| dc.contributor.advisor | Galang, Maria T. | en_US |
| dc.contributor.author | Obaisi, Noor A. | en_US |
| dc.date.accessioned | 2013-06-28T17:26:39Z | |
| dc.date.available | 2013-06-28T17:26:39Z | |
| dc.date.created | 2013-05 | en_US |
| dc.date.issued | 2013-06-28 | |
| dc.date.submitted | 2013-05 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10027/9913 | |
| dc.description.abstract | Currently, manufacturers utilize no standard method for testing orthodontic Nickel-Titanium (Ni-Ti) archwires. The majority of published orthodontic studies use Differential Scanning Calorimetry (DSC) to test the Transformation Temperature Range (TTR) of Ni-Ti wires, but the Bend and Free Recovery Test (BFR) method may be more clinically applicable. Objective: To compare the Transformation Temperature Range (TTR) values, As and Af, of thermoelastic Ni-Ti archwires between: (1) Bend and Free Recovery (BFR) and Differential Scanning Calorimetry (DSC) test methods, (2) two wire sizes, (3) two wire brands, (4) two lots, and (5) tested and manufacturer-listed values. Methods: Eighty orthodontic Ni-Ti archwires were divided into 2 groups tested using BFR or DSC. Groups were further divided based on manufacturer: Rocky Mountain Orthodontics (RMO) and Opal Orthodontics (Opal) and wire size: round (0.016 in.) and rectangular (0.019x0.025 in.), resulting in 8 subgroups. Each subgroup consisted of wires from two lots. Austenite start (As) and austenite final (Af) temperatures were recorded. Data analysis was performed using Student t-tests (α≤0.05). Results: Statistically significant mean differences were observed: (1) between BFR and DSC for all As values and most Af values; (2) between wire sizes for all BFR-tested wires; (3) between brands for half of the BFR-tested groups and half of the DSC-tested groups; (4) between most lots; (5) between all tested and listed Af values by Opal and RMO. Conclusions: TTR values are comparable between DSC and BFR, but BFR is a more economical and clinically relevant method, enabling testing on unmodified, as-received wires. All wires fully transitioned to austenite well before their manufacturer-listed temperatures. | en_US |
| dc.language.iso | en | en_US |
| dc.rights | Copyright 2013 Noor A. Obaisi | en_US |
| dc.subject | Nickel-Titanium (NiTi) | en_US |
| dc.subject | Transformation Temperature | en_US |
| dc.subject | Thermal NiTi | en_US |
| dc.subject | Thermoelastic | en_US |
| dc.subject | Orthodontic | en_US |
| dc.subject | Bend and Free Recovery (BFR) | en_US |
| dc.subject | Differential Scanning Calorimetry (DSC) | en_US |
| dc.title | Determination of the Transformation Temperature Ranges of Orthodontic Nickel-Titanium Archwires | en_US |
| thesis.degree.department | Orthodontics | en_US |
| thesis.degree.discipline | Oral Sciences | en_US |
| thesis.degree.grantor | University of Illinois at Chicago | en_US |
| thesis.degree.level | Masters | en_US |
| thesis.degree.name | MS, Master of Science | en_US |
| dc.type.genre | thesis | en_US |
| dc.contributor.committeeMember | Evans, Carla | en_US |
| dc.contributor.committeeMember | Tsay, Tzong Guang Peter | en_US |
| dc.type.material | text | en_US |
