• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.13.1-13.12
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• 2016

Background: Mandibular motion tracking system (ManMoS) has been developed for orthognathic surgery. This article aimed to introduce the ManMoS and to examine the accuracy of this system. Methods: Skeletal and dental models are reconstructed in a virtual space from the DICOM data of three-dimensional computed tomography (3D-CT) recording and the STL data of 3D scanning, respectively. The ManMoS uniquely integrates the virtual dento-skeletal model with the real motion of the dental cast mounted on the simulator, using the reference splint. Positional change of the dental cast is tracked by using the 3D motion tracking equipment and reflects on the jaw position of the virtual model in real time, generating the mixed-reality surgical simulation. ManMoS was applied for two clinical cases having a facial asymmetry. In order to assess the accuracy of the ManMoS, the positional change of the lower dental arch was compared between the virtual and real models. Results: With the measurement data of the real lower dental cast as a reference, measurement error for the whole simulation system was less than 0.32 mm. In ManMoS, the skeletal and dental asymmetries were adequately diagnosed in three dimensions. Jaw repositioning was simulated with priority given to the skeletal correction rather than the occlusal correction. In two cases, facial asymmetry was successfully improved while a normal occlusal relationship was reconstructed. Positional change measured in the virtual model did not differ significantly from that in the real model. Conclusions: It was suggested that the accuracy of the ManMoS was good enough for a clinical use. This surgical simulation system appears to meet clinical demands well and is an important facilitator of communication between orthodontists and surgeons.

• 한국치위생학회지
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• 제21권5호
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• pp.655-666
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• 2021

Objectives: A systematic review and a meta-analysis were performed investigate the factors related to turnover intention of dental hygienists in Korea. Methods: Literature between 2000 and January 2021 were used to support the meta-analysis, which focused on 21 factors extracted from 50 articles using a random effects model. The correlation coefficient, r, in the effect size was calculated. Results: Substantial literature was published after 2011 (76%); in academic journals (74%); and targeted nonmetropolitan areas (40%). Lawler's turnover intention tool was used in several studies. The effect size for each ecosystem was in the order of microsystem (r=0.325), mesosystem (r=0.307), macrosystem (r=0.259), exosystem (r=0.176), and individuals (r=0.171). The random-effects model indicated an overall average of r=0.311. The factor that showed a large effect size in relation to turnover intention was organizational commitment of the microsystem (r=-0.594). Furthermore, mesosystem reward (r=- 0.416), microsystem burnout (r=0.464), job stress (r=0.408), and job satisfaction (r=-0.405) were identified as other major factors. Conclusions: To lower the turnover rate of dental hygienists, it is important to focus on factors belonging to the microsystem, and mesosystem reward.

• International Journal of CAD/CAM
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• 제8권1호
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• pp.41-44
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• 2009

This paper describes an implementation of virtual teeth modeling for a haptic dental simulation. The system allows dental students to practice dental procedures with realistic tactual feelings. The system requires fast and stable haptic rendering and volume modeling techniques working on the virtual tooth. In our implementation, a volumetric implicit surface is used for intuitive shape modification without topological constraints and haptic rendering. The volumetric implicit surface is generated from input geometric model by using a closest point transformation algorithm. And for visual rendering, we apply an adaptive polygonization method to convert volumetric teeth model to geometric model. We improve our previous system using new octree design to save memory requirement while increase the performance and visual quality.

• 대한치과의사협회지
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• 제56권6호
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• pp.339-347
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• 2018

Conventional mouthguard fabrication process which consists of elastomeric impression taking and followed gypsum model making is changing into intraoral scanning and dental model printing with 3D printer. In addition, new 3D printing materials for mouthgurad, 3D Computer-Aided Design(CAD) software for dental appliance, evaluation of a virtual dentoalveolar model for testing virtually 3D designed mouthguard, and lightweight sensor technology will lead dental professionals to the new era of Sports Dentistry, including information technology integrated custom mouthguard fabrication and creating value with analytic data acquired from sensors in mouthguard.

• The Journal of Advanced Prosthodontics
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• 제14권2호
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• pp.63-69
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• 2022

PURPOSE. The aim of this in vitro study was to investigate the accuracy (trueness and precision) of five intraoral scanners (IOS) using a novel reference model for standardized performance evaluation. MATERIALS AND METHODS. Five IOSs (Medit i500, Omnicam, Primescan, Trios 3, Trios 4) were used to digitize the reference model, which represented a simplified full-arch situation with four abutment teeth. Each IOS was used five times by an experienced operator, resulting in 25 STL (Standard Tessellation Language) files. STL data were imported into 3D software (Final Surface^®) and examined for inter- and intra-group analyses. Deviations in the parameter matching error were calculated. ANOVA F-test and Kruskal-Wallis test were applied for inter-group comparisons (α = .05); and the coefficient of variation (CV) was calculated for intra-group comparisons (in % ± SD). RESULTS. Primescan (matching error value: 0.015), Trios 3 (0.016), and Trios 4 (0.018) revealed comparable results with significantly higher accuracy compared to Medit i500 (0.035) and Omnicam (0.028) (P < .001). For intra-group comparison, Trios 4 demonstrated the most homogenous results (CV 15.8%). CONCLUSION. The novel reference model investigated in this study can be used to assess the performance of dental scanning technologies in the daily routine setting and in research settings.

• 한국치위생학회지
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• 제23권4호
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• pp.287-293
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• 2023

Objectives: In this study, dental hygienists' perceptions of dental hygienists' communication and general public's mutual perceptions were compared to seek development directions and plans for improving dental hygienists' communication skills, and furthermore, communication to increase satisfaction between the general public and dental hygienists. This study was conducted to provide basic data on the development and direction of competency improvement education. Methods: From April 1 to April 31, 2023, a survey was conducted through an online link for the general public with dental treatment experience and dental hygienists currently working at dentists in Gwangju and Jeonnam. A total of 258 questionnaires were collected. Independence t-test and paired t-test were performed using SPSS Statistics (ver. 21.0; IBM Corp., Armonk, NY, USA) Results: As a result of analyzing the accuracy of the communication ability of dental hygienists, from the dental hygienist's point of view, general publics perceived that the dental hygienist's underestimation of their own communication ability was actually lower than the dental hygienist's underestimated communication ability. From the general public's point of view, dental hygienists overestimated their communication ability. In fact, dental hygienists perceived their general publics as higher than general public's overestimated communication ability. Conclusions: Based on these results, it is necessary to develop education and operate various educational programs to improve the communication skills of dental hygienists, and to rethink educational accessibility to increase participation in education and to publicize the professionalism of dental hygienists.

• 치위생과학회지
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• 제24권1호
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• pp.22-28
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• 2024

Background: Particulate matter (PM) has been extensively observed due to its negative association with human health. Previous research revealed the possible negative effect of air pollutant exposure on oral health. However, the predictive model between air pollutant exposure and the prevalence of periodontitis has not been observed yet. Therefore, this study aims to propose a predictive model for the number of patients with periodontitis exposed to PM and atmospheric factors in South Korea using deep learning. Methods: This study is a retrospective cohort study utilizing secondary data from the Korean Statistical Information Service and the Health Insurance Review and Assessment database for air pollution and the number of patients with periodontitis, respectively. Data from 2015 to 2022 were collected and consolidated every month, organized by region. Following data matching and management, the deep neural networks (DNN) model was applied, and the mean absolute percentage error (MAPE) value was calculated to ensure the accuracy of the model. Results: As we evaluated the DNN model with MAPE, the multivariate model of air pollution including exposure to PM_2.5, PM₁₀, and other atmospheric factors predict approximately 85% of the number of patients with periodontitis. The MAPE value ranged from 12.85 to 17.10 (mean±standard deviation=14.12±1.30), indicating a commendable level of accuracy. Conclusion: In this study, the predictive model for the number of patients with periodontitis is developed based on air pollution, including exposure to PM_2.5, PM₁₀, and other atmospheric factors. Additionally, various relevant factors are incorporated into the developed predictive model to elucidate specific causal relationships. It is anticipated that future research will lead to the development of a more accurate model for predicting the number of patients with periodontitis.

• 한국응용과학기술학회지
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• 제35권3호
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• pp.587-594
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• 2018

본 연구의 목적은 치과종사자의 손씻기에 대한 건강신념과 손씻기 수행도 간의 관련성을 파악하여 평가하는 것이다. 본 연구는 치과의원, 치과대학병원에서 근무하는 140명의 치과종사자를 대상으로 구조화된 설문지를 사용하여 자가보고식으로 작성하도록 하였다. 모든 자료는 통계분석은 t검정, 일원분산 분석, Pearson 상관계수분석으로 통계처리 하였다. 손씻기 수행도는 손씻기에 대한 건강신념과 r=0.285로 양의 상관관계를 보였다(p<0.01). 치과의원, 치과대학병원에서 근무하는 치과종사자의 병원감염 예방을 실천하기 위해서는 감염관리 교육 시 지각된 민감성, 지각된 심각성, 지각된 유익성, 지각된 장애성, 수행을 위한 동기로 구성된 손씻기에 대한 건강신념을 고려하고, 지속적인 손씻기 교육을 시행한다면 치과종사자의 손씻기 수행도도 증가할 것으로 사료된다.

• 치위생과학회지
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• 제10권1호
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• pp.45-54
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• 2010

본 연구는 일반치과환자의 대상으로 일반적 특성에 따른 치과 의료기관 선택요인에 관한 중요도와 치과의원과 치과병원의 선택에 중요한 영향을 미치는 정보를 제공하고자 2009년 8월부터 9월까지 조사 한 것으로 SAS(ver 9.1)분석결과 다음과 같은 결론을 얻었다. 1. 일반적 특성에 따른 치과의료기관 선택요인에 관한 중요도를 비교한 결과 연령대에 따 라서 거리, 교통, 주차편리 같은 거동이나 이동성의 편리를 중요하게 생각하고, 최종 학력에 따라서는 치과소문요인의 중요도가 높으며,(p<0.05) 직업에 따라서는 치과소문, 주차편리의 중요도에 유의한 차이가 나타났다.(p<0.05) 소득에 따라서는 전문의 수련 여부요인이 200만원 미만인 집단보다 500만원이상인 집단이 통계적으로 높게 나타났다.(p<0.05) 2. 대상 치과의원을 방문한 환자들의 방문경로는 소문이 23.7%로 가장 많았으며 다음으로 의료진 및 직원의 소개, 가족의 권유가 각각 17.7%로 나타났는데 이는 인터넷이 발달해 있는 지금도 소문이나 가족의 권유 등 구전의 효과가 크다는 것을 알 수 있다. 3. 추천도에 영향을 미치는 요인에서는 Model I에서는 의료진 실력 우수(p=0.013), 의료 정보 획득 편리(p=0.014), 예약제도 편리(p=0.029), 최신시설(p=0.001), 고가 치료비(p=0.027)은 통계적으로도 유의한 결과를 보였으며, Model II에서는 인테리어(p=0.009), 치과 이름(p=0.027)은 통계적으로도 유의한 결과를 보였다. 4. 재이용 의사에 영향을 미치는 요인에서는 Model I에서는 의료정보 획득편리(OR=0.64)와 고가의 치료비(OR=1.74)가 통계적으로 유의한 결과를 보였으며, Model 에서는 야간 및 공휴일 진료여부(OR=1.47)가 통계적으로 유의한 결과를 보였다.

• 대한치과의사협회지
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• 제39권10호통권389호
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• pp.849-853
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• 2001