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| 008 | 220704s2021 ua a|||f bm|| 00| 0 eng d | ||
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_aeng _bara |
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_223 _a617.643 _bS.O.A |
| 100 | 1 |
_aSalama, Omar Ahmed El-sayed _eauthor. |
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| 245 | 1 | 0 |
_aAlterations in the mechanical properties of different brands of Nickel Titanium orthodontic archwires following their exposure to the oral environment in adult patients with moderate crowding : _bA Prospective Clinical Trial / _cBy Omar Ahmed El-sayed Salama; Supervisors : Prof. Dr. Essam Nassif Professor in Orthodontics and Dentofacial Orthopedics Faculty of Dentistry Cairo University, Prof. Dr. Fouad El Sharaby Associate Professor in Orthodontics Faculty of Dentistry Cairo University, Dr. Amira Aboalnaga Lecturer in Orthodontics Faculty of Dentistry Cairo University |
| 246 | 3 | 5 | _aتغيرات الخصائص الميكانيكية لاسلاك التقويم بعلامات تجارية مختلفة المصنعة من النيكل تايتانيوم بعد تعرضها لبيئة الفم للبالغين الذين يعانون من إزدحام متوسط فى الاسنان : تجربة سريرية مستقبلية. |
| 264 | 0 | _c2021 | |
| 300 |
_a164 pages : _billustrations (chiefly color) ; _c30 cm |
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| 336 |
_2rdacontent _atext _btxt |
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| 337 |
_2rdamedia _aunmediated _bn |
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| 338 |
_2rdacarrier _avolume _bnc |
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| 500 | _aSupervisors : Prof. Dr. Essam Nassif Professor in Orthodontics and Dentofacial Orthopedics Faculty of Dentistry Cairo University, Prof. Dr. Fouad El Sharaby Associate Professor in Orthodontics Faculty of Dentistry Cairo University, Dr. Amira Aboalnaga Lecturer in Orthodontics Faculty of Dentistry Cairo University | ||
| 502 | _aThesis (M.Sc.)--Future University in Egypt, Faculty of Oral and Dental Medicine, Orthodantics Department , 2021. | ||
| 504 | _aIncludes bibliographical references (pages 127-148) | ||
| 520 | 3 | _aThis present study was conducted to evaluate the change in mechanical properties of different brands of Nickel Titanium archwires following their exposure to oral environment. The 117 wires were randomly divided into three groups (A), (B) and (C) according to brand of 0.016” round NiTi archwires; each of 39 archwires. Group A: Dentaurum Group B: American Orthodontics Group C: IMD Orthodontics Each group was further subdivided into 3 different subgroups (1), (2) and (3) according to intervention method, each of 13 archwires. Subgroup 1 (IN VIVO): The wires were placed intraorally for 8-12 weeks for leveling and alignment stage. Subgroup 2 (AS RECEIVED): The wires were measured as received from the manufacturer (negative control group). Subgroup 3 (IN VITRO): The wires as received from the manufacturer were placed in artificial saliva for 8 weeks (positive control). The results of the study were: Condition, regardless of wire brand, had a statistically significant effect on mean plateau slope, resilience, elastic modulus. As regards American Orthodontics wire, there was a statistically significant increase in mean Plateau slope after storage in artificial saliva as well as a statistically significant increase after usage in the patient’s mouth. While for Dentaurum and IMD Orthodontics wires, there was no statistically significant change in mean Plateau slope after storage in artificial saliva followed by a statistically significant increase after usage in the patient’s mouth As regards American Orthodontics as well as IMD Orthodontics wires, there was a statistically significant decrease in mean resilience after storage in artificial saliva as well as a statistically significant decrease after usage in the patient’s mouth. While for Dentaurum wires, there was a statistically significant increase in mean resilience after storage in artificial saliva followed by a statistically significant decrease after usage in the patient’s mouth. There was no statistically significant difference between resilience of new wires and wires used in the oral cavity. As regards American Orthodontics as well as Dentaurum wires, there was no statistically significant change in mean modulus of elasticity after storage in artificial saliva followed by a statistically significant decrease after usage in the patient’s mouth. While for IMD Orthodontics wires, there was a statistically significant decrease in mean modulus of elasticity after storage in artificial saliva followed by non-statistically significant change after usage in the oral cavity. There was no permanent deformation present in any of the samples after comparing pre- and post-operative stereomicroscopic photographs. In summary of the in-vitro studies, Dentaurum group showed desirable properties such as the release of light, continuous and almost constant forces during an extended period of activation. Yet, the wire brand had no statistically significant effect on mean Little’s Index, so from the clinical perspective, all the wire brands performed the same in terms of resolution of crowding | |
| 546 | _aText in English, Abstract in English and Arabic . | ||
| 650 | 0 | _aOrthodontics, Corrective. | |
| 650 | 0 | _aOrthodontics. | |
| 700 | 1 |
_aNassif, Essam _933942 _eSupervisor |
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| 700 | 1 |
_aEl-Sharaby, Fouad Aly _929801 _eSupervisor |
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| 700 | 1 |
_aAboalnaga, Amira _933943 _eSupervisor |
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| 856 | 4 | 0 | _uhttp://repository.fue.edu.eg/xmlui/handle/123456789/6060 |
| 942 | _cTHESIS | ||