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Journal of Dental Research, Dental Clinics, Dental prospects، جلد ۹، شماره ۴، صفحات ۲۵۴-۲۶۰
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عنوان انگلیسی Evaluation of force degradation pattern of elastomeric ligatures and elastomeric separators in active tieback state
چکیده انگلیسی مقاله Background and aims. The purpose of this study was to evaluate initial force and force decay of commercially available elastomeric ligatures and elastomeric separators in active tieback state in a simulated oral environment. Materials and methods. A total of 288 elastomeric ligatures and elastomeric separators from three manufacturers (Dentaurum, RMO, 3M Unitek) were stretched to 100% and 150% of their original inner diameter. Force levels were measured initially and at 3-minute, 24-hour, and 1-, 2-, 3- and 4-week intervals. Data were analyzed by univariate analysis of variance and a post hoc Tukey test. Results. The means of initial forces of elastomeric ligatures and separators from three above-mentioned companies, when stretched to 100% of their inner diameters, were 199, 305 and 284 g, and 330, 416, 330 g; when they were stretched to 150% of their inner diameters the values were 286, 422 and 375 g, and 433, 540 and 504 g, respectively. In active tieback state, 11‒18% of the initial force of the specimens was lost within the first 3 minutes and 29‒63% of the force decay occurred in the first 24 hours; then force decay rate decreased. 62‒81% of the initial force was lost in 4 weeks. Although force decay pattern was identical in all the products, the initial force and force decay of Dentaurum elastomeric products were less than the similar products of other companies (P< 0.05). Under the same conditions, the force of elastomeric separators was greater than elastomeric ligatures of the same company. Conclusion. Regarding the force pattern of elastomeric ligatures and separators and optimal force for tooth movement, many of these products can be selected for applying orthodontic forces in active tieback state.
کلیدواژه‌های انگلیسی مقاله Dental implant,finite element analysis,maxilla
نویسندگان مقاله امیر محمدی | amir mohammadi
assistant professor, department of orthodontics, dental faculty, tabriz university of medical sciences, tabriz, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

فرهنگ محمودی | farhang mahmoodi
assistant professor, department of orthodontics, dental faculty, azad university, tehran, iran
نشانی اینترنتی http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/1838
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/183/article-183-319658.pdf
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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