Numerous studies have evaluated the stress analysis.
Generally, we have used electrical resistance strain gages, brittle-coating, Moir´s fringe analysis, photoelasticity and finite element method in stress analysis method. The finite element method is an accepted theoretical technique used in the solution of engineering problems. This method has also been used for biomechanical analysis in orthopedic, cardiovascular and dental structure. We presented 3-dimensional stress analysis of various rigid fixation mathod under accusal force after SSRO with finite element method.
Rigid fixation mathods
1) Miniplate
2) Type I : transbuccal approach (reverse L type)
3) Type II : intraoral approach (reverse L type)
4) Type III : intraoral approach (all screw above mandibular canal)
Occlusal force
1) Protrusive occlusion : force applied on incisor, canine and premolar area
2) Centric occlusion : force applied on premolar and molar area
The results were as follows.
1. In screw fixation methods research, the total stress must appear in Type I screw fixation method in protrusive occlusion, and in centric occlusion the Type III screw fixation method shows the most total stress.
2. Among screw fixation methods, Type III screw fixation method works best for stress distribution in protrusive occlusion, and Type I screw fixation method disrtibutes in centric occlusion better than other types.
3. In screw fixation methods research, the side of C screw in Type II and III screw fixation methods results in considerable stress concentration in centric occrusion.
4. In miniplate screw fixation method research, stress was concentrated in middle and posterior part but there was almost no stress in anterior part.
5. In protrusive occlusion, tension stress appeared in the middle part of the miniplate but in centric occlusion, compression stress occured in same place.
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