著者

小松 知広 伊東 浩太郎 村岡 宏隆 平原 尚久 岡田 俊也 一木 俊吾 板倉 剛 金田 隆

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.60, no.2, pp.42-47, 2021 (Released:2021-04-01)

参考文献数

15

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Background and Purpose: In recent years, a titanium-zirconium alloy(Ti-ZrO2)showing improved mechanical properties compared with commercially pure titanium(Ti)has been introduced. On magnetic resonance imaging(MRI), metal artifacts of dental implants often make diagnosis difficult in clinical situations. Therefore, it is very important to compare metal artifacts of Ti and Ti-ZrO2 dental implants using MRI. However, few studies have made this comparison. The purpose of this study was to investigate and compare metal artifacts of titanium and Ti-ZrO2 dental implants. Materials and Methods: The phantom used in this study was composed of a hollow cylinder with an outer diameter of 20.0cm, and a removable rod of 1.0cm in diameter was placed along the phantom’s central axis. Ti and Ti-ZrO2 alloy implants were placed on this rod. All subjects underwent imaging with a 1.5T MR scanner(Intera Achieva® 1.5T: Philips Medical Systems, Best, The Netherlands)with a SENSE head 8-channel coil. The imaging sequences included turbo spin echo(TSE)T1-weighted imaging(T1WI), TSE T2-weighted imaging(T2WI), short tau inversion recovery(STIR), and single shot echo planar imaging diffusion-weighted imaging(DWI). The full width at half maximum (FWHM) of metal artifact in each phase-encoding direction and frequency-encoding was measured on Image J. The Mann-Whitney U test was used to compare FWHM between Ti and Ti-ZrO2 implants. p-values less than 0.05 were considered to indicate significance. Results: The phase-encoding direction and frequency-encoding of FWHM were significantly different between Ti and Ti-ZrO2 implants on T2WI(p <0.01)and DWI(p< 0.05). There was no significant difference between each material on T1WI and STIR imaging. Conclusions: This study suggested that the Ti-ZrO2 implant is affected by metal artifacts less than the Ti implant on MRI.

著者

岡田 成生 上野 泰宏 星 健太郎 伊藤 弘人 神部 芳則 草間 幹夫 小林 馨

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.48, no.1, pp.8-11, 2009-03-31

参考文献数

9

被引用文献数

1

著者

松下 健 林 孝文 伊藤 寿介

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.35, no.3, pp.182-183, 1995-09-30 (Released:2011-09-05)

著者

五十嵐 千浪

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.56, no.2, pp.57-63, 2017 (Released:2017-03-30)

参考文献数

17

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The normal anatomical structural interpretation in the panoramic radiograph is important in clinical dentistry. In this time, it is textbooks published until the present that we use for references, however, widely used anatomical terms are not unification, and there are differences within the textbooks by authors.Purpose: To help the routine dental care, it is to show that the relations of landmarks of the anatomical structures and its terms in the panoramic radiograph.Material & Methods: Using 17 representative textbooks (eleven were Japanese, and six were written in foreign language), we examined relations of anatomical landmarks of the normal image of the panoramic radiograph and the described terms.Results: Cutline in the textbooks and the used anatomical terms were various and were not uniform.

著者

佐々城 真 飯久保 正弘 下里 舞 佐藤 しづ子 笹野 高嗣

出版者

Japanese Society for Oral and Maxillofacial Radiology

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.54, no.1, pp.1-6, 2014 (Released:2014-06-17)

参考文献数

17

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Objective: To clarify the relationship between edematous changes and pain in the masseter muscle, we investigated whether plasma extravasation might be induced in the mouse masseter muscle when muscle fatigue with gnawing behavior occurred.Study design: When a mouse is restrained in a narrow cylinder with blocking at the front end with a thin plastic strip, it gnaws away at the strip to escape. The mice in the experimental group were restrained in such a cylinder for two hours. In a control group, the mice, whose tails were fixed to the cylinder using tape, could not reach the strip and thus could not bite it. Using these models, we examined plasma extravasation by the Evans blue (EB) dye method. Furthermore, to investigate the relationship between masseter muscle pain and plasma extravasation, local anesthesic was injected into the right masseter muscle, with the control side injected with saline alone. Results: The level of EB dye in the masseter muscle of the experimental group was higher than that of the control group. There was a high correlative relationship between the weight reduction of the plastic strip and the EB dye. The level of EB dye at the anesthetized side was significantly decreased compared with that at the saline-injected side.Conclusion: This result suggests that the masseter muscle pain induced by muscle fatigue evokes plasma extravasation, resulting in edematous changes in the masseter muscle.

著者

林 孝文 伊藤 寿介 中山 均 小林 富貴子 中村 太保 小宮 隆瑞 鈴木 誠 福島 祥紘 高木 律男 大橋 靖

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.33, no.2, pp.74-80, 1993-06-30 (Released:2011-09-05)

参考文献数

20

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Carcinomas arising in jaw cysts are a very rare lesion. There was only one case report which was thought to be of origin from an inscisive canal cyst.The authors present a case of squamous cell carcinoma probably arising from an incisive canal cyst.The patient was a 60-year-old female with complaints of swelling and tenderness of the hard palate. Overlying mucosa of the lesion was normal except for an opening of fistula.An occlusal X-ray film and bone images of X-ray computed tomography (X-CT) showed a radiolucent lesion on the midline of the palate with well-defined margin and they also revealed an irregular resorption of the alveolar process of the maxilla.Soft tissue images of post contrast X-CT showed a heterogenously enhanced area in the anterior part of the lesion extending to the left upper lip.Pathological examination revealed a squamous cell carcinoma and suggested that the tumor derived probably from an incisive canal cyst.

著者

玉井 和樹 小林 馨 五十嵐 千浪 小佐野 貴識

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.53, no.3, pp.21-27, 2013 (Released:2013-12-10)

参考文献数

23

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Objective: In recent years, it has been postulated that a change in muscle function is associated with the etiology of obstructive sleep apnea (OSA). Saito and colleagues previously reported the impact of obesity on the properties of the lingual muscles (genioglossus and geniohyoid) in rats (Arch Oral Biol (2010; 55(10): 803-808)). However, in previous images, fat to muscle metamorphosis was not shown in humans. Here, we provide evidence of fatty metamorphosis in the lingual muscles using computed tomography (CT) images of patients with suspected OSA.Materials and methods: The subjects were 62 patients (47 male, 15 female) with suspected OSA, who visited Tsurumi University School of Dental Medicine from November 2007 to October 2011. All subjects gave informed consent to take part in the study. The subjects underwent CT evaluations at the image diagnosis department of the hospital. Sex, age, body mass index (BMI), and apnea hypopnea index (AHI) were recorded for each patient. Inferior airway space and the total value of length and width of the inferior airway space (TIAS) were also measured. The degree of fat to muscle metamorphosis was measured using CT. Aze Win image analysis software was used to set a region of interest (ROI) of 30mm2 on the belly muscle of the lingual muscles. We measured CT levels of four ROIs (both sides of the central area and both sides of the posterior area) in the genioglossus muscles and two sizes of ROI (both sides of the central area) in geniohyoid muscles. Values were quantified and compared statistically.Results: The median values (25% quartile deviation; 75% quartile deviation) of the patient's age, BMI (kg/m2), AHI, genioglossus CT level, geniohyoid muscle CT level, and TIAS were 51.50 years old (42.75, 62.25), 24.00 (22.00, 26.00), 24.35 (11.40, 36.10), 123.05 (90.95, 135.70), 111.20 (104.80, 116.30), and 34.65 (25.97, 40.62), respectively. The results of a multiple regression model were analyzed using Amos (Ver. 6) software where the standardized estimates of the BMI were -0.50 (p = 0.000) for the genioglossus muscle and -0.42 (p = 0.000) for the geniohyoid muscle. The standardized estimate of BMI of the distance of the TIAS was -0.55 (p = 0.001). The standardized estimate of AHI of the TIAS was -0.48 (p = 0.000).Conclusion: Consistent with the report of Saito et al., we showed evidence of fatty metamorphosis of lingual muscles of humans with effects of the TIAS and AHI.

著者

神田 重信

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.51, no.1, pp.1-4, 2011 (Released:2011-08-05)

参考文献数

3

被引用文献数

2

著者

岡田 成生 上野 泰宏 星 健太郎 伊藤 弘人 神部 芳則 草間 幹夫 小林 馨

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.48, no.1, pp.8-11, 2008

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We report a patient with jaw trismus demonstrating Square-Mandible face.<BR>Clinically, the patient had a square face with prominent masseter muscles and mandibular angles. The interincisal opening was 26mm, with limited lateral and anteroposterior mobility.<BR>The clinical diagnosis was restricted mouth opening due to bilateral hyperplasia of the masseter muscle aponeuorses. Masseter muscle myotomy with aponeurectomy was performed bilaterally by an intraoral approach. Mouth opening improved to 40mm after incision of the aponeuroses.<BR>An examination of the patient one year after surgery demonstrated an interincisal opening of 37mm without strain.

著者

誉田 栄一 倉林 亨 吉田 みどり

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.57, no.1, pp.1-9, 2017 (Released:2017-09-29)

参考文献数

16

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MRI is a method which locates NMR(nuclear magnetic resonance)signal and creates an image. The method of the positioning is different from that of CT imaging.Transmission and receive coils are used for handling electromagnetic wave in MRI. And 3-dimensionally independent three coils for application of gradient are equipped. One of the three coils is for slice selection of a patient, and the rest 2 coils are for locating signal on the 2-dimensional slice. This review explains the principle of image formation in MRI.

著者

清水 真弓 岡村 和俊 吉浦 一紀 神田 重信

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.44, no.1, pp.49-52, 2004-03-30 (Released:2011-09-05)

参考文献数

19

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シェーグレン症候群の超音波像では「内部エコーの不均一化」が重要である。そのうち, 「multiple hypoechoic areas」ならびに「hyperechoic lines or spots」を診断基準に採用すると高い正診率が得られ, さらに, 耳下腺に顎下腺の所見を加えると感度ならびに正診率の向上が認められた。これらの結果をふまえ, より広く受け入れられる診断基準の確立がのぞまれる。

著者

佐々木 武仁

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.37, no.1, pp.3-14, 1997-06-05 (Released:2011-09-05)

参考文献数

40

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Radiation carcinogenesis has been thought as a stochastic phenomenon without any threshold dose of radiation. Although this concept is very important, the presence or absence of a threshold dose in the dose-response relationship is difficult to directly confirm. This review discusses the implication of recent analysis of cancer mortality among atomic bomb survivors and multistep genomic changes involved in human carcinogenesis in relation to the radiation carcinogenesis at low doses. The remarkable similarity in the both shape and magnitude of the dose responses curve is seen between mutational cellular events and cancer incidence among atomic bomb survivors. In view of the increasing evidence for radiobiological mechanisms of radiation carcinogenesis including activation of oncogenes and inactivation of tumor suppressor genes and for analysis in the models of dose-response relationship, it seems likely that radiation is responsible for one mutational event in multistep genomic changes in carcinogenesis.

著者

西尾 正道

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.37, no.1, pp.15-22, 1997-06-05 (Released:2011-09-05)

参考文献数

9

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Of the 195 primary cases with squamous cell carcinoma of the tongue treated at National Sapporo Hospital between 1978 and 1990 were reviewed, 152 cases were treated with interstitial needle implant with or without external beam irradiation and 43 cases were treated by operation. The local control rate by needle implant for the primary tongue lesions was 88% and the cause-specific 5-year survival rate was 82%. QOL is a serious problem for the cancer patient, but the most important problem is the reasonable quality of treatment provided from the medical therapist. From this point of view, the interstitial implant for early cancer of mobile tongue is the best treatment in preservation of function and form, in the medical cost and treatment period. From the viewpoint of scientific sociology, we will be discussing the usefulness of radiotherapy and comparison of the structure of radiation oncology in Japan and the United States. Specialists must notify their fellow-physicians in related departments about the advantage of radiation therapy, and the well-balanced cancer therapy is expected to be useful.

著者

佐藤 太吾 代居 敬 五十嵐 史征 勝山 直彦 内田 稔 井上 健和

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.38, no.2, pp.122-123, 1998-06-30 (Released:2011-09-05)

被引用文献数

1

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.37, no.3, pp.273-273, 1997 (Released:2011-09-05)

著者

森田 光子 有地 淑子 木瀬 祥貴 後藤 真一 泉 雅浩 内藤 宗孝 勝又 明敏 有地 榮一郎

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.50, no.3, pp.27-38, 2010 (Released:2011-03-11)

参考文献数

20

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Objective: To clarify the educational effect of a lecture on differential imaging features comparing ameloblastomas and keratocystic odontogenic tumors of the mandibles presented to dental students.Methods: Panoramic and CT images of 10 ameloblastomas and 10 keratocystic odontogenic tumors were randomly presented 114 dental students. Test scores, correct answer ratios, identification index, and understanding of the imaging features contributing to a correct diagnosis were serially evaluated before and after the lecture on the differential imaging features comparing the two types of tumors.Results: The mean and standard deviation of the scoring ratios of dental students diagnosing these lesions on panoramic and CT images were 48.8 ± 10.8% and 52.5 ± 12.9%, respectively. After the lecture on the differential imaging features comparing the two tumors, the scoring ratios improved significantly. After the lecture, both the numbers of patients whose images were correctly diagnosed and the identification indices increased. The lecture also increased the number of imaging features recognized as contributing to the correct diagnosis.Conclusion: A lecture on the differential imaging features comparing ameloblastomas and keratocystic odontogenic tumors of the mandibles contributed to the improvement of imaging diagnosis skills among dental students.

著者

神田 重信

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.44, no.3, pp.135-135, 2004-09-30 (Released:2011-09-05)

著者

神田 重信

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.44, no.3, 2004-09-30

著者

誉田 栄一 黄 皓仁 土門 正治 中村 正

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.26, no.3, pp.254-256, 1986 (Released:2011-09-05)

参考文献数

11

著者

池島 厚 富山 文信 尾澤 光久 山本 浩嗣

出版者

特定非営利活動法人 日本歯科放射線学会

雑誌

歯科放射線 (ISSN:03899705)

巻号頁・発行日

vol.21, no.1, pp.47-48, 1981 (Released:2011-09-05)