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Volume 64 (2014)
- Issue 5 Pages 382-
- Issue 4 Pages 328-
- Issue 3 Pages 261-
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Volume 64, Issue 4
Displaying 1-4 of 4 articles from this issue
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ORIGINAL ARTICLE
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Tatsuya MACHIDA, Shinsuke MIZUTANI, Kota KATAOKA, Mayu YAMANE, Takayuk ...2014 Volume 64 Issue 4 Pages 328-335
Published: July 30, 2014
Released on J-STAGE: April 13, 2018
JOURNAL FREE ACCESSThe relationship between oral health and respiratory disease has been increasingly debated over recent decades. Partially erupted third molars can increase food packing and plaque retention, which may increase microorganisms in tissue around the third molars and affect the surrounding tissue, including the upper respiratory tract. The purpose of this cross-sectional study was to examine the relationship between episodes of upper respiratory tract infection and the eruption pattern of third molars in university students aged 18-20, when wisdom teeth generally appear.
Of 2,205 first-year students, with an average age of 18.5±2.1 years old (18 to 67 years old), who underwent an oral examination at the Health Service Center of Okayama University in April 2013, 1,964 students (1,130 males, 834 females), aged 18 to 20 years, who were non-smokers and without missing data were analyzed. We examined the oral health status, including the Simplified Oral Hygiene Index (OHI-S), Community Periodontal Index, and eruption pattern of third molars. Students completed a self-reported questionnaire including items of episodes of upper respiratory infection during the past year. We divided the subjects into two groups: with or without experience of the 3 or more episodes of the common cold during the past year. A Chi square test was conducted for the two groups as well as a multivariate logistic regression analysis.
According to the Chi square test, there were significant differences in the eruption pattern of third molars and history of gum pain behind the most posterior molars in the past year between the two groups (P<0.05). A similar trend was observed for OHI-S, although it was not significant (P=0.054). According to logistic regression analysis, which used the sex, OHI-S, eruption pattern of the third molars, and history of gum pain behind last molars in the past year as independent variables, the experience of 3 or more episodes of upper respiratory tract infection was significantly correlated with having 1 or more partially erupted third molars (odds ratio; 1.53, 95% confidence interval: 1.16-2.02, P=0.003), with having no erupted third molars as a reference. In conclusion, having partially erupted third molars was significantly correlated with a higher prevalence of self-reported upper respiratory tract infection episodes in Japanese university students.View full abstractDownload PDF (308K) -
Akira OGURO2014 Volume 64 Issue 4 Pages 336-342
Published: July 30, 2014
Released on J-STAGE: April 13, 2018
JOURNAL FREE ACCESSTo understand the solubility of tooth enamel surface/calcium phosphate(s), dissolved [Ca] and [Pi] in lactic acid (aq)/media from freshly extracted 1st premolars were measured with dissolution times of 5 and 10 min by ICPS. Despite the underlying complex dissolution phenomena on the enamel surface, (1) the outermost layer/surface of the enamel should be overlaid by amorphous calcium phosphate (ACP) with a Ca/P molar ratio of 2.0-2.5 or 2.0; (2) the solubility of the enamel surface depends on the pH and concentrations of calcium phosphates and other influential ions in the abutting solution, self-regulating the Ca/P molar ratio of ACP possibly by the homo/heterogeneous crystal nucleation and growth.View full abstractDownload PDF (286K)
REPORT
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Kazumasa ABE, Jun KITAGAWA, Kazunori NAKAKUKI2014 Volume 64 Issue 4 Pages 343-350
Published: July 30, 2014
Released on J-STAGE: April 13, 2018
JOURNAL FREE ACCESSSmoking causes many diseases in not only smokers, but also non-smokers. Therefore, it is critical for dental associations to take action against smoking. In October of 2012, we examined the situation regarding anti-smoking activities of the Japan Dental Association and 47 prefectural dental associations, and compared the results with those of a questionnaire survey conducted in 2003 and 2004.
Areas used for scientific meetings (92%), seminars and workshops (92%), and exhibits (88%) are very likely to prohibit smoking. However, convivial party areas and lobbies or waiting areas are not as strict in prohibiting smoking (48〜73%).
Dental associations need to enforce non-smoking rules for both inside buildings and the surrounding areas. The need to strongly enforce non-smoking rules has been increasing over the past 9 years.
However, almost 88 percent of dental associations do not question their own members about smoking.
Dental associations are highly aware (94%) of the "Health Promotion Act" enacted by the Ministry of Health, Labour and Welfare. However, awareness is very low (56%) of the FCTC (Framework Convention on Tobacco Control created by the WHO).
Dental associations have made many improvements with regard to limiting tobacco-friendly environments within their organizations. However, there are still many more improvements yet to be made.View full abstractDownload PDF (785K) -
Koichiro JIN, Takashi DOI, Koji KAWASAKI, Masako UENE, Hideaki HATAYAM ...2014 Volume 64 Issue 4 Pages 351-358
Published: July 30, 2014
Released on J-STAGE: April 13, 2018
JOURNAL FREE ACCESS
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