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인공타액 오염이 수종 상아질접착제와 상아질간의 결합에 미치는 영향
오원만,양규호,류미애 大韓齒科保存學會 1992 Restorative Dentistry & Endodontics Vol.17 No.2
The purpose of this study was to evaluate the influence of artificial saliva contamination on bonding of several dintin adhesives to dentin. Sixty-three human molar teeth extracted within a month were used. Each tooth was sectioned longitudinally in a buccolingual direction to obtain 126 wpecimens. These specimens were randomly divided into three froups and were treated by Scotchbond 2, Gluam and All vond. Each group was subdivided into three subgroups; normal group not contaminated with artificial saliva, contaminated with artificial saliva and dried group, and contaminated with artificial saliva and washed and dried group. Enamel/dentin bonding agent (Dental Adhesive of Scotchbond 2) was applied light cured on the treated dentin surfaces. Threrafter P-50 were cured on them, and specimens were storde in 37℃ artificial saliva for 24 hours before measuring shear bond strength. Shear bond strengths were determined using an universal testing machine with cross head speed 1mm/min and SEM examinations were conducted to evaluate the resin-dintin interface and degree of penetrating resin string into the dentinal tubules. The following results were obtained. 1. Normal gropqs ont contaminated with artificial saliva showed greater shear bond streagth than any other group contaminated with artificial saliva)P<0.01). 2. The shear bond strengths showed no significant difference between washed groups with distilled water and ont washed groups after contamination with artificial saliva(P>0.05). 3. In normal groups, the shear bond strength of A group was significantly greater than in any other group(P<0.01). 4. In S and G groups, fractrues after shear bond strength tests occured adhesively on resintooth interface in all specimens. But in A groups, fractrue of the normal group occured cohesively in dentin and fractrue of the contaminated groups coourde adhesively and cohesively. 5. On SEM examination, the number of resin strings penotrated into dentinal tubules were the greatest in normal groups, followed by, in descending oredr, wasghed groups and not washed groups after contamination with artificial saliva.
백서 척수에서 Capsaicin과 Eugenol이 iCGRP (immunoreactive calcitonin gene-related peptide) 분비 조절에 미치는 영향
오원만,김원재,최남기,박상원,황인남,김선현 大韓齒科保存學會 2001 Restorative Dentistry & Endodontics Vol.26 No.5
Neuropeptide such as calcitonin gene-related peptide and substance P may mediate neurogenic inflammation, but little is known about the regulation of neuropeptide release from rat spinal cord. Eugenol has been reported to reduce odontogenic pain and is known to have a structure similar to capsaicin, a potent stimulant of certain nociceptors. This study was done to examine the effect of capsaicin and eugenol on immunoreactive calcitonin gene-related peptide (iCGRP) release from rat spinal cord and whether eugenol regulates capsaicin-sensitive release of iCGRP or it evokes capsaicin-sensitive release of iCGRP. The dorsal half of rat lumbar spinal cord was chopped into 200㎛ slices. They were superfused (500㎕/min) in vitro with an oxygenated Kreb's buffer. The EC50 of capsaicin on iCGRP release was measured. Eugenol (600㎛ and 1.2mM) and vehicle (0.02% 2-hydroxyl-β-cyclodextrin) were administered prior to stimulation of rat lumbar spinal cord with capsaicin. The amount of iCGRP release from rat lumbar spinal cord was measured by radioimmunoassay. The results were as follows : 1.iCGRP release from rat lumbar spinal cord was dependent on concentration of capsaicin. The EC50 of capsaicin on iCGRP release was 3㎛. 2.In the vehicle treated group, capsaicin (3㎛) evoked a 14-fold increase over basal iCGRP level. 3. Administration of 600㎛ and 1.2mM eugenol evoked a 2.2-fold increase and a 2.3-fold increase over basal iCGRP level respectively. 4.Administration of 600㎛ and 1.2mM eugenol increased capsaicin evoked release of iCGRP by more than 50%. These results indicate that eugenol evoke CGRP release from central nervous system and potentiate the pain-inducing action of capsaicin on it Key words : Eugenol, Capsaicin, Rat lumbar spinal cord, Superfusion, Radioimmunoassay
발거된 자연치와 5종 Shade Guide의 색채 계측기를 이용한 색상 비교
황인남,오원만 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2
The tristimulus values of 180 extracted maxillary and mandibular anterior teeth were measured by colorimeter. And it were colnverted to Munsell color order system(Hue, Value, Chroma) and CIE L^*a^*b^* color coordinates. The commonly used Vita, and Bioform shade guides, 2 composite resin shade guides(Prisma APH and Z-100), and a glass-ionomer shade guide(Fuji II) were compared with these teeth. At the middle facial surface, color distributions of teeth were Hue(0.56YR to 9.77Y), Value(2.46 to 7.9), and Chroma(0.14 to 2.20), And the aberaged values and standard deviations for L^*a^*b^* were 63.18±10.44, 1.11±1.66, and 5.79±2.36. The shade guide did not match well with the color space of the human teeth. Especially, the lacks of the Yellow-red Hues and higher values were prominent. Compare with other measurements, the Hues of the teeth measured in this study were broadly distributed(most of ranges in Y and YR were included), while the Value and chroma were shown to the lower.