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Influence of EDTA on Demineralization Rate of dentine:Calcification Treatment in Root Canal Therapy

Journal of Materials Science & Technology 2014年第7期30卷 692-698页

作者： Yang Ji Min He Shijie Chang Xiaodong Zhang Huazhe Yang Department of Stomatology General Hospital of Shenyang Military Area Command College of Biomedical Engineering Chongqing Medical University College of Basic Medical Science China Medical University

The aim of this study was to investigate the influence of ethylenediaminetetraacetic acid （EDTA） irrigation on demineralization rate of dentine located in the apical third of root canal walls. Teeth were divided into A and B two groups. In group A, all of the teeth was irrigated with EDTA and NaOCI （sodium hypochlorite）, followed by cutting the apical third into slices longitudinally to examine the influence of EDTA on different portions of apical third of root canal. In group B, the apical third of a tooth was firstly cut into slices longitudinally, followed by coating the root canal walls with EDTA to in-situ observe the demineralization of dentine with different time. It was found that the influence of EDTA on root-canal was gradually increased from the apical to the upper end of the apical third for group A. In addition, the demineralization rate of dentine was remarkable in the first 25 min for group B. The diffusion of EDTA into root dentine would lead to potential damage to the dentine. Furthermore, demineralization rate curve was calculated.

关键词： Ethylenediaminetetraacetic acid (EDTA) Root canal Demineralization dentine

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The Prevalence of dentine Hypersensitivity and Gingival Recession among Jordanian Patients at JUST Dental Teaching Center

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Open Journal of Stomatology 2014年第11期4卷 497-506页

作者： H. Kamal R. O. Abu Hantash D. Q. Taani M. M. Hammad Head Department of Periodontology Faculty of Dentistry AL-Quds University Jerusalem Palestine Faculty of Dentistry Al-Quds University Jerusalem Palestine Jordan University of Science and Technology Irbid Jordan

Aims: to determine the prevalence of gingival recession and dentine hypersensitivity among the study population, and evaluate the distribution of dentine hypersensitivity among various types of teeth in mild, moderate and severe degrees of gingival recession. Relationship between the severity of gingival recession and dentine hypersensitivity was also evaluated. Materials and Methods: Clinical examination was conducted on six hundred and seventy-six patients (283 males and 393 females). Their ages ranged from 18 to 74 years old (mean 35.4, SD = 11.2). A valid and reliable questionnaire was filled by the participated patients. Results: The prevalence of gingival recession was 79.0%, and the prevalence of dentine hypersensitivity within the patients with gingival recession was 23.6%. The most common teeth affected by dentine hypersensitivity were the lower incisors. dentine hypersensitivity was more commonly found in teeth with mild recession. Conclusion: Increased gingival recession does not necessarily mean increased incidence of dentine hypersensitivity.

关键词： dentine Hypersensitivity

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“Alas poor Yorick”: What retrospective analysis of canine skulls can tell us about the impact of environmental factors on health

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Open Journal of Animal Sciences 2013年第3期3卷 12-18页

作者： Luciano O. Valenzuela Kevin Chase Lawrence McGill Shawn Miller Mark Nielsen Karl G. Lark ARUP Animal Reference Pathology Division Salt Lake City USA Department of Biology University of Utah Salt Lake City USA Department of Biology University of Utah Salt Lake City USA Laboratorio de Ecología Evolutiva Humana CONICET Universidad Centro de la Provincia de Buenos Aires Buenos Aires Argentina

Necropsies and extensive histological evaluation for clinical and sub-clinical disease of approximately three hundred Portuguese Water dogs are available as part of an ongoing study to assess their state of health at the end of life. Throughout life these dogs enjoyed a variety of lifestyles and environments. Here we carry out retrospective quantitative assessments of life-time dietary input and physical activity for each dog. To do this, collagens from skull vault bone and from dentine have been analyzed for ratios of stable isotopes to determine differences in diet that individual dogs experienced during late or early life respectively. Robustness of skull bone (weight/unit of skull size) was used as a relative indicator of the amount of physical activity experienced during a dog’s lifetime. These environmental parameters were correlated with the frequency and severity of specific disease processes determined at necropsy. Both measures were shown to exert significant low-level

关键词： Portuguese Water Dog Necropsy Histopathology Exercise Nutrition Stable Isotope Skull dentine Collagen

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