• Journal of the Korean Academy of Esthetic Dentistry
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• v.30 no.2
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• pp.71-90
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• 2021

The virtual patient dataset is a collection of diagnostic data from various sources acquired from a single patient into a coordinate system of three-dimensional visualization. Virtual patient dataset makes it possible to establish a treatment plan, simulate various treatment procedures, and create a treatment planning delivery device. Clinicians can design and simulate a patient's smile on the virtual patient dataset and select the optimal result from the diagnostic process. The selected treatment plan can be delivered identically to the patient using manufacturing techniques such as 3D printing, milling, and injection molding. The delivery of this treatment plan can be linked to the final prosthesis through mockup confirmation through provisional restoration fabrication and delivery in the patient's mouth. In this way, if the diagnostic data superimposition and processing accuracy during the manufacturing process are guaranteed, 3D digital smile design simulated in 3D visualization can be accurately delivered to the real patient. As a clinical application method of the virtual patient dataset, we suggest a decision-making method that can exclude occlusal adjustment treatment from the treatment plan through the digital occlusal pressure analysis. A comparative analysis of whole-body scans before and after temporomandibular joint treatment was suggested for adolescent idiopathic scoliosis patients with temporomandibular joint disease. Occlusal plane and smile aesthetic analysis based on the virtual patient dataset was presented when treating patients with complete dentures.

• Journal of Korean society of Dental Hygiene
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• v.2 no.2
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• pp.215-225
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• 2002

Objectives: Dental personnels have high chances of exposure to various infections during many dental procedures. This study was performed to investigate the state of infection control in the private dental clinics and prevention state of hepatitis B virus infection among the dental hygiene students in Kwanju city, Korea. Methods: Questionnaires were obtained from 94 dental hygiene students who participated in dental practice in private dental clinics for more than five weeks. Results: 83.9% of dentists and 17.2% of dental hygienists routinely used the mask for treating all patients, 32.3% of dentists and 6.5% of dental hygienists routinely used the rubber gloves. The use of protective eyeware was much lower in each group. Disinfectant was used in 52.7% for sanitization of dental instruments before cleansing. The prevalence of HBsAg and anti-HBs were 3.8% and 67.1% respectively, 52.7% of dental hygiene students had history of accidental needle stick. Conclusion: Routine use of personal barrier techniques by dental personnels should be emphasized. Dental hygiene students were not properly immunized against hepatitis B virus and had high incidence of accidental needle stick. It is necessary to establish specific regulations or recommendations for cross infection control in dental practice and to performed scheduled vaccination program for hepatitis B virus for dental hygiene students.

• The Journal of Advanced Prosthodontics
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• v.10 no.6
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• pp.395-400
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• 2018

PURPOSE. This study tried to find the most significant factors predicting implant prognosis using machine learning methods. MATERIALS AND METHODS. The data used in this study was based on a systematic search of chart files at Seoul National University Bundang Hospital for one year. In this period, oral and maxillofacial surgeons inserted 667 implants in 198 patients after consultation with a prosthodontist. The traditional statistical methods were inappropriate in this study, which analyzed the data of a small sample size to find a factor affecting the prognosis. The machine learning methods were used in this study, since these methods have analyzing power for a small sample size and are able to find a new factor that has been unknown to have an effect on the result. A decision tree model and a support vector machine were used for the analysis. RESULTS. The results identified mesio-distal position of the inserted implant as the most significant factor determining its prognosis. Both of the machine learning methods, the decision tree model and support vector machine, yielded the similar results. CONCLUSION. Dental clinicians should be careful in locating implants in the patient's mouths, especially mesio-distally, to minimize the negative complications against implant survival.

• The korean journal of orthodontics
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• v.42 no.5
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• pp.242-248
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• 2012

Objective: The aim of this study was to compare the success rates of the manual and motor-driven mini-screw insertion methods according to age, gender, length of mini-screws, and insertion sites. Methods: We retrospectively reviewed 429 orthodontic mini-screw placements in 286 patients (102 in men and 327 in women) between 2005 and 2010 at private practice. Age, gender, mini-screw length, and insertion site were cross-tabulated against the insertion methods. The Cochran-Mantel-Haenszel test was performed to compare the success rates of the 2 insertion methods. Results: The motor-driven method was used for 228 mini-screws and the manual method for the remaining 201 mini-screws. The success rates were similar in both men and women irrespective of the insertion method used. With respect to mini-screw length, no difference in success rates was found between motor and hand drivers for the 6-mm-long mini-screws (68.1% and 69.5% with the engine driver and hand driver, respectively). However, the 8-mmlong mini-screws exhibited significantly higher success rates (90.4%, p < 0.01) than did the 6-mm-long mini-screws when placed with the engine driver. The overall success rate was also significantly higher in the maxilla (p < 0.05) when the engine driver was used. Success rates were similar among all age groups regardless of the insertion method used. Conclusions: Taken together, the motor-driven insertion method can be helpful to get a higher success rate of orthodontic mini-screw placement.

• 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 the Korean Academy of Esthetic Dentistry
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• v.17 no.1
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• pp.7-14
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• 2008

치아의 공간 분배 및 배열은 심미적인 수복물의 가장 근본이 되는 중요한 요소이다. 상악 전치부에 과도한 공간으로 심미적으로 부적절한 수복물을 가진 중례에서 기능적으로 그리고 심미적으로 개선시키기 위해 무엇을 고려하고 어떻게 접근하였는지 증례를 통해 반성해보고자 한다.

• The Korean Journal of Health Service Management
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• v.14 no.1
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• pp.67-78
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• 2020

Objectives: Using data from the 1styear of the 7th National Health and Nutrition Survey, this study administered a questionnaire to patients with oral damage and examined the type of medical care used based on the nature of the injury, further characterized by age group and sex. Methods: Of the 8,150 respondents, this study selected those who participated in the health survey and oral exam survey, excluding surveys with missing values, and set 7,681 people as the research participants. This study used SPSS Windows version 23.0(SPSS Inc. IL, USA) as the statistics program and applied the chi-square test (p) based on a complex sample and logistic regression analysis. Results: In the analysis of the type of tooth damage, there was a significant difference (p<.001) in the number of male patients who were injured due to exercise, violence, and safety accidents compared to females. However, there was no significant difference in their type of medical security and whether or not they visited a dental clinic. The patients with private insurance showed relatively high use for tooth extraction and oral surgery (p<.001). Conclusions: The best way to prevent tooth damage is to prevent the accident. For sports or exercises which may cause tooth damage, protective gear, such as a mouthpiece, should be used to prevent tooth damage.

• Restorative Dentistry and Endodontics
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• v.32 no.2
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• pp.102-110
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• 2007

The purpose of this study was to obtain the basic information for the improvement of dental environment by investigating the presence of methicillin- or vancomycin-resistant Staphylococcus aureus (MRSA or VRSA) isolated from dental health care workers (DHCWs) and environment of the Chosun University Dental Hospital (CUDH) and a private dental clinic (control group). Staphylococcus aureus (S. aureus) was isolated from anterior nares of 42 DHCWS and 38 sites, unit chairss, x-ray devices, computers, etc., at 10 departments of the CUDH and 20 DHCWs and 11 sites at the private dental clinic. S. aureus was isolated on mannitol salt agar plate and confirmed by PCR with S. aureus species-specific primer. Antimicrobial susceptibility test of clinical isolates of S. aureus against several antibiotics including methicillin (oxacillin) was performed by investigating minimum inhibitory concentration (MIC) using broth microdilution assay. In addition, PCR was performed to detect the methicillin- or vancomycin-resistant gene. The data showed that one strain of S. aureus was isolated from DHCWs of the CUDH and three strains of S. aureus was isolated from 3 samples of the private dental clinic, respectively. All of the isolates from the CUDH and the private dental clinic had resistance to penicillin G, amoxicillin and vancomycin and susceptibility to oxacillin and ciprofloxacin. The S. aureus strains were already obtained the resistance to penicillin G and amoxicillin. These results suggest that two dental clinics were under relatively safe environment.

• Journal of The Korea Institute of Healthcare Architecture
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• v.23 no.3
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• pp.19-27
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• 2017

Purpose: The characteristics of site plan and space configuration of public dentistry through examining the public dental healthcare centers for the disabled in Korea and comparison between them are necessary for the development of planning of the dental healthcare system. This study has been started to provide basic informations such as nationwide distribution, site relationship, and space configuration for the planning of public dental hospital architecture. Methods: Literature review of publicness and public dental healthcare and investigation on current status of public dental healthcare center for the disabled in Korea have been conducted. The site plan and space configuration of eight public healthcare centers for the disabled have been analyzed. Results: The result of this study can be summarized in three points. The first one is that public dentistry in Korea are distributed public dental hospital for the disabled in Seoul and public dental healthcare centers for the disabled in eight provinces. The second one is that the types of the dental healthcare center for the disabled are divided with remodeling type which is diverted from existed dental or medical out patient clinic space or independent building type which is planned with a new and exclusive usage for the disabled. The third one is that the space configuration of dental healthcare center for the disabled is needed more required programs, larger treatment unit space, and more private clinic space than typical dental treatment plan. Implications: This study is the starting point for the research of public dentistry and it is necessary to analyze the dental prevention and dental public policy to develop the public dental healthcare system.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.28 no.1
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• pp.4-17
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• 2019

Nowadays, Cone-Beam CT is widely supplied in dental clinics, the distribution rate in south korea is highly ranked worldwidely. Recently, The number of Cone-Beam CTs reached 10 thousands according to national healthcare system report. Also, dental manufacturers released many kinds of In-house 3D digital printers, the distribution rate of which rises rapidly in dental clinics. Accordingly, using Cone-Beam CT data and Intraloral scan data, the application of implant guide surgery is widespread in a unit of private clinic. Through the previous articles, the latest methods of computer-guided implant surgery are reviewed, and also the considerations for precise and reliable guide surgery are summarized.