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  • 1. Haluzíková, B.
    et al.
    Valíček, Jan
    Škubala, P.
    Harničárová, Marta
    Brávzina, D.
    Szarková, V.
    Koštial, Pavel
    Kušnerová, Milena
    Rokosz, Krzysztof
    Tomkowski, Robert
    Koszalin Univ Technol, Dept Surface Elect, Fac Mech Engn, Koszalin, Poland.
    Kaplonek, W.
    Identification of Surface Quality of Plastic Electrodes after Blasting2013In: Diffusion in Solids and Liquids VIII, Trans Tech Publications, 2013, Vol. 334, p. 71-76Conference paper (Refereed)
    Abstract [en]

    Nowadays, plastics have become one of the most demanded materials, replacing the traditional ones such as metals. Therefore, many companies are concerned with the production of plastics, with their distribution and innovation development. Plastics have found utility in a wide range of applications, we use them every day. Measurement of surface roughness of plastic moldings produced by the injection molding process was carried out by a contact profilometer Mitutoyo Surftest SJ401. A reason for this measurement is to obtain information about surface roughness. For further technical adjustment is required to have higher surface roughness what helps to increase electrical conductivity of plastic moldings. This involves determination of a ratio between Ra/Rz (the ratio between the arithmetic average of the roughness profile Ra and the average maximum height of the profile Rz) in order to satisfy customer demand for achieving better surface characteristics leading to an increase in electrical conductivity.

  • 2. Janiszewska-Olszowska, Joanna
    et al.
    Szatkiewicz, Tomasz
    Tomkowski, Robert
    Department of Fine Mechanics, Koszalin University of Technology, Koszalin, Poland.
    Tandecka, Katarzyna
    Grocholewicz, Katarzyna
    Effect of orthodontic debonding and adhesive removal on the enamel - current knowledge and future perspectives - a systematic review.2014In: Medical Science Monitor, ISSN 1234-1010, E-ISSN 1643-3750, Vol. 20, p. 1991-2001Article in journal (Refereed)
    Abstract [en]

    After orthodontic treatment, brackets are debonded and residual adhesive is removed, causing iatrogenic enamel damage. The aim of this study was to review the methods of orthodontic adhesive removal, find clear evidence, and provide a rationale for this procedure. A literature search was performed in PubMed, Dentistry and Oral Sciences, Scopus, Cochrane, Google, and Google Scholar using keywords: orthodontic adhesive removal, orthodontic debonding, orthodontic clean-up. Studies concerning human enamel roughness or loss from debonding and adhesive removal were considered. Forty-four full-text articles were analyzed and 3 were rejected after detailed reading; finally 41 papers were included. Fifteen qualitative studies, 13 studies based on indices of enamel surface, and 13 quantitative studies were found. No meta-analysis could be performed due to a lack of homogenous quantitative evidence. The most popular tools were tungsten carbide burs, which were faster and more effective than Sof-Lex discs, ultrasonic tools, hand instruments, rubbers, or composite burs. They remove a substantial layer of enamel and roughen its surface, but are less destructive than Arkansas stones, green stones, diamond burs, steel burs, and lasers. Multi-step Sof-Lex discs and pumice slurry are the most predictable enamel polishing tools. Arkansas stones, green stones, diamond burs, steel burs, and lasers should not be used for adhesive removal. The use of tungsten carbide bur requires multistep polishing. Further efforts should be made to find tools and methods for complete removal of adhesive remnants, minimizing enamel loss and achieving a smooth surface.

  • 3. Janiszewska-Olszowska, Joanna
    et al.
    Tomkowski, Robert
    Faculty of Mechanical Engineering, Koszalin University of Technology.
    Tandecka, Katarzyna
    Stepien, Piotr
    Szatkiewicz, Tomasz
    Sporniak-Tutak, Katarzyna
    Grocholewicz, Katarzyna
    Effect of orthodontic debonding and residual adhesive removal on 3D enamel microroughness.2016In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 4, article id e2558Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Termination of fixed orthodontic treatment is associated with bracket debonding and residual adhesive removal. These procedures increase enamel roughness to a degree that should depend on the tool used. Enamel roughening may be associated with bacterial retention and staining. However, a very limited data exists on the alteration of 3D enamel roughness resulting from the use of different tools for orthodontic clean-up.

    AIMS: 1. To perform a precise assessment of 3D enamel surface roughness resulting from residual adhesive removal following orthodontic debonding molar tubes. 2. To compare enamel surfaces resulting from the use of tungsten carbide bur, a one-step polisher and finisher and Adhesive Residue Remover.

    MATERIAL AND METHODS: Buccal surfaces of forty-five extracted human third molars were analysed using a confocal laser microscope at the magnification of 1080× and 3D roughness parameters were calculated. After 20 s etching, molar tubes were bonded, the teeth were stored in 0.9% saline solution for 24 hours and debonded. Residual adhesive was removed using in fifteen specimen each: a twelve-fluted tungsten carbide bur, a one-step finisher and polisher and Adhesive Residue Remover. Then, surface roughness analysis was repeated. Data normality was assessed using Shapiro-Wilk test. Analysis of variance (ANOVA) was used to compare between variables of normal distribution and for the latter-Kruskal-Wallis test.

    RESULTS: Sa (arithmetical mean height) was significantly different between the groups (p = 0, 01326); the smoothest and most repeatable surfaces were achieved using Adhesive Residue Remover. Similarly, Sq (root mean square height of the scale-limited surface) had the lowest and most homogenous values for Adhesive Residue Remover (p = 0, 01108). Sz (maximum height of the scale-limited surface) was statistically different between the groups (p = 0, 0327), however no statistically significant differences were found concerning Ssk (skewness of the scale-limited surface).

    DISCUSSION: Confocal laser microscopy allowed 3D surface analysis of enamel surface, avoiding the limitations of contact profilometry. Tungsten carbide burs are the most popular adhesive removing tools, however, the results of the present study indicate, that a one step polisher and finisher as well as Adhesive Residue Remover are less detrimental to the enamel. This is in agreement with a recent study based on direct 3D scanning enamel surface. It proved, that a one-step finisher and polisher as well as Adhesive Residue Remover are characterized by a similar effectiveness in removing residual remnants as tungsten carbide bur, but they remove significantly less enamel.

    CONCLUSION: Orthodontic debonding and removal of adhesive remnants increases enamel roughness. The smoothest surfaces were achieved using Adhesive Residue Remover, and the roughest using tungsten carbide bur.

  • 4. Tomkowski, Robert
    Holmberg, Jonas (Contributor)
    RISE.
    Jonsson, Stefan (Contributor)
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    Hammersberg, Peter (Contributor)
    Chalmers.
    Kristoffersen, Hans (Contributor)
    RISE.
    Nerman, Peter (Contributor)
    Scania CV AB.
    Olavison, Jari (Contributor)
    Volvo AB.
    Archenti, Andreas (Contributor)
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Metrology and Optics.
    The Barkhasuen Noise Measurements: Good Practice Guide2018 (ed. 1)Book (Refereed)
    Abstract [en]

    The KTH Royal Institute of Technology (Stockholm, Sweden) as a project leader allowed strengthening collaboration between academic and industrial experts in the field of non-destructive testing (NDT), machining and metrology. This scientific consortium had found an efficient way for scientific collaboration, in which we conducted many experiments, meetings, and talks on the project’s research subject. This book is a result of all the mentioned activities and more. Many experts from both sides actively participated in the creation of this guide and are listed in the list of contributors.

    The authors hope that after reading this guide, BN measurements can be carried out more systematically, with higher accuracy, traceability and lower uncertainty. The authors do not aim to replace a whole raft of good textbooks, operator’s manuals, specifications, and standards (if they exist); rather, they want to present an overview of good practices and techniques. These recommendations are also a result of many discussions conducted by the project team members during the project’s duration.

    The book is divided into two parts. The first part of the book, “Measurement Good Practice Guide”, presents a comprehensive overview of the Barkhausen noise (BN) measurement method used to describe and analyze different features of ferromagnetic materials, such as residual stress level, hardening depth, among others. The primary focus is on mechanical parts for the automotive industry, in particular, the camshaft and crankshaft. The good practice guide is intended for those who need to make BN measurements but are not necessarily trained to use this method or are still not comfortable about measurement itself. By reading this guide, one can gain basic knowledge regarding good practices for making magnetic measurements with the BN method. Based on a few principles and tips from good practices, the reader will be able to create a Standard Operating Procedure (SOP) for their purpose. SOPs for BN are presented in the appendices.

    The second part of the book “Qualification and Certification of Personnel” presents requirements of the personal certification for Barkhausen testing and is aligned with applicable standards. The authors recommend performing internal and external certification of personnel to do achieve more conscious and reliable measurements.

    This book has been prepared by the scientific consortium under the research project FFI OFP4p – Non-Destructive Characterization Concepts for Production, 2015–2018 co-founded in 50% by VINNOVA, Sweden’s innovation agency. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.

  • 5.
    Tomkowski, Robert
    et al.
    Koszalin University of Technology.
    Kaplonek, Wojciech
    Koszalin University of Technology.
    Lukianowicz, Czeslaw
    Koszalin University of Technology.
    Lipinski, Dariusz
    Koszalin University of Technology.
    Mapping Accuracy of the Surface Topography in Optical Measurements2014In: / [ed] Jerzy Sladek, Wladyslaw Jakubiec, 2014Conference paper (Refereed)
    Abstract [en]

    Accuracy of measurement data registration considerably influences on values of surface topography parameters. Obtaining high precision and therefore correct mapping of the evaluated surface is of great importnace not only in case of determining surface roughness parameters but also its features, essentail because of service reason. The hereby work evaluates accuracy of mapping surface texture of surface roughness standars (standard with a single groove with nominal height 4.646 um, and surface roughness standard DIN 4763 with nominal value of parameter Ra=0.25 um). The measurements weere carried out using advanced optical measuremne t technniques, making use of white light interferometry and confocal laser scanning microscopy. Analysis of the obtained measurement data allowe fro determing the precision of mapping the stereometric feature of the evaluated surfaces and the possibilities of the applied devices.

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