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A Study on the Influence of Finishing and Polishing Methods on the Gap between Denture Base Resin and Soft Liner (의치의 마무리와 연마법이 의치상 레진과 연성 이장재 간의 공극에 미치는 영향에 관한 연구)

  • Jung, Seung-Hwan;Lee, Joon-Seok
    • Journal of Dental Rehabilitation and Applied Science
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    • v.24 no.4
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    • pp.325-335
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    • 2008
  • The junction between resilient denture liner and the denture base is difficult to finish and polish due to difference of the physical property of the materials. Gaps tend to be formed during finishing and polishing procedures. The purpose of this study was measuring the width of junctional gap between $Molloplast-B^{(R)}$ and denture base material after finishing and polishing procedure, and evaluating the effect of method and direction on gap width. $Molloplast-B^{(R)}$ was processed (according to the manufacturer's instruction) against Lucitone $199^{(R)}$ acrylic resin. 50 specimens were fabricated with a raised center section. All of specimens were examined and photographed with a stereoscopic microscope(x120), and the largest gap along the junction of $Molloplast-B^{(R)}$ and acrylic resin on each specimen was measured. One-way analysis of variance(ANOVA) and independent t-test at 95% confidence level were used to analyze the data and to compare groups. The results of this study were as follows. In comparison with finishing tools, the gap width was the largest in $Molloplast^{(R)}$-Cutter and the smallest in FSQ-cross cut bur. There was statistically significant difference between FSQ-cross cut bur and $Molloplast^{(R)}$-Cutter(p<0.05). There was no significant difference in gap width between the direction of polishing. The mean value of gap width was the smallest in case of no polishing, and the largest in case of polishing with pumice & tin oxide. There was statistically significant difference between pumice and pumice & tin oxide. From the results, it is concluded that the use of $Molloplast^{(R)}$-Cutter in clinic need serious consideration even though it has good cutting ability. Further careful study is needed for finishing and polishing methods for decreasing gap width in junction of two materials.

A STUDY OF THE VARIANCES IN PRE- AND POST-TREATMENT DENTAL ARCH SHAPES IN EXTRACTION AND NON-EXTRACTION CASES (발치 및 비발치 치료증례에서의 치료전후 치열궁형태의 변화에 관한 연구)

  • Han, Hong;Cha, Kyung-Suk
    • The korean journal of orthodontics
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    • v.21 no.1 s.33
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    • pp.223-238
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    • 1991
  • This study was carried out in order to findout the amount of tooth movement, the changes arch size and the changes in arch morphology following orthodontic treatment and to provide a guideline for to predict post-treatment arch morphology. The sample group for this study consists of 15 males and 22 females, totalling in 37 persons, who received orthodontic treatment at Orthodontic Department of Dankook Univ. Dental Hospital. They are classified into Extraction Class I treatment group (E I), Non-extraction Class I treatment group (N I), and Non-extraction Class III treatment group (N III), according to their pre-treatment malocclusion state and methods of treatment. Following conclusions and averaged dental arch form for each group were obtained by cephalometric linear measurements and dental arch measurements using pre- and post-treatment lateral cephalograms and plaster study models. 1. Intercanine width were reduced in max. of both EI and NI during the period of treatment, 2. Intermolar width were reduced in max. of EI and increased in max. of NI. Therefore although there was no difference between these two groups before the treatment, intermolar width of the max, of NI was wider than that of E1 after the treatment. 3. PMV-incisor distance and PMV-canine distance were decreased in both max. and mand. of EI and that of NI, during the period of treatment. PMV-molar distance was decreased in both max. and mand. of NI and in mand. of NIII. 4. Items that showed stability during the treatment were: max. & mand. PMV-molar distance, mand. intercanine and intermolar width in EI; mand. intercanine and intermolar width in NI; mand. & max. PMV-incisor distance, PMV-canine distance, max. PMV-molar distance and max. & mand. intercanine and intermolar width in NIII. 5. The differences in averaged canine and molar variances to post-treatment dental arch form were present only in EI and in NI. There was no variance between maxilla and mandible in each group.

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A Human Enginnering Study on an Original Pattern of Clothing for an Abnormal Type of Figure - with special reference to the of kyphosis - (이상체형의 의복원형의 인간공학적연구 - 척추만곡체형을 중심으로 -)

  • 박정순
    • Journal of the Korean Home Economics Association
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    • v.20 no.3
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    • pp.9-18
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    • 1982
  • In this study, we attempted to make an original pattern of clothing for an abnormal type of figure, especially for the type of kyphosis. We measured the curvature of the spine of a woman with kyphosis with a Martin measuring instrument and a silhouetter in the following ways. First, we counted the rate of shrinkage of the standard lines drawn on the surface of the body according as the body moved. Secondly, placing the front and back darts, the front and back shoulder darts and the side darts according to“Munhwa”pattern, we made cubic cuttings of four moving postures as well as the standing one. Thirdly, we superposed the developed patterns of the standing and the moving postures, measuring the position change and the amount of the chaange of the darts, and compared them. The results are as follows: 1) In the developed pattern of a cubic cutting of the basic pattern and the standing posture, the neckhole became larger than that of the basic pattern, and the waist line was lowered than that of the basic pattern because the center back line was shortened due to the curved backbone. 2) As for the change of the standard line according to the movement, we found that the waist line, the center front line, the center back line, the bust width line, the upper back width line and the back width line became longer. Special consideration must be given to the function of the clothing for an abnormal type of figure. 3) The difference of the measurements between the cubic cutting and the body measurement regardless of the body movement is due to a gap by an acute angle at the jutted place between the developed pattern and the body surface. We found that the body measurement of the upper back width line, the back width line and the bust line became larger. Consequently, in making an original clothing pattern, it is desirable that we must not place the front and the back waist darts at the jutted place on the back from the functional and the aesthetic viewpoint of clothing. It is also desirable that we must widen the neckhole because the shoulder angle is close to a straight line due to a jut of the upper back width line.

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A Study on Body Proportion Characteristics of Middle Aged Women with Their Body Cathexis and Fit Satisfaction (중년여성 신체비례적 특성과 그에 따른 신체만족도와 착의만족도에 관한 연구)

  • Moon, Nam-Won;Wee, Eun-Hah;Park, Woo-Mi
    • Journal of the Korean Society of Clothing and Textiles
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    • v.32 no.5
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    • pp.821-833
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    • 2008
  • The purpose of this study is to provide basic information about body proportion characteristics, and the level of body cathexis and fit satisfaction related to those characteristics. It is hoped that this will help to improve ready-to-wear satisfaction in middle-aged women. In order to achieve this purpose, the body proportion characteristics of middle-aged women were measured and were compared with that of standard and ideal body types. Then, the body cathexis and fit satisfaction according to these characteristics was analyzed. Finally, the following results were obtained. First, the average height of middle-aged women was 6.87 head, waist length was 58.9% of height, and knee length was 25.6% of height. In frontal appearance, the hip width, shoulder width, and chest width were wider than waist width(24%, 20%, and 11% respectively). Chest and hip depths was thicker than waist depth(19% and 17% respectively). Second, in lengths proportion, their lower body was shorter than the standard body shape for women in their 20s'. Also the difference between the width of frontal appearance and depth proportion of side appearance was small, suggesting a more slender silhouette among the middle aged women. Finally, middle-aged women who were not wide or big in the chest had higher satisfaction with their bodies. As shoulder width and chest depth became small, the fit satisfaction of upper clothes increased. While longer lower body had higher fit satisfaction with pants crotch, shorter lower body had higher fit satisfaction with waist and abdominal parts.

A Study on the Satisfaction/Dissatifaction with the Fit of Ready-to-Wear Clothing Based on Middle Aged Women's Body Shapes (중년여성의 신체 형태 특징 유형별 기성복 만족도)

  • Park, Woo-Mee;Wee, Eun-Hah
    • Fashion & Textile Research Journal
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    • v.5 no.3
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    • pp.235-243
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    • 2003
  • This study is to figure out where the current satisfaction with ready-to-wear clothes based on middle-aged women's body shapes is at and to propose basic considerations in its production for coming up with a better sizing system to maximize customer's satisfaction. The data obtained from measurement and questionnaire by 126 middle- aged (35-59) women which were located in Gwangju. Followings are summary of this research, 1)The satisfaction level with lower -wear is relatively lower-wear than that of upper-wear in most parts of body. 2) The results by way of putting score show three different groups. Group 1 has characteristics of front body silhouette in the small ratio of shoulder width/bust width, shoulder width/waist width and big ratio of shoulder width/hip width. And Group 3 has characteristics of front silhouette, small ratio of hip girth/thigh girth. Group 2 has a standard shape. 3) The satisfaction level with lower-wear based on middle-aged women's body shapes shows slight difference. In this category, Group 2 has higher satisfaction level than that of Group 1, while Group 1 has better shape than Group 3. 4) The items of clothes which should be considered current less satisfaction on their size and pattern are skirt and pants. In the meantime, specific body parts for the same criteria are hip girth, thigh girth. And the 43.7% of middle-aged women who responded to this study requires improvement on the fit of lower-wear.

A Study of the Development of Formal Pants Patterns for Women in Their 20s and 30s with Lower-body Obesity (20~30대 하체 비만형 여성을 위한 정장 바지 패턴 연구)

  • Ha, Hee-Jung
    • The Research Journal of the Costume Culture
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    • v.19 no.4
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    • pp.820-835
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    • 2011
  • The purpose of this study is to provide a basic pattern to assist in the development of formal pants that reflect the physical characteristics of women with lower-body obesity. The subjects selected for this study were women in their 20s and 30s with a Rohrer index of 1.6 or higher, a waist circumference 78.5cm to 83.5cm, and a lower drop of at least 18cm. The experimental pants patterns were developed by varying the waist line position, the waist ease, the ease in the hip area, the crotch length, the front and rear crotch width, the leg width, and the total length. Data analysis was performed using the SPSS statistics program(version 18.0). To verify the difference, this study used a variance analysis and Duncan's test. The conclusions drawn by the study are as follows. To reflect the form element of an abdomen with fatty deposits, the waist circumference should have an ease of 2cm. The front waist result was W/4+0.5cm+0.75cm and the rear waist result was W/4-0.5cm+0.25cm. The hip circumference showed a total ease of 4.5cm. The front hip result was H/4+0.75cm and the rear hip result was H/4+1.5cm. The crotch width set to H/16-1cm and the applied rear crotch width was H/16+2cm. The rear hip area was given more ease to reflect the protrusion of the hip. Along the line extending from the knee area to the crotch line, the outer seam line was designed with a gradual S-shaped curve to accommodate the protrusion from the maximum thigh width.

Comparison of Treatment Plans with Multileaf Collimators of different Leaf Width (Leaf width가 다른 다엽 콜리메터에 의한 치료계획 비교)

  • Kim Joo Young;Park Sung Yong;Lee Doo Hyun;Lee Seok Ho;Kim Tae Hyun;Cho Kwan Ho
    • Progress in Medical Physics
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    • v.15 no.4
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    • pp.173-178
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    • 2004
  • Purpose: To compare desimetrically intensity-modulated radiotherapy treatment plans with commercially available multileaf collimators (MLCs) of different leaf width for intracranial lesions. Materials and Methods: Twelve patients with intracranial lesions were treated with BrainLAB's micro-MLCs (mMLCs) and performed with the BrainSCAN ver. 5.2 planning software. They were replanned using the Varian 120 and 80 MLCs. These collimators have minimum leaf width of 3 mm, 5 mm and 10 mm at isocenter, respectively. PTV was $3.3~339.2\textrm{cm}^3$ and the number of beams was 3~7. These three plans were compared with respect to the uniformity and the conformity indices, doses to critical organ and normal tissue. Results: For the uniformity index of the planning target volume (PTV), there were no statistically significant differences between mMLCs and 120 MLCs (p=0.057) and between 120 MLCs and 80 MLCs (p=0.388). However, there was a difference between mMLCs and 80 MLCs (p<0.001). Maximum target dose to the PTV showed no dependency with respect to the leaf width. On the contrary, there were statistically significant differences in the conformity indices between mMLCs and 120 MLCs (p=0.003), between mMLCs and 80 MLCs (p=0.003) and between 120 MLCs and 80 MLCs (p=0.003). The volume of brainstem irradiated to $\geq$70% dose and to $\geq$50% dose was increased as the leaf width of MLCs increased. In particular, the volume of normal tissue irradiated is obviously changed for different leaf width. Volumetric increments for MLCs with leaf widths of 5 mm and 10 mm were 6.3% and 23.2% to the normal tissue irradiated to $\geq$50% dose, and 8.7% and 32.7% to the normal tissue irradiated to $\geq$70% dose, respectively, compared to the volume for MLCs with leaf width of 3 mm. Conclusions: The uniformity index and maximum target dose to the PTV showed no dependency with respect to leaf width of MLCs. However, the conformity index was improved as the leaf width decreased. For the sparing of normal brain tissue, treatment plans with MLCs of 3 mm leaf width is more effective, compared to ones with MLCs of 5 mm and 10 mm leaf widths.

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Relationship of Physique to the Size of Dental Arch in Dental Hygiene Students (일부대학 치위생과 학생의 체격과 치열궁 크기의 관련성)

  • Han, Ji-Hyoung;Lee, Chun-Sun;Hwang, Ji-Min
    • Journal of dental hygiene science
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    • v.13 no.2
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    • pp.197-202
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    • 2013
  • The purpose of this study was to examine the relationship between the physique of 147 dental hygiene students and the size of their dental arch. A survey was conducted, and impression taking was carried out at the same time to measure the arch length and width of the students. The findings of the study were as follows: 1. 74.8 percent of the students got a dental checkup over the past year. 86.4 percent breathed through the nose. 18.4 percent had ever received orthodontic treatment, and 49.7 percent had ever had their tooth extracted. 94.6 percent were fond of refined food, and 52.4 percent had a liking for hard food. 2. There were no statistically significant differences in arch length and width according to all the variables that related the size of dental arch. 3. Out of the physique variables, weight was identified as a variable to make a statistically significant difference to arch length and width. A heavier weight led to larger mandibular inter-canine width and larger maxillary inter-molar width. 4, A heavier weight had a weaker positive correlation to inter-canine width and inter-molar width. Arch length and width were most closely linked to maxillary inter-molar width and mandibular inter-molar width. The above-mentioned findings show that weight exerted an influence on the form of dental arch among the physique variables. In the future, sustained research efforts should be made to keep track of the relationship between the change of physique and the change of dental arch to improve the stability of occlusion and promote oral health.

Analysis of Frequency Characteristic of Travelling-Wave Photodetector Using the FDTD Method (FDTD를 이용한 Travelling-Wave Photodetector의 주파수 특성 해석)

  • 공순철;이정훈;이승진;최영완
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.02a
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    • pp.14-15
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    • 2000
  • We study the microwave characteristics of traveling-wave photodetector using the finite-difference time-domain method. We present two parameters for design, the width of PIN region and the thickness of i-layer, and analyze TWPD's property in frequency domain.

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TRANSVERSE CHANGE OF THE PROXIMAL SEGMENT AFTER BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY IN MANDIBULAR PROGNATHISM USING COMPUTED TOMOGRAPHY (하악전돌증환자에서 하악지시상분할골절단술 후 전산화단층촬영을 이용한 근심골편의 횡적인 변화에 관한 연구)

  • Kim, Young-Joon;Kook, Min-Suk;Park, Hong-Ju;Shet, Uttom Kumar;Oh, Hee-Kyun
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.30 no.3
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    • pp.232-240
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    • 2008
  • Purpose: This study was performed to evaluate transverse changes of proximal segment after bilateral sagittal split ramus osteotomy (BSSRO) using 3-D CT in mandibular prognathism. Patients and methods: Twenty-two patients who underwent BSSRO for mandibular set-back in class III malocclusion without facial asymmetry were examined. Miniplates were used for the fixation after BSSRO. Facial CT was taken before and after BSSRO within 3 months. Frontal-ramal inclination (FRI), inter-gonial width (IGW) and intercondylar width (ICW) were measured in 3-D CT images using V-works $4.0^{TM}$ program. Student t-test was used to compare the changes between pre- and post-operative measurements using SPSS 10.0 program. Results: 1. Mean peroperative FRI value ($12.87{\pm}3.43^{\circ}$) was slightly increased to postoperative value ($14.13{\pm}3.72^{\circ}$) (p < 0.05). The average FRI increased 10.42% and the range was from $-2.46^{\circ}$ to $3.34^{\circ}$. 2. Mean peroperative IGW ($99.01{\pm}5.36$) was slightly decreased to postoperative IGW ($96.51{\pm}5.88mm$) (p < 0.05). The average IGW decreased 2.52 % and the range was from $-6.61^{\circ}$ to 0.91 mm. 3. Mean preoperative ICW ($125.01{\pm}5.30mm$) was slightly decreased to postoperative ICW ($125.40{\pm}5.45mm$) (p < 0.05). There is no significant difference between pre- and post-operative ICW. 4. There was significant correlationship between FRI difference and IGW difference (p < 0.05). Conclusions: These results indicate that the lower ramus of the proximal segment is moved inward after BSSRO procedure for mandibular set-back.