Superelastic nickel titanium alloy retraction springs - An experimental investigation of force systems

Bourauel, C; Drescher, D; Ebling, J; Broome, D; Kanarachos, A

dc.contributor.author	Bourauel, C	en
dc.contributor.author	Drescher, D	en
dc.contributor.author	Ebling, J	en
dc.contributor.author	Broome, D	en
dc.contributor.author	Kanarachos, A	en
dc.date.accessioned	2014-03-01T01:13:26Z
dc.date.available	2014-03-01T01:13:26Z
dc.date.issued	1997	en
dc.identifier.issn	0141-5387	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12466
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031255548&partnerID=40&md5=6312acab0ce344f0fc4d280764db2b03	en
dc.subject.classification	Dentistry, Oral Surgery & Medicine	en
dc.subject.other	dental alloy	en
dc.subject.other	nickel	en
dc.subject.other	stainless steel	en
dc.subject.other	titanium	en
dc.subject.other	titanium nickelide	en
dc.subject.other	article	en
dc.subject.other	calibration	en
dc.subject.other	canine tooth	en
dc.subject.other	chemistry	en
dc.subject.other	elasticity	en
dc.subject.other	human	en
dc.subject.other	instrumentation	en
dc.subject.other	mechanical stress	en
dc.subject.other	orthodontic device	en
dc.subject.other	orthodontics	en
dc.subject.other	periodontal disease	en
dc.subject.other	reproducibility	en
dc.subject.other	surface property	en
dc.subject.other	torque	en
dc.subject.other	Calibration	en
dc.subject.other	Cuspid	en
dc.subject.other	Dental Alloys	en
dc.subject.other	Elasticity	en
dc.subject.other	Humans	en
dc.subject.other	Nickel	en
dc.subject.other	Orthodontic Appliance Design	en
dc.subject.other	Orthodontic Wires	en
dc.subject.other	Reproducibility of Results	en
dc.subject.other	Stainless Steel	en
dc.subject.other	Stress, Mechanical	en
dc.subject.other	Surface Properties	en
dc.subject.other	Titanium	en
dc.subject.other	Tooth Movement	en
dc.subject.other	Torque	en
dc.title	Superelastic nickel titanium alloy retraction springs - An experimental investigation of force systems	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The purpose of the present investigation was to study the mechanical characteristics of canine retraction springs made of superelastic nickel titanium (NiTi) alloys. A modified Burstone T-loop was used to construct an experimental canine retraction spring 10 mm in height and 10 mm in length. Twenty-five NiTi T-segments were hand made from the superelastic orthodontic alloys Ormco NiTi and Soar Sentalloy (dimensions 0.016 x 0.022 ''). The T-segments were equipped with arms made of rectangular standard steel wire (0.017 x 0.025 ''). The following geometrical and mechanical parameters of the retraction springs were analysed: radius and bending angles of the T-segments, distalizing force and M/F ratio during activation and the force/deflection rate of the springs. The error in the geometric parameters was in the range of 5-10 per cent, irrespective of the alloy used to produce the T-segments. On the other hand, the force systems of the springs were strongly influenced by the alloy and the batch under investigation. There were differences in the distalizing force of up to 100 per cent, i.e. at the beginning of the unloading plateau the distalizing force varied from 0.4 to 2.5 N. The force/deflection rate varied between a value of 0.06 and 0.15 N/mm, whereas the moment/force ratio reached values of 6.5-7.0 mm. Within a single batch, a reproducibility of these mechanical properties of approximately 5 per cent could be obtained. These results confirm that each orthodontic device made of superelastic NiTi alloys has to be calibrated individually. The manufacturers should pay more attention to keeping the material properties of their NiTi alloys constant.	en
heal.publisher	OXFORD UNIV PRESS	en
heal.journalName	European Journal of Orthodontics	en
dc.identifier.isi	ISI:A1997YE57500003	en
dc.identifier.volume	19	en
dc.identifier.issue	5	en
dc.identifier.spage	491	en
dc.identifier.epage	500	en