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ORIGINAL ARTICLE
Year : 2021  |  Volume : 9  |  Issue : 4  |  Page : 103-106

Assessment of the effect of the length of orthodontic mini-screw implants on their long-term stability


1 Department of Orthodontics and Dentofacial Orthopaedics, Aditya Dental College and Hospital, Beed, Maharashtra, India
2 Department of Orthodontics and Dentofacial Orthopaedics, Yogita Dental College and Hospital, Khed, Ratnagiri, Maharashtra, India

Correspondence Address:
Dr. Ranjit Omprakash Pawar
Department of Orthodontics and Dentofacial Orthopaedics, Aditya Dental College and Hospital, Sarda Estate, Pimpalner Road, near Nalwandi Naka, Beed. 431122, Maharashtra.
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/INJO.INJO_33_21

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Background: In recent years, micro-screws have been widely used to reinforce anchorage during orthodontic therapy. Although micro-screws are now widely used clinically, biomechanical and histological research about the influence of loading protocols on the long-term stability of micro-screws is still confusing and limited. Aims and Objectives: The aim of this study is to assess the effect of the length of orthodontic mini-screw implant on their long-term stability. Materials and Methods: A total of 100 patients were included in the present study. Calculation of optical bone density was done in all the cases. Each patient received both the 6- and 8-mm long temporary intraoral skeletal anchorage devices (TISAD/TAD), in randomly selected mandibular quadrants (left or right). Loading of the TISAD/TAD was done with forces parallel to the occlusal plane by using NiTi springs. Results: It was observed that in Group 1 patients with 8 mm TISAD length, stability was seen in 80% of the cases, while failure occurred in 20% of the cases. In the Group 2 patients with 6 mm TISAD length, stability was seen in 70% of the cases, while failure occurred in 30% of the cases. Conclusion: In comparison to the 6 mm mini-screws, the stability of 8 mm orthodontic mini-screw implants is higher.


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