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

Sarkarat, F ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.4103/1735-3327.292061
  3. Publisher: Wolters Kluwer Medknow Publications , 2020
  4. Abstract:
  5. 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. © 2020 Dental Research Journal | Published by Wolters Kluwer - Medknow
  6. Keywords:
  7. Bone plates ; Fracture fixation ; Internal ; Sagittal split ramus osteotomy ; Surgical fixation devices ; Animal tissue ; Equipment design ; Force ; In vitro study ; Intermethod comparison ; Mandible ; Nonhuman ; Osteosynthesis ; Post hoc analysis ; Sagittal split ramal osteotomy ; Sheep ; Strength
  8. Source: Dental Research Journal ; Volume 17, Issue 4 , 2020 , Pages 258-265
  9. URL: https://www.drjjournal.net/article.asp?issn=1735-3327;year=2020;volume=17;issue=4;spage=258;epage=265;aulast=Sarkarat