1,720,962 research outputs found
Do complete dentures improve the quality of life of patients?
Get PDFMagister Scientiae Dentium - MSc(Dent)Few studies have documented the impact of complete dentures on patients’ oral health-related quality of life. Objectives: The purpose of this study was to investigate the relationship between gender, age, socioeconomic status and denture satisfactionSouth Afric
Management of defective dental Amalgam restorations-a mixed-methods study
No full textPhilosophiae Doctor - PhD (Community Oral Health)Much variation exists in the practice of dentistry with regard to the
diagnosis of caries and the recommendations for treatment. Even though criteria
for the selection of 'faulty' restorations often appear ill-defined, subjective and/or
variable restoration replacement is a major component of dental practice in
developed countries (Brennan and Spencer, 2006). While the prevalence of caries
is decreasing in developed countries, low- and middle-income countries are
experiencing an increase. The investigation of factors influencing the clinical
decision-making process has identified and compared the roles of technical (e.g.
oral health factors), patient and dentist factors (Brennan and Spencer, 2006; Bader
and Shugars, 1995a; 1995b). A recent trend for a more conservative approach to
restorative dentistry has led to the alternative management of defective dental
restorations. Repair and refurbishment of defective dental restorations have been
established as viable options. The purpose of this study was to provide
information regarding the practices, knowledge and attitudes of South African
dentists with regard to the management of defective dental amalgam restorations
Synthesis and characterization of silver nanoparticles for photovoltaic application
No full textMagister Scientiae - MScWith an increase in the amount of harmful carbon emissions in the atmosphere as well as a decrease in the availability of fossil fuels, there is a relatively high demand for alternate energy devices. Solar cells have become an alternative option in aid of leading the way for clean energy; however these devices are relatively expensive and have an efficiency that is relatively low in comparison to that of fossil fuelled energy. As a result the cost of the solar cell needs to be reduced by reducing the amount of silicon used in order to compete with fossil fuelled devices; however this decrease would lead to a decrease in efficiency. In recent years silver nanoparticles have been extensively researched as a result of its extraordinary optical, electrical, catalytic, magnetic and antibacterial properties. As a result of these properties, the nanoparticles may be applied to many research areas such as photovoltaics, catalysis and medical fields. The optical properties of silver nanoparticles may thus be exploited in order to increase absorption and in turn the efficiency of the solar cell devices. This study focuses on the optimization of the polyol synthesis to possibly obtain uniformly dispersed silver nanoparticles. The silver nanoparticles would then be incorporated onto amorphous silicon thin films, deposited by hot wire chemical vapour deposition, by spraying a suspension of the silver nanoparticles onto the thin films. The silver nanoparticles were viii characterized by Ultra Violet Visible Spectroscopy (UV-VIS), High Resolution Transmission Electron Microscopy, X-ray Diffraction, and Thermogravimetric Analysis. The thin films with the incorporated silver nanoparticles were characterized by UV-VIS, and High Resolution Scanning Electron Microscopy. It was shown that silver nanoparticles with various morphologies were produced by the polyol synthesis and may be used to enhance light trapping of thin film
photovoltaic devices
Alternative Impression Techniques for Complete Denture Patients
No full textThe resource is to be used as an introduction to the recommended clinical procedures for impression techniques for Complete Denture patients. It introduces the clinical procedures and is a step by step guide
Impression Techniques for Fixed Prosthodontics Patients
No full textThe resource is to be used as an introduction to the recommended clinical procedures for impression techniques patients requiring Fixed Prosthodontics. It introduces the clinical procedures and illustrates the use of gingival retraction cord
Synthesis and characterization of silver nanoparticles for photovoltaic application
Get PDFMagister Scientiae - MScWith an increase in the amount of harmful carbon emissions in the atmosphere as well as a decrease in the availability of fossil fuels, there is a relatively high demand for alternate energy devices. Solar cells have become an alternative option in aid of leading the way for clean energy; however these devices are relatively expensive and have an efficiency that is relatively low in comparison to that of fossil fuelled energy. As a result the cost of the solar cell needs to be reduced by reducing the amount of silicon used in order to compete with fossil fuelled devices; however this decrease would lead to a decrease in efficiency. In recent years silver nanoparticles have been extensively researched as a result of its extraordinary optical, electrical, catalytic, magnetic and antibacterial properties. As a result of these properties, the nanoparticles may be applied to many research areas such as photovoltaics, catalysis and medical fields. The optical properties of silver nanoparticles may thus be exploited in order to increase absorption and in turn the efficiency of the solar cell devices. This study focuses on the optimization of the polyol synthesis to possibly obtain uniformly dispersed silver nanoparticles. The silver nanoparticles would then be incorporated onto amorphous silicon thin films, deposited by hot wire chemical vapour deposition, by spraying a suspension of the silver nanoparticles onto the thin films. The silver nanoparticles were viii characterized by Ultra Violet Visible Spectroscopy (UV-VIS), High Resolution Transmission Electron Microscopy, X-ray Diffraction, and Thermogravimetric Analysis. The thin films with the incorporated silver nanoparticles were characterized by UV-VIS, and High Resolution Scanning Electron Microscopy. It was shown that silver nanoparticles with various morphologies were produced by the polyol synthesis and may be used to enhance light trapping of thin film
photovoltaic devices
Management of defective dental Amalgam restorations-a mixed-methods study
Get PDFPhilosophiae Doctor - PhD (Community Oral Health)Much variation exists in the practice of dentistry with regard to the
diagnosis of caries and the recommendations for treatment. Even though criteria
for the selection of 'faulty' restorations often appear ill-defined, subjective and/or
variable restoration replacement is a major component of dental practice in
developed countries (Brennan and Spencer, 2006). While the prevalence of caries
is decreasing in developed countries, low- and middle-income countries are
experiencing an increase. The investigation of factors influencing the clinical
decision-making process has identified and compared the roles of technical (e.g.
oral health factors), patient and dentist factors (Brennan and Spencer, 2006; Bader
and Shugars, 1995a; 1995b). A recent trend for a more conservative approach to
restorative dentistry has led to the alternative management of defective dental
restorations. Repair and refurbishment of defective dental restorations have been
established as viable options. The purpose of this study was to provide
information regarding the practices, knowledge and attitudes of South African
dentists with regard to the management of defective dental amalgam restorations
Do complete dentures improve the quality of life of patients?
No full textMagister Scientiae Dentium - MSc(Dent)Few studies have documented the impact of complete dentures on patients’ oral health-related quality of life. Objectives: The purpose of this study was to investigate the relationship between gender, age, socioeconomic status and denture satisfactionSouth Afric
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
