Jan Sulc

Publications (14)22.82 Total impact

• Article: SPIE BiOS

  Tatjana Dostalova, Helena Jelinkova, Jan Sulc, Petr Koranda, Michal Nemec, Martin Fibrich, Michal Jelinek, Pavel Michalik, Mitsunobu Miyagi
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  ABSTRACT: The investigation of tensile strength needed for bracket debonding was the aim of study. A diode pumped Tm: YAP microchip laser generating a continuous 2um radiation with the maximum output power of 4W was used for debonding purposes. The group of 60 brackets was debonded using classical and laser irradiation methods - the doze from 1W to 4 W, 60s. The tensile strength without laser irradiation was in the range from 39.6 N (full ceramic bracket group) to 63.7 N (ceramic bracket with metal slot group). After irradiation the tensile strength was decreased from 35.1 N (full ceramic bracket group) to 48.8 N (ceramic bracket with metal slot group). The results of our study generally agree with the previous studies, substantiating the fact that lasers can be used effectively to thermally soften the adhesive resin for removal of ceramic brackets. From the practical point of view is conclusion that during laser irradiation, thermal ablation occurs and the bracket is removed from the enamel together with the rest of the adhesive resin. Laser debonding is easier and little heat diffusion occurred.© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
  02/2011;
• Article: Ceramic bracket debonding by Tm:YAP laser irradiation.

  Tatjana Dostalova, Helena Jelinkova, Jan Sulc, Michal Nemec, Michal Jelinek, Martin Fibrich, Pavel Michalik, Mitsunobu Miyagi, Michaela Seydlova
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  ABSTRACT: The aim of this study was to prepare a simple and reliable method for ceramic bracket debonding, ensuring minimal changes in the enamel structure and an acceptable temperature rise in the pulp. Ceramic bracket debonding is based on the principle of degrading the strength of adhesive resin between the tooth and ceramic bracket. The search for a safe and efficient method of adhesive resin removal following debonding has resulted in the introduction of a wide range of instruments and procedures, among which proper use of laser irradiation can be promising. The debonding of two types of ceramic brackets utilized a diode-pumped Thulium:Ytterbium-Aluminium-Perovskite (Tm:YAP) microchip laser generating irradiation at a wavelength of 1998 nm (spot size 3 mm; focused by lens), with two power settings (1-2 W). Loss of enamel and residual resin on teeth, as well as rise in temperature inside the tooth were subsequently investigated in detail. Results: A 1W power of irradiation during a 60-sec period resulted in a temperature rise from 3 to 4°C in the approximate root location. This power is also suitable for debracketing from the point of view of damage to enamel lying below the bracket. Only a slight damage to the enamel was registered by SEM compared to conventional bracket removal. Use of a Tm:YAP laser (wavelength 1998 nm, power 1 W, irradiance 14 W/cm(2), interacting time 60 sec) which is at the same time compact and small enough to be used in the dental practice, together with moderate cooling, could be an efficient tool for debracketing.
  Photomedicine and laser surgery 02/2011; 29(7):477-84. · 1.76 Impact Factor
• Article: Dysprosium-doped PbGa2S4 laser excited by diode-pumped Nd:YAG laser.

  Jan Sulc, Helena Jelínková, Maxim E Doroshenko, Tasoltan T Basiev, Vyacheslav V Osiko, Valerii V Badikov, Dmitrii V Badikov
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  ABSTRACT: We realized a compact mid-IR room temperature operating Dy(3+):PbGa(2)S(4) laser, excited by a diode-pumped Nd:YAG laser at a wavelength of 1318 nm. The pumping laser was operating in pulsed mode with a pulse length of 4 ms and repetition rate of 20 Hz. Maximum pumping energy at a wavelength of 1318 nm was 15 mJ. Energy up to 90 μJ and mean output power of 1.8 mW was obtained at a wavelength of 4290 nm with a slope efficiency with respect to absorbed pumping energy better than 3%.
  Optics Letters 09/2010; 35(18):3051-3. · 3.40 Impact Factor
• Article: Pr:YAlO(3) microchip laser.

  Martin Fibrich, Helena Jelínková, Jan Sulc, Karel Nejezchleb, Václav Skoda
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  ABSTRACT: A cw Pr:YAlO(3) microchip-laser operation in the near-IR spectral region is reported. A microchip resonator was formed by dielectric mirrors directly deposited on the Pr:YAlO(3) crystal surfaces. For active medium pumping, a GaN laser diode providing up to 1W of output power at approximately 448 nm was used. 139mW of laser radiation at 747nm wavelength has been extracted from the microchip-laser system. Slope efficiency related to the incident pumping power was approximately 25%.
  Optics Letters 08/2010; 35(15):2556-7. · 3.40 Impact Factor
• Source

  Available from: Jacek Kwiatkowski

  Chapter: Actively Q-switched Thulium Lasers

  Jan K. Jabczynski, Lukasz Gorajek, Waldemar Zendzian, Jacek Kwiatkowski, Helena Jelinkova, Jan Sulc, Michal Nemec
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  ABSTRACT: The analytical models of quasi-three-level lasers operating in free running and Q-switching regimes were presented. In both cases appropriate formulae enabling the optimization of such lasers were given and analysed. The numerical model of a quasi-three-level laser operating in a Q-switching regime including additional pump dependent losses, was elaborated to explain the properties of the developed actively Q-switched laser. The main difference in analysis of Q-switching in a quasi-three-level laser (compared to a four-level laser) consists of the effect of temperature on giant pulse parameters. Because of increase in temperature with pump power, the net inversion, additional reabsorption and diffraction losses significantly influence available pulse energy, peak power and pulse duration. The all above mentioned effects result in the fact, that giant pulse is generated for a considerable level of losses dependent on effective average heat power dissipated in the gain medium. The results of numerical modelling were confirmed in the experiments. To compare models with experiments we have presented the results of investigations of an efficient Tm:YLF laser end-pumped by 30-W fiber coupled laser diode bar. The incident pump density exceeded above 5 times the saturation pump density, thus the drawbacks of the quasi-three-level scheme have been mitigated. We have obtained the best output characteristics (slope and maximum power) for out-coupling losses of 20% evidencing the high roundtrip gain for maximum pump power. Above 7-W of output power for incident
  02/2010; , ISBN: 978-953-7619-80-0
• Article: Continuous-wave blue generation of intracavity frequency-doubled Pr:YAP laser.

  Martin Fibrich, Jan Sulc, Helena Jelínková, Karel Nejezchleb, Václav Skoda
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  ABSTRACT: We report the cw blue generation of Pr:YAP laser emission at room temperature, which has been achieved by intracavity frequency doubling of the near-IR-emitting Pr:YAP laser operating at a fundamental wavelength of 747 nm. For active medium pumping, a GaN laser diode providing up to 1 W of output power at approximately 448 nm was used. With beta barium borate crystal employed as a nonlinear medium, 12.3 mW of output power at 373.5 nm has been obtained.
  Optics Letters 01/2010; 35(2):214-6. · 3.40 Impact Factor
• Article: Oscillation properties of dysprosium-doped lead thiogallate crystal.

  Maxim E Doroshenko, Tasoltan T Basiev, Vyacheslav V Osiko, Valerii V Badikov, Dmitrii V Badikov, Helena Jelínková, Petr Koranda, Jan Sulc
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  ABSTRACT: The room-temperature laser-oscillation properties of lead thiogallate crystals doped with dysprosium ions PbGa(2)S(4):Dy(3+) without additional codoping and codoped with potassium ion for excessive charge compensation were investigated. A slope efficiency of 1% was obtained for the codoped crystal. YAP:Er -1.66 microm laser resonant pumping of PbGa(2)S(4):Dy(3+) laser was compared with YAG:Nd -1.32 microm nonresonant pumping. The maximum energy obtained was 57 microJ with the negligible influence of the atmosphere.
  Optics Letters 04/2009; 34(5):590-2. · 3.40 Impact Factor
• Article: Cytokine gene polymorphisms and BALF cytokine levels in interstitial lung diseases.

  Martina Vasakova, Martina Sterclova, Libor Kolesar, Antonij Slavcev, Petr Pohunek, Jan Sulc, Ilja Striz
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  ABSTRACT: The aim of our study is to investigate correlations of T(H)1/T(H)2 cytokine gene polymorphisms and bronchoalveolar lavage fluid (BALF) cytokine values in interstitial lung diseases (ILD). In 16 sarcoidosis, 7 idiopathic pulmonary fibrosis (IPF) and 8 hypersensitivity pneumonitis (HP) patients we evaluated IL-1 alpha, -1R, -1RA, -2, -4, -4R alpha, -6, -10, -12, IFN-gamma, TGF-beta1 and TNF-alpha gene polymorphisms in peripheral blood, and MCP-1,MIP-1 alpha, MIP-1 beta, RANTES, ENA-78, FGF, G-CSF, GM-CSF, IFN-gamma, IL-1 alpha, IL-1RA, IL-1 beta, -2, -4, -5, -6, -8, -10, -17, TNF-alpha, Tpo and VEGF values in BALF. We found higher TNF-alpha values in IL-1R pst 1970 TT homozygotes regardless of diagnosis (p=0.0126). In the sarcoidosis group IL-4R alpha(+1902)AA and IL-10(-1082)G allele correlated with higher BALF ENA-78 levels (p=0.0258, p=0.0230). In the HP group the IL-6(-174)CG and IL-6(nt565)AG correlated with higher ENA-78 BALF levels (p=0.0253). In the IPF group the IL-1 beta +3962 CC homozygotes had lower IL-1RA BALF values (p=0.046). BALF chemokine values did not differ between ILD subgroups, except for IL-8, which was higher in stage III sarcoidosis patients compared to stage I. Our results show a probable influence of gene polymorphisms, namely IL-4R alpha and IL-10 on ENA-78 BALF levels in sarcoidosis, IL-6 on ENA-78 BALF levels in HP and IL-1-beta on IL-1RA BALF values in the IPF group. The TNF-alpha BALF values correlated with IL-1R pst 1970 gene polymorphisms.
  Respiratory medicine 01/2009; 103(5):773-9. · 2.33 Impact Factor
• Article: Cytokine gene polymorphisms and high-resolution-computed tomography score in idiopathic pulmonary fibrosis.

  Martina Vasakova, Ilja Striz, Juraj Dutka, Antonij Slavcev, Sarka Jandova, Libor Kolesar, Jan Sulc
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  ABSTRACT: Idiopathic pulmonary fibrosis (IPF) is a serious disease with unknown cause and the influence of cytokine gene polymorphisms is presumed in the etiology and pathogenesis of the disease. We used high-resolution computed tomography (HRCT) as a marker of disease stage and progression and compared the alveolar and interstitial score with IL-1, IL-4, IL-12, IL-1RA and IL-4RA cytokine gene polymorphisms. The IPF patients were all Caucasians from the Czech Republic and consisted of 20 females and 10 males, with a mean age of 65 years, range 36-85. The HRCT results were evaluated by an experienced viewer using the interstitial and alveolar score scales, which were based on the IPF HRCT description system from Gay SE, Kazerooni EA, Tows GB, Lynch JP, Gross BH, Cascade PN, et al. [Idiopathic pulmonary fibrosis. Predicting response to therapy and survival. Am J Respir Crit Care Med 1998;157:1063-72]. We evaluated the polymorphisms of cytokine genes utilizing a PCR with sequence-specific primers method. The HRCT alveolar score was more pronounced in IL-4 RA (+1902) AG heterozygotes. The HRCT interstitial score was less severe in the IL-12 (-1188) AA homozygotes. According to progression of the HRCT interstitial score, the CC homozygosity at IL-1 RA (mspa 111100), the AA homozygosity at IL-4 RA (+1902) and CC homozygosity at IL-4(+33) positions were more frequent in patients with stable disease compared to those with progressive disease. We assume from our data that the polymorphisms of IL-4, IL-4RA, IL-1RA and IL-12 genes (genes of cytokines with regulatory activity) might influence the phenotype of IPF as shown by measurable changes in HRCT investigations.
  Respiratory Medicine 06/2007; 101(5):944-50. · 2.47 Impact Factor
• Article: X-ray opaque waveguide for dentistry.

  Tatjana Dostálová, Helena Jelínková, Michal Nemec, Jan Sulc, Mitsunobu Miyagi, Yi-Wei Shi, Yuji Matsuura
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  ABSTRACT: The aim of this study is the design, realization, and examination of a new x-ray contrast hollow waveguide which will be suitable for x-ray diagnostics or treatment required in medicine, as dentistry, maxiollofacial surgery or oncology. With the growing usefulness of laser radiation therapeutic interventions, a strong demand for radiation delivery from the laser source to the interaction place has appeared. For more complicated surgery, especially for internal intervention, an x-ray is necessary. In such cases, as a minimum, the end of the delivery system must be x-ray contrasted to distinguish where the interaction of radiation with tissue would take place. Up to now, neither fiber, hollow waveguide, nor other delivery system have been x-ray opaque. A new type of hollow glass waveguide was designed, fabricated, and examined as a delivery system for an endodontic treatment. The system is composed from the cyclic olefin polymer coated silver hollow glass waveguide with special covering for x-ray visibility. The inner diameter of the waveguide was 320 microm, the outer diameter was 630 microm, and its length was 100 mm. After the delivery system was created, the hollow waveguide was checked under an x-ray machine and its opacity was measured. For actual treatment, an Er:YAG laser system generating a mid-infrared radiation was used. The root canals of 10 molars were treated endodontically, and the result of that treatment was compared with the common cleaning methods. During treatment, digital x-ray images were taken with conventional files, using this new designed hollow waveguide. The position of a metal instrument demonstrates the quality of opacity after conventional step-back technique. The hollow waveguide is visible in the left tooth canal. A bone density analysis shows no differences between a left (waveguide) and right (tooth) canal. It was demonstrated that no differences exist between x-ray opacity of the metal instrument used for endodontic treatment and a special hollow waveguide. The digitalized, three-dimensional image helps to detect a precise position of customary instrument or waveguide in root canal.
  Photomedicine and Laser Surgery 07/2004; 22(3):221-5. · 1.25 Impact Factor
• Source

  Available from: usp.br

  Article: Diode laser-activated bleaching.

  Tatjana Dostalova, Helena Jelinkova, Devana Housova, Jan Sulc, Michal Nemec, Mitsunobu Miyagi, Aldo Brugnera Junior, Fatima Zanin
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  ABSTRACT: This study describes a preclinical investigation with laser-activated bleaching agent for discolored teeth. Bleaching techniques involve a broad-spectrum approach utilizing hydrogen peroxide (3-38%) with or without heat or laser, carbamide peroxide (10-30%), or a mixture of sodium perborate and hydrogen peroxide. Extracted human maxillary central incisors were selected. In the bleaching experiment, 38% hydrogen peroxide was used. Two different laser systems and light emission diodes for activation of the bleaching agent were used: diode laser, wavelength 970 nm, and infra-red diode laser, wavelength 790 nm, with eight blue light emission diodes, wavelength 467 nm. The enamel surface was evaluated with the scanning electron microscope. The method of chemical oxidation resulted in a 2-3 shade change in one treatment (15 min). Shorter time (5 min) was not effective. The diode laser, wavelength 970 nm, and the bleaching agent produced the same effect but with a shorter time of bleaching process (5 min - 1 W, 2.5 min - 2 W). Infra-red diode laser, wavelength 790 nm with eight blue light emission diodes, wavelength 467 nm, and the bleaching agent reached the desired color shade also after a shorter time (5 min - 40 mW). Slight surface modification after the bleaching process was detected with scanning electron microscopy. Currently, the laser has been proven the most valuable energy source for power bleaching with simple and short application in the dental office.
  Brazilian Dental Journal 02/2004; 15 Spec No:SI3-8.
• Article: Erbium:YAG laser lithotripsy by use of a flexible hollow waveguide with an end-scaling cap.

  Katsumasa Iwai, Yi-Wei Shi, Koh Nito, Yuji Matsuura, Takao Kasai, Mitsunobu Miyagi, Seichi Saito, Youichi Arai, Naomasa Ioritani, Yoshihide Okagami, Michal Nemec, Jan Sulc, Helena Jelinkova, Miroslav Zavoral, Oto Kohler, Pavel Drlik
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  ABSTRACT: An Er:YAG laser light delivery system composed of a polymer-coated silver hollow waveguide and a quartz sealing cap has been developed for calculus fragmentation. Sealing caps with various distal-end geometries were fabricated, and the focusing effects of these caps for Er:YAG laser light were measured both in air and in water. Owing to the high power capability of the quartz a beam of sealing caps, Er:YAG laser light with an output energy of 200 mJ and a repetition rate of 10 Hz was successfully transmitted in saline solution by use of the system. Calculus fragmentation experiments conducted in vitro showed that the delivery system is suitable for medical applications in lithotripsy. We also found that the cap with a focusing effect is more effective in cutting calculi. The deterioration of the sealing caps after calculus fragmentation is also discussed.
  Applied Optics 06/2003; 42(13):2431-5. · 1.41 Impact Factor
• Article: Endodontic treatment with application of Er:YAG laser waveguide radiation disinfection.

  Tatjana Dostálová, Helena Jelínková, Devana Housová, Jan Sulc, Michal Nemeć, Jana Dusková, Mitsunobu Miyagi, Martin Krátky
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  ABSTRACT: The objective of this study is to examine the ability of Er:YAG laser radiation. Using a movable waveguide helps to obtain an antibacterial effect, not only in root canal walls but also in the surrounding tissues. Conventional endodontic treatment is not fully effective due to microbial colonization of root canal walls dentin in premolars and molars. Various laser systems seem to be effective to kill the remaining microbial content in the root canal. The problem is in the flexibility of laser system tips. The Er:YAG laser system was designed with a fluorocarbon polymer-coated silver hollow glass waveguide. Root canal systems of 44 premolars and molars were treated endodontically, using a step-back technique; 10 teeth were then treated with calcium hydroxide paste, and 22 teeth were irradiated by a movable waveguide. Before and after treatment, the colony-forming units were counted to determine 21 various microorganisms. Classical enlargement and shaping of the root canal is effective in 60%. Application of calcium hydroxide prepares sterile root canal in 80%. Er:YAG laser irradiation via movable waveguide (energy of 100 mJ, 30 pulses, repetition rate 4 Hz) can ensure residual disinfection of the root canal. Application of Er:YAG laser radiation through a flexible waveguide helps to attain antibacterial effect, not only in the root canal walls, but also in the surrounding tissues. Therapeutic doses of laser radiation guarantee one-step disinfection, including of anaerobic microorganisms.
  Journal of Clinical Laser Medicine & Surgery 07/2002; 20(3):135-9.
• Article: BiOS 2000 The International Symposium on Biomedical Optics

  Helena Jelinkova, Mitsunobu Miyagi, Pavel Cerny, Jan Sulc, Yi-Wei Shi, Yuji Matsuura
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  ABSTRACT: The flexible hollow waveguides - a cyclic olefin polymer- coated silver hollow glass waveguides with various inner diameters - specially prepared for the delivery of high power 1.06 micrometers radiation were investigated using an oscillator-3 amplifiers Nd:YAG laser system. The length of a single pulse was equal to 50 psec. In dependence to a diameter of the waveguide, transmission/attenuation as a function of the input laser energy were measured together with the input/output time radiation characteristics and the spatial distribution of the output beam. The input energy up to 80 mJ, 70 mJ, and 30 mJ was transmitted with an efficiency higher that 90 percent for the COP/Ag hollow waveguides with a diameter of 1000 micrometers , 700 micrometers , and 540 micrometers , respectively. The picosecond temporal measurements show that the delivered pulse duration was not changed within a resolution of 5 picosecond. Therefore the maximum transmitted power reached was 1.5 GW. The characteristics obtained make all these waveguides very promising for the delivery of high-power laser pulse in special medical and other applications.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
  05/2000;