• 한국치위생학회지
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• 제7권4호
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• pp.365-379
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• 2007

The objective of the current study is to provide basic data necessary for the development of systematic program that is required for the systematic occupational work training of dental hygienists who newly employed at dental hospitals or clinics. The results of the surveys were listed as in below. The survey was conducted for 175 experienced dental hygienists who are in charge of occupational work training in 6 regions(Seoul, Kyunggi, Busan, Ulsan, Kwangju, Chungnam, Kyungnam) of the country where the occupational work training for new dental hygienists is systematically operated. 1. The recognition of experienced dental hygienists for the importance of occupational work training revealed that image training was the most importantly recognized by dental hygienists in Seoul Kyunggi regions(pE.01). In case of Busan region, periodontic training and conservative dentistry training were the most importantly recognized, and customer service training was mostly highly recognized in Ulsan region(pE.01). In case of Kwangjuregion, dental health insurance claim training was recognized as most important subject, and Patient consultation training was the most importantly recognized in Chungnam region. In case of Kyungnam region. Oral surgery was recognized as the most important training subject. 2. Regard on the importance of the range of occupational work training, the experienced dental hygienists with less than 2 years of experience were found to recognize the training of greeting and naming most importantly, the dental hygienists with 2~3 years of experience most importantly recognized oral surgery, and the dental hygienists with 4~5 year of experience were found to recognize conservative training most importantly. In case of dental hygienists having 6~9 year of experience recognized periodontic and conservation trainings as the most important subjects, and the dental hygienist having more than 10 years of experience were found to recognize conservative and image trainings mostly importantly.

• 대한치과의사협회지
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• 제48권6호
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• pp.436-442
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• 2010

Objective: Transmission of S. mutans, a major dental caries pathogen, occurs mainly during the first 2.5 years of age. Children appear to acquire S. mutans mostly from their mothers, but few studies have investigated preventive effect of xylitol to S. mutans transmission from mother to child. The aim of this study was to perform a follow-up evaluation the preventive effect of xylitol chewing gum of the S. mutans of children's oral cavities, which included the characteristics of vertical transmission from mother to child. Methods: The mothers voluntarily participating in a women's oral health prevention program were divided into two groups (a control and a xylitol group). The subjects were 20 mother-child pairs, who were monitored for 30 months. Xylitol chewing gum group had consumed 2 gum pellets, 3 times a day for 24 months, and then they were followed until 30 months. At baseline, 24 and 30 months whole stimulated saliva samples were collected from the mothers. Children were also recruited from 6 months to 30 months after birth and were collected their dental plaque samples. After isolation and identification, the analysis of the colony count, transmission electron microscopy and real-time RT-PCR were performed to analyze the characteristics of S. mutans. Results: The S. mutans counts decreased steadily in the xylitol group at 24 months, but increased at 30 months. The similar results were showed at their children. While the glucan synthesis was decreased at xylitol group both mother and child. The expression of gtfB, gtfD and ftf were significantly reduced in the xylitol group both mother and child (p<0.05). Conclusions: These findings indicate that chewing xylitol gum over a long period may decrease the expression of the genes associated virulence and reduced the glucan synthesis of S. mutans, which can result the preventing the mother-to-child transmission of S. mutans.

• Asian-Australasian Journal of Animal Sciences
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• 제31권8호
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• pp.1308-1314
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• 2018

Objective: Gut health improvements were monitored with respect to growth performance, diarrhea incidence, fecal bacterial population and intestinal morphology of suckling pigs orally supplemented with live Lactobacillus salivarius (L. salivarius) oral suspensions and challenged with $F4^+$ enterotoxigenic Escherichia coli (ETEC). Methods: Two groups of newborn pigs from 18 multiparous sows were randomly designated as non-supplemented (control: n = 114 piglets) and L. salivarius supplemented groups (treatment: n = 87 piglets). Treatment pigs were orally administered with 2 mL of $10^9$ colony-forming unit (CFU)/mL L. salivarius on days 1 to 3, then they were orally administered with 5 mL of $10^9CFU/mL$ L. salivarius on days 4 to 10, while those in control group received an equal amount of phosphate buffered saline solution. On day 24 (2 weeks post supplementation), one pig per replicate of both groups was orally administered with $10^8CFU/mL$ $F4^+$ ETEC, then they were euthanized on day 29 of experiment. Results: Results revealed that pigs in treatment group had a statistically significant increase in average daily gain, body weight and weight gain, and tended to lower diarrhea throughout the study. Numbers of Lactobacillus population in feces of treatment pigs were higher than control pigs, especially on day 10 of study. Numbers of total bacteria in intestinal contents of control pigs were also increased, but not Coliform and Lactobacillus populations. Histological examination revealed statistically significant improvements of villous height and villous/crypt ratio of duodenum, proximal jejunum and distal jejunum parts of treatment pigs compared with controls. Duodenal pH of treatment group was significantly decreased. Conclusion: Oral supplementation of live L. salivarius during the first 10 days of suckling pig promoted growth performance and gut health, reduced diarrhea incidence, increased fecal Lactobacillus populations and improved intestinal morphology.

• Clinical and Experimental Reproductive Medicine
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• 제41권1호
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• pp.15-20
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• 2014

Objective: Combined oral contraceptives (COCs) have some adverse effects on the serum lipid profile. Because hyperlipidemia is one of the risk factors in cardiovascular diseases, lipid abnormalities should be evaluated in women consuming COCs. Vitamins E and C are known to have beneficial effects on serum lipid profiles. Therefore, in this study, we evaluated the effects of vitamins E and C on serum lipids in women using COCs. Methods: The study compared changes in lipid parameters with and without vitamin therapy in women consuming COCs compared to those of a control group (40 non-contraceptive users or NCU) for 4 weeks. Total cholesterol and triglyceride, low-density lipoprotein (LDL), and high-density lipoprotein (HDL) levels along with HDL/LDL ratios were measured for all participants. Results: COC users experienced significantly higher increases in the levels of triglycerides and LDL than non-users (p<0.05). However, no significant differences were noted in the total cholesterol and HDL levels. In the treated COC group receiving vitamins E and C, the HDL level and the HDL/LDL ratio increased and the LDL and triglycerides levels decreased significantly compared with those of the other groups. Conclusion: The results of our study indicate that supplementation with antioxidant vitamins E and C restores a normal lipid profile in COC users.

• 한국치위생학회지
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• 제15권2호
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• pp.295-301
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• 2015

Objectives: The objective of this study was to investigate the effect of gender role identity on major choice, and preference and choice of job for applicants of dental hygiene department. Methods: The subjects were 202 high school girl students visiting K university in October, 2014 and in January, 2015 for the interview of early and regular admission to the university. The questionnaire consisted of 3 questions of general characteristics of the subjects, 40 questions of gender role identity, and 6 questions of career choice factors. Gender role identity included 15 questions of masculinity, 15 questions of feminity, and 10 questions of neutral gender using instrument of Kim by Likert scale. Cronbach's alpha of masculinity, feminity, and neutral gender was 0.810, 0.762, and 0.801 respectively. The data were analyzed using ${\chi}^2$-test with SPSS Win 12.0. Results: The effects of gender role identity on major choice and professionalism were as follows. In major choice motivation, psychological type, feminity type and masculinity types selected aptitude, professional sustainability and recommendation by acquaintance in order, but undifferentiated type selected aptitude, recommendation by acquaintance and professional sustainability in order. There was a statistically significant difference(p<0.05). In major choice information, psychological, feminity and undifferentiated types prefer indirect experience but masculinity type prefers direct experience. There was a statistically significant difference(p<0.05) In job selection, psychological, feminity and undifferentiated types want to do assistant works rather than oral health prevention and education. Masculinity type want to do oral health prevention and education rather than assistant work. There was a statistically significant difference(p<0.001). Conclusions: The gender role identity affected the factors related to choice of major and job in dental hygiene major applicants. It is necessary to provide the career choice program for the high school students by personality types and gender role identity types.

• 대한치과교정학회지
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• 제49권4호
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• pp.205-213
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• 2019

Objective: The aim of this study was to evaluate the amount of tooth movement and histologic changes with different corticotomy designs and micro-osteoperforation in rabbits. Methods: The sample consisted of 24 rabbits divided into three experimental groups (triangular corticotomy [TC] and indentation corticotomy [IC] with flap, and flapless micro-osteoperforations [MP]) and a control. A traction force of 100 cN was applied by connecting the first premolars to the incisors. The amount of tooth movement was measured. Kruskal-Wallis test was used to assess differences in tooth movement between the groups. Micro-computed tomography, hematoxylin and eosin staining, and tartrate-resistant acidic phosphatase (TRAP) analysis were performed. Analysis of variance was applied to assess differences in TRAP-positive osteoclast count between the groups. Results: The amount of tooth movement increased by 46.5% and 32.0% in the IC and MP groups, respectively, while the bone fraction analysis showed 69.7% and 8.5% less mineralization compared to the control. There were no significant intergroup differences in the number of TRAP-positive osteoclasts. Conclusions: The micro-osteoperforation group showed no significant differences in the amount of tooth movement compared to the corticotomy groups, nor in the TRAP-positive osteoclast count compared to both corticotomy groups and control.

• 대한치과교정학회지
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• 제49권3호
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• pp.188-193
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• 2019

Objective: The aim of this finite element study was to clarify the mechanics of tooth movement in palatal en-masse retraction of segmented maxillary anterior teeth by using anchor screws and lever arms. Methods: A three-dimensional finite element method was used to simulate overall orthodontic tooth movements. The line of action of the force was varied by changing both the lever arm height and anchor screw position. Results: When the line of action of the force passed through the center of resistance (CR), the anterior teeth showed translation. However, when the line of action was not perpendicular to the long axis of the anterior teeth, the anterior teeth moved bodily with an unexpected intrusion even though the force was transmitted horizontally. To move the anterior teeth bodily without intrusion and extrusion, a downward force passing through the CR was necessary. When the line of action of the force passed apical to the CR, the anterior teeth tipped counterclockwise during retraction, and when the line of action of the force passed coronal to the CR, the anterior teeth tipped clockwise during retraction. Conclusions: The movement pattern of the anterior teeth changed depending on the combination of lever arm height and anchor screw position. However, this pattern may be unpredictable in clinical settings because the movement direction is not always equal to the force direction.

• 한국융합학회논문지
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• 제13권2호
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• pp.47-54
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• 2022

본 연구는 노인의 저작 능력이 노쇠에 미치는 영향을 분석하고자 하였다. 65세 이상의 노인 224명을 대상으로 일반적 특성, 주관적 및 객관적 저작 능력, 노쇠수준을 조사하였다. 연구 결과는 다음과 같다. 첫째, 저작 능력은 연령, 교육 수준, 경제활동 여부, 거주 형태, 틀니 장착 여부에 따라 차이가 있었다. 둘째, 비노쇠 노인의 저작 능력은 노쇠 노인에 비해 통계적으로 유의하게 높았다. 셋째, 저작 능력이 좋은 대상자에 비해 저작 능력이 좋지 못한 대상자에서 노쇠가 있을 위험비는 2.33배 높았으며, 연령을 보정한 결과 저작 능력이 좋은 그룹에 비해 좋지 못한 그룹에서 노쇠가 있을 위험비는 2.30배 높게 나타났다. 이를 통해 노인의 저작 능력이 노쇠의 예측요인 중의 하나이며, 지역사회 차원의 구강건강 관리를 통해 노쇠를 예방하여 건강한 노화를 달성하는 노력이 필요할 것으로 생각한다.

• 대한치과교정학회지
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• 제53권3호
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• pp.175-184
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• 2023

Objective: To evaluate and compare a series of volume changes in the nasal cavity (NC), nasopharynx, oropharynx, and maxillary sinuses (MS) in growing Class III patients after either rapid palatal expansion (RPE) or alternate rapid maxillary expansion and constriction (Alt-RAMEC) followed by facemask (FM) therapy, by using cone-beam computed tomography (CBCT). Methods: Forty growing Class III patients were retrospectively selected and divided into two matched groups: RPE/FM (14 females, 6 males; mean age, 9.66 ± 1.23 years) and Alt-RAMEC/FM groups (14 females, 6 males; mean age, 10.28 ± 1.45 years). The anteroposterior and vertical displacements of Point A, the volumes of the NC, nasopharyngeal, oropharyngeal, and MS were measured at different time points: pretreatment (T1), postexpansion (T2), and postprotraction (T3). Results: Both groups demonstrated significant maxilla advancement (by 1.3 mm) during expansion, with a statistically significant intergroup difference during protraction (RPE/FM, 1.1 mm; Alt-RAMEC/FM, 2.4 mm; p < 0.05) and throughout the treatment (RPE/FM, 2.4 mm; Alt-RAMEC/FM, 3.7 mm; p < 0.05). NC and nasopharyngeal airway volumes increased significantly in both groups after expansion, protraction, and treatment. The oropharyngeal and MS volumes increased in both groups after protraction and post-treatment. However, no volumetric differences were observed between the two groups. Conclusions: There was no significant difference in airway volume changes, including NC, nasopharyngeal, oropharyngeal airway, and MS, between RPE/FM and Alt-RAMEC/FM groups at different time points. Although there was significantly more forward movement after protraction in the Alt-RAMEC/FM group, the difference was deemed too small to be clinically relevant.

• 치위생과학회지
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• 제8권3호
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• pp.123-129
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• 2008

본 연구는 조사대상자의 주관적 구취 인식에 대한 실태를 조사하기 위하여 2007년 6월부터 8월까지 약 3개월에 걸쳐 주관적 설문 방법을 통하여 275명의 성인을 대상으로 자료를 수집하여 다음과 같은 결과를 얻었다. 1. 구취에 대한 자각자율을 보았을 때 현재와 평상시 구취를 느낀다고 응답한 성인은 각각 68.4%와 79.3 %이었으며, 느끼지 않는다고 응답한 성인은 각각 31.6%(현재), 20.7%(평상시)로 나타났다. 2. 하루 중 구취를 가장 심하게 느끼는 시기는 자고 일어난 직후가 83.5%로 가장 높게 나타났으며, 주요 구취부위는 혀가 51.9%로 가장 높게 나타났다. 3. 구취의 유형에서 음식섭취 후의 음식 냄새가 37.2%로 가장 많았고, 다음으로 공복 시의 단 냄새가 22.5%로 나타났다. 4. 구취가 날 경우의 치료희망에 대해서는 조사대상자 중 66.9%의 응답자가 구취치료에 대해 긍정적 반응을 보였고, 특히 7.3%의 응답자는 치료 요구도가 매우 큰 것으로 나타났다. 5. 식사시기에 따라서 현재 느껴지는 구취의 정도에서 식사한지 1시간 이내의 경우 44.7%가 구취가 안 난다고 응답하였고, 1-2시간은 37.6%, 2-3시간은 16.3%, 3-4시간은 14.8%, 4시간 이상은 23.7%가 구취가 안 난다고 응답하여 식사시기에 따라 구취의 정도는 통계적으로 유의한 차이를 보였다(p < 0.01). 본 연구 결과를 통해 일반인들의 구취의 인지여부와 구취의 주요 원인 부위, 또는 문헌을 통한 혓솔질의 중요성과 실시 방법에 대해 알 수 있었다. 이에 향후 객관적인 구취 측정치를 근거로 구취유발요인과의 관련성을 다각적으로 조사하여 구취인지 유무를 연구, 비교할 필요가 있으며, 앞으로 더 나아가 구취를 예방하거나 감소시키기 위한 다양한 연구들이 이루어져야 할 것으로 생각된다.