Multiple supernumerary teeth: a case report / 华西口腔医学杂志

Supernumerary teeth is one of the dysplasia that the number of the teeth are more than physical number. Most cases of reports were with 1-2 supernumerary teeth and rare cases were with more than 3 supernumerary teeth. A 17-year old female patient of 7 impacted supernumerary teeth were found because of toothache of premolar caused by impacted supernumerary teeth and were treated by extraction of impacted supernumerary teeth.

Maxillary second molar with two buccal and two lingual root canals: a case report / 华西口腔医学杂志

Incidence rate of 4 root canals in maxillary second molar is very low and most molars have only two mesiobuccal root canals. The emergence of 4 root canals in maxillary second molar with two lingual root canals is especially rare. A case of 4 root canals maxillary second molar with two lingual root canals was successfully treated and reported in this article.

Study on the quality of life and its influencing factors in Miao and Gelao Minority groups in Guizhou province / 中华流行病学杂志

<p><b>OBJECTIVE</b>To investigate and evaluate the quality of life and its influencing factors in Miao and Gelao Minority groups in Guizhou province with the aim of providing evidence for valid health promotion measures.</p><p><b>METHODS</b>Based on a self-designed questionnaire to evaluate the quality of life on 582 subjects. Kruskal-wallis test and stepwise regression analysis were used to test the quality of life and its influencing factors.</p><p><b>RESULTS</b>There were significant differences among the groups of quality of life and its influencing factors. The quality of life of Miao Minority was the highest and Gelao the lowest. Sex, age, acute disease prevalence of the past two-weeks, prevalence of chronic diseases, drinking unboiled water, tobacco-smoking habit, educational level and the family expenditure on life were correlated with all or most of the domains of quality of life.</p><p><b>CONCLUSION</b>The key steps on quality of life promotion should include: strengthening the basis medical health service, pushing cooperative medical service, enhancing prevention and care of chronic diseases, speeding the development of economics etc.</p>