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Year : 2007  |  Volume : 7  |  Issue : 3  |  Page : 118-122

The curvature of the retentive arm in a circumferential clasp and its effect on the retention: 3D analysis using finite element method

1 Department of Orthodontics and Dental Research Center, Tehran University of Medical Sciences (DRC-TUMS), Tehran, Iran
2 Department of Prosthodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Correspondence Address:
Allahyar Geramy
Department of Orthodontics, Ghods Ave, Enghelab St., School of Dental Medicine, Tehran University of Medical Sciences, Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-4052.37654

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Introduction: Missed teeth are replaced to provide the patients with occlusal stability. Partial removable prosthodontics are still in use among the various applications in this field. Adequate retention is essential for its function. Circumferential clasps are used and the main goal of this study is to assess the importance of the geometry of the retentive arm and its effects on the quality of retention produced. Materials and Methods: Three-dimensional finite element method of analysis was selected to find answer to the questions. Three models were designed with the retentive arms of same lengths and different angular coverages (α is explained in text). 0.01″ to 0.03″ of displacements were applied and the forces derived. Results: Different amounts of retentive forces were produced, which were assessed in two directions. Conclusion: The greater the curve of a retentive arm, the greater the retention force produced, assuming that the length of retentive arm remains constant.

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