Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contacts Login 
  • Users Online: 845
  • Home
  • Print this page
  • Email this page
ORIGINAL ARTICLE
Year : 2020  |  Volume : 17  |  Issue : 4  |  Page : 258-265

Comparison of strengths of five internal fixation methods used after bilateral sagittal split ramus osteotomy: An in vitro study


1 Department of Oral and Maxillofacial Surgery; Craniomaxillofacial Research Center, Islamic Azad University of Medical Sciences, Tehran, Iran
2 Private Practice, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
3 Craniomaxillofacial Research Center, Islamic Azad University of Medical Sciences, Tehran, Iran
4 Department of Mechanical Engineering, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran

Correspondence Address:
Dr. Farzin Sarkarat
#4, Neyestan 10th, Pasdaran Ave., Tehran
Iran
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1735-3327.292061

Rights and Permissions

Background: Results on the strength and displacement of internal fixation methods for bilateral sagittal split ramus osteotomy are controversial, and some designs have not been adequately studied. Therefore, this study was conducted to compare techniques using bicortical or monocortical screws. Materials and Methods: In this in vitro study, 35 sheep hemi-mandibles were randomly assigned to five groups of seven each: fixation using (1) a 13 × 2 screw, (2) two 13 × 2 screws (arranged vertically), (3) three 13 × 2 screws, (4) 1 plate with 4 holes and four monocortical screws, and (5) a Y-shaped plate and five monocortical screws. Specimens underwent vertical forces until failure. Breakage forces and displacements of groups were recorded and compared statistically. Using one-way analysis of variance (ANOVA) with a Tukey's post hoc test and Kruskal–Wallis test. Level of significance was predetermined as 0.05. Results: Strengths of Groups 1–5 were, respectively, 14.43 ± 4.35, 28.00 ± 8.89, 28.29 ± 8.01, 29.43 ± 8.24, and 61.29 ± 12.38 N, respectively (P = 0.000, analysis of variance). The corresponding displacement extents were 7.98 ± 0.04, 7.85 ± 0.26, 8.00 ± 0.00, 7.35 ± 1.73, and 6.79 ± 2.03 mm (P = 0.298, Kruskal–Wallis test). Conclusion: Use of a single bicortical screw is the weakest method, while Y-shaped plates might provide the highest strength. Using two or three bicortical screws or 4-hole plates might deliver similar strengths.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed1224    
    Printed16    
    Emailed0    
    PDF Downloaded290    
    Comments [Add]    

Recommend this journal