• Imaging Science in Dentistry
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• v.49 no.1
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• pp.53-58
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• 2019

Purpose: To present characteristic findings of Tc-99m hydroxymethylene diphosphonate (HMDP) scintigraphy, computed tomography (CT), and magnetic resonance (MR) imaging for osteonecrosis in the mandible, especially osteoradionecrosis(ORN) and medication-related osteonecrosis of the jaw(MRONJ). Materials and Methods: Thirteen patients with MRONJ and 7 patients with ORN in the mandible underwent Tc-99m HMDP scintigraphy, CT, and MR imaging (T1-weighted images[T1WI], T2-weighted images[T2WI], short inversion time inversion recovery images[STIR]), diffusion-weighted images[DWI], and apparent diffusion coefficient [ADC] mapping). The associations of scintigraphy, CT, and MR imaging findings with MRONJ and ORN were analyzed using the chi-square test with the Pearson exact test. Results: Thirteen patients with MRONJ and 7 patients with ORN in the mandible showed low signal intensity on T1WI and ADC mapping, high signal intensity on STIR and DWI, and increased uptake on scintigraphy. Periosteal bone proliferation on CT was observed in 69.2% of patients with MRONJ(9 of 13) versus 14.3% of patients with ORN(1 of 7)(P=0.019). Conclusion: This study presented characteristic imaging findings of MRONJ and ORN on scintigraphy, CT, and MR imaging. Our results suggest that CT can be effective for detecting MRONJ and ORN.

• The Journal of the Korean dental association
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• v.53 no.2
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• pp.103-110
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• 2015

The dental accidents and disputes among Korean dentists have been on the increase with time. The main purpose of this study is to figure out the actual status of the dental accidents and malpractice disputes based on a questionnaire survey. The findings showed that 64.8% of respondents had been experienced the dental accidents, and 52.9% of respondents had been locked into the disputes. Within 5 years from the start of dental practice, the nearly half of the dentists responded the experience of the dental accidents and disputes. The amount of compensation for dental accidents and disputes wereindentalimplant, prosthodontics, and oral surgery treatments in descending order. The highest incident type was wrong process/treatment/procedure problem in clinical process/procedure.

• Journal of Korean society of Dental Hygiene
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• v.5 no.2
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• pp.159-169
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• 2005

Objectives: The purpose of this study was to investigate turnover intention of dental hygienist who were employed at the private dental clinic in Ulsan, Korea. Methods: The data obtained from 100 dental hygienists during 1 month. The survey was performed by a face-la-face interview questionnaire consisting of 19 items and the 5 point Likert type response format. The respondents were 77 from dental hygienists. The adjusted response rate was 80.2%(77/96). Data were analyzed using frequency distribution, independent t-tests, ANOVA, chi-square and correlation. All statistical analyzed were conducted using Statistical Package for SPSS 11.5. Results: There was experiences of turnover the longer the professional career, the higher income, married personnel. Turnover intention was a statistically correlated with income. Conclusions: The findings suggest that dental hygienists who remain in the workforce are positively influenced mainly by self-development. Employer of dental hygienists should be aware of these factors in employing process.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.29 no.1
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• pp.223-239
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• 1999

Purpose: to evaluate the usefulness of the panoramic radiography, generally used in dental clinic, for the detection of the maxillary sinus pathosis due to the inflammation and tumor, through the comparison with CT findings as the absolute standard. Materials & Methods: 150 maxillary sinuses of 75 patients with or without particular signs and symptoms and showing soft tissue lesions or destruction of maxillary sinus walls in at least one sinus in CT, were selected as subject samples, and the panoramic radiography of the same patients were interpretated by 3 dental radiologists and 3 non dental radiologist given no previous informations. Using the CT findings as the absolute standard, the diagnostic ability of panoraimc radiography in the mucosal thickening, maxillary sinus haziness, inferior wall destruction, medial wall destruction, posterolateral wall destruction and the superior wall destruction was evaluated using the ROC curve and the difference between dental radiologist group and non dental radiologist group was also evaluated. Results: 1. When dental radiologist group interpretated the destruction of inferior wall and posterolateral wall, the kappa value which shows interobserver's coincidence was above 0.75. 2. The diagnostic ability according to site of interpretation was the highest when the inferior wall was interpretated in both observer groups and there was a statistically significant difference between the dental radiologist group and non dental radiologist group in interpretating the mucosal thickening, haziness, destruction of the inferior and medial wall(p<0.05). 3. The diagnostic ability in detecting the destruction of the sinus walls was better than in soft tissue lesions in both groups and between the groups there was a statistically significant difference(p<0.05). Conclusion: When detecting the destruction of inferior and posterolateral wall of the maxillary sinus there was coincident with that of CT findings, and so it is considered that diagnostic ability of panoramic radiography is high in this point. But in interpretating the destruction of medial wall and soft tissue lesions, diagnostic ability of the panoramic radiography was relatively low and there was a significant difference between the dental radiologist group and non dental radiologist group. Therefore CT or other auxiliary diagnostic method will be necessary when evaluating thorough pathosis of maxillary sinus objectively.

• Imaging Science in Dentistry
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• v.51 no.1
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• pp.73-80
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• 2021

Purpose: The purpose of this study was to evaluate the cone-beam computed tomographic (CBCT) imaging and histopathological characteristics of osteoradionecrosis(ORN) and medication-related osteonecrosis of the jaw(MRONJ). Materials and Methods: Ten surgical specimens from segmental mandibulectomy (3 ORN and 7 MRONJ) were analyzed using CBCT. The CBCT parameters were as follows: high-resolution mode (tube voltage, 90.0 kV; tube current, 4.00 mA; rotation time, 16.8 s; field of view, 56 mm×56 mm; thickness, 0.099 mm). Histopathological characteristics were evaluated using histological slides of the surgical specimens. The Pearson chi-square test was used to compare ORN and MRONJ in terms of CBCT findings(internal texture, sequestrum, periosteal reaction and cortical perforation) and histopathological characteristics(necrotic bone, inflammatory cells, reactive bone formation, bacteria, Actinomyces, and osteoclasts). A P value less than 0.05 was considered to indicate statistical significance. Results: MRONJ showed periosteal reaction on CBCT more frequently than ORN (7 of 7 [100%] vs. 0 of 3 [0%], P<0.05). Regarding histopathological characteristics, MRONJ showed osteoclasts more frequently than ORN (6 of 7 [85.7%] vs. 0 of 3 [0%], P<0.05). Conclusion: This study evaluated the CBCT imaging and histopathological characteristics of ORN and MRONJ, and the findings suggest that CBCT could be useful for the evaluation of ORN and MRONJ.

• The Journal of the Korean dental association
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• v.54 no.11
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• pp.840-849
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• 2016

The purpose of this study was to examine dental care utilization and expenditures among children aged 0 to 19 years using Korea Health Panel Survey (KHPS) data in 2008 - 2013. Weighted estimates were nationally representative and statistical significances were analysed by $x^2$ test or adjusted Wald test using STATA 13 software. While dental care utilization increased steadily among children from 2008 through 2013, less than one-third the children received dental care in 2013. Compared with 2008, the proportion of restorative care, oral surgery, preventive care decreased and the proportion of orthodontic care, prosthetic care increased. While the proportion of amalgam markedly decreased, the proportion of resin increased. This study highlight socioeconomic disparities in dental utilization and expenditures among children. Especially the findings provide a baseline assessment for examining trends on dental care for children in the future.

• Journal of Korean society of Dental Hygiene
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• v.5 no.2
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• pp.147-157
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• 2005

The purpose of this study was to assess how mothers' oral health cognition influence on dental caries status of their children. The 194 children and their mothers were selected for this study. The children were 5, 6, 7 years old in the three day care centers in Ulsan, Korea. Date were collected by oral examination on children and self-administrated questionnaire on their mothers. The questionnaire was surveyed mothers' cognition of oral health and their socio-demographic characteristics. The findings of this study were summarized as follows: 1. The higher mother's income, the lower infant's dental caries, there was significant relation. 2. There were no significant relationship between dental caries preventive cogniton, infant's preventive treatment, between-meals intake and infant's dental caries. 3. There was significant relationship between morther's toothbrushing frequency and infant's dental caries.

• The Korean Journal of Health Service Management
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• v.7 no.4
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• pp.1-12
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• 2013

This study is to analyze the personality trait and dental fear of high school students. This study is conducted with a total of 603 first grader at high school in DaeGu city from 1st September to 30th October, 2009. In prevention and dental treatment knowledge category, the average score of female are higher than male. The concern of oral health, the experience of oral health education and the number of toothbrush are significantly different in the knowledge category. In dental fear category, the number of dental pain, the visiting is treatment, the recognize of dental state, the number of toothbrush and the change of dental visiting date are significantly different. In the prevention knowledge according to dental fear state, low fear group 7.03 is higher than high fear group. In the dental treatment knowledge according to dental fear state, high fear group 7.15 is higher than low fear group. In personal temperament, there are not significantly relationship between prevention knowledge, dental treatment knowledge and dental fear. These findings are basis to development of education programs which were included prevention and dental treatment knowledge before visiting dental clinics for reducing dental fear.

• Journal of Korean society of Dental Hygiene
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• v.10 no.2
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• pp.297-310
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• 2010

Objectives : The purpose of this study was to verify the impact of the empowerment of dental personnels as one of variables affecting the performance of dental institutions and to seek ways of boosting their organizational productivity. Methods : The subjects in this study were dental personnels who worked in dental institutions. After three investigators were trained, a pilot survey was conducted from October 20 to November 20, 2009, and the questionnaire used in the pilot survey was finalized. The collected data were analyzed with a SPSS(Statistical Package for the Social Science) WIN 12.0 program. The findings of the study were as follows: Results: 1. The dental personnels investigated got 3.98 in meaningfulness, one of the empowerment factors. They found a meaning in their job when they performed it. 2. The dental personnels who were older were more excellent in self- determination and influence, and age made a significant difference to their empowerment. 3. The dental personnels who were better educated were more superior in terms of empowerment, and academic credential made a significant difference to their empowerment factors was statistically. 4. The dental personnels whose yearly salary was larger were more which were the factors of empowerment of each factor was statistically significant. 5. Dental health agency workers less than three years accounted for most of 152 people were working longer duration of empowerment as a whole was that each of the factor scores. Empowerment of each factor was statistically significant. 6. The dental hygienists made up the largest group among the dental institution employees, and the kind of occupation made a significant difference to meaningfulness, competency and influence, which were the factors of empowerment. 7. The greatest group of the dental personnels worked in dental clinics, and the dental hospital employees surpassed the dental clinic employees in competency, self-determination and influence. There was a significant difference in the influence factor according to the type of dental institutions. Conclusions : Thus, the dental personnels were more aware of the meaningfulness factor when their perception of the job-related empowerment was checked, and it indicated that most of them attached importance to meaningfulness during their job performance. But just employees who worked in dental institutions located in particular regions were examined, the findings might not be generalizable. In the future, more extensive research should be implemented, and the sorts of programs that could stir up empowerment among dental institution employees or bolster organizational empowerment should be developed.

• Journal of Korean society of Dental Hygiene
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• v.1 no.2
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• pp.181-192
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• 2001

The purpose of this was to evaluate the level of knowledge about Hepatitis B and AIDS among dental hygiene students at six dental hygiene educational programs in nationwide, compare the findings to those of Song's study. 1703 dental hygiene students surveyed by mail and answered a questionnaire, using the questionnaire used developed by DiClemente el al., on Hepatitis B vaccination, antibody production, experience of unintentional needle stick injuries, experience of surgical operation and blood transfusion, personal risk factors for HBV and HIV, management of HBV and HIV postexposure management et al. The data indicated that dental hygiene students (79.0%) in this study had more HIV vaccination than dental hygiene(74.3%) in Song's study. As for recognition of antibody production after Hepatitis B vaccination, only 34.6% of respondents answered they knew having antibody production and 95% of respondents knew not having antibody production. Over one-half of the respondents (55%) answered they didn't even recognize having antibody production. 52.3 percent of dental hygiene students experienced unintentional needle stick injuries. The findings on the knowledge about Hepatitis B and AIDS were that dental hygienists (76.5 points) received higher mean score than those of dental hygiene students (71.0 points) and that the distribution of right answer rate also showed wider range in dental hygiene students (27.7~97.5%) than those of dental hygienist (41.2~99.5%). There were no statistical differences among dental hygiene education programs. Finding of this study support that the curriculum of dental hygiene program should include instruction on sources and methods of transmission of infectious diseases, risk of virus transmission in the workplace and principles of infection control. Furthermore, infection-control practices should be utilized routinely and their application to dental personnel, management of HBV and HIV postexposure management. Furthermore, for preventing the further spread of infectious diseases (HBV, HIV and AIDS${\cdots}$) caused by bloodborne viruses, imposing an obligation rather than recommendation on Hepatitis B vaccination to all dental personnel and routinely utilizing infection-control guidelines for all dental patients in dental practices (include dental educational programs) should be accomplished by coordination the government agency.