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Year : 2012  |  Volume : 1  |  Issue : 1  |  Page : 16-22

Reliable coupling of orthodontic elements to mini-implants: An in-vitro study

1 Department of Orthodontics, University of Homburg / Saar Kirrberger Strasse 1, D- 66421 Homburg / Saar, Germany
2 Department of Prosthodontics, Johann Wolfgang Goethe University Frankfurt, Germany
3 Private Office, Friedhofweg 5, 92676 Eschenbach, Germany
4 Department of Orthodontics, Tel Aviv University, Israel, Israel
5 Department of Dentofacial Orthopedics and Orthodontics, Wroclaw Medical University, Poland

Correspondence Address:
Björn Ludwig
Am Bahnhof 54, D - 56841 Traben-Trarbach
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2278-0203.94774

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Objectives: To investigate the reliability of mechanical and adhesive methods of fixing rectangular wires in the cross-slot of a mini-implant. Materials and Methods: A twin-hooked wire element was placed and fixed in the slot of a mini-implant via a NiTi spring under tension, or by means of an adhesive. For the purpose of mechanical anchorage, the wire was crimped with a special crimping tool to increase its thickness and prevent it from slipping through the slot. Before applying the adhesive, there were four possible methods of preparation: Untreated Wire (Adh. 1); ROCATEC-Pre (Adh. 2); ROCATEC-PRE + Espe Sil (Adh. 3); ROCATEC-PRE + ROCATEC-PLUS + Espe Sil (Adh. 4). The mechanical fixing and two adhesive fixings were aged by means of temperature change (500 cycles). A Zwick universal testing machine was used to measure the maximum strength of the coupling. Results: In all tests, the untreated wire + adhesive withstood the lowest maximum load (Ø 3 N and 10.8 N respectively) and failed the aging test after a maximum of eight cycles. The wires in test group Adh. 4 withstood the highest maximum load (Ø 43.3 N; 41.5 N; 45.9 N after aging) in all tests. The average load withstood by the crimped ligature was 38.7 N. Conclusion: The adhesive method of fixation performs best when the rectangular wire is sand blasted and silanized before application. The mechanical coupling using the crimped ligature is reliable.

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