심미보철(審美補綴) 제작(製作)에 관계(關係)되는 심미적(審美的) 요소(要素)에 관(關)한 연구(硏究)

정인성,Chung, In-Sung 대한치과기공학회 1996 대한치과기공학회지 Vol.18 No.1

The esthetic factor for the esthetic prosthesis were studied on 300 persons. The praaticipants were 150 students registered under the Deparment of Dental Laboratoy Technology, Jisan Junior College at the present day of June, 1995 and their mothers. The results were as follows; 1. The number of persons with 28 teeth in their oralcatity was highest(P<0.01). They complained that they have only 28 teeth bacaues of the loss(deficiency) fo teeth due to their impacted teeth and dental caries. 2. The presons with feelings of dissatisfaction were large in number(P<0.01). They were dissatisfied with an abnormal tooth form(33.5%), tooth position(31.7%), tooth color(31.1%), and tooth size(3.7%) in order(P<0.01). 3. In their facial form, the most numerous were men with square form and women with ovoid form(P<0.01). Among the whloe number fo facial forms it appeared to decresae in the order of ovoied(41.8%), square(32.7%), square+tapered(20.5%), and tapered form(5%)(P<0.01). In a profile form, the most numerous were men with A form and women with B. Among the whole participants the most numerous were persons with B form and persons with A and C form were next in oder of numbers(P<0.01). 4. In discoloration of teeth, the most numerous were persons who have no discoloration. 5. In the esthetic recovery of anterior prosthesis the color matching of proximal teeth was not correct, but the outline of proximal teeth was to be reproduced correctly. 6. In the diastema of teeth, the number of persons who have no diastema was higher than that of persons who have a disatema(P<0.01) Among the persons who have diastema the most numerous were persons who have a diastema, and next were 2, 4, 3 and 5 diastemas in order. 7. In a meeting point of the midline of the body and the tooth the number of person hanving a meeting point was higher than that of persons who did not fit each other(P<0.01). The bias direction of midline teeth appeared to be affected by chewing direction, prosthesis location, and posterior location. 8. The length and width of teeth in the tooth size were suitable(P<0.01). The number of persons who have central teeth longer than lateral teeth was high(P<0.0). 9. In the results of smile analysis, the line form connected with incisal edge of upper canine were parallel(P<0.01). When smile the location fo upper lips should be in accord with the central area of teeth(P<0.01) and lower lip should be atteched to the edge of anterior teeth in order to be esthetic. 10. Among the number of upper teeth we can see the most numerous were 8 teeth and next were 10, 6 and 12 in order.

구강인기법과 왁스블록의 종류에 따른 금속 코핑의 변연적합도 비교

정인성,김원영,전병욱,Chung, In-Sung,Kim, Won-Young,Jeon, Byung-Wook 대한치과기공학회 2020 대한치과기공학회지 Vol.42 No.3

Purpose: We investigated the marginal fit between abutment and metal copings according to impression technique, wax block types, and metal types. Methods: We selected the traditional impression method of using rubber impression materials and the digital impression method of using oral scanners, three types of wax blocks, and two types of metal, both of which were domestically and commercially available, were selected to produce metal copings, and the marginal fit was determined through the use of silicon replication. Results: The measurements of axial wall fit revealed that the IYV specimens had the best fit, with a mean gap of 24.11±5.95 ㎛, followed by CEV, CHV, CSS, CSV, CES, CHS, and IYS specimens (mean: 33.44±8.41 ㎛). The differences were not statistically significant. The marginal gap measurements showed that the CEV specimen had the smallest gap, 17.25±4.13 ㎛, followed by the CSV, CHV, CSS, CES, CHS, IYV, and IYS specimen (mean: 43.47±15.63 ㎛). The differences were statistically significant. Conclusion: The axial wall fit of the metal coping (VeraBond2V; Aalba Dent, Inc., Fairfield, CA, USA) produced by the lost wax technique with the traditional impression method was excellent. The marginal fit of the metal coping (VeraBond 2V) produced by wax milling with the use of an oral scanner was also excellent. The marginal fit of the metal coping was within the clinically acceptable limits in all groups.

가토측뇌실내(家兎側腦室內) Guanethidine의 혈압작용(血壓作用)

정인성,Chung, In-Sung 대한약리학회 1965 대한약리학잡지 Vol.1 No.1

Rabbit blood pressure showed gradual fall by intraventricular guanethidine (5mg). The pressure rise by carotid occlusion was markedly inhibited or abolished by the guanethidine, while it was enhanced by small dose (2mg). The intraventricular guanethidine did not affect norepinephrine pressor effect, but caused marked inhibition or abolishment of depressor action of serotonin.

-금속(金屬) 표면처리방법(表面處理方法)에 따른 비귀금속합금(非貴金屬合金)과 도재(陶材)와의 결합강도(結合强度)에 관(關)한 실험적(實驗的) 연구(硏究)-

정인성,Chung, In-Sung 대한치과기공학회 1989 대한치과기공학회지 Vol.11 No.1

This investigation was performed to evaluate the effect of four different preteatment techniques on the bond strength of porcelain to non-precious metal alloy. Samples of total of 40 were divided into 4 groups according to the 4 variables which included the 50$\mu$alumina oxide air abrasion, method, the as retention bead method, the L-retention bead method, the Etching method. The completed metal-porcelain samples were compressed in Instron loading machine until gross fracture occured to examine the effect of the complex variables on the bond strength of porcelain to non precious metal alloy. The result obtained were as follows : 1. The difference of bond strength according to four different pretreatment techniques was statistically significant(p<0.01). 2. The difference of bond strength between the ss-retention bead method and the L-retention bead method was not significant statistically(p>0.05) 3. The difference of bond strength between the retention bead method and the etching method was statistically significant(p<0.01). 4. The difference of bond strength between the retention bead method and the 50$\mu$alumina oxide air abrasion method was statistically significant(p<0.01). 5. The difference of bond strength between the etching method and the 50$\mu$alumina oxide air abrasion method was statistically significant(p<0.01).

인공치관용(人工齒冠用) Glass-Ceramics의 결정화(結晶化)에 관(關)한 연구(硏究)

정인성,Chung, In-Sung 대한치과기공학회 1992 대한치과기공학회지 Vol.14 No.1

Glass ceramics for crown were prepared by adding 3$\sim$11 wt% TiO2 to the weight percent composition of 34.7 CaO, 27.8 SiO2, 18.3P2O5, 12.6MgO and 6.6 TiO2. The starting glasses were prepared by melting the powdered batch in alumina crucible at 1350$\sim$1400 for 1 hr and then quenching into a distilled water. The nucleation and crystallization of the crystalline glass ceramics for crown were studied by DTA, SME and X-ray diffraction analysis. Frit containing 9.11 wt% TiO2 had crystallization temperature of 850$\sim$1075 and major crystalline phase was identified by X-ray diffraction as diopside(CaO-MgO-2SiO2). Activation energies for the crystallization processes were obtained from DTA by varing rates for the fits, and were calculated from modified Ozawa and Kissinger equations. Activation energy for the crystallization processes of the S-4 frit was 489.6 KJ/mol.

부산지역(釜山地域) 치과기공사(齒科技工士)의 보수교육(補修敎育) 개선(改選)에 관(關)한 조사연구(調査硏究)

정인성,Chung, In-Sung 대한치과기공학회 1990 대한치과기공학회지 Vol.12 No.1

The study objected to the 120 persons out of 360 persons who have registered under the association of the dental technicians in Pusan to grasp contents about improvement of life long education of the present day of November, 1987, and its results, which we have acquired by this study were as follows : 1. A sense of satisfaction toward the system of life long education appeared as unsatisfaction and its unsatisfaction decreased from the rate of member's attendance or exam. marks, the contents of education, and place of education. 2. The problem of the exam. mark which derived by the presence by the substitute appeared which 46.7 percent(56 persons), lack of opportunity for the recompletion at branch association appeared which 19.2%(23 persons), given 4. exam. marks at the over all scientific contest was appeared 14.2 percent(17 persons), relation which legal treatment when ones didn't completed exam. mark was appeared 10.8 percent(13 persons) and lastly, appeared 8.3 percent (10 persons) with time of delivery of the exam mark card. 3. The frequency of the opening for the life long education which related with the rate of members attendance was fixed as nowadays two times per annually, but they perferred the opening per academic blanch once out of the firest half year and the latter half of the year and, they liked the openings at the first week or second week and preferred the holding on saturdays and sundays. 4. The subject of the life long education have appeared the opinion that the thesis was lop-sided toward the allocation of time schedule of lecture appeared the opinion of which they perferred the rate of an hour of cultural subject and two hours of major studies, and invitation for an instructor they preferred one dentist, one member, one dean for the cultural subject, and there are lots of opinions which they wished display of materials. 5. A sence of satisfaction about the place they perferred was decreased such as ; an auditorium concerned of the colleges was 46.7 Percent(56 Persons), hotels 26.7 Percent(32 Persons), an auditorium of the general hospital 20 percent(24 persons) 6. And lastly, there are lots of opinions who have required the necessities to constitute for the academic branch.

Influencing Factors that Affect the Biological Monitoring of Workers Exposed to N,N-Dimethylformamide in Textile Coating Factories

정인성,김종환,최상국,배종연,이미영,Chung, In-Sung,Kim, Jong-Ghan,Choi, Sang-Kug,Bae, Jong-Youn,Lee, Mi-Young The Korean Society for Preventive Medicine 2006 예방의학회지 Vol.39 No.2

Objectives : The objective of this study is to assess the factors influencing biological monitoring of textile coating factory workers exposed to N,N-dimethylformamide(DMF). Methods : We studied 35 workers who were occupationally exposed to DMF from 9 textile coating factories. The study was carried out in two phases; summer and winter. While air concentration of DMF, temperature and humidity were assessed in order to monitor the atmospheric conditions, biological monitoring was done to determine the internal dose by analyzing the N-methylformamide(NMF) collected from urine at the beginning and end of the shift. Questionnaires and medical surveillance were also obtained during the two phases. Results : Median air concentrations of DMF in winter and summer were 1.85 ppm and 2.78 ppm respectively. Also the difference between the urinary NMF concentration at the beginning and end of the shift $({\Delta}NMF)$ was always significant in each season (P < 0.001). The correlations between log DMF in air, log end-of-shift urinary NMF (r=0.555, P < 0.001) and log ${\Delta}NMF$ (r = 0.444, P < 0.001) was statistically significant in summer. The temperature, humidity, a shift system and different styles of clothing worn were significantly different during the two phases. In a multivariate analysis, temperature and the concentration of DMF in the air were the main factors influencing biological monitoring of textile coating factory workers. Conclusions : Concerning more comprehensive prevention measures to reduce exposure for those workers occupationally exposed to DMF, dermal exposure conditions such as temperature and humidity together with the air concentration of DMF should be assessed and biological monitoring is necessary to reduce adverse health effects, especially during the summer.

치과기공사(齒科技工士)의 국가실기시험(國家實技試驗) 개선(改善)에 관(關)한 연구(硏究)

정인성,Chung, In-Sung 대한치과기공학회 1994 대한치과기공학회지 Vol.16 No.1

The study objected to the 36persons out of 55 persons who have registered under the association of the professor of department of Dental Laboratory Technology to grasp contents of May, 1992, and objected to the 74persons out of 100persons who have registered under the association of an a lumni of Department of dental Laboratory Technology, Jisan Junior college to grasp contents about improvement of dental laboratory technology, Jisan Junior College to grasp contents about improvement of the national practical examination in the dental technician of the present day of May, 1994 and its results which we have acquired by this study were as follows : There are lots of opinions who have required the necessities to enforce for a national practical examination in the dental technician. A sense of satisfaction forward the system of a national practical examination in the dental technician appeared as unsatisfaction and it's unsatisfaction decreased from evaluation me operation method, the makes of questions, selection of a markers, distribution of marks of a practical examination. The operation method of a practical examination have appeared the opinions which they wished the present system. A date of operation a practical examination have appeared the opinion of which they preferred late in February. The distribution of marks of a practical examination have appeared the opinions which they wished the present system. The problem of the makes of questions of carving test which derived by an out flow of cast appeared which 52.7 percent(58 persons), lack of objectivity and lack of a standard evaluation appeared which 40 percent(44 persons), and lastly appeared. 5.5 percent(6 persons) with partiality of a questions. The problem of the makes of question of Q-test which derived by lack of a standard evaluation appeared which 44.5 percent(49 persons), lack of objectivity appeared which 39.1 percent(43 persons).

재경장치에 관한 연구 - 인삼발 ( 염 (廉) ) 제조기의 설계에 관한 연구 -

정인성(Chung In Sung) 전북대학교 공학연구원 (구 전북대학교 공업기술연구소) 1973 工學硏究 Vol.1 No.-

구강인기방법과 블록 종류에 따른 지르코니아 코핑의 변연적합도 비교

정인성(In-Sung Chung),전병욱(Byung-Wook Jeon),김원영(Won-Young Kim) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.1

구강인기방법과 지르코니아 블록 종류에 따른 지르코니아 코핑의 변연적합도 변화를 관찰하기 위해 2종의 고무인상재와 1종의 구강스캐너를 사용한 구강인기방법과 3종의 지르코니아 블록을 사용하여 지르코니아 코핑을 10개씩 제작하여 표면 거칠기와 변연적합도를 측정하였다. 표면 거칠기는 LUXEN Smile(2.3±0.9㎛) 블록이 가장 우수하였다. 그리고 협측 변연간격은 HL시편(26.5±2.1㎛), 설측 변연간격은 HL시편(27.2±2.1㎛), 근심 변연간격은 HJ시편(29.6±4.0㎛), 원심 변연간격은 HJ시편(29.0±3.0㎛)이 가장 낮게 나타났으며, 통계학적으로 유의차가 있었다(p<0.05). 이 결과, 구강인기방법과 지르코니아 블록 종류가 변연적합도에 영향을 준 것으로 나타났으며, 변연간격은 모든 군에서 임상적 허용 범위 내에 속했다. The purpose of this study was to compare of marginal fitness of zirconia copings according to impression techniques and zirconia blocks. For the conventional impression, two types of rubber impression materials were used and digital impression was made by using an intraoral scanner. Zirconia copings were manufactured from three types of blocks. With each of ten zirconia copings was determined by surface roughness and marginal fitness. For surface roughness, LUXEN Smile(2.3±0.9㎛) block was superior. And the lowest mean values and standard deviations of marginal gap for the HL specimens were 26.5±2.1㎛ for buccal, 27.2±2.1㎛ for lingual, and that of the HJ specimens 29.6±4.0㎛ for mesial, 29.0±3.0㎛ for distal. One-way ANOVA showed statistically significant difference between groups for marginal fitness(p<0.05). From the above results, the impression techniques and zirconia blocks had influence on marginal fit of the zirconia copings. Also the marginal fitness of all groups showed clinically acceptable range.