• Imaging Science in Dentistry
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• 제40권2호
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• pp.93-97
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• 2010

This report was to show the radiographic appearances of the fungus ball in a paranasal sinus and to emphasize the scan area of cone beam computed tomography (CBCT) to detect the calcification in the paranasal sinus. A seventyfour-year-old woman visited our department for the implant rehabilitation at both maxillary posterior edentulous region. Pre-operative radiographic examinations including the panoramic, CBCT, and multidector CT images were taken. An opacification in the right maxillary sinus was observed on the multiplanar image of CBCT, however the pre-determined scan area of CBCT in this report hardly showed the calcifications at the central portion of the maxillary sinus. The opacification in the maxillary sinus could be misdiagnosed as chronic maxillary sinusitis if the calcification of fungus ball was not simultaneously detected. The scan area of pre-operative CBCT needs to be enough to scan the paranasal sinus from top to bottom.

• Journal of Oral Medicine and Pain
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• 제44권3호
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• pp.140-144
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• 2019

Actinomycosis is rare, chronic, slowly progressive disease caused by gram-positive anaerobic organisms from the Actinomycosis family that normally colonizes the oral cavity. Actinomycotic osteomyelitis is even more rare and refractory disease because diagnosis by bacterial culture is not easy. In our case, 80-year-old man visited our clinic with a complaint of swelling and severe sinus tracts without teeth evolvement on anterior mandible. Computed tomography (CT) scan demonstrated erosive bone destruction on anterior mandible, clinically suspected actinomycotic osteomyelitis. The patient also had thoracic actinomycosis on Lt. lower lung. We could diagnosis actinomycosis by histopathologic examination. He treated by conservative surgery and long term antibiotics. After 2 year, no recurrence was seen in CT scan.

• Imaging Science in Dentistry
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• 제33권4호
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• pp.199-205
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• 2003

Purpose: To compare the visibility of the mandibular canal at the different radiographic methods such as conventional panoramic radiographs, Vimplant multi planar reformatting (MPR)-CT panoramic images, Vimplant MPR-CT paraxial images and film-based DentaScan MPR-CT images. Materials and Methods: Data of 11 mandibular dental implant patients, who had been planned treatment utilizing both panoramic and MPR-CT examination with DentaScan software (GE Medical systems, Milwaukee, USA), were used in this study. The archived axial CT data stored on CD-R discs were transferred to a personal computer with 17' LCD monitor. Paraxial and panoramic images were reconstructed using Vimplant software (CyberMed Inc., Seoul, Korea). Conventional panoramic radiographs, monitor-based Vimplant MPR-CT panoramic images, monitor-based Vimplant MPR-CT paraxial images, and film-based DentaScan MPR-CT images were evaluated for visibility of the mandibular canal at the mental foramen, 1 cm, 2 cm, and 3 cm posterior to mental foramen using the 4-point grading score. Results: Vimplant MPR-CT panoramic, paraxial, and DentaScan MPR-CT images revealed significantly clearer images than conventional panoramic radiographs. Particularly at the region 1 em posterior to mental foramen, conventional panoramic radiographs showed a markedly lower percentage of 'excellent' mandibular canal images than images produced by other modalites. Vimplant MPR-CT and DentaScan MPR-CT images did not show significant difference in visibility of the mandibular canal. Conclusion: The study results show that Vimplant and DentaScan MPR-CT imaging systems offer significantly better images of the mandibular canal than conventional panoramic radiograph.

• Journal of Oral Medicine and Pain
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• 제30권1호
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• pp.57-67
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• 2005

저자는 2000년 1월부터 2003년 12월까지 부산대학교병원 구강내과에 측두하악관절장애를 주소로 내원한 환자 중 임상검사와 방사선검사를 시행하여 측두하악관절의 골관절염으로 진단되어, 초진 시와 종결 시에 골스캔과 SPECT를 각각 촬영한 환자 27명을 대상으로 골스캔의 SUR 와 SPECT의 온점의 개수를 치료 전, 후로 비교하고 병력, 기여요인, 증상, 치료방법, 치료기간 등을 기준으로 골스캔의 SUR 과 SPECT의 온점의 개수를 비교 연구하여 다음과 같은 결과를 얻었다. 1. 골관절염에 이환된 관절군에서 치료 전 골스캔의 SUR 과 SPECT의 온점의 개수가 골관절염에 이환되지 않은 관절군에 비해 유의하게 높은 소견을 보였다(P<0.05). 2. 골관절염에 이환된 관절에서 치료 전 골스캔의 SUR 과 SPECT 온점의 개수가 보존적 치료 후에 유의하게 감소하였다(P<0.01). 3. 교합장치를 이용해서 치료한 군에서 골스캔의 SUR 과 SPECT 온점의 개수가 치료 후에 유의하게 감소하였다(P<0.01,P<0.05). 4. 만성군에서 치료 전 골스캔의 SUR 과 SPECT의 온점이 치료 후에 유의하게 감소하였다(P<0.05). 5. 관절음에 대한 불편감 정도가 낮은 환자군의 치료 전 골스캔의 SUR과 SPECT의 온점의 개수가 치료 후에 유의하게 감소하였다(P<0.01). 6. 외상 병력이 없고, 악습관이 있고, 정신사회적 배경이 없는 환자일수록 골스캔의 SUR과 SPECT의 온점의 개수가 치료전에 비해 치료후에 현저히 낮았다. 7. 초진 시 골스캔의 SUR과 SPECT의 온점의 개수가 높을수록 많은 치료기간이 필요하다.

• 구강회복응용과학지
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• 제23권1호
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• pp.21-30
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• 2007

Despite of the successful clinical performance of implants, it is still lacking of the knowledge of changes in implant occlusion. The purpose of this study was to evaluate the changes of infraocclusal contact after clinical occlusal function of implant. Twenty patients(38 implants) were recalled during 10 months after placement of implant prosthesis. Occlusion changes were investigated at placement, placement 1 months, 4 months and 10 months serially with silicone bite material and T-Scan II sensor. Bony changes were also evaluated with periapical radiographs. The changes of silicone thickness and T-Scan II sensored areas were statistically analyzed with repeated measured ANOVA and the Scheffe's post-hoc test at the 95% significance level. The following results have been made based on this study: 1. Alveolar bone loss was within 0.20mm and it was generally concluded within physiologic level. 2. There were no statistically significant differences in the thickness changes of silicone material at 1 month and 4 months of occlusal function. However, there was statistically significant difference at 10 months of occlusal function (p<0.05). 3. There was no statistically significant difference in changes of occlusal contact area in T-Scan II at 1 month and 4 months of occlusal function, but there was statistically significant difference at 10 months of occlusal function (p<0.05). Conclusively, as time goes by, implant occlusion to be formed infraocclusion was to be far close and increased occlusal contact. However, it was not observed destructive bone resorption in periapical radiographs and any other side effects.

• Journal of Oral Medicine and Pain
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• 제48권1호
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• pp.31-36
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• 2023

This report presents the case of a 14-year-old male with rheumatoid arthritis (RA) in both temporomandibular joints (TMJs), in whom a bone scan and laboratory tests were used to confirm the diagnosis. The patient visited the Department of Orofacial Pain and Oral Medicine at the affiliation hospital with a complaint of a 1-year history of bilateral TMJ pain and sound. Clinical examination revealed bilateral TMJ and masseter muscle pain during mouth opening and palpation. Radiological examination revealed no significant morphological changes in either TMJ. The patient was prescribed medications at the first visit to address the pain, inflammation, and stiffness. A bone scan and laboratory tests were planned/scheduled for differential diagnosis between simple arthralgia and osteoarthritis. The bone scan revealed increased radiotracer uptake in both TMJs. The laboratory tests revealed a RA factor of 82.4 IU/mL, which is more than four times the normal range. The final diagnoses were bilateral TMJ early rheumatoid arthritis (ERA) and juvenile idiopathic arthritis. We created a stabilization splint and referred the patient to the Department of Rheumatology for further evaluation of the ERA. After fitting of the stabilization splint and giving instructions regarding its use, the patient has been receiving monthly follow-up checks for symptoms and undergoes follow-up blood tests every 3 months. About 14 months after the initial visit, the pain had significantly decreased from a Visual Analog Scale score of 5 to 1, and the RA factor decreased to 66.6 IU/mL. A regular follow-up check will continue until the end of growth.

• 대한치과의사협회지
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• 제57권7호
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• pp.380-391
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• 2019

In recent years, with the introduction of various restorative materials, restorations using CAD/CAM equipment have been increasing in the esthetic dentistry. The critical steps in the fabrication of indirect restorations with CAD/CAM equipment are proper cavity preparation and making accurate impressions. The process of tooth preparation for CAD/CAM restoration should include a mechanical understanding of milling. In addition, during tooth preparation, the clinician should be familiar with additional equipment and techniques for obtaining the convenience. In order to obtain an accurate oral scan, the clinician should understand the limitations of the oral scan and be skilled at techniques for obtaining a successful image when making oral scans. This article focused clinical guidelines for the preparation of CAD/CAM restorations and introduced clinical methods for making successful impression of oral scans in narrow and deep tooth cavity areas.

• Imaging Science in Dentistry
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• 제41권2호
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• pp.59-62
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• 2011

Purpose : This study was performed to evaluate the changes of jaw bone density around the dental implant after placement using computed tomography scan (CT-Scan). Materials and Methods : This retrospective study consisted of 30 patients who had lost 1 posterior tooth in maxilla or mandible and installed dental implant. The patients took CT-Scan before and after implant placement. Hounsfield Unit (HU) was measured around the implants and evaluated the difference of HU before and after implant installation. Results : The mean HU of jaw bone was 542.436 HU and 764.9 HU before and after implant placement, respectively (p<0.05). The means HUs for male were 632.3 HU and 932.2 HU and those for female 478.2 HU and 645.5 HU before and after implant placement, respectively (p<0.05). Also, the jaw bone with lower density needed longer period for implant procedure and the increased change of HU of jaw bone was less in the cases which needed longer period for osseointegration. Conclusion : CT-Scan could be used to assess the change of bone density around dental implants. Bone density around dental implant was increased after placement. The increased rate of bone density could be determined by the quality of jaw bone before implant placement.

• 구강회복응용과학지
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• 제29권1호
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• pp.45-58
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• 2013

교합접촉 분석에 이용되는 T-Scan $III^{(R)}$ (Tekscan, South Boston, MA, USA)의 정확도 및 신뢰도를 Add picture 방법을 통해 평가하였다. 두 방법에서 공통적인 교합접촉점의 분포 및 교합접촉면적을 비교하여 교합진단 및 조정 술식에서 T-Scan 방법의 적용 시 고려점을 밝히고자 하였다. Angle I급 교합관계, 정상치열자 한 사람의 구강을 대상으로 부가중합형 실리콘인상재를 이용하여 상하악치열궁을 10회 인상채득하였으며, 10쌍의 초경석고 모형을 제작하였다. 자체제작한 하중장치에 모형을 자석과 경석고를 이용하여 부착한 후 최대감합위와 최대교합력을 재현하기 위해 78.9kg의 하중을 가하였다. T-Scan 측정 시에는 상하악 모형과 T-Scan 센서의 위치가 변하지 않는 상태에서 2번 반복 측정하였다. Add Picture의 경우 상하악모형을 동일한 하중을 가하여 최대감합위에서 폴리이써 교합인기재를 이용하여 교합을 인기하였다. 교합접촉 양상은 접촉점 수와 총 교합면적에 대한 접촉면적 백분율을 측정하여 비교하였다. T-Scan 방법은 포토샵 프로그램 상에서 픽셀수를 계산하여 색상에 따른 면적을, Add picture 방법은 빛 투과 정도에 따라 인상재 두께를 $0{\sim}10{\mu}m$, $0{\sim}30{\mu}m$, $0{\sim}60{\mu}m$의 3가지로 나누고, 이에 따른 면적을 실측하여 계산하였다. 총 교합면면적은 접촉면을 표시한 모형의 촬영상에서 픽셀수를 계산하여 함께 촬영된 격자를 기준으로 제곱미터값으로 변환하였다. 대응표본 t-검정을 이용하여 통계분석하였다. T-Scan 방법에서 분홍색상 및 붉은 색상으로 표시된 면적의 일부가 Add picture 방법에서 $0{\sim}10{\mu}m$, $0{\sim}30{\mu}m$, $0{\sim}60{\mu}m$의 상하악 치아 간 거리에 해당하는 면적에 상응하였다. 교합접촉점 분포 비교 시 T-Scan 방법과 Add picture 방법은 유사하였다. 교합접촉면적 비교 시 T-Scan 방법에서 확대된 결과가 관찰되었으며, 전체교합면적에 대한 접촉면적 백분율 비교에서도 T-Scan 방법과 Add picture 방법의 백분율값은 유의한 차이를 보였다(P<.05). T-Scan에서 분홍색상 및 붉은 색상으로 표시된 부위의 면적값은 Add picture의 $0{\sim}10{\mu}m$, $0{\sim}30{\mu}m$ 부위의 면적값보다 크고(P<.05), $0{\sim}60{\mu}m$ 부위와는 유사한 값을 보였다(P>.05). T-Scan에서의 교합접촉상은 실제보다 확대되어 나타났으며, 따라서 교합접촉에 대한 진단 및 조정 술식에서 보조적인 수단으로 활용하는 것이 추천된다.

• Journal of Oral Medicine and Pain
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• 제37권2호
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• pp.125-133
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• 2012

측두하악관절 골관절염은 관절조직에 가해지는 과부하에 의해 관절면과 하부 골조직에서 일련의 퇴행성과정과 함께 관절부의 국소적 압통, 하악운동에 의한 관절의 염발음, 하악의 운동범위 제한, 심한 경우에는 과두지지가 없어져 구치부 과다접촉과 전치부 개교합이 나타날 수 있는 퇴행성질환이다. 일반적으로는 임상검사 후 파노라마방사선사진, 측두하악관절 파노라마, 경두개방사선사진을 촬영한 뒤 진단하게 되는데 이들 일반적인 방사선사진들은 질환 초기의 미세한 골변화를 평가하는데 제한적이다. 따라서 본 연구에서는 일반방사선학적 검사에서 골조직의 퇴행성변화가 의심되어 확진을 위해 단층촬영 및 골스캔 검사를 시행한 환자의 영상의학적 검사소견들 간의 일치도와 임상소견과의 관계를 평가하여 골관절염의 진단에서 이들 다양한 검사법들의 한계와 그 유용성을 평가하고 향후 추가연구를 위한 예비자료를 얻기위해 시행하였다. 골관절염의 진단에서 일반방사선사진과 단층촬영, 골스캔 검사의 결과 일치도가 비교적 높게 나타났지만 위음성 가능성이 존재하므로 임상검사소견에 따른 단계적인 영상의학적 검사 시행이 바람직할 것으로 사료된다.