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Article
Effect of chlorhexidine mouth wash and flouridated mouth wash on mechanical properties of orthodontic arch wires (An in vitro study)

Authors: Khawla M Awni --- Hind T Jarjees --- Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S150-S159
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aims of the this study were to measure the effect of chlorhexidine and fluoridated mouth wash on mechanical properties of stainless steel and nickel titanium wires and to study the effect of three time intervals (3, 7, and 10 days) immersion on these mechanical properties. Materials and Methods: Two types of orthodontic wires were taken which included stainless steel and superelastic nickel titanium wires (Dentaurum, Germany). The 0.016×0.016 inch wires were selected. Each type of wires divided into seven groups; control group and six experimental groups in which the wires immersed in the chlorhexidine and fluoridated mouth wash for 3, 7, and 10 days and then the mechanical properties of wires (yield stress, ultimate tensile stress, modulus of elasticity) measured by using the universal tensile testing machine. Results: The results of the present study showed that a significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the fluoridated mouth wash and this decreased in the mechanical properties as immersion time increased. Also the results of the present study showed that a non significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the chlorhexidine mouth wash. Conclusions: The results of the present study indicated that the fluoridated mouth wash decreased the mechanical properties of stainless steel and nickel titanium wires and this degradation in mechanical properties could contributed to prolong orthodontic treatment. While the chlorhexidine has no effect on mechanical properties of stainless steel and nickel titanium wires


Article
MECHANICAL ANALYSIS OF ORTHODONTIC WIRES
التحلیل المیكانیكي لألأسلالاك تقویم الألأسنان

Author: Aseel Mohammed Ali Hussein أسیل محمد علي حسین
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2012 Volume: 5 Issue: 1 Pages: 172-180
Publisher: Diyala University جامعة ديالى

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Abstract

ABSTRACT: Orthodontic tooth movement is a physiologic response to externally applied forces; the motive forces are primarily mechanical. The optimal application of orthodontic force enables maximum movement of teeth with minimal irreversible damage of the periodontal ligament (PDL), alveolar bone, and teeth. Since arch wires are the main forcesystem in orthodontics, it is important in clinical practice that they deliver appropriate, predictable and repeatable forces during treatment. These specialized wires even promise shape memory properties and the possibility of super elastic behavior, which significantlyimpacts clinical practices. Since, standard stainless steel and titanium arch wires are still the materials of choice in many stages of treatment. They provide an attractive combination of stiffness, resilience and formability. However, clinical practitioners have commented on the variability of arch wire behavior for years. Inconsistent arch wire properties can contribute to unpredictable treatment duration and results.This paper examines the mechanical and physical characteristics of stainless steel and titanium wires to quantify their variability in engineering terms. From the results for both types of wires, the testing method provides the information required by designers wishing toimprove the arch wire properties and provide valuable information to clinicians for their practice.Keywords: orthodontics, mechanical properties, tensile properties, orthodontic wires,titanium, stainless steel.

الخلاصة:حركة الأسنان أثناء التقویم تمثل عملیة استجابة فسلجیة لقوى خارجیة، والتي غالبا ما تكون هذه القوى میكانیكیة. التطبیق الأمثل لقوى التقویم تسمح بحركة قصوى للأسنان مصاحب بضرر بسیط للأسنان،الأربطة المحیطة بالأسنان، وعظم السنخى.تعتبر الأسلاك المتقوسة المصدر الأساسي لتسلیط القوة في جهاز التقویم. فمن خلاله یمكن أن نسلط قوة مناسبة خلال جلسات العلاج حیث ان لشكل السلك وسلوكه المرن تأثیر واضح على فترة العلاج. إلى حد هذه الفترة تعتبر أسلاكالتیتانیوم والستینلس ستیل الخیار الأمثل في المراحل العلاجیة المختلفة لتقویم الأسنان وذلك لأنها تجمع بین خاصیة الصلابة، المرونة، وقابلیة التشكیل في جهاز التقویم. من ناحیة أخرى، یعاني أطباء الأسنان وخلال سنوات من عدم القدرة على تحدید فترة التقویم حیث یعزى ذلك لتضارب الخواص المیكانیكیة للأسلاك المستخدمة في التقویم من سلك لآخر.انطلاقا من الدور الذي یؤدیه السلك في أداء جهاز التقویم انشأ هذا البحث والذي اهتم بدراسة الخواص المیكانیكیة لأسلاك التیتانیوم والستینلس ستیل لتحدید المتغیرات التي تحدث ضمن الحدود الهندسیة. كما حددت النتائج الخواص المیكانیكیة الواجب توفرها في ألأسلاك المستخدمة في التقویم.

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