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      • KCI등재

        겔라틴化된 감자 澱粉의 리올리지 特性

        張榮一,張奎燮,朴榮德 충남대학교 농업과학연구소 1991 농업과학연구 Vol.18 No.1

        Rheological properties of gelatinized potato starch were investigated with Brookfield wide-gap viscometer at various conditions. The gelatinized potato starch at 3-7% showed a pseudoplastic behavior with yield stress, and presented thixotropic properties with time-dependent structural decays. The consistency index and yield stress of gelatinized starch were proportional to starch concentration but inversely proportional to measurement temperature, and the flow behavior index did not show constant relationship. The consistency index and yield stress of the gelatinized starch on addition of phosphate decreased as the flow behavior index increased. The values of activation energy at a, and equilibrium were 1.52 ㎉/g.mole and 1.27 ㎉/g.mole, respectively.

      • SCOPUSSCIEKCI등재

        顔骨格型과 咬合과의 相互關係에 對한 硏究

        張英一 대한치과교정학회 1982 대한치과교정학회지 Vol.12 No.1

        This study was undertaken to document relations between facial skeletal pattern and dental occlusion. The data in this study were collected from pretreatment cephalometric radiographs and study models of patients' records present in the files of Orthodontic Department, Seoul National University Hospital. Patients were selected on the basis of a mandibular plane-sella nasion angle equal to or greater than 38°(high SN-MP angle) or equal to or less than 26°(low SN-MP angle). Patients in the mixed dentition and with missing permanent teeth were excluded for ease of assessing tooth size / arch circumference relationships and then 30 high SN-MP and 11 low SN-MP patients were selected among them. The mean age of these two groups of patients was high SN-MP, 12.8±1.23 years and low SN-MP, 13.0±1.48 years. The following conclusions were obtained. 1. In the maxilla and mandible the mean tooth size of high SN-MP patients was nearlly identical to the low SN-MP patients. 2. The mean maxillary arch circumference was increased in low SN-MP group compared with high SN-MP group and a smilar, but smaller, mean increase was present in mandible. 3. The difference between the mean maxillary circumference required and the mean maillary circumference present ranged from-4.8mm in th high SN-MP group to-1.3mm in the low SN-MP group. A small range of means occurred in the mandible (high SN-MP:-4.0mm to low SN-MP:-1.8mm). 4. In the maxilla and mandible the mean arch length was nearly identical in the high and low SN-MP groups. 5. The mean incisor inclination was increased as the SN-MP angle decreased in the maxilla and mandible. 6. The mean distance of the maxillary first molar from anterior border of the pterygomaxillary fissure was nearly similar between high and low groups. 7. The mean mandibular intermolar width was increased from high SN-MP to low SN-MP patients.

      • SCOPUSSCIEKCI등재

        교정 진단을 위한 피개교합심도지수 (Overbite Depth Indicator,ODI)의 새로운 평가

        양원식,김태우,장영일 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.1

        Since 1984, many patients have been treated with Multiloop Edgewise Archwire(MEAW) Technique and diagnosed with ODI(Overbite Depth Indicator) and APDI(Anteroposterior Dysplasia Indicator) by the authors. 234 samples of them were selected randomly for the statistical analysis(age, sex, Angle's classification, treatment period,, extraction, ODI etc.). Especially, ODI was analysed statistically and its application methods were reviewed. The results ad conclusions were as follows: 1.On the 150 patients with normal overbite, the mean values of Class Ⅰ,Ⅱ,Ⅲ malocclusion were 67.5。, 72.2。 and 59.0。. They were significantly different on the level of p<0.01. 2.In normal overbite samples, ODI decreased with the increase of APDI and the correlation coefficient was - 0.54.It seems that this result reflects the characteristics of AB to mandibular plane angle. 3.The regression equation was Y=-0.57X+114.64, where X is APDI and Y is ODI. In cases of small or large APDI, it seems to be absurd that the patient's ODI is compared with the mean ODI to differentiate diagnostically the open bite or deep bite tendency from the normal.

      • SCOPUSSCIEKCI등재

        발치지수(Extraction Index) 기준에 관한 두부 방사선학적 연구

        신수정,장영일 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.4

        부정교합을 치료하기 위해 영구치 발거여부를 결정하는 것은 교정학의 역사상 커다란 논쟁거리였고, 따라서 진단과정에서 사용되는 많은 분석법들과 발치의 기준들이 제시되었다. 이제까지 제시되어 온 발치기준들(Extraction formulas)을 검토해 보면, 치열궁 장경 부조화, 치열의 전방돌출, 그리고 환자의 골격형태에 기초하여 발치를 결정함을 알 수 있다. 이들 중에서 가장 중요하게 고려되어야 할 진단요소는 환자의 골격형태로, 결국 개개 환자의 부정교합은 그 환자의 골격형태 범위 내에서 치료되어야 하기 때문이다. EI(Extraction Index)는 환자의 골격형태를 감별진단 할수 있는 CF를 기본으로 구성되어 있고, CF는 부정교합의 수직적, 수평적 요소를 감별해내는 ODI와 APDI로 이루어져 있다. 또한 EI에는 환자의 안모에 영향을 미치는 절치간 각과 입술의 전후방 위치가 포함되어 있어서 안모형태도 고려되어 있다. 본 여구에서는 정상 교합자로서 골격이 조화를 이루며 좋은 안모를 가지고 있고 교정치료를 받은 적이 없는 11.2-14.4세의 아동을 대상으로 하여 두부계측 방사선 사진을 분석하여 EI에 관련된 항목들을 측정한 결과, 다음과 같은 결론을 얻었다. 1. ODI는 73.5°, APDI는 82.8°, CF는 156.3°였다. 2. 절치간 각은 123.6°였다. 3. E-line에 대한 상순의 거리는 0.0mm, 하순은 1.4mm였다. 4. Extraction Index는 153.8였다. To extract or not to extract permanent teeth for the correction of malocclusion has been a great debate in the history of orthodontics, and there is a variety of analytic methods and criteria to aid in the diagnosis. Extraction formulas that has been presented are many analytic methods that depend on arch length discrepancy, dental prominence, and skeletal pattern of the each patient. Of these analysis, the most important diagnostic factor is patient`s skeletal pattern. Because the behavior of the dentition is closely dependent upon the skeletal pattern of each patient, dentition must be arranged within that person`s skeletal frame. EI(Extraction Index) is composed of CF, interincisal angle, and lip position. CF is made of ODI and APDI that differentiate vertical and horizontal component of the skeletal pattern. So, EI not only represents patient`s skeletal pattern, but also takes facial appearance into consideration. This study was undertaken to investigate EI and related cephalometric variables on the cephalogram of Korean adolescents which consisted of 153 persons with normal occlusion, harmonious skeleton and pleasing face. The following conclusions were obtained. 1. The mean value of the ODI is 73.5 °, APDI 82.5°, CF 156.3° 2. The mean value of the interincisal angle is 123.6° 3. The mean distance of upper lip to E-line is 0.0mm, lover lip to E-line is 1.4mm. 4. The mean value of the EI is 153.8°

      • SCOPUSSCIEKCI등재

        연조직 측모에 관한 분석

        장영일,최희영,신수정 대한치과교정학회 1995 대한치과교정학회지 Vol.25 No.5

        본 연구에서는 단정한 측모를 지니고 교합이 양호한 성인을 대상으로 몇 가지 연조직 분석을 시행하고, 이를 여러 다른 연구에서의 기준치와 비교하여, 향후 교정치료 계획시에 도움이 되고자 하여 시행하였다. 측모가 단정하고 교합이 양호한 성인 남, 녀 각 25명(총50명)을 대상으로 촬영한 측모 두부X선계측사진에서 연조직 측모의 각도, 거리 계측을 시행하여 facial convexity angle, nasolabial angle, H-angle, Z-angle, E-line to upper lip, lower lip과 Sn-Pog´to upper lip, lower lip에 대한 남녀의 평균과 표준편차를 구하였고, 국내의 다른 연구와 비교하여 다음과 같은 결과를 얻었다. 모든 항목에 대해 백인에 비해 전방 돌출된 안모의 특징을 보였으며, 국내의 다른 연구의 수치에 비해서도 본 연구의 표본의 안모는 전방 돌출되어 있었다. The purpose of this study to analyze characteristics of soft tissue profile in Korean young adults. The sample consisted of 50 young adults (25 males and 25 females) who had pleasing and normal occlusion. Soft tissue analysis (facial convexity angle, nasolabial angle, H-angle, Z-angle, E-line to upper lip, lower lip, Sn-pog´to upper lip, lower lip) was performed on lateral cephlograms. Mean and standard deviation was obtained. When compared by other studies, mean profile of this sample was relatively straighter and both the upper and lower lips was more protrusive.

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