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Journal of the Medical Association of Thailand

8/1/2017

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Poonsak Pisek, Somchai Sessirisombat and Bunyong Rungroungdouyboon, "Biomechanical Evaluation of the Maxilla during Maxillary Distraction Osteogenessis with the New Hybrid Distraction Device: ​A Finite Element Analysis", Journal of the Medical Association of Thailand, V. 100, N. 8, August 2017, p s16-s23.
​Background: Patients with cleft lip and palate (CLP), who have malocclusion combined with severe skeletal Class III problems, usually have multidimensional maxillary hypoplasia. The present study invented a new hybrid distraction device to correct severe skeletal problems.
Objective: To evaluate biomechanical of a new hybrid distractor device during maxillary sagittal distraction osteogenesis.
Material and Method: Three-dimensional finite element skull models of a 20-year-old, non-syndromic male patient with bilateral complete cleft lip and palate was constructed. Stress distributions and displacement of the new hybrid distractor were analyzed using ANSYS v.10.0.
Results: The maximum stress levels were observed for both external and internal components of the new hybrid distractor device. The values of maximum stress were not exceeding yield stress and the range of safety factor was 2.36 to 3.76. The maxilla bone was in equilibrium balance between action force and reaction force and showed symmetrical displacement.
Conclusion: The new hybrid distractor device has enough strength during maxillary distraction osteogenesis and can provide controlled symmetrical displacement of the maxilla.
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