Biomechanical evaluation of hybrid fixation method of sagittal split ramus osteotomy in mandibular advancement

2018 ◽  
Vol 46 (12) ◽  
pp. 2063-2068
Author(s):  
Burcu Gursoytrak ◽  
Nurdan Unsal ◽  
Umut Demetoglu ◽  
Hasan Onur Simsek ◽  
Haci Saglam ◽  
...  
Keyword(s):  
Mandibular Advancement ◽  
Fixation Method ◽  
Hybrid Fixation ◽  
Sagittal Split Ramus Osteotomy ◽  
Biomechanical Evaluation

Biomechanical Evaluation of a New Fixation Method for Stabilization of Sagittal Split Ramus Osteotomy After Mandibular Advancement

2021 ◽  
Vol 6 ◽  
pp. 247275122110192
Author(s):  
Karel Kuik ◽  
Jean Pierre T. F. Ho ◽  
Cornelis Klop ◽  
Maurits H. T. de Ruiter ◽  
Cornelis J. Kleverlaan ◽  
...  
Keyword(s):  
Hybrid Method ◽  
In Vitro Study ◽  
Mandibular Advancement ◽  
Fixation Method ◽  
Common Procedure ◽  
Sagittal Split Ramus Osteotomy ◽  
Fixation Methods ◽  
Biomechanical Evaluation ◽  
Monocortical Screws

Study Design: Biomechanical in vitro study. Mandibular advancement after sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery. Several fixation methods are used for stabilization of SSRO. Objective: The aim of this study was to compare a new fixation method (gridplate) with more contemporary applied methods of fixation. Material and Methods: In this study, 50 polyurethane hemimandibles with a prefabricated SSRO were used as specimens. All hemimandibles were advanced by 8 mm and divided into 5 groups with different fixation methods: (A) one 4-hole miniplate with 4 monocortical screws; (B) two 4-hole miniplates with 8 monocortical screws; (C) one 4-hole miniplate with 4 monocortical screws and 1 bicortical screw in the retromolar area (hybrid method); (D) 3 bicortical screws in an inverted-L pattern; and (E) one 8-hole gridplate with 8 monocortical screws. Loads in newtons were recorded at displacements of the mandibular incisive edge at 1 mm, 3 mm and 5 mm. Results: Fixation with 3 bicortical screws and the gridplate presented the most stability, followed by two 4-hole miniplates. Fixation with the hybrid method or the single miniplate showed the least stability. Conclusion: According to the results of this study, the 8-hole gridplate design appears a sufficient fixation method regarding stabilization of SSRO with larger mandibular advancement.

scholarly journals Analysis of Mandibular Test Specimens Used to Assess a Bone Fixation System

2015 ◽  
Vol 8 (3) ◽  
pp. 171-178 ◽  
Author(s):  
LeandroStocco Baccarin ◽  
Renato Correa Viana Casarin ◽  
JorgeVicente Lopes-da-Silva ◽  
LuisAugusto Passeri
Keyword(s):  
Biomechanical Testing ◽  
Load Resistance ◽  
Fixation Method ◽  
Sagittal Split Ramus Osteotomy ◽  
Biomechanical Behavior ◽  
Synthetic Materials ◽  
Group A ◽  
Materials Used ◽  
Group B

The aim of this study was to assess through biomechanical testing if different synthetic materials used to fabricate test specimens have a different biomechanical behavior in comparison with other materials when simulating in vitro load resistance of a fixation method established for sagittal split ramus osteotomy (SSRO). Thirty synthetic and standardized human hemimandible replicas with SSRO were divided into three groups of 10 samples each. Group A—ABS plastic; Group B—polyamide; and Group C—polyurethane. These were fixated with three bicortical position screws (16 mm in length, 2.0-mm system) in an inverted L pattern using perforation guide and 5-mm advancement. Each sample was submitted to linear vertical load, and load strength values were recorded at 1, 3, 5, 7, and 10 mm of displacement. The means and standard deviation were compared using the analysis of variance ( p < 0.05) and the Tukey test. A tendency for lower values was observed in Group B in comparison with Groups A and C. At 3 and 5 mm of displacement, a difference between Groups A and C was found in comparison with Group B ( p < 0.05). At 7 and 10 mm of displacement, a difference was found among the three groups, in which Group C showed the highest values and Group B the lowest ( p < 0.05). Taking into consideration the results obtained and the behavior of each material used as a substrate, significant differences occurred among the materials when compared among them.

scholarly journals Surgical Orthodontic Treatment of Severe Skeletal Class II

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Fahad F. Alsulaimani ◽  
Maisa O. Al-Sebaei ◽  
Ahmed R. Afify
Keyword(s):  
Orthodontic Treatment ◽  
Anterior Segment ◽  
Class Ii ◽  
Mandibular Advancement ◽  
Sagittal Split Ramus Osteotomy ◽  
Skeletal Class ◽  
Maxillary Osteotomy ◽  
Skeletal Class Ii ◽  
Segment 8 ◽  
Jaw Surgery

This paper describes an adult Saudi male patient who presented with a severe skeletal class II deformity. The case was managed with a combination of presurgical orthodontic treatment followed by a double jaw orthognathic surgery and then another phase of orthodontic treatment for final occlusal detailing. Extraction of the four first premolars was done during the presurgical orthodontic phase of treatment to decompensate upper and lower incisors and to give room for surgical setback of the maxillary anterior segment. Double jaw surgery was performed: bilateral sagittal split ramus osteotomy for 8 mm mandibular advancement combined with three-piece Le Fort I maxillary osteotomy, 6 mm setback of the anterior segment, 8 mm impaction of the maxilla, and 5 mm advancement genioplasty. Although the anteroposterior discrepancy and the facial convexity were so severe, highly acceptable results were obtained, both esthetically as well as occlusally.

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