Superelastic and shape memory NiTi extension springs for mandibular distraction

• Autorzy: Lekston Z. , Drugacz J. , Morawiec H.
• Języki publikacji: EN

Abstrakty

EN

The article presents studies of the superelastic NiTi and shape memory TiNiCo devices for the experimental distraction of mandibular bones in young pigs. The new method of gradual bone lengthening has two variants. In the first one distraction devices make use of two U-shaped NiTi superelastic springs that are extend, with constant force, the corpus of the mandible enfeebled by the decortication. The other variant uses double Ω-shaped springs that use the shape memory effect during gradual heating by the electric current in the temperature range 40-55°C drawing the bone fragments after osteotomy. On the basis of the X-ray phase analysis and the DSC analysis the wires which after special treatment show superelasticity in ambient temperature and shape memory in the desirable temperature range of about 40 to 55°C were chosen. Prototypes of the distractors were fabricated, suitable shapes and dimensions were selected, and different ways to fix them to the bones were tested on the models. Forces of the superelastic arches generated during stretching and unloading and distraction forces of the shape memory distractors generated during the process to regain the shape while being heated by the electric current were measured. In animal experiments the operations were performed on two pigs where NiTi superelastic distraction devices and TiNiCo shape memory distractors were used and placed subcutaneously, immediately on the bone under the periosteum. As a result of animal experiments about 10 mm lengthening of the pig mandible was obtained with the use of superelastic distraction devices.

Słowa kluczowe

EN

NiTi and TiNiCo shape memory alloys; superelastic wires NiTi springs; mandibular distraction

PL

NiTi i TiNiCo stopy z pamięcią kształtu; superelastyczne sprężyny z drutów NiTi

• Wydawca: University of Silesia, Institute of Informatics, Computer Systems Department
• Czasopismo: Journal of Medical Informatics & Technologies
• Rocznik: 2002
• Tom: Vol. 4
• Strony: MT91--99
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Lekston Z.

• Institute of Physics and Chemistry of Metals, 40-007 Katowice, Bankowa 12, Poland

autor

Drugacz J.

• II Faculty and Clinic of Maxillofacial Surgery, 40-027 Katowice, Francuska 20/24, Poland

autor

Morawiec H.

• Institute of Physics and Chemistry of Metals, 40-007 Katowice, Bankowa 12, Poland

Bibliografia

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