Yoshiko Ariji

Aichi Gakuin University, Nagoya, Aichi, Japan

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Publications (79)58.77 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Evaluating alterations in brain activity in response to pain stimulus can help understand the mechanisms underlying pain perception. We measured oxygenated hemoglobin (oxy-Hb) levels using functional near-infrared spectroscopy (fNIRS) in order to assess prefrontal cortex activation after inducing a pain stimulus to the gingiva. Twenty-three right-handed, healthy male subjects (mean age: 29.3±3.6 years) were subjected to a mild pain stimulus to the tissue around the right maxillary central incisor. The periodontal pain stimulus (PPS) was elicited from a pocket probe, and a multi-channel fNIRS system with its accompanying 22-channel probes was used for measuring oxy-Hb levels. Mean oxy-Hb levels for each channel were calculated on the basis of values obtained at rest and during the PPS load, for 1minute each. The change in oxy-Hb level was calculated by subtracting oxy-Hb at rest from oxy-Hb levels during PPS load. Oxy-Hb levels in each channel during both conditions were then compared using the paired t-test and Bonferroni correction. Pain stimulation caused oxy-Hb levels to decrease in virtually all areas of the prefrontal cortex, particularly, in the superior frontal gyrus, the middle frontal gyrus, and the orbital part of the superior, middle, and inferior frontal gyrus, on the brain side contralateral to the pain load. This measurement could prove beneficial as an index for objective pain evaluation.
    Neuroscience letters. 05/2014;
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    ABSTRACT: The study aimed to clarify the masseter muscle hardness in patients with myofascial pain, to examine their changes after massage, and to analyze whether the hardness can be an index for massage treatment. Sixteen patients with myofascial pain (12 with unilateral and 4 with bilateral masseter muscle pain) and 24 healthy volunteers were enrolled in this study. The masseter hardness between patients and the healthy volunteers was compared. The changes in the hardness in patients after massage were examined. The relation of the hardness with massage regimens and efficacies was analyzed. There was a significant right-and-left difference of the hardness in patients, although there was no difference in the healthy volunteers. The hardness decreased after massage. The pretreatment asymmetry index of the hardness showed a significant correlation with the massage pressure. It was concluded that there was a significant difference between the right and left masseter hardness in patients with myofascial pain. After massage treatment, the masseter hardness and right-and-left difference decreased. The hardness may be an index for determining the massage pressure.
    Cranio: the journal of craniomandibular practice 10/2013; 31(4):291-9. · 1.11 Impact Factor
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    ABSTRACT: To investigate the intramuscular changes on sonographic elastography (SE) after low-level static contraction of the masseter muscle, and to clarify the relationship with the total hardness and edematous change. Ten healthy volunteers performed sustained bilateral biting at 20% of maximal voluntary contraction for 10 min. The SE and magnetic resonance (MR) scans of the masseter muscles were performed before, immediately after, and 10 min after exercise. The masseter muscle elasticity index (MEI) ratio, muscle thickness, and intramuscular soft and hard areas distribution were evaluated on SE images. The signal to noise ratio (SNR), indicating the water content, was measured on MR images. The soft area ratio showed significant correlations with the water content expressed as SNR. The hard area ratio showed significant correlations with the total muscle hardness expressed as the MEI ratio. Intramuscular soft and hard areas could be used both clinically and experimentally.
    Oral surgery, oral medicine, oral pathology and oral radiology. 09/2013; 116(3):354-61.
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    ABSTRACT: Objective: Angiogenesis and lymphangiogenesis are related to tumor proliferation in patients with tongue cancer. It has been insufficiently not analyzed whether intraoral color Doppler sonography is effective for their evaluation. In this study, we have clarified the sonographic features of the tongue as possible predictive factors of cervical lymph node metastasis. Method: Thirty-three patients (26 men and 7 women, 32-87 years old, average of 58.7) with T1-2 squamous cell carcinoma of the tongue were enrolled.All patients underwent intraoral color Doppler sonography and surgical excision of the tumors. Patients who underwent preoperative chemotherapy and radiotherapy were excluded. Lymph node metastasis was diagnosed pathologically after neck dissection: pN0, 1 patient; pN1, 2; pN2b, 9; pN2c, 1. Twenty patients showed no lymph node metastasis at 1 year and 6 months or more after the operation, and they were diagnosed with cN0. Clinical information on the age, gender, tumor size, and clinical types was recorded. On the sonographic images, the tumor depth, tumor thickness, shape of the invading front of the tumor, color feature and vascular index (VI) of the tumor area, and asymmetry of VI of the deep lingual artery were evaluated. Result: Between the 2 groups of tongue cancer patients with and without cervical lymph node metastasis, there were significant differences in maximum and minimum tumor size, clinical types, tumor depth, tumor thickness, shape of the invading front of the tumor, VI of the tumor area, and asymmetry of VI of the deep lingual artery. As a result of multiple linear regression analysis, possible predictive factors of cervical lymph node metastasis were clinical types (endophytic), shape of the invading front of the tumor (invasive) and VI of the tumor area. Conclusion: Intraoral color Doppler sonography provides one of possible predictive factors of cervical lymph node metastasis, and is recommended.
    IADR Asia/Pacific Region (APR) Regional Meeting and Co-Annual Scientific Meeting of IADR Divisions 2013; 08/2013
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    ABSTRACT: Objective: Near-infrared spectroscopy (NIRS) is a method for measuring brain function by assessing changes in blood hemoglobin concentrations, which are dependent on neural activity. An advantage of NIRS is that it can be used during a variety of postures and actions, and in tasks that cannot be investigated using functional magnetic resonance imaging and magnetoencephalography. Previously, when performing NIRS measurements of cerebral blood flow during oral functional movements represented by chewing and clenching, we observed that the waveform of NIRS signals often synchronized with a motion of the head tilt. In the present study, we examined the influence of the lateral tilt of the head on multichannel NIRS measurements. Method: The subjects were 10 healthy volunteers (6 males and 4 females, 29.0±1.5 yrs). Multichannel NIRS (Hitachi Medical Corporation; ETG-4000) was used to measure cerebral blood flow, with a measurement probe (3×11; 52 channel) placed in the frontal and temporal lobe regions. Following a three-minute rest with the head in an upright position, the subject’s head was tilted left side 10 degrees and 20 degrees, and cerebral blood flow was measured. There was 30s rest between each task. Paired t-tests were used to identify significant differences in cerebral blood flow associated with the tilt of the head (significance level of p < 0.05 was used for each channel). Result: Compared with rest in the upright position, the cerebral blood flow of 5 channels increased by tilting the head left side 10 degrees. Cerebral blood flow increased for 18 channels by tilting the head left side 20 degrees. Conclusion: For healthy volunteers, NIRS signals have been shown to increase by increasing the lateral tilt of the head. Therefore, when measuring cerebral blood flow using NIRS, it is important to note any head tilt.
    IADR Asia/Pacific Region (APR) Regional Meeting and Co-Annual Scientific Meeting of IADR Divisions 2013; 08/2013
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    ABSTRACT: Objective: Panoramic radiography has a potential role in detecting carotid arterial calcifications (CACs) which may be related to arteriosclerosis in elderly people. In this regard, we developed a computer-assisted detection/diagnosis (CAD) system. The aim of this study was to clarify the diagnostic accuracy of the CAD system for detecting CACs in comparison with CT. Method: A total of 216 sides of the neck area were screened with the CAD system on panoramic radiographs in 108 adults (45 men, 63 women, average age: 60.3 years) who were also examined with CT. The scans involved serial images between the levels of the occlusal plane and hyoid bone. The diagnostic accuracy of the CAD system was calculated comparing with the CT appearance as the gold standards. The false positive and false negative cases were investigated in more detail regarding the size, number, and location of CACs on CT images. Result: The sensitivity, specificity, and accuracy of the CAD system were 0.74, 0.69, and 0.71, respectively. Thirty-eight sides appeared to be false positive while 24 sides were false negative. In the false positive sides, the peripheral portions of the hyoid and cervical spine were erroneously detected in 15 and 18 sides, respectively. In one side, both the hyoid and spine were detected. In the remaining side, the causal structures could not be identified. Although 17 calcifications of 24 false negative sides could be detected with the binarization process, which is one detection algorithm, the CAD system finally identified them as normal anatomic structures, such as the hyoid and cervical spine. Conclusion: Although the sensitivity should be improved for screening with improvement of the detection algorithm regarding accurate detection of the hyoid and cervical spine, the system showed potential for detecting CACs.
    IADR Asia/Pacific Region (APR) Regional Meeting and Co-Annual Scientific Meeting of IADR Divisions 2013; 08/2013
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    ABSTRACT: Objective: : Morphological analysis of the parotid duct, which is called as Stensen’s duct, was seldom done due to difficulties of depiction and accurate measurement even using the advanced imaging techniques, such as MR sialography. This study aimed to analyze morphological changes of Stensen’s duct related to age and diseases on axial images of a multi-detector computed tomography (MDCT). Method: MDCT was performed according to our previously described method (Miyake T, 2012). The ductal angle and width on CT images were measured and compared in 185 patients (88 men and 97 women) who were divided into three age groups: 5-19, 20-39, and 60-85 years old. These patients were selected from a group who had been examined by MDCT during the past two years. Patients with trauma, cleft palate, jaw deformity, tumor, or inflammation involving the buccal space and/or parotid gland were excluded. In addition, unaffected sides of Stensen’s ducts of 15 patients with oral cancer and 26 patients with obstructive parotitis were analyzed and compared to the age and gender matched patients without the diseases. Result: Stensen’s ducts in elderly group (60-85 years old) showed significantly more curvy and narrow morphology (both p < 0.001; Kraskal-Wallis test) as compared to the youngest group. No gender differences were detected in each age group. The correlation coefficients between the left and right ducts were 0.61 in angle and 0.63 in width (both p< 0.001). The unaffected side of the patients with oral cancer exhibited significantly wider ducts as seen in chronic ductitis, whereas that of the patients with obstructive parotitis showed significantly curvy ducts (p < 0.01 respectively; Mann-Whitney U-test). Conclusion: These results suggest that Stensen’s duct morphology is altered with age, and is related to oral cancer and obstructive parotitis. Clinical significance of these changes warrant to further investigation.
    IADR/AADR/CADR General Session and Exhibition 2013; 03/2013
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    ABSTRACT: PurposeThe purpose of this study was to investigate computed tomography (CT) and clinical features relating to calcifications within the parotid gland of patients with Sjögren's syndrome (SS).Methods Data from 30 patients with SS who had been examined by CT were extracted from our radiological information database accumulated from 2001 to 2011, and their CT images were reread carefully. Of these patients, 14 (all female; age range 20–95 years; mean age 61.4 years) with calcifications within the parotid gland were retrospectively investigated with CT findings. The relationship between calcification occurrence and clinical symptoms including parotid swelling and/or saliva colic was investigated. The degree of destruction of the parotid gland on CT images was also evaluated.ResultsAll calcifications of 14 patients were located within the parotid gland, not in the parotid duct. CT images of all calcifications showed small and regular round shapes. Multiple occurrences of calcifications were recognized in 10 patients, and a solitary occurrence was seen in 4 patients. Seven patients had bilateral calcifications. There was little relationship between the occurrence of calcifications and clinical symptoms, and the severity of destruction of the parotid gland.Conclusion The presented CT and clinical features would be peculiar to SS because too many patients lacked the typical features of sialoliths within the parotid gland.
    International Journal of Oral Science 01/2013; 10(1):28–32. · 2.72 Impact Factor
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    ABSTRACT: Objective: To examine the masseter stiffness, the masseter thickness and the maximum occlusal force in patients with myofascial pain, and to analyze their changes after massage treatment. Materials and Methods: Sixteen patients with temporomandibular joint dysfunction with myofascial pain were enrolled in this study. Their age ranged from 26 to 69 years, and the median age was 41 years. They were informed of the aim of the study, and provided their consents before participating. Four male and 8 female patients had the unilateral masseter pain, and the 4 female patients had suffered the bilateral masseter pain. The stiffness of the bilateral masseter muscles were measured using NEUTON TDM-N1. The thickness of the bilateral masseter muscles were measured on sonographic images with LOGIQ E9. Elastograhic images were taken together. The maximum occlusal force was measured on the bilateral first molars using Occlusal Force Meter GM10. All patients undertook the massage treatment using a specially fabricated robot (WAO-1). After massage treatment, the masseter stiffness, the masseter thickness and the maximum occlusal force were measured. Results: In patients with the unilateral masseter pain, the masseter stiffness of the symptomatic side was larger than those of the contralateral side (p<0.05). In patients with the bilateral pain, there was a significant right-and-left difference (p<0.05). There were no significant right-and-left difference in the masseter thickness and the maximum occlusal force. After massage treatment, VAS score of pain decreased. The masseter stiffness and thickness significantly decreased and the maximum occlusion force significantly increased (p<0.01). Sonographic elastographic images before and after the treatment were presented. Conclusion: The masseter stiffness in patients with myofascial pain had a significant laterality, and it significantly decreased after the massage treatment. Therefore, the masseter stiffness may have the possibility of an index for evaluating therapeutic gain.
    45th Meeting of the Continental European Division of the International Association of Dental Research (CED-IADR) with the Scandinavian Division (NOF) 2011; 09/2011
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    ABSTRACT: Objective: Near-infrared spectroscopy (NIRS) is a method for measuring brain function by assessing changes in blood hemoglobin concentrations, which are dependent on neural activity. An advantage of NIRS is that it can be used during a variety of postures and actions, and in tasks that cannot be investigated using functional magnetic resonance imaging and Magnetoencephalography. We have previously performed NIRS measurements of cerebral blood flow during exercise in oral functional movements represented by chewing. At that time, the waveform of NIRS signals synchronized with a motion of the head was often observed. In the present study, the influence of the lateral tilt of the head on NIRS measurements was examined. Methods: The subjects were 10 healthy volunteers (6 males, 29.01.5 yrs). Multichannel NIRS (Hitachi Medical Corporation; ETG-4000) was used to measure cerebral blood flow, with a measurement probe (311; 52 channel) placed in frontal and temporal lobe regions. Cerebral blood flow was measured while the head tilted left side 10 degrees, 20 degrees and 30 degrees, respectively, after a three-minute rest (rest: upright position). There was 30 s rest between each task. Paired t-tests were used to identify significant differences in cerebral blood flow associated with the tilt of the head (significance level of p < 0.05 was used for each channel). Results: Compared with rest in the upright position, the cerebral blood flow of 5 channels increased by tilting the head left side 10 degrees. Cerebral blood flow increased for 18 channels by tilting the head left side 20 degrees, and for 20 channels when the head was tilted left side by 30 degrees. Conclusion: For healthy volunteers, NIRS signals have been shown to increase with increasing lateral tilt of the head. Therefore, when measuring cerebral blood flow using NIRS, it is necessary to note the head tilt.
    45th Meeting of the Continental European Division of the International Association of Dental Research (CED-IADR) with the Scandinavian Division (NOF) 2011; 09/2011
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    ABSTRACT: Objective: Near-infrared spectroscopy (NIRS) is a non-invasive method to measure brain activity. NIRS detects concentration changes in blood oxy- and deoxy-hemoglobin associated with neural activity. NIRS is safe, portable and very affordable neuroimaging system relative to other technologies such as fMRI, PET and MEG. Furthermore, NIRS has no restriction of subject position and location, thus allowing naturalistic experiments. The purpose of this study was to assess the activation patterns of the cerebral cortex on voluntary swallowing using NIRS. Methods: Seven healthy right-handed subjects (age 26.61.1 yrs) were studied. All subjects gave written informed consent before this study. For the NIRS measurement, a 52-channel NIRS system (Hitachi ETG-4000) was used. Subjects were seated with 311 probes mounted on the head. Command swallow was performed by injecting 5-ml water into the oral cavity as a task. Ten tasks (10s) alternating with 10 rest (60s) trials were carried out for one subject and changes in oxy-hemoglobin(Oxy-Hb) measured. For each 52 channel, the average data from 10 trials of the task was obtained and the peak Oxy-Hb value in 10 s periods, which is 15 s after starting of the task, was assessed. Analysis of differences in peak value of Oxy-Hb by front-behind and right-left side on head was assessed using two-way analysis of variance and Tukey's honestly significant difference test. Results: Swallowing activity was associated with increases in oxy-Hb levels in the right and left temporal region. There was a significant difference between temporal region and other regions (p<0.01). Conclusion: The brain region activated by swallowing was corresponding to areas in super temporal gyrus, inferior frontal gyrus, middle temporal gyrus, and temporal pole. NIRS may be a suitable method of evaluating the brain activation patterns on swallowing.
    45th Meeting of the Continental European Division of the International Association of Dental Research (CED-IADR) with the Scandinavian Division (NOF) 2011; 09/2011
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    ABSTRACT: The aim of this study was to clarify the characteristic imaging features that can be used to differentiate ameloblastomas from keratocystic odontogenic tumours and to examine the significant imaging features contributing to a correct diagnosis. 60 observers (39 specialists in oral and maxillofacial radiology and 21 non-specialists) examined CT and/or panoramic images of 10 ameloblastomas and 10 keratocystic odontogenic tumours shown on a webpage and made diagnoses. Their correct answer ratios were then calculated. The imaging features of the tumours were evaluated and expressed as binary numbers or quantitative values. The imaging features that contributed to a correct diagnosis were elucidated using logistic regression analysis. The mean correct answer ratio was 61.3% ± 17.2% for the diagnosis of ameloblastomas and keratocystic odontogenic tumours. CT images produced higher correct answer ratios for diagnosis of keratocystic odontogenic tumours by specialists. The significantly different imaging features between ameloblastomas and keratocystic odontogenic tumours were the degree of bone expansion and the presence of high-density areas. The significant imaging features contributing to a correct imaging diagnosis were the number of locules, the presence of high-density areas and the inclusion of impacted teeth. The presence of high-density areas is the most useful feature in the differential diagnosis of ameloblastomas and keratocystic odontogenic tumours based on comparison of the imaging features of both tumours and examination of the diagnostic contributions of these features.
    Dentomaxillofacial Radiology 03/2011; 40(3):133-40. · 1.27 Impact Factor
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    ABSTRACT: The aim of this study was to clarify the sonographic features of the masseter muscle as indices for judging the efficacy of massage treatment. Fifteen patients with temporomandibular disorder (10 with unilateral and 5 with bilateral muscle pain) underwent massage treatment alternately on the bilateral masseter and temporal muscles with an oral rehabilitation robot. Sonography was performed before and after treatment, and the masseter thickness and existence of anechoic areas were evaluated. The thickness on the symptomatic side in the unilateral group significantly decreased after treatment. Anechoic areas were shown in 20 muscles (66.7%) before treatment, and disappeared or were reduced in size in 17 muscles (85.0%) after treatment. The pretreatment thickness was significantly related to visual analog scale (VAS) scores regarding posttreatment muscle pain and massage impression. The existence of anechoic areas was relevant to VAS scores regarding muscle pain. Masseter thickness and existence of anechoic areas might be related to the therapeutic efficacy regarding muscle pain.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 10/2010; 110(4):517-26. · 1.50 Impact Factor
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    ABSTRACT: The purpose of this study was to investigate factors associated with lymph node (LN) metastasis to identify which nasopharyngeal cancer (NPC) patients can undergo a reduction in the prophylactic radiation field. MRI of biopsy-proven NPC patients was evaluated to determine primary tumour extension and the existence of LN metastasis. Sex, age, pathological type, T stage, primary tumour size, existence beyond the midline of the nasopharynx at the primary site and parapharyngeal extension of the primary tumour were assessed regarding their impact on the laterality of LN metastasis using the χ(2) test. Of the 167 patients, 149 (89%) showed nodal involvement. The existence beyond the midline of the nasopharynx was significantly associated with the laterality of LN metastasis (p<0.0001). Most patients (82%) with primary tumour presence within the midline showed only ipsilateral LN metastasis or no LN metastasis. In addition, contralateral LN metastases were seen only at Level II and the retropharyngeal LN among most of other patients. These results suggest that LN areas other than Level II and the retropharyngeal LN on the contralateral side could be omitted in patients with primary tumour presence within the midline and without the contralateral Level II or the retropharyngeal LN. Whether disease control is compromised by reducing the radiation field for subclinical diseases is a problem that should be solved in the future by prospective study.
    The British journal of radiology 10/2010; 84(999):265-70. · 2.11 Impact Factor
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    ABSTRACT: Objectives: Increase of the cerebral blood flow during exercise condition of gum chewing efficiently contributes to improvement of the working memory. Furthermore, it is preferable that exercise doesn't cause the masseter muscles fatigue. In the present study, as a basic examination, the cerebral and the masseter muscle blood flow during gum chewing was measured using near infrared spectroscopy (NIRS), and the time-dependent change was investigated. Methods: Seven right-handed, healthy volunteers (mean age 32.13.6 years) were asked to chew gum (Tasteless gum base; Lotte, Tokyo, Japan) of 2Hz for one minute, and the bilateral cerebral and masseter muscle hemoglobin index (HbI) as the blood flow were measured with two dual channel NIRS system (TOS-96; Tostec, Tokyo, Japan) simultaneously. HbI at rest was set down 1.00. HbI during gum chewing and after chewing gum for one, two, three, four and five minutes were measured respectively. The statistical analysis of time-dependent change was tested using the Friedman test (significance level; p < 0.05). Results: HbI of the left cerebrum increased one minute after chewing (1.040.02), and decreased five minutes after chewing (1.000.01). HbI of the right cerebrum increased one minute after chewing (1.030.01), and decreased five minutes after chewing (1.000.01). HbI of the left masseter muscle increased during chewing (1.060.02), and decreased two minutes after chewing (0.990.02). HbI of the right masseter muscle increased during chewing (1.030.02), and decreased two minutes after chewing (0.980.02). These results showed significant difference (p < 0.05). Conclusion: The HbI of the bilateral cerebrum and masseter muscle increased, and afterwards decreased gradually after gum chewing movement. In addition, it was shown that the HbI of the cerebrum held an increase for a long time compared with that of the masseter muscle.
    IADR General Session 2010; 07/2010
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    ABSTRACT: The aim of this study was to clarify the changes, using magnetic resonance (MR) images, in the masseter muscles caused by low-level static contraction. Ten healthy male volunteers were enrolled in the study. The MR scans were performed before, immediately after, and 10 minutes after low-level static contraction. Two imaging sequences were acquired: a diffusion-weighted image and an iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) image. The apparent diffusion coefficient (ADC), the signal-to-noise ratio (SNR), and the thicknesses of the right and left masseter muscles were examined. The ADC and SNR immediately after exercise were significantly higher than those before exercise and 10 minutes after exercise. The muscles were significantly thicker immediately after exercise than before exercise and 10 minutes after exercise. We confirmed the presence of edema in the masseter muscles caused by low-level static contraction using MR images.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 03/2010; 109(6):908-16. · 1.50 Impact Factor
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    ABSTRACT: ObjectivesTo demonstrate the imaging characteristics of a patient with myoepithelial carcinoma (MEC) of the mandible accompanied by submandibular lymph node metastases, and to discuss the differential image-based diagnoses. Patients and resultsThe patient was a 57-year-old woman who had suffered from a dull pain in her left lower molar region for 3months and had an elastic-soft mass in her submandibular region for 2months. Computed tomography (CT) images showed permeative destruction of the bone trabecula and intermittent absorption of the cortical plates in the left mandible. The bone marrow of this area showed low signal intensity in a T1-weighted magnetic resonance (MR) image, slightly low signal intensity in a T2-weighted image, and marked contrast enhancement. A tumor was confirmed outside the buccal and lingual cortical plates. The left submandibular mass was shown as a well-defined, water-density mass by CT, low signal intensity in the T1-weighted MR image, and markedly high signal intensity in the T2-weighted image. The histopathological diagnosis was MEC of the mandible with submandibular lymph node metastasis. ConclusionsWe demonstrated the imaging characteristics of MEC, showing permeative destruction of the bone trabecula, intermittent absorption of the mandible, and cystic degeneration of the metastatic cervical lymph node. KeywordsMyoepithelial carcinoma-Jaw-Lymph node metastasis-MRI
    Oral Radiology 01/2010; 26(1):29-35. · 0.17 Impact Factor
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    ABSTRACT: To examine the stiffness of the masseter muscle using sonographic elastography and to investigate its relationship with the most comfortable massage pressure in the healthy volunteers. In 16 healthy volunteers (10 men and 6 women), the Masseter Stiffness Index (MSI) was measured using EUB-7000 real-time tissue elastography. They underwent massages at three kinds of pressures using the Oral Rehabilitation Robot (WAO-1). A subjective evaluation regarding the comfort of each massage was recorded on the visual analogue scale. Elastography was also performed in two patients with temporomandibular joint dysfunction with the myofascial pain. The mean MSI of the right and left muscles in the healthy volunteers were 0.85 +/- 0.44 and 0.74 +/- 0.35 respectively. There was no significant difference between the right and left MSI in the healthy volunteers. The MSI was related to massage pressure at which the healthy men felt most comfortable. The two temporomandibular disorder patients had a large laterality in the MSI. The MSI was related to the most comfortable massage pressure in the healthy men. The MSI can be one index for determining the massage pressure.
    Journal of Oral Rehabilitation 08/2009; 36(9):627-35. · 2.34 Impact Factor
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    ABSTRACT: (18)F-fluorodeoxyglucose-positron emission tomography (FDG-PET) is an effective tool for evaluating the results of radiotherapy. However, some false-positive appearances caused by physiological or pathological accumulation are reported. We report on three patients who showed a high accumulation of FDG in the lingual muscles but had no recurrent tumour after definitive radiotherapy for the mobile tongue. All patients had squamous cell carcinoma of the tongue and received interstitial radiotherapy with small sources. High uptake was seen in the lingual muscles without recurrence or inflammation, based on physical and MR examinations. This false-positive appearance is thought to relate to ill-balanced high activity of the lingual muscles after definitive radiotherapy.
    The British journal of radiology 02/2009; 82(973):e3-7. · 2.11 Impact Factor
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    ABSTRACT: The aims of this study were (1) to assess the diagnostic power of magnetic resonance imaging (MRI) for mandibular osteomyelitis through comparison with conventional techniques and (2) to establish practical MRI diagnostic criteria in relation to treatment and clinical outcome. In 55 subjects, clinically suspected as mandibular osteomyelitis, signal intensities (SI) were evaluated on T1-weighted/short T1 inversion recovery (STIR) images. Forty-seven subjects were definitively diagnosed as having osteomyelitis by pathology studies or clinical course. For the acute or subacute stage, positively associated appearances were low SI on T1-weighted image and extensive high or focal high SI on the STIR image. For chronic stage, appearances of low SI on both T1-weighted and STIR images should be added to those for the acute or subacute stage. These findings support the at-present accepted imaging diagnostic criteria based on bony changes for detection of osteomyelitis. This study confirms that T1-weighted/STIR images are useful for the detection of mandibular osteomyelitis.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 05/2008; 105(4):503-11. · 1.50 Impact Factor

Publication Stats

666 Citations
58.77 Total Impact Points

Institutions

  • 1998–2014
    • Aichi Gakuin University
      • • Department of Dentistry
      • • Department of Oral and Maxillofacial Radiology
      • • Department of Oral and Maxillofacial Surgery
      • • Department of Orthodontics
      Nagoya, Aichi, Japan
  • 2001–2009
    • Aichi Cancer Center
      Ōsaka, Ōsaka, Japan
  • 2004–2007
    • Asahi University
      Gihu, Gifu, Japan
  • 2003
    • Osaka Dental University
      Ōsaka, Ōsaka, Japan
  • 2002
    • Peking University
      • School of Stomatology
      Beijing, Beijing Shi, China
  • 1995–1997
    • Kyushu University
      • Faculty of Dental Science
      Fukuoka-shi, Fukuoka-ken, Japan