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김해송,이주현,이시영,김해니,박호원 대한소아치과학회 2022 大韓小兒齒科學會誌 Vol.49 No.4
This study investigated the effects of silver diamine fluoride (SDF) and potassium iodide (KI) treatments on the acid resistance of dentin exposed to secondary caries. Sixteen bovine dentin specimens with artificially induced caries were assigned to the following four groups: untreated negative control, untreated positive control, SDF-treated (SDF), and SDF and KI-treated (SDFKI). Multispecies cariogenic biofilms containing Streptococcus mutans , Lactobacillus casei , and Candida albicans were cultured on the specimens for 28 days, except for the negative control group. Specimens from the negative control group were stored in phosphate-buffered saline for that period. After a cariogenic biofilm challenge, the degree of demineralization was evaluated using micro-computed tomography (micro-CT). As a result of data analysis using micro-CT, the demineralization depths of the negative control, positive control, SDF, and SDFKI groups were 149.0 ± 7 μm, 392.0 ± 11 μm, 206.0 ± 20 μm, and 230.0 ± 31 μm, respectively. The degree of demineralization was significantly reduced in the SDF and SDFKI groups compared with that in the untreated positive control group. There were no significant differences between the SDF and SDFKI groups. This study confirmed that SDF and SDFKI treatments increase the acid resistance of dentin to secondary caries. KI did not significantly affect the cariesarresting effect of the SDF.
김해송 대한기관식도과학회 1996 大韓氣管食道科學會誌 Vol.2 No.1
Acquired nonmalignant tracheoesophageal fistulas were formerly considered rare lesions, but they have been increasingly reported in the recent past. The pathognomonic complaints of this life-threatening lesion are strangulating sensations and frequent paroxysmal coughings occurring several seconds after the ingestion of liquids or solids. Until the past decade, this lesion was most often caused by infection, trauma, or esophageal diverticula. Complications caused by cuffed tracheal tubes are now becoming more widely noticed. Especially, tracheoesophageal fistula is one of the more unusual of these complications. Author reports two patients with tracheoesophageal fistula caused by cuffed tracheal tube.
Analysis of Snoring and Obstructive Sleep Apnea Using a Portable Sleep Apnea Recorder
김해송 대한비과학회 1996 Journal of rhinology Vol.3 No.1
Polysomnography, the established procedure for the diagnosis of obstructive sleep apnea (OSA), is expensive and requires an overnight stay at an established sleep laboratory. A screening test using a portable recorder for sleep apnea at home would be a relatively convenient means for evaluating sleep apnea patients. The portable recorder measures heart rate, chest impedance, nasal airflow, blood oxygen saturation, body position, and snoring level simultaneously. From October, 1994 through November, 1995, fifty-eight patients referred with snoring and sleep apnea were examined using a portable multichannel sleep apnea recorder-EdenTrace®II (The pattern of sleep apnea was OSA in all cases). The total number of tests was 51. The test results were divided into four groups by the respiratory disturbance index (RDI) : Group I (RDI ≤ 10 ), Group II (10 < RDI ≤ 20), Group III (20 < RDI ≤ 40), and Group IV (RDI > 40). The lowest arterial oxygen saturation (LoSaO₂), and RDI were also obtained. From these date LoSaO₂ was 90.1±4.7%, 85.3±7.0%, 76.0±0.3%, 73.6±12.9% for Group I, Group II, Group III, and Group IV, repectively. RDI was 5.4±3.0 (Group I), 15.5±2.7 (Group II), 28.6±5.2 (Group III), and 52.5±12.3 (Group IV). The results of this study suggest that a portable device can be used as one of screening methods of sleep apnea.
김해송,이주현,김해니,박호원,Haesong Kim,Juhyun Lee,Haeni Kim,Howon Park Korean Academy of Pediatric Dentistry 2023 大韓小兒齒科學會誌 Vol.50 No.1
This study compared the surface roughness and microbial adhesion characteristics of Omnichroma, a novel composite resin developed using "smart chromatic technology", with those of two other conventional composite resins with different filler compositions. A total of 144 specimens were fabricated using 3 types of composite resins: Omnichroma (nano-spherical), Filtek Z350XT (nanofill), and Tetric N-Ceram (nanohybrid) and, divided into 3 groups of 48. Finishing was performed using tungsten carbide burs. Specimens were then divided into 3 subgroups using different polishing methods: Control, SofLex, and PoGo. Surface roughness was analyzed quantitatively and qualitatively using an atomic force microscope and a scanning electron microscope. Microbial adhesion was assessed by culturing Streptococcus mutans on the specimens for 24 hours and then measuring colony-forming units attached to the upper surface. The surface roughness (Ra) of Omnichroma was 0.123 ㎛ after finishing, and it exhibited a smooth surface compared to the other resins. However, after polishing, there were no significant differences in the surface roughness between the three composite groups, regardless of the polishing methods. The surfaces of the Control subgroups were significantly rougher than those of the SofLex subgroups in all 3 composite groups. However, except for Tetric N-Ceram, there were no significant differences between the Control and PoGo subgroups in the other composite groups. Microbial adhesion assessment showed no significant differences between any of the 3 composite resin subgroups; however, Omnichroma exhibited higher microbial adhesion than the other two composites. No significant correlation was observed between surface roughness and microbial adhesion.