라이너가 필요 없는 주조 링의 주조성 평가

배지명 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

Ring liner allows the radial expansion of investment during setting, hygroscopic, and thermal expansion in casting ring. However, ring liner has been reported to be harmful to the health of human and environment. The aim of this study was to develop a new casting ring which does not require liner and to compare the casting accuracy of new casting ring with those of conventional casting ring. It was classified into five groups: conventional casting ring with and without liner, experimental casting rings with 11 mm holes, with medium square(11×41 mm) openings, and with large square(27×41 mm) openings. Each group was composed of 10 specimens. After wax patterns were made on a prefabricated metal die for crown, they were invested with gypsum-bonded investment(Cristobalite inlay investment, Whip Mix, U.S,A.). For metal, NPG^(TM)(Aalba Dent Inc, U.S.A.) was used for casting using centrifugal casting machine. The casting body was adapted to the original metal die and the marginal gap was checked by a light microscope after loading 1 kg for 10 seconds. The results were confirmed by SEM observations and analyzed statistically by Kruskal-Wallis Test(P=0.01) and Duncan's multiple range test. In the experimental casting rings, the bigger the openings of casting rings, the more accurate the casting bodies became(P<0.01). The experimental casting ring with medium and large square openings showed the comparable casting accuracy to the conventional casting ring with liner(P<0.01). Accordingly, newly developed casting rings with medium and large square openings are supposed to be used without liner clinically.

상아질 접착제의 중합 시간 조절에 따른 복합레진의 중합 수축 방향의 변화

배지현,오명환,김창근,손호현,엄정문,조병훈,권혁춘 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4

The purpose of this study was to evaluate the effect of adhesive curing timing on the direction of polymerization shrinkage of light-curing composite resin. In this study, the curing times of adhesive and composite resin were measured by differential scanning calorimeter(DSC). 28 extracted human molars were embedded in clear resin and box-type cavities were prepared. Based on DSC data. the experimental teeth were divided into 4 groups. Group 1: no bond: Group 2: late curing: Group 3: Intermediate curing: Group 4: Early curing. After treating with adhesive, the buccal cavities were filled with Z-100 hybrid composite resin and the lingual ones were filled with AEliteflo flowable composite resin. The depressions at the surface were measured by surface profilometer, then the specimens were embedded in clear resin and sectioned. Impressions were obtained and used to get epoxy resin replicas. The epoxy replicas were gold-coated and observed under SEM. Average Maximum Gap(AMG), Gap Proportion(GP), Average Marginal Index(AMI) were used to compare the shrinkage gap of each group. The results were statistically analyzed using the Kruskal-Wallis One Way ANOVA, Student-Newman-Keuls method. The results of this study were as follows. 1. Average Maximum Gap. Gap Proportion, Average Marginal Index and depression at the surface of Z-100 hybride composite resin were smailer than those of AEliteflo flowable composite resin(P(0.05) 2. When the bonding between composite resin and tooth structure was strong, the shrinkage gap was small, and depression at the surface was deep(P<0.05). 3. In the well-bonded group. light-curing composite resin shrank toward bonded cavity wall. not toward light source. The result suggested that the direction of polumerization shrinkage was affected by the quality of bonding in the dentin-resin interface. The strong was the bonding between composite resin and tooth structure, the smaller was the gap and the deeper was the depression at the surface. Then the flow to compensate the polymerization shrinkage proceeded from surface to bonded cavity wall.

가속시효와 착색에 의한 복합레진의 색변화

배지명,김광만,김경남 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1

The colors of composite resins are changed with time due to intrinsic and extrinsic factors. This study was aimed to characterize the effect of each factor. Specimens(dia.15mm×thic.2mm) were prepared from Z-100(ZH), Aelitefil(AF), Photo Clearfil Bright(PF), Bisfil-2B(BF) and Clearfil FⅡ(CF). One group of samples was exposed to a xenon arc of 1,000W with a total dose of 410kJ/㎡ for 228hrs in a weathering chamber and then immersed in filtered coffee for 7 days. The other group of samples was immersed in coffee first and then exposed to the xenon arc. The color were measured before and after each treatment with a spectrophotometr according to the C.I.E. L*a*b* color system. Ra values of surface roughness, contact angles and SEM observations before and after accelerated aging were compared. Results were as follows : 1. In the accelerated aging and subsequent staining group, the color changes of AF and PF after aging and all materials after subsequent staining, were greater than the upper limit of acceptibility(ΔE=3.3). 2. In the staining and subsequent accelerated aging group, the color changes of BF after staining and AF and PF after subsequent aging, were greater than the upper limit of acceptibility. 3. AF and PF were sensitive to intrinsic factors, BF to extrinsic factors, and extrinsic factors were activated by accelerated aging in ZH and, CF. 4. The color changes by accelerated aging showed consistent results regardles of pre-staining while those by staining were affected by pre-aging. 5. Ra values of roughness after aging did not change significantly and had no relation to the color changes after aging and subsequent staining(P<0.05). 6. Though the contact angles of AF, BF and CF after aging were reduced significantly, they had no relation to the color changes after aging and subsequent staining(P<0.05). It was concluded that each of the discoloration features by accelerated aging and staining was detectable and could be clinically used by considering the characteristics of the materials which are sensitive to intrinsic and/or extrinsic discoloration factors.

포스트의 성분과 형태가 치아의 파절 저항성 및 파절 양상에 미치는 영향

배지명 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The aim of this study was to compare the fracture resistance and failure mode of natural teeth with endodontically treated teeth, with and without post systems that have different shapes and components. A total of 45 single rooted human incisors recently extracted within 2 weeks were divided into 9 groups, that were composed of natural teeth, endodontically treated teeth without post, and endodontically treated teeth with their crowns removed and restored with 7 kinds of different post systems. The root canal space and the residual tooth structure were treated with bonding agent, and all posts were cemented with dual-cured resin cement, followed by core build-up with light-cured translucent composite, except the cast posts. Each specimen was embedded in translucent acrylic resin with simulation of periodontal ligament and shear load was applied at 135-degrees angle to the long axis of the tooth using universal testing machine (Z020, Zwick), at a crosshead speed of 5 mm/min. The fracture resistances of 7 experimental post groups were applied to about 51-66% of that of natural teeth group. The highest fracture resistance was recorded for cast post and Para post among the groups restored with post and core (P<0.01). In failure mode, C-post, and FRC Postec showed favorable aspects by both naked eye and SEM observations.

중합방법에 따른 레진과 콤포머의 FTIR을 이용한 중합도 측정

배지명,김광만,김경남,김호철 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.2

The degree of conversion(DC) of composite resins are closely correlated with the mechanical properties. Fourier Transform Infrared(FTIR) Analysis is currently used to determine the DC for many advantages. In this study, three composite resins ; Aelitefil(AF; U.S.A.), VeridonFil-Photo(VF; Korea), Z-100(ZH; U.S.A.) and two compomers; Compoglass(CG; Lichtenstein), Dyract(DR; Germany) were used to make specimens with thickness of 0.1 ±0.02㎜. After one group of samples were light-cured for 20 second and those of the other group were Argon laser-cured with 0.23W continuous mode for 5 second, all the samples were kept dry at 37℃ for 24h. From the spectra acquired on an FTIR spectrometer(Bruker IFS 88, Germany), the aliphatic C=C absorbance peak at 1640㎝-¹ and the N-H reference peak at 3380㎝-¹ were measured using a standard baseline technique. The ratios of absorbance of C=C/N-H before polymerization to that of C=C/N-H after polymerization were used to calculate the residual C=C bonds. The results were as follows ; 1. The descending order of the degree of conversion was VF>AF>ZH, CG>DR in light cured group(p<0.05). 2. The descending order of the degree of conversion was VF>AF>CG>ZH, DR in laser cured group(p<0.05). 3. The degree of conversion of light-cured group was higher than laser-cured one only in ZH and not significantly different in other materials(p<0.05). In conclusion, the argon laser showed efficient curing capacity compared with light curing unit except ZH and the degree of conversion of compomer was inclined to be lower than that of composite resin.

정수공정에서 이취미물질 제거에 관한 연구

김지태,한명애,곽현,배성렬 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1

이취미물질중에서 페놀, Geosmin, 2-MIB를 선정하여 응집제(PACS)와 흡착제(PAC) 및 산화제(Cl2, ClO2)로 처리하였을 때 제거율을 알아보았다. 페놀의 경우 이산화염소(ClO2)와 분말활성탄(PAC)으로 처리하였을 때 제거효율이 높았고, Geosmin과 2-MIB는 분말활성탄(PAC)으로 처리하였을 때 제거효율이 높았다. 그러나 페놀, Geosmin, 2-MIB 모두 응집제(PACS), 염소(Cl2)로 처리하였을 경우에는 제거효율이 거의 없음을 알 수 있었다. The removal ratio of phenol, geosmin, and 2-MIB selected in odor and taste causing materials was investigated, when water was treated with coagulant(PACS), adsorbent(PAC), and oxidants(Cl2, ClO2). Phenol was removed at a relatively higher rate by the treatment with CIO2 and PAC(Powder Activated Carbon). The other side, geosmin and 2-MIB were removed at a higher rate by the treatment with PAC. But it was found that the treatment with coagulant(PACS) and chlorine(Cl2) for the removal of phenol, geosmin and 2-MIB was little removal efficiency.

폴록사머 및 프로필렌글리콜을 이용한 클로트리마졸 고형 좌제의 물리화학적 특성

현경희,오유경,김정애,공경환,김지현,양준호,배명수,김호동,이종달,장현욱,용철순,최한곤 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.2

To develop a clotrimazole-loaded solid suppository with poloxamer and propylene glycol, the melting points of various formulations composed of poloxamer 188 (P 188) and propylene glycol were investigated. The dissolution study of clotrimazole delivered by the suppository composed of P 188 and propylene glycol was performed. The mixtures composed of P 188 and propylene glycol were homogeneous. Propylene glycol affected the melting points of poloxamer mixtures. In particular, the mixture [P 188/propylene glycol (70/30%)] with the melting point of about 32°C was a solid form at room temperature and instantly melted at physiological temperature. Furthermore, propylene glycol affected greatly the dissolution rates of clotrimazole from the suppository. Dissolution mechanism analysis showed the dissolution of clotrimazole was proportional to the time. Our results indicated that the solid suppository with P 188 and propylene glycol would be a candidate of rectal dosage form for clotrimazole.

조릿대 추출물 발효액의 항균 및 항혈전능 검색

구명화(외 2명) 신라대학교 (부산여자대학교) 2015 論文集 Vol.60 No.-

초경 시작 시기가 여성 정신분열병 환자의 병의 경과에 미치는 영향

김진훈,윤선욱,배명지,임선진,정은기,장동원 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.5

Objectives : The protective effects of estrogen against the development of schizophrenia have been investigated in various perspectives, Previous studies showed patients with earlier age of menarche had later onset of schizophrenia and less frequent admissions. This study was performed to evaluate the effect of the age of menarche on subsequent courses including hospitalizations, suicidal attempts, Physical harm to others, and psychotic symptoms in women with schizophrenia. Methods : Self-report menarche age, onset of psychotic symptoms, and clinical status were collected in a sample of 108 Premenopausal women with the diagnosis of schizophrenia. Results : There was significant correlation between the age of menarche and the frequency of admissions (r=.321, p=.006). Also, Patients with history of physical harms to others showed later age of menarche than those without (t=2.025, df=106, p=.045). Conclusion : In women with schizophrenia, the age of onset of menarche affects subsequent courses indicated by frequency of admissions and violent behaviors. It is suggested that identifying the age of menarche might be helpful to predict the courses in women with schizophrenia. Further investigations regarding the relationship between estrogen and the courses of Schizophrenia in women are needed.

Tourette 장애 소년에서 자기공명영상을 이용한 기저핵의 용적 분석

선우영경,신용범,이명지,김지영,배재남,강민희,김철응,이정섭 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.4

Objectives : The purpose of this study was to investigate the regional differences of the basal ganglia volume between the boy subjects who have Tourette's disorder and the control group who don't have this disorder by using Brain MRI. Methods : Sixteen subjects who were diagnosed as Tourette's disorder using DSM-IV criteria, and sixteen healthy subjects were selected. For analysis the coronal slice images of the basal ganglia were collected and collected MR images were analyzed with NIH Image (version 6.1 ppc). Resuls : The total brain volume in the subjects with Tourette's disorder were smaller than control group by 6.2% (F=6.2, d.f.=1, P=0.019). The right putamen volume in boys with Tourette's disorder were significant smaller than control group statistically (F=3.2, d.f.=3, P=0.040). The asymmetry (1eft>right) in the globus pallidus decreased significantly in the boys with Tourette's disorder (p=0.06) were found from this experiment. Conclusion : These findings suggest that boys with Tourette's disorder may have neuropathological abnormalities in the basal ganglia. Moreover, the present findings point out the important role of basal ganglia, especially putamen, in Patho-physiology of Tourette's disorder. More studies about the structural and functional analysis of the basal ganglia in Tourette's disorder are highly required.