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교감신경효능 모방약물과 교감신경 수용기 차단제가 흰쥐 악하선의 세포막전압에 미치는 영향에 관한 연구
천재식,이종흔 대한구강생물학회 1984 International Journal of Oral Biology Vol.8 No.1
This experiment was performed to elucidate the effect of adrenergics and adrenergic receptor blockers on the membrane potential of the rat submaxillary gland. Rats of both sexes were anesthesized by intraperitoneal injection of urethan (0.5ml/100gm weight). The segments of submaxillary gland were isolated and placed in a Perspex tissue bath (10ml) perfused with 37℃ Krebs-Henseleit solution, aerated with 95% O_2 - 5% co_2 mixture, flowed at about 10ml/min. Membrane potential were measured with glass microelectrode filled with 3M KCI and 10mM potassium citrate, having a tip resistance of 10∼20MΩ. The microelectrode was connected to preamplifier and the membrane potential was recorded on a pen recorder. 100μM epinephrine and phenylephrine were infused into the tissue bath with a constant infusion pump, respectively and 100μM and 1 mM prazosin, yohimbine and propranolol were also infused in the same method for 30 seconds. The results were as follows: 1. The mean resting potential of rat submaxillary gland cells during perfused with krebs-Henseleit solution was similar with the resting potential which was measured in vivo. 2. Adrenergic drugs evoked hyperpolarization on the rat submaxillary gland cells. 3. 100μM adrenergic receptor blockers were prolonged the effect of adrenergics which were appeared as hyperpolarization, but 1mM prazosin prevented the hyperpolarization which was evoked by epinephrine and 1mM yohimbine also prevented the hyperpolarization which was evoked by phenylephrine.
구강암 세포주에서 Hypericin과 532㎚ DPSS laser를 이용한 In Vitro 광역학 치료
천재식 대한구강악안면병리학회 2009 대한구강악안면병리학회지 Vol.33 No.4
We conducted a series of in vitro experiments to evaluate the anticancer effect of photodynamic therapy using hypericin and 532㎚ DPSS (diode pumped solid state laser). The cultured KB cells were treated with serial concentrations of hypericin ranging from 0.01㎍/㎖ to 5㎍/㎖ (two-fold dilution) with variable laser dosage (10J, 20J, 30J). The cell viability was evaluated by MTT assay. The type of cell death was detected by fluorescent microscope using Hoechst 33342 / PI (propidium iodide) stain methods. In this study, IC50 value with hypericin-mediated PDT with 10J DPSS laser was 35 ng/ml. The maximum cytotoxicity with Photofrin II-based PDT was observed at high drug concentrations(> 90 ng/ml) independent with laser dose. And the in vitro PDT effects depended on the laser dose and drug concentrations were displayed by the difference in the type of cell death, namely apoptosis or necrosis. According to this result, the hypericin based photodynamic therapy with DPSS laser was effective photodynamic therapy.
가토경골에 임플란트 매식 후 주변 골의 diode-laser 조사효과
천재식 대한구강악안면병리학회 2013 대한구강악안면병리학회지 Vol.37 No.1
Dental implants were used for reconstruction of oromaxillofacial defects and they were widely used in dental and medical fields. The implant materials are various , including titanium and ceramics such as zirconium. The property of implant materials have biocompatibility and mechanical strength. Titanium has direct bone anchorage without any other tissues between implant's interface. many researcher's had studied for raising the osseointegration success rate through various method. It was reported over 95% success ratio. many researcher's study the enhancing the speed of bone remodelling and osseointegration. Low Level Laser Therapy is one of the method to accelerlate the speed of bone remodelling and osseointegration. Thus it raise initial stability. The purpose of this study was to evaluate the effect of diode laser irradiation for ossoeintegration in implant interface and between the implants threads. 24 New Zealand white rabbits which were about 3Kg, used for experiment. 2 implant's were implanted every rabbit's tibia. 2 weeks, 4 weeks, 8 weeks after implantation, tissue sample were removed from sacrificed rabbit's tibia. 8 rabbit's were sacrificed every 2, 4, 8 weeks and undecalcified sample were got from tissue sample. The undecalcified samples were investigated by optical microscope. 2 weeks, 4 weeks, 8 weeks experimental groups which were irradiated low level laser therapy showed rapid bone remodelling than control groups. it showed many difference especially in initial stage. Low level laser irradiation increase the volume of new bone formation in implant interface . It was suggested that there were many influence in bone remodelling in early stage, because these were many differences between experimental and control groups. Low level laser irradiation were helpful for immediate loading implant
천재식 대한구강악안면병리학회 2003 대한구강악안면병리학회지 Vol.27 No.4
The purpose of this study was to research the osseointegration in the interface of dental gold alloy. Some investigator presented that gold was biologically safe but occurred fibrous integration on implant interface. We used 4 different gold composition implant to investigate the osseointegration on implant interface. Osseointegration occurred on the all implant interface. We thought that osseointegration depended not only on gold composition but also on precious metal composition such as platinum or silver. If we use precious metal implant, it might reduce the Galvanic current and chemical corrosion which were occurred between titanium implant and percious metal suprastructure. We recommend that precious metal implant was superior to non-precious metal implant without financial problem.
Mouth Guard 장착시 교근 근전도의 변화에 관한 연구
천재식 대한구강악안면병리학회 2006 대한구강악안면병리학회지 Vol.30 No.4
Most Authors reported that mouth guard is a part of equipment for body-contact sports players. Mouth guards protect orofacial injuries but have some problems in breathing and speaking. Some authors reported that mouth guards have also improve the muscle strength and sport ability. This experiment was performed to study the change of masseter muscle EMG after wearing of mouth guard. 10 D university male base ball players were participated in this study. After impression taking, mouth guards were constructed and weared. Masseter muscle EMG and nasal ventilation after ten day's adaptation were checked. They were requested clenching with or without mouth guard. EMG and nasal ventilation were checked by iworx 104 instrument simultaneousley. The result showed that masseteric EMG were improved and nasal ventilation were stable after wearing mouth guard. It concluded that mouth guard had improved muscle activity and stabilized the nasal ventilation depend on experimental method.