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Brazilian Journal of Oral Sciences

versão On-line ISSN 1677-3225

Braz. J. Oral Sci. vol.9 no.1 Piracicaba Jan./Mar. 2010




Analysis of mechanical properties and forces produced by transpalatal bars made from low-nickel alloy



Matheus M. PithonI; Rogério L. dos SantosI; Ana Maria BologneseII; Eduardo Franzotti Sant´annaII; Margareth Maria Gomes de SouzaII

IDDS, MSc, Doctorate Student in Orthodontics, Federal University of Rio de Janeiro, Brazil
IIDD, MSc, PhD, Adjunct Professor, Department of Orthodontics, Dental School, Federal University of Rio de Janeiro, Brazil
IIIDepartment of Orthodontics, Dental School, Federal University of Rio de Janeiro, Brazil





AIM: This study evaluated assess the mechanical properties and forces produced by transpalatal bars made from low-nickel alloy.
METHODS: Using a template, a single operator made all transpalatal bars from 0.032" and 0.036" wires of two different alloys, thus originating four groups, namely: A8 (0.032" conventional stainless steel), B8 (0.032" low-nickel stainless steel), A9 (0.036" conventional stainless steel), and B9 (0.036" low-nickel stainless steel). The bars were then activated and mounted onto a device developed to serve as a support for mechanical assay in a universal testing machine (Emic DL 10.000). The values of resilience and ductility were obtained using the Origin 8 software.
RESULTS: No statistically significant differences (P > 0.05) were observed between Groups A8 and B8 neither between A9 and B9 for 0.5-, 1.0-, and 5-mm deformations. However, statistically significant differences (P < 0.05) were found in all groups for 15-mm deformation. Groups B8 and B9 showed greater ductility and resilience compared to groups A8 and A9, respectively.
: Low-nickel stainless steel transpalatal bars release the same amount of force for activations less than 10 mm compared to those made from conventional stainless steel. Mechanically, the low-nickel stainless steel bars are more ductile and resilient.

Keywords: stainless steel, nickel, orthodontics.



Full text available only in PDF format.




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Correspondence to:
Margareth Maria Gomes de Souza
Universidade Federal do Rio de Janeiro - UFRJ
Faculdade de Odontologia - Depto. de Ortodontia
Av. Prof. Rodolpho Paulo Rocco, 325
Ilha do Fundão - Rio de Janeiro
CEP: 21941-617 - RJ - Brasil

Received for publication: October 06, 2009
Accepted: March 03, 2010