著者
Shun-ichiro HIRANO Tetsuya FUJIMOTO Hiroshi INOUE Kenji UCHIHASHI Yasuo NISHIKAWA
出版者
Osaka Odontological Society
雑誌
Journal of Osaka Dental University (ISSN:04752058)
巻号頁・発行日
vol.51, no.2, pp.151-156, 2017-10-25 (Released:2018-01-25)
参考文献数
13

The seating location in the classroom is thought to have a close relationship to the aca­ demic performance of each student. However, as teachers taking part in higher educa­ tion, we know that "common sense" must give way to many exceptional cases. To verify the truth of this widely held belief, we recorded the students' seating locations at a den­ tal hygiene college for many years, and correlated this information with their academic performance. As the rooms in which they were taught were identical, and the seating ar­ rangements were consistent throughout the years, it allowed us to analyze the data in a single environment. Many studies have reported that although students with poor grades sit in "low interaction" seats, students with good grades do not select "high interaction"seats, but rather prefer to occupy "moderate interaction" seats. Average or middle stu­ dents tended to have no favored location. We were not able to correlate each student's academic performance with her preferred seating location, especially in the case of high performing students. However, the pre­ ferred seating location for students with poor grades tended to follow commonly ac­ cepted norms which have been described in many reports. Our findings suggest that stu­ dents who are at risk of failing could be determined by where they sit in the classroom. This helps to identify the potentially unsuccessful candidates, and permits remedial ac­ tion at an early stage. (J Osaka Dent Univ 2017; 51: 151­-156)
著者
Yamamoto Kazuyo Takeuchi Osamu Zennyuu Kanji Fukui Masaki Suzuki Koichiro Hatsuoka Yoshinori Shiraishi Mitsuru
出版者
大阪歯科学会
雑誌
Journal of Osaka Dental University (ISSN:04752058)
巻号頁・発行日
vol.40, no.1, pp.37-42, 2006

We did an in vitro study on the bonding durability both to enamel and dentin of three fluoride-releasing enamel/dentin adhesive systems: experimental ABF and Imperva Fluorobond which are 2-step (self-etching primer+adhesive) systems, and Reactmer which is a 1-step (self-etching-priming-adhesive) system. The tensile bond strength was determined after 1 day and 1 year in 37℃ water. ABF showed high bond strength to enamel and dentin after 1 day. Although the bond strength to enamel was significantly degraded after 1 year, fractures were almost all cohesive failures in the bonding resin. Therefore, TBS values seemed to reflect the tensile strength of the bonding resin; the actual bond strength at the interface was probably greater than the values obtained from the tensile bond strength tests. Although Fluorobond had dentin bonding durability similar to ABF, its bond strength to enamel was inferior. Adhesive failures were mainly observed with enamel, indicating that the bonding durability to enamel was insufficient. In Reactmer, bond strengths both to enamel and dentin were significantly reduced after 1 year in water. The fractured surfaces were cohesive failures in the bonding resin for all specimens. These findings suggest that the bonding of ABF and Fluorobond to enamel and dentin was generally durable. The bond strength of Reactmer was less durable than the other two systems because of the fragile bonding resin.