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The effect of orthodontic clinical use on the mechanical characteristics of nickel-titanium closed-coil springs.
Geng, Haixia; Su, Hongli; Whitley, John; Lin, Feng-Chang; Xu, Xin; Ko, Ching-Chang.
Afiliación
  • Geng H; 1 Department of Dentistry, Affiliated Hospital of Jining Medical College, Jining, Shandong Province, China.
  • Su H; 2 Department of Orthodontics, Shandong University, Jinan, Shandong Province, China.
  • Whitley J; 3 Stomatology School, Weifang Medical University, Weifang, Shandong Province, China.
  • Lin FC; 4 Oral and Craniofacial Health Sciences, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA.
  • Xu X; 5 Department of Biostatistics, University of North Carolina, Chapel Hill, NC, USA.
  • Ko CC; 6 School of Stomatology, Shandong University, Jinan, Shandong Province, China.
J Int Med Res ; 47(2): 803-814, 2019 Feb.
Article en En | MEDLINE | ID: mdl-30616411
OBJECTIVE: To examine the effect of clinical use on both force retention and the deactivation of closed-coil nickel-titanium (NiTi) springs in a 16-week trial. METHODS: The force-activation curves for NiTi springs were determined before and after clinical use. The rate of tooth movement and maximum force (MF), hysteresis between activation and deactivation, and mean force of the deactivation plateau (MDF) were examined and correlated as a function of 4, 8, 12 and 16 weeks of clinical use. To recover the force properties, the springs were heat treated at 100°C and the results were compared with the preceding data. RESULTS: A total of 36 springs were analysed. The MF loss after use was 60, 74, 55, and 48 g for the 4-, 8-, 12- and 16-week springs, respectively. Heat treating had little effect on the MF. Clinical use lowered hysteresis by a mean of 180 g*mm compared with the pre-clinical use data, and heat treating increased the hysteresis by a mean of 59 g*mm above the post clinic testing data. The MDF was nominally 100 g less than the MF. Teeth moved approximately 1 mm/month, independent of the force loss. CONCLUSIONS: The loss of MF and the lowering of the MDF was not time dependent. Heat treating can partially recover the mechanical properties of the used springs.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Alambres para Ortodoncia / Titanio / Cierre del Espacio Ortodóncico / Aleaciones Dentales / Níquel Tipo de estudio: Observational_studies / Prognostic_studies Límite: Adolescent / Child / Female / Humans / Male Idioma: En Revista: J Int Med Res Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Alambres para Ortodoncia / Titanio / Cierre del Espacio Ortodóncico / Aleaciones Dentales / Níquel Tipo de estudio: Observational_studies / Prognostic_studies Límite: Adolescent / Child / Female / Humans / Male Idioma: En Revista: J Int Med Res Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido