• 대한치과의사협회지
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• 제50권2호
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• pp.64-71
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• 2012

Recently, the presurgical orthodontic duration tends to be shortened by virtue of the advancement of surgical and orthodontic techniques in class III orthognathic surgery cases. But the predictability of the surgical results should be secured by removing several uncertain factors in presurgical orthodontic treatment. The purpose of this study is to investigate the influence of immediate postsurgical occlusal stability on postsurgical mandibular change. The study includes 40 patients who underwent orthognathic surgery to correct skeletal class III malocclusion. The patients were divided into two groups based on the numbers of occlusal contact in surgical setup occlusion: group 1 (stable surgical occlusion, n=24) and group 2(unstable surgical occlusion, n=16). Changes of horizontal and vertical mandibular measurements during postsurgical follow up period(from 1 week postsurgery to 12month after debonding) were compared to examine the differences between two groups. The stability of surgical occlusion is one of the factors influencing postsurgical mandibular changes in class III malocclusion. The various class III malocclusion cases have specific prerequisites for the orthognathic surgery according to the skeletal patterns. The prerequisites should be obtained by minimum presurgical orthodontics to increase the predictability of the surgical results.

• International Journal of Oral Biology
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• 제44권4호
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• pp.144-151
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• 2019

Alopecia has emerged as one of the biggest interests in modern society. Many studies have focused on the treatment of alopecia, such as transplantation of hair follicles or inhibition of the androgen pathway. Hair growth is achieved through proper proliferation of the components such as keratinocytes and dermal papilla cells (DPCs), movement, and interaction between the two cells. The present study examined the effect of the hedgehog (Hh) signaling pathway, which is an important and fundamental signal in the cell, on the morphology and the viability of human keratinocytes and DPCs. Upregulation of Hh signaling caused a morphological change and an increase in epithelium-mesenchymal transition-related gene expression but reduced the viability of keratinocytes, while the alteration of Hh signaling did not cause any change in DPCs. The results show the possibility that the regulation of Hh signaling can be applied for the treatment of alopecia.

• 대한치과의사협회지
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• 제48권2호
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• pp.127-139
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• 2010

Objectives : The study explored perceptional gap of dentists and their employees between expectation and satisfaction. Methods : For analysis, the study surveyed 407 employees and 91 dentists on their expectation and satisfaction depending on expectation. Results : When the satisfaction on a question was lower than expectation; the rate of sufficiency was below 100%, it is necessary to improve on the question. Contrarily when the satisfaction on a question was higher than expectation; the rate of sufficiency was upper 100%, it is necessary to continuously support the question. The most of satisfaction of employees on their dentists and their organization were lower than employees's expectation of those. The most of satisfaction of dentists on their own and employees were lower than dentists's expectation of those as similar as employees cases, It means that all of questions need to improve continuously. Conclusions : The issues for prior decision to change these phenomena are 1) improvement of communication each other, 2) recovery of credence each other, and 3) leadership style change from authoritarian to consideration.

• 대한의생명과학회지
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• 제26권4호
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• pp.327-335
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• 2020

As the interest in oral health is increasing with quality of life. The most representative oral diseases include dental caries, periodontal disease, and malocclusion, as well as dry mouth and oral mucosa. Cinnamaldehyde have an antioxidant effect that has been studied not only to treat rheumatism and hypertension, but also to protect liver, and gastrointestinal tract, but there are few studies related to the control of oral diseases. The purpose of this study was the effect of enhanced orofacial pain when oral administration of cinnamaldehyde in the oral diseases. Cinnamaldehyde (5, 12.5, 25, and 50 mg/kg) orally administered at a dose of 1 mL, and the change in biological response was confirmed after a week. In addition, 5% formalin (30, 50 μL) was injected into TMJ and subcutaneous areas of the whiskers of rats to observe the change in the threshold of the improved orofacial pain model. As a result of the experiment, in the xerostomia model, drinking water was decreased in the cinnamaldehyde-administered group, feed intake and weight increased, and saliva was also increased compared to the naïve group. In particular, the most significant increase trend was observed at the concentrations of 25 and 50 mg/kg. In addition, it was confirmed that the pain behavioral response of the orofacial area improved by oral diseases decreased depending on the concentration of cinnamaldehyde. Based on these results, cinnamaldehyde effectively reduced symptoms related to xerostomia and showed improved pain relief in the orofacial areas.

• 대한치과기공학회지
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• 제45권3호
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• pp.55-60
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• 2023

Purpose: This study aimed to evaluate the effects of a special heat treatment on Pd-Au-Ag metal-ceramic alloy after degassing treatment and on changes in the hardness of the alloy during the firing process. Methods: Specimen alloys were cast and subjected to degassing at 900℃ for 10 minutes. These specimens were then subjected to a special heat treatment at 600℃ for 15 minutes in a dental porcelain furnace. Further, the specimens were subjected to simulated firing in the porcelain furnace. The resulting specimens were then tested for hardness, and changes in the microstructure were observed. Results: There was a decrease in the hardness of the alloy during the simulated firing of the cast alloy due to the coarsening of the particles. Meanwhile, additional heat treatment after degassing was found to play a crucial role in preventing a decrease in hardness. This treatment effectively suppressed the coarsening of the precipitates during repeated firing at high temperatures. Conclusion: Specific heat treatment of the Pd-Au-Ag metal-ceramic alloy prevented a decrease in its hardness and extended the lifespan of the metal-ceramic prosthesis.

• 대한치과의사협회지
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• 제44권12호통권451호
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• pp.816-829
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• 2006

The purpose of this study was to determine the level of perception and preference between dentists and lay people to altered facial profile. The assessors consisted of 40 dentists and 54 lay people, the survey was performed using questionnaire asking the order of perception and preference. The profiles presented in the questionnaire were based on the profile of one man and one woman, each morphed according to anterior or posterior direction of maxilla and mandible. The results were as follows. 1. In antero-posterior change of man and woman s profile, both dentists and lay people were sensitive to relatively skeletal profile (convex profile) changes than skeletal profile (concave profile) changes. 2. At least dentists needed to be perceived a 2 mm change in convex profile and a 3 mm change in concave profile and lay people needed to be perceived a 2 mm change in convex profile and a 3 mm change in concave profile for profile view. 3. Dentists are more sensitive in perception of man s profile change than lay people, but there is no significant differences between dentists and lay people in sensitivity of detection for woman s profile changes . 4. It seems that there is a general concordance between dentists and lay people in there perception of man s and woman s facial profile. This information might be clinician in comprehensive perception and preference of dentists and lay people to altered facial profile.

• 대한치과기공학회지
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• 제31권4호
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• pp.97-108
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• 2009

This study was conducted in order to promote students' interest in overseas employment and to present methods of improving education that suits globalization and internalization. From responses to individual written survey questionnaires answered by 439 students who are studying Dental technology at colleges in Kyung-ki and Chung-cheong. The following are the results regarding their satisfaction levels with their majors and their interest in working abroad: 1. Regarding the motivating factors to major in Dental technology, students(37.7%), particularly most juniors(43.5%), have chosen this major to get a this professional job. The most common source of information in choosing majors is the Internet(44.4%). There was a slight difference in their knowledge about the major before college among freshmen, sophomores, and juniors. 2. Most students do not want to change their majors even if they are provided with the chance to do so(69.2%). They are in general satisfied with their studies. The result shows that the Dental technology majors are positive toward their major. 3. Many students have heard about overseas employment, particularly in case of juniors(98.5%), and there was a difference among different years of studies. They want to work abroad if they are given the chances(79.3%), which indicates that the Dental Technology majors have much interest and positive attitude in overseas employment. 4. The most significant barrier to their overseas employment is the language, and thus the Dental technology majors should improve their language abilities to be more involved in working abroad.

• 한국치위생학회지
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• 제17권3호
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• pp.431-440
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• 2017

Objectives: The study was conducted to evaluate the effects of the students majoring in dental hygiene on their oral health beliefs and oral health behavior. Methods: The survey was conducted using selfadministered questionnaires targeting 619 female students majoring in dental hygiene at three Universities in k and J province. The stronger health oral belief means higher score in susceptibility, severity, benefit and salience, but the higher score in barrier means stronger recognition in obstacle. Results: There was significant correlation between susceptibility and experience of not-treated oral disease (OR [odds ratio] 2.40; 95% CI [confidence interval] 1.73-3.34)' and 'dental caries (OR 2.36; 95% CI 1.25-4.45)'. Benefit had significant correlation with 'visiting dental clinic (OR 1.58; 95% CI 1.14-2.19)'. Salience had significant correlation with 'experience of not-treated oral disease (OR 0.70; 95% CI 0.52-0.94)'. Barrier had significant correlation with 'visiting dental clinic (OR 0.73; 95% CI 0.56-0.95)' and 'removing oral plaque (OR 0.71; 95% CI 0.52-0.95)'. There was no significant correlation between oral health belief and 'using of oral hygiene device' or 'regular tooth brushing'. Conclusions: Diverse oral health behaviors were affected by susceptibility, benefit, salience and barrier in oral health belief. The programs for oral health education and preventing oral disease should be prepared to change oral health belief to promote the oral health systematically based on the results of this study.

• 한국치위생학회지
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• 제17권6호
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• pp.993-1001
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• 2017

Objectives: This study was conducted to examine the effectiveness in oral health promotion through oral health education for freshmen students of the dental hygiene department. Methods: To verify its effectiveness, research was conducted on 74 freshmen of the dental hygiene department by the evaluation of DMFT index, PHP index, and Cariview test (2015-2016). Results: The analysis of the test results using Cariview equipment shows a categorization of low risk group consisting of 10 students (13.5%), middle risk group consisting of 47 students (63.5%), and a high risk group consisting of 17 students (22.9%). DT index according to the number of daily tooth brushing by <2 is DT index average score higher and in such a case, statistics are considered meaningful (p<0.01). Oral health state at DMFT index of low risk group according to Cariview risk group for an analysis is lower than both the middle risk group and the high risk group (p<0.001). Conclusions: A review of the effect of the promotion of oral health through oral health education on the behavior change rather than of Cariview test and value of dental plaque through tooth brushing method was conducted.

• 한국치위생학회지
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• 제12권1호
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• pp.27-35
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• 2012

Objectives : This study was performed to provide the basic data for oral health of infants, through the comparison of Streptococcus mutans activities(the representative bacteria of initial dental caries), in main nutritional foods for infants: breast milk, milk powder, and soya milk. Methods : The study targeted 30 infants and the saliva was sampled after the oral examination. The pH of sampled saliva was measured; and the sample of 'the saliva', 'the saliva and breast milk', and 'the saliva and formula milk' by researcher were produced; and the measurement was repeated 7 times. Results : As a result of examining the change of colony number of Streptococcus mutans by hour, the bacterial activity took in the source of nutrition took place in the first place; and in the group with dental caries, breast-feeding at night occurreds most frequently. Due to the combined activities, such as the increase in the contact time, the existence rate of dental caries appeared high. However, as the improvement of breast-feeding is closely related to the nutrition supply to babies, rather than the improvement of breast-feeding, the 12 hours after the culture in which Streptococcus mutans activities started was considered. Conclusions : In case of breast-feeding at night, it is necessary to remove the dental plaque in the mouth, before 12 hours has passed. Especially, using toothbrush and toothpaste to decrease the occurrence of dental caries, after the eruption of teeth, is recommended for oral administration.