- 著者
- Namrath Chatchaiyan Kaoru Koide Makoto Tsuchimochi Hajime Tanji Eiichiro Asano Hironobu Ishii Toshihide Sato Mami Ishii Atsuko Kondo Keishi Ohta
- 出版者
- Japan Prosthodontic Society
- 雑誌
- Prosthodontic Research & Practice (ISSN:13477021)
- 巻号頁・発行日
- vol.7, no.2, pp.222-224, 2008 (Released:2008-11-05)
- 参考文献数
- 5
The purpose of this study was to achieve optimal contrast of imaging characteristics in 4 dimensional MR images of the temporomandibular joint (TMJ) for evaluating the TMJ structures during mandibular movement. Twelve TMJs from six subjects without any TMJ dysfunction were studied. MRI was performed using a 1.5 MR system with an eight-channel phased array coil. The images were acquired using a balanced steady-state free precession (b-SSFP) sequence. The optimal flip angle was determined for differentiation for the main anatomical structures of the TMJ; the posterior band of the articular disc, the retrodiscal tissues, the condylar head, and the lateral pterygoid muscle, by examining the signal intensity (SI-d) of TMJ structures on b-SSFP MR images obtained using various flip angles. Repeated measures two-way analysis of variance (ANOVA) was performed, followed by Bonferroni's multiple comparison analysis. The main anatomical structures of the TMJ had the highest SI-d at flip angles of 30 degrees and 40 degrees, and there were the most significant differences between the SI-d of the articular disc and all other structures at a flip angle of 40 degrees, followed by a flip angle of 30 degrees. These data suggest that a flip angle of approximately 30 degrees to 40 degrees is appropriate for obtaining the optimal contrast of imaging characteristics for 4 Dimensional MR images of the TMJ with b-SSFP sequence.
- 著者
- Hisashi Koshino Toshihiro Hirai Yoshifumi Toyoshita Yuichi Yokoyama Maki Tanaka Kazuo Iwasaki Toshio Hosoi
- 出版者
- Japan Prosthodontic Society
- 雑誌
- Prosthodontic Research & Practice (ISSN:13477021)
- 巻号頁・発行日
- vol.7, no.1, pp.12-18, 2008 (Released:2008-02-22)
- 参考文献数
- 17
- 被引用文献数
- 19 40
Purpose: The purpose of this study was to reduce the number of food items for ease of use, and to eliminate the influence of food preferences (likes and/or dislikes) on an earlier version of the food intake questionnaire method for evaluating the ability of mastication in complete denture wearers which had been previously developed by the authors.Methods: The subjects were 262 complete denture wearers (average age: 76.7±6.1 years old, male: 128 persons, female: 134 persons). The food intake questionnaire composed of a list of 35 food items which were used in the study. All subjects were asked to assign a mark to each type of food according to one of five categories (easily eaten, eaten with difficulty, cannot be eaten, do not eat because of dislike, have not eaten since starting to wear dentures). In order to reduce the number of the initial 35 food items in the questionnaire, the correlation coefficient of the masticatory score, representing the masticatory ability before and after elimination of foods, was examined in all the subjects. The masticatory performance (MP) was also evaluated by a sieving method in all subjects.Results: In the questionnaire with 5 categories composed of 25 foods, the reliability coefficient (Cronbach’s α) was 0.939. There was significant correlation between the masticatory score using the 35 food item list and the new masticatory score using the new 25 food item list (r=0.95, P<0.01). There was significant correlation between the MP using the sieving method and the N-MS using the 25 food item list (r=0.62, P<0.01).Conclusion: It was confirmed that the new food intake questionnaire method, with a revised 25 food item list, was both valid and reliable.