Conference on Lasers and Electro-Optics Europe, 1998
The summarization of the results which were obtained with the constructed ErYAG dental laser syst... more The summarization of the results which were obtained with the constructed ErYAG dental laser system (500 mJ maximum energy and 200 μsec length of pulses) whose radiation interacts with the hard dental tissue are presented. The influence of the increasing energy and number of pulses on a profile and depth of drilled holes was investigated when the laser radiation delivery system were an articulated arm or a fluorocarbon polymer coated silver hollow glass waveguide. Also the test with the cutting speed were made.
The purpose of this study was to compare full metal crowns with two different types of veneering ... more The purpose of this study was to compare full metal crowns with two different types of veneering material - ceramics and polymer after a two-year period in a function. The aim was to evaluate the changes of occlusal relief, marginal adaptation, break of material, changes of shape and color and gingival status. One hundred and two crowns were examined in 34 patients immediately after cementation, and they were reviewed within two years of crown placement. These fixed restorations were checked according two modified US Public Health Service System criteria. After two years the crowns were found clinically intact in 94% for metal-ceramics versus 98% for metal-polymer. No crown was lost. There were found significant differences in positions of a crown margin between both materials and marginal adaptation between initial (baseline) and follow-up results. Gingival health at baseline was related in optimal in 67% versus 77%, after two years in 43% versus 71%. Slight mismatch in color occurred in 0 versus 60% crowns, obvious mismatch was apparent in 0 versus 21% crowns after two years. Within the limitations of this study, it was found that the examined metal crowns with two different veneerings are very stable fixed restorations, mechanical resistance and integrity of polymer material was surprisingly good but its color stability presented mismatch after two-years period. Ceramic veneering was excellent in color match but there were three visible cracks of the ceramic layer.
The analysis of the disinfection effect of Nd:YAG laser radiation was investigated for patients w... more The analysis of the disinfection effect of Nd:YAG laser radiation was investigated for patients with high concentration of Streptococcus mutans in saliva (positive result in Saliva-check mutans test). For the interaction the Nd:YAG laser system generated separate switchable wavelengths with the maximum output energies 1.1, 0.6, and 0.3 J for wavelength 1.06 μm, 1.32, μm and 1.44 μm, respectively, was used. Our study proved that after the laser irradiation the Saliva-check test showed negative presence of Streptococcus mutans. The disinfection effect was confirmed for all used radiation wavelength. For 1.44 μm this effect was reached with a smallest energy density.
Electronic healthcare documentation is the key element of electronic healthcare (eHealth). Electr... more Electronic healthcare documentation is the key element of electronic healthcare (eHealth). Electronic oral health record (EOHR) supporting oral medicine is discussed. To provide dentists with a methodology and instrument to create oral health documentation in more efficient way, support information exchange and integration in dental domain and to ease dental decision-making and forensic dentistry identification tasks.The proposed methodology is used to model lifelong EOHR based on a small specific ontology where the use of other classification systems and nomenclatures, e.g. SNODENT, is possible. EOHRwith Lifelong DentCross user interface was developed and it has been supporting dental care at the University Hospital in Prague-Motol. The user interface is working in four languages and controlled by voice or keyboard. Lifelong DentCross user interface is reflecting the way of the work in dentistry and the EOHR can provide both structured and free text information to oral medicine.
The goal of the study was investigation of Er:YAG radiation (wavelength 2.94 μm) interaction with... more The goal of the study was investigation of Er:YAG radiation (wavelength 2.94 μm) interaction with various metal and ceramic brackets and adhesive materials. The source of radiation was a free-running Er: YAG laser generating pulses with energy 280 mJ, 250 μs long and repetition rate 6 Hz (mean power 1.7 W). During the treatment lasting 140 s, water cooling was implemented and only the brackets were irradiated. It has been observed that the brackets were removed easily after the Er:YAG laser irradiation, and temperature rise was limited also for metal brackets. SEM investigation has confirmed less damage of enamel in comparison with non-irradiated samples.
Conference on Lasers and Electro-Optics Europe, 1998
The summarization of the results which were obtained with the constructed ErYAG dental laser syst... more The summarization of the results which were obtained with the constructed ErYAG dental laser system (500 mJ maximum energy and 200 μsec length of pulses) whose radiation interacts with the hard dental tissue are presented. The influence of the increasing energy and number of pulses on a profile and depth of drilled holes was investigated when the laser radiation delivery system were an articulated arm or a fluorocarbon polymer coated silver hollow glass waveguide. Also the test with the cutting speed were made.
The purpose of this study was to compare full metal crowns with two different types of veneering ... more The purpose of this study was to compare full metal crowns with two different types of veneering material - ceramics and polymer after a two-year period in a function. The aim was to evaluate the changes of occlusal relief, marginal adaptation, break of material, changes of shape and color and gingival status. One hundred and two crowns were examined in 34 patients immediately after cementation, and they were reviewed within two years of crown placement. These fixed restorations were checked according two modified US Public Health Service System criteria. After two years the crowns were found clinically intact in 94% for metal-ceramics versus 98% for metal-polymer. No crown was lost. There were found significant differences in positions of a crown margin between both materials and marginal adaptation between initial (baseline) and follow-up results. Gingival health at baseline was related in optimal in 67% versus 77%, after two years in 43% versus 71%. Slight mismatch in color occurred in 0 versus 60% crowns, obvious mismatch was apparent in 0 versus 21% crowns after two years. Within the limitations of this study, it was found that the examined metal crowns with two different veneerings are very stable fixed restorations, mechanical resistance and integrity of polymer material was surprisingly good but its color stability presented mismatch after two-years period. Ceramic veneering was excellent in color match but there were three visible cracks of the ceramic layer.
The analysis of the disinfection effect of Nd:YAG laser radiation was investigated for patients w... more The analysis of the disinfection effect of Nd:YAG laser radiation was investigated for patients with high concentration of Streptococcus mutans in saliva (positive result in Saliva-check mutans test). For the interaction the Nd:YAG laser system generated separate switchable wavelengths with the maximum output energies 1.1, 0.6, and 0.3 J for wavelength 1.06 μm, 1.32, μm and 1.44 μm, respectively, was used. Our study proved that after the laser irradiation the Saliva-check test showed negative presence of Streptococcus mutans. The disinfection effect was confirmed for all used radiation wavelength. For 1.44 μm this effect was reached with a smallest energy density.
Electronic healthcare documentation is the key element of electronic healthcare (eHealth). Electr... more Electronic healthcare documentation is the key element of electronic healthcare (eHealth). Electronic oral health record (EOHR) supporting oral medicine is discussed. To provide dentists with a methodology and instrument to create oral health documentation in more efficient way, support information exchange and integration in dental domain and to ease dental decision-making and forensic dentistry identification tasks.The proposed methodology is used to model lifelong EOHR based on a small specific ontology where the use of other classification systems and nomenclatures, e.g. SNODENT, is possible. EOHRwith Lifelong DentCross user interface was developed and it has been supporting dental care at the University Hospital in Prague-Motol. The user interface is working in four languages and controlled by voice or keyboard. Lifelong DentCross user interface is reflecting the way of the work in dentistry and the EOHR can provide both structured and free text information to oral medicine.
The goal of the study was investigation of Er:YAG radiation (wavelength 2.94 μm) interaction with... more The goal of the study was investigation of Er:YAG radiation (wavelength 2.94 μm) interaction with various metal and ceramic brackets and adhesive materials. The source of radiation was a free-running Er: YAG laser generating pulses with energy 280 mJ, 250 μs long and repetition rate 6 Hz (mean power 1.7 W). During the treatment lasting 140 s, water cooling was implemented and only the brackets were irradiated. It has been observed that the brackets were removed easily after the Er:YAG laser irradiation, and temperature rise was limited also for metal brackets. SEM investigation has confirmed less damage of enamel in comparison with non-irradiated samples.
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