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ORIGINAL ARTICLE
Year : 2019  |  Volume : 53  |  Issue : 1  |  Page : 27-37

Evaluation of tooth surface characteristics after application of intrusive orthodontic forces using scanning electron microscope: An In vivo study


1 Private Practice, Sant Baba Rangi Ram Ji Charitable Hospital (Regd), V.P.O. Jaja, Hoshiarpur, Punjab, India
2 Prof. and Head of Department, Department of Orthodontics, SGT Dental College and Research Institute, Gurgaon, Haryana, India
3 Prof., Department of Orthodontics, SGT Dental College and Research Institute, Gurgaon, Haryana, India
4 Senior Lecturer, Department of Orthodontics, SGT Dental College and Research Institute, Gurgaon, Haryana, India

Correspondence Address:
Dr. Seema Grover
Department of Orthodontics, SGT Dental College and Research Institute, Gurgaon, Haryana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jios.jios_55_18

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Introduction: Orthodontic forces when applied to tooth structure leads to some amount of resorption depending upon force duration and magnitude applied. Study aimed to evaluate tooth surface changes after application of intrusive orthodontic forces using scanning electron microscope. Materials and Methods: 20 patients were selected requiring first premolar extraction for treatment of malocclusion with fixed mechanotherapy and were divided into four groups. Group I and III consisted application of 50 gm of light force on right side and left side respectively for 4 weeks intervals. Group II and IV consisted application of 150 gm of heavy force on right side and left side respectively for 8 weeks intervals. A cantilever spring was attached from buccal tube of molar band to bracket bonded on first premolar. After 4 and 8 weeks respectively; first premolars were extracted and surface chareacteristics were evaluated using SEM. Each tooth sample was divided into middle and apical third and further into buccal, lingual, mesial and distal surfaces on each tooth. Results: Statistical significant (P < 0.001) changes were observed in middle third area using both light and heavy forces. Conclusions: Heavy forces during intrusion should be used cautiously in orthodontic biomechanics, if such procedures are to be carried out over a long period of time.


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