helin Xing, Tianwen Guo, Chaofang Dong, Sefei Yang
This study investigated the mechanical properties and single crown accuracy of the tailor-made Fourth University Stomatology investment (FUS-invest) for casting titanium. Background. Current investment for casting titanium is not optimal for obtaining high-quality castings, and the commercially available titanium investment is costly. Methods. Titanium specimens were cast using the tailor-made FUS-invest. The mechanical properties were tested using a universal testing machine. Fractured castings were characterized by energy-dispersive spectroscopy...
2017: BioMed Research International
Cyril Granier, Christophe Hausswirth, Sylvain Dorel, Le Meur Yann
PURPOSE: This study aimed to determine the validity and the reliability of the Stages power meter crank system (Boulder, United States) during several laboratory cycling tasks. METHODS: Eleven trained participants completed laboratory cycling trials on an indoor cycle fitted with SRM Professional and Stages systems. The trials consisted of an incremental test at 100W, 200W, 300W, 400W and four 7s sprints. The level of pedaling asymmetry was determined for each cycling intensity during a similar protocol completed on a Lode Excalibur Sport ergometer...
September 6, 2017: Journal of Strength and Conditioning Research
Fumi Mizuhashi, Kaoru Koide
BACKGROUND/AIMS: Fabrication of mouthguards should be performed properly. However, the appropriate heating temperature for fabricating a pressure-formed mouthguard has not been determined. The aim of this study was to examine the influence of the heating temperature on the fabrication of a pressure-formed mouthguard. MATERIALS AND METHODS: Mouthguard sheets of 3.8 mm ethylene vinyl acetate were pressure formed on a working model at three heating temperatures: 80°C, 100°C, and 120°C...
September 13, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Courtney Turrin, Nicholas A Fagan, Olga Dal Monte, Steve W C Chang
Optimality principles guide how animals adapt to changing environments. During foraging for nonsocial resources such as food and water, species across taxa obey a strategy that maximizes resource harvest rate. However, it remains unknown whether foraging for social resources also obeys such a strategic principle. We investigated how primates forage for social information conveyed by conspecific facial expressions using the framework of optimal foraging theory. We found that the canonical principle of Marginal Value Theorem (MVT) also applies to social resources...
September 12, 2017: Scientific Reports
Sridevi Jade, T S Shrungeshwara, Kireet Kumar, Pallabee Choudhury, Rakesh K Dumka, Harsh Bhu
We estimate a new angular velocity for the India plate and contemporary deformation rates in the plate interior and along its seismically active margins from Global Positioning System (GPS) measurements from 1996 to 2015 at 70 continuous and 3 episodic stations. A new India-ITRF2008 angular velocity is estimated from 30 GPS sites, which include stations from western and eastern regions of the plate interior that were unrepresented or only sparsely sampled in previous studies. Our newly estimated India-ITRF2008 Euler pole is located significantly closer to the plate with ~3% higher angular velocity than all previous estimates and thus predicts more rapid variations in rates and directions along the plate boundaries...
September 12, 2017: Scientific Reports
Oscar Oviedo-Trespalacios, Mark King, Md Mazharul Haque, Simon Washington
Distracted driving is one of the most significant human factor issues in transport safety. Mobile phone interactions while driving may involve a multitude of cognitive and physical resources that result in inferior driving performance and reduced safety margins. The current study investigates characteristics of usage, risk factors, compensatory strategies in use and characteristics of high-frequency offenders of mobile phone use while driving. A series of questions were administered to drivers in Queensland (Australia) using an on-line questionnaire...
2017: PloS One
Hakimeh Siadat, Elaheh Beyabanaki, Niloufar Mousavi, Marzieh Alikhasi
PURPOSE: This in vitro study aimed to evaluate the effect of implant connection design (external vs. internal) on the fit discrepancy and torque loss of zirconia and titanium abutments. MATERIALS AND METHODS: Two regular platform dental implants, one with external connection (Brånemark, Nobel Biocare AB) and the other with internal connection (Noble Replace, Nobel Biocare AB), were selected. Seven titanium and seven customized zirconia abutments were used for each connection design...
August 2017: Journal of Advanced Prosthodontics
Wan-Sun Lee, Du-Hyeong Lee, Kyu-Bok Lee
PURPOSE: This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method. MATERIALS AND METHODS: The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. After scanning the working model, the design software is used to design the crown. The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group...
August 2017: Journal of Advanced Prosthodontics
Fumi Mizuhashi, Kaoru Koide
BACKGROUND/AIM: Mouthguard thickness is important for the prevention from orofacial trauma during sports. However, it is difficult to maintain the necessary thickness after forming the mouthguard. The aim of this study was to evaluate a pressure-forming method using a single mouthguard sheet. MATERIALS AND METHODS: A mouthguard sheet of 3.8 mm ethylene vinyl acetate was prepared by cutting 3 mm from the anterior margin of the sheet holder with a length of 7 mm and with the width being from the buccal cusp of the upper right first premolar to the buccal cusp of the upper left first premolar, and compared with the original sheet...
September 5, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Jerry H Gurwitz, David J Magid, David H Smith, Grace H Tabada, Sue Hee Sung, Larry A Allen, David D McManus, Robert J Goldberg, Mayra Tisminetzky, Alan S Go
OBJECTIVES: To assess the clinical effectiveness of beta-blocker therapy in individuals with heart failure (HF) and chronic lung disease and of angiotensin-converting enzyme inhibitors (ACE-Is) and angiotensin II receptor blockers (ARBs) in individuals with HF and chronic kidney disease. DESIGN: Retrospective cohort study. SETTING: Community. PARTICIPANTS: Individuals with HF with reduced ejection fraction (HFrEF) or HF with preserved ejection fraction (HFpEF)...
September 5, 2017: Journal of the American Geriatrics Society
Luca Roncati, Teresa Pusiol, Francesco Piscioli
The latest reviews on thin melanoma (TM) continue to consider it a melanoma within 1 mm in thickness, but no consensus exists as to which patients with TM are at risk for lymph node metastases (1). Numerous studies have evaluated the impact of various predictors (Breslow thickness, Clark level, ulceration, regression, vascular invasion, mitotic activity, location, sex) for nodal disease in melanoma, but the conclusions have not been homogenous (2,3). For this reason, we read the paper by Homolak et al. with great interest, where the authors examine the sentinel lymph node biopsies (SLNB) of 184 patients affected by melanoma of thickness less than 1...
July 2017: Acta Dermatovenerologica Croatica: ADC
Peter F Thall, Moreno Ursino, Véronique Baudouin, Corinne Alberti, Sarah Zohar
A Bayesian methodology is proposed for constructing a parametric prior on two treatment effect parameters, based on graphical information elicited from a group of expert physicians. The motivating application is a 70-patient randomized trial to compare two treatments for idiopathic nephrotic syndrome in children. The methodology relies on histograms of the treatment parameters constructed manually by each physician, applying the method of Johnson et al. (2010). For each physician, a marginal prior for each treatment parameter characterized by location and precision hyperparameters is fit to the elicited histogram...
January 1, 2017: Statistical Methods in Medical Research
Robert W Chuter, Philip Whitehurst, Ananya Choudhury, Marcel van Herk, Alan McWilliam
PURPOSE: The 1.5T Elekta MR-Linac, due to the construction of the system will have a maximum radiation field size in the superior-inferior patient direction of 22cm at isocentre. The field size may impact on the patient groups which can be treated on the system. This technical note aims to address the question of which treatment sites will be affected by field size limitations on the MR-Linac. METHODS: Using historical data for 11,595 cases over 2 years treated at the authors' institution, the proportion of plans that would fit the MR-Linac's field size was determined for eleven patient groups...
September 4, 2017: Medical Physics
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