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dc.contributor.advisorGalang, Maria T.en_US
dc.contributor.authorObaisi, Noor A.en_US
dc.date.accessioned2013-06-28T17:26:39Z
dc.date.available2013-06-28T17:26:39Z
dc.date.created2013-05en_US
dc.date.issued2013-06-28
dc.date.submitted2013-05en_US
dc.identifier.urihttp://hdl.handle.net/10027/9913
dc.description.abstractCurrently, 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.isoenen_US
dc.rightsCopyright 2013 Noor A. Obaisien_US
dc.subjectNickel-Titanium (NiTi)en_US
dc.subjectTransformation Temperatureen_US
dc.subjectThermal NiTien_US
dc.subjectThermoelasticen_US
dc.subjectOrthodonticen_US
dc.subjectBend and Free Recovery (BFR)en_US
dc.subjectDifferential Scanning Calorimetry (DSC)en_US
dc.titleDetermination of the Transformation Temperature Ranges of Orthodontic Nickel-Titanium Archwiresen_US
thesis.degree.departmentOrthodonticsen_US
thesis.degree.disciplineOral Sciencesen_US
thesis.degree.grantorUniversity of Illinois at Chicagoen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMS, Master of Scienceen_US
dc.type.genrethesisen_US
dc.contributor.committeeMemberEvans, Carlaen_US
dc.contributor.committeeMemberTsay, Tzong Guang Peteren_US
dc.type.materialtexten_US


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