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Volume 60 (2020)
- Issue 2 Pages 35-
- Issue 1 Pages 1-
Volume 60, Issue 1
Displaying 1-7 of 7 articles from this issue
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Norihito Iizuka, Hirotaka Muraoka, Naohisa Hirahara, Kotaro Ito, Satos ...2020 Volume 60 Issue 1 Pages 1-4
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSBackground and Purpose: Odontogenic maxillary sinusitis primarily results from bacterial proliferation secondary to a dental infection. Since the maxillary premolar and molar roots are located closest to the maxillary sinus floor, periodontitis in these teeth is the most common cause of odontogenic maxillary sinusitis. The purpose of this study was to evaluate the association between the distance from the maxillary sinus floor to the maxillary ostium and mucosal thickening in the maxillary sinus using computed tomography （CT）.
Materials and Methods: The study group comprised 84 patients （32 males, 52 females; age: 20-92 years, mean age: 52.5 years） with a total of 131 maxillary sinuses that were examined by multidetector CT. The CT images of 37 maxillary sinuses were excluded due to the presence of maxillary tumors or apical periodontitis, or incomplete imaging. The anatomical relationship between the teeth and maxillary sinus was classified into four groups based on the distance between the maxillary ostium and maxillary sinus floor. The CT images were also examined for mucosal thickening （>2mm） of the maxillary sinus floor. Between-group differences in distances and states were analyzed using statistical software （SPSS version 21.0Ⓡ; IBM Japan Inc., Tokyo, Japan）. P<0.01 was considered to indicate significance.
Results: The distance between the maxillary ostium and maxillary sinus floor was significantly associated with mucosal thickening in the maxillary sinus （P<0.01）.
Conclusion: Increases in the distance between the maxillary ostium and maxillary sinus floor can result in greater mucosal thickening in the maxillary sinus. These results suggest that the distance between the maxillary ostium and maxillary sinus floor could be a useful parameter for assessing the risk of maxillary sinusitis.View full abstractDownload PDF (733K) -
Kotaro Ito, Hirotaka Muraoka, Naohisa Hirahara, Satoshi Tokunaga, Eri ...2020 Volume 60 Issue 1 Pages 5-11
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSPurposes: This study aimed to quantitatively evaluate the nasopalatine duct （NPD） and nasopalatine duct cysts （NPDC） using CT texture analysis.
Materials and Methods: This IRB-approved retrospective study included 31 NPDC patients （21 males, 10 females; mean age: 44.2, range: 22-83） and 31 age- and sex-matched patients with normal NPD （21 males, 10 females; mean age: 44.2, range: 22-83） who underwent head and neck CT. The NPDC patients were identified via histopathological examinations of surgical specimens. Patients with maxillary tumors or cysts （excluding NPDC）, severe metal artifacts that prevented visualization of the NPD, or that were aged<20 years old were excluded. The radiomic features of NPDC and normal NPD were analyzed using the open-access software MaZda Ver.3.3 （Technical University of Lodz, Institute of Electronics, Poland）. Two hundred and ninety-four radiomic features were evaluated in each ROI. Then, 10 textural features were selected using the MaZda feature selection tools, which are based on Fisher’s coefficient. The results were compared with the Mann-Whitney U test.
Results: One histogram feature （the 90th percentile）; 6 GLCM features （S （0, 3） InvDfMom, S （3, −3） InvDfMom, S （0, 4） InvDfMom, S （4, −4） InvDfMom, S （0, 5） InvDfMom, and S （5, −5） InvDfMom）; and 3 GLRLM features （45° fraction, vertical fraction, 135° fraction） differed significantly between NPDC and normal NPD （P<0.05）.
Conclusion: CT texture analysis was able to quantitatively evaluate normal NPD and NPDC. Our results suggest that CT texture analysis might be useful for differentiating NPDC from normal NPD.View full abstractDownload PDF (1046K) -
Eri Sawada, Kotaro Ito, Hirotaka Muraoka, Satoshi Tokunaga, Norihito I ...2020 Volume 60 Issue 1 Pages 12-16
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSPurpose: The purpose of this study was to quantitatively assess masticatory muscle myalgia in the elderly using apparent diffusion coefficients （ADC） derived from diffusion-weighted imaging （DWI）.
Patients and methods: Twenty-three patients with temporomandibular disorders （TMD） that were≥65 years old （7 males, 16 females; mean age: 71.7 years, range: 65-80 years） and 65 TMD patients that were <65 years old （11 males, 54 females; mean age: 41.8 years, range: 16-64 years） who underwent MRI from February 2017 to March 2019 were included. The MRI techniques used included axial DWI and short tau inversion recovery imaging through the neck to the skull base. On an ADC map, regions-of-interest that included the entire right or left lateral pterygoid muscle, medial pterygoid muscle, or masseter muscle were drawn on the slices on which the area of the target muscle was largest. The results were analyzed using Mann-Whitney’s U test and Pearson’s correlation coefficient.
Results: Among the elderly patients, the mean ADC values of the masticatory muscles on the pain side were higher than those on the without pain side （P<0.05） （lateral pterygoid muscles: 1.36±0.19×10−3mm2/s vs. 1.18±0.16×10−3mm2/s; medial pterygoid muscles: 1.21±0.13×10−3mm2/s vs. 1.07±0.07×10−3mm2/s; masseter muscles: 1.28±0.15×10−3mm2/s vs. 1.16±0.11×10−3mm2/s, respectively）.
Conclusion: This study revealed that the masticatory muscles are not significantly affected by aging. The ADC values of the masticatory muscles might be useful for quantitatively evaluating masticatory muscle myalgia in elderly people.View full abstractDownload PDF (440K) -
Takaharu Kudoh, Akira Takahashi, Keiko Kudoh, Youji Miyamoto2020 Volume 60 Issue 1 Pages 17-20
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSThis study aimed to estimate the prevalence and determine the risk factors for the development of osteoradionecrosis （ORN） of the jaw after intensity-modulated radiation therapy （IMRT）. The cases of 114 patients who achieved complete remission after undergoing IMRT for head and neck cancer between 2011 and 2017 were retrospectively reviewed. The treatment involved IMRT with simultaneous integrated boost. The maximum dose delivered to the mandible and the mean dose delivered to the maxillae were kept below 70Gy and 35Gy, respectively. Age, sex, disease stage, the intent of radiation therapy, the maximum dose delivered to the jaw, whether the patient was dentulous or edentulous, the presence/absence of chemotherapy, diabetes mellitus, and smoking history were evaluated as risk factors for ORN. ORN was observed in 3 maxillae and 4 mandibles, and a total of 7 （6.1%） patients developed ORN during a median follow-up period of 15 months （6-28 months）. The maximum dose delivered to the jaw （70Gy） was significantly related to the development of ORN of the jaw. No other significant factors were identified. As ORN was observed in 3maxillae, we should consider dose constraints for both the mandible and maxillae to prevent ORN of the jaw.View full abstractDownload PDF (212K)
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Nao Wakasugi-Sato, Masafumi Oda, Shinobu Matsumoto-Takeda, Tatsuro Tan ...2020 Volume 60 Issue 1 Pages 21-23
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSDownload PDF (263K) -
Takashi Nishioka, Takenori Ogawa, Takaki Murata, Ikuho Kojima, Yusuke ...2020 Volume 60 Issue 1 Pages 24-26
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSDownload PDF (562K) -
Sakurako Asai, Junichiro Sakamoto, Ami Kuribayashi, Shinya Kotaki, Toh ...2020 Volume 60 Issue 1 Pages 27-30
Published: 2020
Released on J-STAGE: October 04, 2020
JOURNAL FREE ACCESSDownload PDF (533K)
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