• 한국산학기술학회논문지
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• 제16권1호
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• pp.564-575
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• 2015

본 연구는 치위생(학)과 학생들의 진로방향에 대한 기준제시와 치과위생사의 바람직한 이미지 구축에 필요한 기초자료를 마련하고자 대구 경북지역 소재 대학 치위생(학)과 재학생을 대상으로 자기기입식 설문조사를 실시하였다. 자료 수집은 2013년 2월부터 2013년 5월까지 수행하였고, 수집된 자료 중 응답이 불성실한 46부의 설문지를 제외한 1,679부를 SPSS/Win18.0을 사용하여 최종 분석하였고, 다음과 같은 결론을 얻었다. 선택후회와 진학추천의 경우 1학년이 2, 3, 4학년보다 높았고, 전과의지는 3, 2, 4학년이 1학년보다 높은 것으로 나타나, 저학년일수록 진학만족도가 높았다. 희망진로는 모든 학년에서 치과위생사로의 취업이 높았고, 취업 희망경로는 1학년의 경우 교수추천, 2학년, 3학년, 4학년의 경우 공개채용이 높았다. 취업희망 지역은 대도시, 선택이유는 발전가능성이 높았다. 취업 희망기간은 모든 학년에서 결혼 전, 자녀성장 후 재취업이 높았고, 희망근무처는 1학년 대학병원치과, 2학년, 3학년, 4학년의 경우 치과병원이 높았다. 학년에 따른 치위생사 이미지 차이에서 태도의 경우 1, 2학년이 3학년보다 높았고, 신념은 1, 2학년이 3, 4학년보다 높았으며, 가치는 4학년이 1, 3, 2학년보다, 2, 3학년이 1학년보다 높은 것으로 나타나, 태도와 신념은 저학년일수록, 가치는 고학년일수록 높았다. 진학만족도 요인 중, 전과의지와 진학권유 요인이 치과위생사 이미지에 유의한 영향을 미치는 것으로 나타났다. 치위생(학)과 학생들은 직업에 대한 정체성을 확립하고, 치과위생사의 바람직한 이미지화를 위해 노력해야 할 것이며, 체계적이고, 적극적인 홍보활동을 통하여 치과위생사에 대한 보다 정확하고, 긍정적인 이미지를 높이기 위한 끊임없는 노력이 필요할 것으로 사료된다.

• Imaging Science in Dentistry
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• 제39권3호
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• pp.149-156
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• 2009

Purpose : The purpose of this study was to develop a stent-based image guided surgery system and to apply it to oral and maxillofacial surgeries for anatomically complex sites. Materials and Methods : We devised a patient-specific stent for patient-to-image registration and navigation. Three-dimensional positions of the reference probe and the tool probe were tracked by an optical camera system and the relative position of the handpiece drill tip to the reference probe was monitored continuously on the monitor of a PC. Using 8 landmarks for measuring accuracy, the spatial discrepancy between CT image coordinate and physical coordinate was calculated for testing the normality. Results : The accuracy over 8 anatomical landmarks showed an overall mean of $0.56{\pm}0.16\;mm$. The developed system was applied to a surgery for a vertical alveolar bone augmentation in right mandibular posterior area and possible interior alveolar nerve injury case of an impacted third molar. The developed system provided continuous monitoring of invisible anatomical structures during operation and 3D information for operation sites. The clinical challenge showed sufficient accuracy and availability of anatomically complex operation sites. Conclusion : The developed system showed sufficient accuracy and availability in oral and maxillofacial surgeries for anatomically complex sites.

• 한국CDE학회논문집
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• 제21권3호
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• pp.296-305
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• 2016

This paper proposes a framework to automatically align Dental range image captured by depth sensors like the Microsoft Kinect. Aligning dental images by intraoral scanning technology is a difficult problem for applications requiring accurate model of dental-scan datasets with efficiency in computation time. The most important thing in dental scanning system is accuracy of the dental prosthesis. Previous approaches in intraoral scanning uses a Z-buffer ICP algorithm for fast registration, but it is relatively not accurate and it may cause cumulative errors. This paper proposes additional Alignment using the rough result comes after intraoral scanning alignment. It requires that Each Depth Image of the total set shares some overlap with at least one other Depth image. This research implements the automatically additional alignment system that aligns all depth images into Completed model by computing a network of pairwise registrations. The order of the each individual transformation is derived from a global network and AABB box overlap detection methods.

• 제어로봇시스템학회논문지
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• 제17권3호
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• pp.254-257
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• 2011

This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable lower dental impression trays. Multiple impressions of a resin master model were made with custom, stock and new adjustable trays and vinyl polysiloxane impression material. The lower master model and resulting cast were compared using an dental scanning system. Each 3D image was superimposed onto the lower master model image and analyzed with custom software. Multiple measurements of the lower master model and casts were analyzed to determine the accuracy of tray types.

• 한국융합학회논문지
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• 제9권8호
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• pp.211-217
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• 2018

본 연구는 치위생학과 재학생들의 학업적 자아개념에 미치는 영향요인을 분석하여 치위생 교육 개발에 기초자료를 제공하고자 한다. 대상자 모집 공지를 한 후 참여의사를 밝힌 자에게 본 연구의 목적과 연구방법을 설명하고 이에 동의를 한 치위생학과 재학생 168명을 대상으로 하였다. 2016년 10월 10일~10월 21일까지 설문조사를 실시하였다. 본 연구의 결과, 치과위생사의 직업적 이미지는 전공만족도에 정(+)의 영향(${\beta}=.43$, p<.001)을 미쳤으며, 전공만족도는 학업적 자아개념에 정(+)의 영향(${\beta}=.38$, p<.001)을 미치는 것으로 분석되었다. 따라서 치위생학과 재학생들의 학업적 자아개념을 위해 전공만족도를 높여야 하며 이를 위해 재학생들이 인식하는 치과위생사들의 직업적 이미지를 향상시킬 수 있는 제도적 개선이 필요할 것으로 사료된다.

• 치위생과학회지
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• 제12권1호
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• pp.23-29
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• 2012

본 연구는 치위생과 학생과 일반대학 학생을 대상으로 치과위생사에 대한 이미지와 인지도를 조사하고, 분석하여 대학생활 중에 치과위생사에 대한 올바른 인식을 형성 시키는 것이 필수적이라고 생각하여 광주광역시에 위치한 G대학의 3년제 치위생과와 J 대학의 4년제 학생들에게 설문지를 배부 조사하였다. 수집된 자료를 분석하여 다음과 같은 결과를 얻었다. 1. 치과위생사의 일반적인 인식에 대해 조사한 결과, 치과위생사라는 직업에 관해서는 치위생과 학생들은 97.5%, 일반대학생들은 80.6%가 인지하고 있었고(p<0.001), 치과위생사의 의료법상의 위치에 관한 인식은 치위생과 학생들은 의료기사가 52.8%로 가장 높았으며 일반대학 학생들은 의료보조자가 48.8%로 가장 높게 나타났다. 사회적 지위는 두 집단 모두에서 '보통이다'가 가장 높게 나타났다(p<0.001). 2. 치과위생사의 주요 업무에 관한 인식에 대해 조사한 결과, 치위생과 학생들은 X-ray촬영과 스켈링이 42.3%로 가장 높았고, 일반대학 학생들이 생각하는 주요업무는 치과의사의 진료보조 업무가 32.9%로 가장 높게 나타났다. 3. 치과위생사의 이미지에 관한 인식은 치위생과 학생들은 '전문직이다'라는 인식(4.05)이 가장 높았고, 부정적 이미지(3.05)가 가장 낮게 나타났으며, 일반학과 학생에서도 '전문직이다'라는 인식(3.43)이 가장 높았고, 부정적 이미지(2.91)가 가장 낮게 나타났다. 모든 항목에서 치위생과 학생과 일반대학 학생 간에 유의한 차이가 있었다. 이상의 연구결과를 바탕으로 치위생과 학생들과 일반대학 학생들의 치과위생사에 대한 의료법상 위치에 관한 인식과 주요 업무에 대한 인식 정도가 다르게 나타나는 것을 알 수 있었다. 따라서 일반대학 학생들에게 바람직한 치과위생사의 이미지를 정립하고 치과위생사에 대한 올바른 인식과 업무에 대한 인지도를 높이기 위한 홍보 및 교육이 모두 필요할 것으로 생각된다.

• Imaging Science in Dentistry
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• 제32권2호
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• pp.75-79
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• 2002

Purpose : To evaluate the effect of exposure time and image resolution on fractal dimension calculations for determining the optimal range of these two variances. Materials and Methods : Thirty-one radiographs of the mandibular angle area of sixteen human dry mandibles were taken at different exposure times (0.01, 0.08, 0.16, 0.25, 0.40, 0.64, and 0.80 s). Each radiograph was digitized at 1200 dpi, 8 bit, 256 gray level using a film scanner. We selected an Region of Interest (ROI) that corresponded to the same region as in each radiograph, but the resolution of ROI was degraded to 1000, 800, 600, 500, 400, 300, 200, and 100 dpi. The fractal dimension was calculated by using the tile-counting method for each image, and the calculated values were then compared statistically. Results: As the exposure time and the image resolution increased, the mean value of the fractal dimension decreased, except the case where exposure time was set at 0.01 seconds (α = 0.05). The exposure time and image resolution affected the fractal dimension by interaction (p<0.001). When the exposure time was set to either 0.64 seconds or 0.80 seconds, the resulting fractal dimensions were lower, irrespective of image resolution, than at shorter exposure times (α = 0.05). The optimal range for exposure time and resolution was determined to be 0.08- 0.40 seconds and from 400-1000 dpi, respectively. Conclusion : Adequate exposure time and image resolution is essential for acquiring the fractal dimension using tile-counting method for evaluation of the mandible.

• Imaging Science in Dentistry
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• 제44권2호
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• pp.129-135
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• 2014

Purpose: The objective of this study was to assess the trabecular bone changes that occurred around functional endosseous dental implants by means of radiographic image analysis techniques. Materials and Methods: Immediate preoperative and postoperative periapical radiographs of de-identified implant patients at the University Dental Hospital of Manchester were retrieved, screened for specific inclusion criteria, digitized, and quantified for structural elements of the trabecular bone around the endosseous implants, by using image analysis techniques. Data were analyzed using SPSS version 11.5. P values of less than 0.05 were considered statistically significant. Results: A total of 12 implants from 11 patients were selected for the study, and 26 regions of interest were obtained. There was a significant increase in the bone area in terms of the mean distance between nodes (p=0.006) and a significant decrease in the marrow area in terms of the bone area (p=0.006) and the length of marrow spaces (p=0.032). Conclusion: It appeared that the bone around the implant underwent remodeling that resulted in a net increase in bone after implant placement.

• Journal of Oral Medicine and Pain
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• 제21권2호
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• pp.255-264
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• 1996

This study was performed to demonstrate the method of image reformation for dental implants, using a personal computer with inexpensive softwares and to compare the images reformatted using the above method with those using Dentascan software. CT axial slices of 4 mandibles of 4 volunteers from GE Highspeed Advantage(GE Medical systems, U.S.A.) were used. personal computer used for image reformation was PowerWave 604/120 (Power computing Co, U.S.A. ) and softwares used were Osiris (Univ. Hospital of Geneva, Switzerland) and ImportACLESS Vl.1 (Designed Access Co., U.S.A.) for importing CT images and NIH image 1.58 (NIH, U.S.A.) for image processing. Seven image were selected among the serial reconstructed cross-sectional images produced by Dentascan. Seven resliced cross-sectional images at the same position were obtained at the personal computer. Regression analysis of the measurements of PC group was done against those of DS group. Measurements of the bone height and width at the reformer cross-sectional images using Mac-compatible computer was highly correlated with those using workstation with Dentascan software(height : r2= 0.999, p<0.001, width : r2= 0.993, p <0.001). So, it is considered that we can use a personal computer with inexpensive software for the dental implant planning, instead of the expensive software and workstation.

• Imaging Science in Dentistry
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• 제44권1호
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• pp.31-35
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• 2014

Purpose: This study was performed to investigate the effect of image enhancement of periapical radiographs according to the diagnostic task. Materials and Methods: Eighty digital intraoral radiographs were obtained from patients and classified into four groups according to the diagnostic tasks of dental caries, periodontal diseases, periapical lesions, and endodontic files. All images were enhanced differently by using five processing techniques. Three radiologists blindly compared the subjective image quality of the original images and the processed images using a 5-point scale. Results: There were significant differences between the image quality of the processed images and that of the original images (P< 0.01) in all the diagnostic task groups. Processing techniques showed significantly different efficacy according to the diagnostic task (P< 0.01). Conclusion: Image enhancement affects the image quality differently depending on the diagnostic task. And the use of optimal parameters is important for each diagnostic task.