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001-es BibID:BIBFORM023393
Első szerző:Hegedűs Csaba (fogszakorvos)
Cím:3D reconstruction based on hard tissue microtome cross-section pictures in dentistry / Csaba Hegedűs, Emese Flóra-Nagy, Renáta Martos, Alexander Juhász, Ildikó Fülöp, Sándor Pomaházi, István Péter Nagy, Zoltán Tóth, Ildikó Márton, Gusztáv Keszthelyi
Dátum:2000
Megjegyzések:The aim of this study was to examine the accuracy of the computerized 3D surface analyzing and volume measuring method in dentistry. Two different types of test objects were used in the first part of the measurements. Each sample of the two groups was cross-sectioned using a hard tissue microtome. The sections were photographed on both sides and were projected on a graphical tablet and analyzed using a computer program. The measured and calculated parameters were compared. In the second part, 200 microm thick horizontal sections were prepared from 11 human incisor roots using the hard tissue microtome. This way, five sections were prepared from the apical 2 mm of each root. The effects of section thickness and number were modeled by decreasing the inclusion rate of the obtained number of sections from 10 to 2 and its influence on the calculated results was determined. This method was suitable for the approximation and analysis of 3D parameters. The results indicated that using 200-300 microm section thickness, the measured values were approximately 8-21% lower than the real parameters.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Computer Methods and Programs in Biomedicine 63 : 2 (2000), p. 77-84. -
További szerzők:Flóra-Nagy Emese (fogorvos) Martos Renáta (1975-) (fogszakorvos) Juhász Alexander (1960-) (egyetemi adjunktus) Fülöp Ildikó Pomaházi Sándor Nagy István Péter (1964-) (vegyész, kémikus) Tóth Zoltán (1952-) (vegyész, kémikus) Márton Ildikó (1954-) (fogszakorvos) Keszthelyi Gusztáv (1941-2011) (fogszakorvos)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM004647
Első szerző:Hegedűs Csaba (fogszakorvos)
Cím:An atomic force microscopy study on the effect of bleaching agents on enamel surface / Hegedus, C., Bistey, T., Flora-Nagy, E., Keszthelyi, G., Jenei, A.
Dátum:1999
Megjegyzések:The aim of the present study was to evaluate the effect of three peroxide-containing bleaching agents, Opalescence, Nite White and a 30% hydrogen peroxide solution, on enamel surfaces using Atomic Force Microscopy (AFM). METHODS: Fifteen non-carious human incisors (ten maxillary and five mandibular, extracted for periodontal reasons) were used. The teeth were divided randomly into three groups of five, according to the bleaching agents. The labial surface of each tooth was imaged by AFM before and after treatment. Each bleaching agent was applied for a total of 28 h (in individual 4 h treatments). The specimens were examined only after 28 h of treatment. RESULTS: On comparing the AFM images of untreated and treated enamel, surface alterations were observed after 28 h of treatment with Opalescence, Nite White and 30% hydrogen peroxide solution. Several grooves present in the enamel surface of untreated teeth became deeper after the bleaching procedure. The depths of the grooves increased in each case. The increase in the depth of grooves was more pronounced in the case of the 30% H2O2 solution. CONCLUSION: Home-use bleaching agents are capable of causing enamel surface alterations. It is hypothesized that the peroxide-containing bleaching agents affect the organic phase of enamel. Peroxides can affect not only the surface but also the inner structure of enamel. As a result of its low molecular weight, hydrogen peroxide can penetrate into the enamel. Thus, inner oxidative effects are more likely to occur in the subsurface enamel where more organic material is present and oxidation is capable of altering the outer enamel and the surface
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
administration and dosage
analogs and derivatives
chemistry
Comparative Study
Dental Enamel
Drug Carriers
Drug Combinations
drug effects
Human
Hungary
Hydrogen Peroxide
Incisor
methods
Microscopy
Microscopy, Atomic Force
Molecular Weight
Oxidants
Oxidation-Reduction
Peroxides
Polyvinyls
therapeutic use
Time Factors
Tooth Bleaching
ultrastructure
Urea
egyetemen (Magyarországon) készült közlemény
Megjelenés:Journal of Dentistry. - 27 : 7 (1999), p. 509-515. -
További szerzők:Bistey Tamás (1973-) (egyetemi tanársegéd, fogszakorvos) Flóra-Nagy Emese (fogorvos) Keszthelyi Gusztáv (1941-2011) (fogszakorvos) Jenei Attila (1966-) (biofizikus)
Internet cím:elektronikus változat
DOI
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