Biomechanical evaluation of hybrid fixation method of sagittal split ramus osteotomy in mandibular advancement
Burcu Gursoytrak1, Nurdan Unsal2, Umut Demetoglu1
1Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Adnan Menderes University, Aydin, Turkey.
Purpose:
In this study, eight different fixation methods applied after sagittal split ramus osteotomy (SSRO) were compared experimentally.
Materials And Methods:
SSRO was performed to 48 sheep hemimandibles in eight groups of 6 each. Group A- a four hole standard miniplate; Group B- a four hole standard miniplate and one bicortical screw; Group C-a four hole locking plate; Group D-a four hole locking plate and one bicortical screw; Group E-a six hole straight miniplate; Group F-a six hole straight miniplate and one bicortical screw; Group G- a sliding plate, which was specifically designed for SSRO; Group H- sliding plate and one bicortical screw.
Results:
In terms of measured values of displacement, the highest degrees of displacement were observed in decreasing order in Groups G, C, A, and E. The least displacement values were detected in Groups H, F, D and B with values being very close to each other. For linear force applied up to 70N, 3 mm or higher displacement values were not seen in any fixation system.
Conclusion:
According to the results of study, all systems are suitable for clinic usage. However, intermaxillary fixation or functional elastics may be needed for sliding plate systems during the healing period of hard tissue.
Related Concept Videos
00:56Extraction: Advanced Methods
02:29Hybrid Zones
03:24Hybridization of Atomic Orbitals I
01:03Fixation and Sectioning
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
03:35Hybridization of Atomic Orbitals II
01:13¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...