Search results for "Tact"

Comparative study of pH for different saline and multi-purpose contact lens solutions.

1997

In this study, we determined the pH of different saline and multipurpose contact lens solutions available on the Spanish market. We examined 10 samples of 14 solutions, seven of which are saline solutions and seven multipurpose ones, from different manufacturers. Both types of solution were found to have significant variations in pH, with values ranging from 6.70 to 7.57 for the saline solutions and 6.84 to 7.63 for the multipurpose solutions. We concluded that the solutions should not affect the ocular physiological performance because their pH values are within the buffering capacity of the eye.

The impact of daily disposable soft contact lens wear on tear film surface quality over a three month period

2017

mplicit Identification of Contact Parameters in a Continuous Chain Model

2011

Accurate contact modeling is of great importance in the field of dynamic chain simulations. In this paper emphasis is on contact dynamics for a time-domain simulation model of large chains guided in a closed loop track. The chain model is based on theory for unconstrained rigid multibody dynamics where contact within the chain and with the track is defined through continuous point contacts using the contact indentation and rate as means. This paper presents an implicit method to determine contact parameters of the chain model through the use of none gradient optimization methods. The set of model parameters are estimated by minimizing the residual between simulated and measured results. The…

Etude d'un emmanchement fretté compte tenu de l'effet combiné des défauts de forme et d'état de surface

2012

The main purpose of this thesis is to present two contributions in the field of shrink fitassembly taking into account the defects of form and roughness surfaces. The first contributionconcerns the study of the influence of the defect forme on the characteristics of shrinked assemblyusing an approach based on finite element modeling. We found that this defect has a significantinfluence on the resistance of the assembly. The work already done in the laboratory of mechanicsat the University of Bourgogne have been confirmed. In the second contribution, we proposed tointegrate the surface defects (roughness) by creating a homogenized finite element interface. Thistechnique has facilitated the m…

Antimicrobial activity and enterococcus faecalis biofilm formation on chlorhexidine varnishes.

2011

Objective: To evaluate, in vitro, the antimicrobial activity and biofilm formation of three chlorhexidine varnishes in four Enterococcus faecalis strains: E. faecalis ATCC 29212, E. faecalis EF-D1 (from failed endodontic treatment), E. faecalis 072 (cheese) and E. faecalis U-1765 (nosocomial infection), and one Enterococcus durans strain (failed endodontic treatment). Study Design: The direct contact test was used to study the antimicrobial activity. Bacterial suspensions were exposed for one hour to EC40, Cervitec (CE) and Cervitec Plus (CEP) varnishes. “Eradication” was defined as 100% bacterial kill. The formation of enterococci biofilms was tested on the surface of the varnishes after 2…

Biological and physico-chemical properties of new root canal sealers

2018

Background The purpose of the present study was to compare the biological and the physico-chemical properties of bioceramic-based root canal sealers, calcium hydroxide-based, MTA-based and epoxy resin-based root canal sealers. Material and methods Two bioceramic-based sealers, one calcium hydroxide-based sealer, one MTA-based sealer and two epoxy resin-based sealers were tested. Results EasySeal and MTA Fillapex showed severe citotoxic activity, AH Plus and SealapexTM moderate cytotoxicity, BioRoot™ RCS and TotalFill BC Sealer were both cytocompatible. Except for TotalFill BC Sealer, all root canal sealers caused inhibition zones when tested with E. faecalis. The highest inhibition zone was…

Antibacterial, physical and mechanical properties of bonding agent containing synthesized Zinc Dimethacrylate

2019

Background The aim of this study includes synthesis of zinc dimethacrylate ionomer (ZDMA) by a new method, incorporate it into resin bonding and evaluate its antibacterial, physical and mechanical properties. Material and methods Resin adhesives containing 0 to 5% wt of ZDMA was produced and the following tests were accomplished: A: Antibacterial test: 1.Direct contact test. 2.Material aging; in both of them the bacterial colony counting were performed. B: Physical test: 1.Degree of conversion (D.C). 2.Evaluating the amount of released Zinc ion release in aqueous medium. C: Mechanical test: 1.Compressive strength test. 2.Shear bond test (enamel and dentine separately). The obtained results …

The interphase model applied to simulate chemically bonded anchors

2009

Propuestas creativas, educativas y terapéuticas. Cómo trabajar con alumnado con problemas sociales

2013

This article comes from the idea that Elementary Spanish classrooms are in dire need of improvement in terms of social relations, not only because of the significant cultural changes that occurred during the dawn of the twenty-first century as a result of migration flows, but because of global economic complications and technological advances that have complicated relationships. In this situation, this article offers a compilation of different activities in the area of artistic expression of Elementary Education, with the aim of improving social contact and relationships of the students of this educational stage. At the same time, it has been considered essential to characterize these activ…

La natura della responsabilità medica: il cambio di rotta

2020

ABSTRACT A tre anni di distanza dall’ approvazione della riforma il saggio propone una riflessione sulla natura della responsabilità medica ed, in particolare, sulla tenuta del presunto cambio di rotta rispetto alla teoria del contatto sociale, alla luce di un diritto vivente divenuto ius receptum e delle sollecitazioni alternative che l’autore individua in una differente lettura della nuova normativa. Three years after the approval of the reform, the essay proposes a reflection on the nature of medical liability and, in particular, on the keeping of the presumed change of course with respect to the theory of social contact, in the light of a case law that has become ius receptum and the al…