Abstract
Mandibular distraction osteogenesis is a clinical procedure used for modifying the mandibular geometry when problems of dental overcrowding and arch shrinkage occur. The objective of this study is to use a computational model of tissue differentiation to examine the influence of the rate of distraction on bone re-growth within the fracture callus of a human mandible submitted to symphyseal distraction osteogenesis. A 3D model of the mandible is reconstructed from CT scan data and meshed into finite elements. Two different mastication loadings have been investigated: a ‘full’ mastication load and a ‘reduced’ mastication load where the action of each muscle was reduced by 70%. Four different distraction rates were analyzed: 0.6, 1.2, 2, and 3 mm/day, allowing a total displacement of 6 mm. In the early stages of the distraction process it is predicted that there is a decrease in the amount of bone tissue forming within the center of the fracture gap for all distraction rates. After the initial phases of expansion, the bone tissue within the callus increases for the slower rate of distraction or continues to decrease at the faster rates of distraction. At the end of the simulated maturation period, 47% of the distracted callus was predicted to consist of bone tissue for a distraction rate of 0.6 mm/day, decreasing to 22% for a distraction rate of 3 mm/day. Significantly higher amounts of bone formation were predicted for all distraction rates for the case of reduced mastication loading. Disparities between the model predictions and what is observed in vivo were found. For instance, during the latency period, the distraction period and beyond, the model is predicting larger than expected amounts of cartilage tissue formation within the callus. This and other limitations of the proposed model are discussed and possible specific explanations for these disparities are provided in the paper. The model predicts a distraction rate of around 1.2 mm/day to be optimal as higher rates produce less bone tissue while the risk of a premature bone union is greater at slower rates of distraction because in the latter stages of the distraction process bone tissue is predicted to form between the left and right side of the bone callus.
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Appendix A
Appendix A
Evaluation of the Reaction Force Acting on the Bone Callus
The boundary and loading conditions acting on the mandibular arch may be schematized with the simplified structure S1 illustrated in Fig. A1. The domain indicated with LA represents the left arm of the mandible while the BC and RA domains represent the bone callus and the right arm respectively. The unilateral occlusion is schematized with the UO supports. We assume, for simplicity, that the UO supports prevent displacements in all three coordinate directions. (In the FE model, the constraint simulating the unilateral occlusion only prevents displacement along the 3 direction, while the other two degrees of freedom are restrained due to the elastic element simulating the temporo-mandibular joint.) Let F mL and F mR be the vertical components (which are the most significant component) of the resultant forces developed by the mastication muscles on the left and on the right side and let b be the distance of the action line of F mL force with respect to the bone callus domain; c is the thickness of the BC bone callus.
Let us suppose RA and LA to be rigid structures. This allows us to model the S1 structure as shown in structure S2. The action of the F mL force on the left side of BC is given by the same F mL force and a moment M L on the left hand side of the callus is given by: M L = F mL *b. The moment on the right hand side is given by M R = M L + F mL *c = F mL *(b + c). Therefore in general, the reaction force acting on the right side of the callus is bigger than the left side.
As is clear, the real boundary and loading conditions of the mandible are more complicated than those schematized in S1. In fact, we neglect the effect of the constraint simulating the temporo-mandibular joint and we introduce the simplification that the support modeling the unilateral occlusion prevents displacement in all the three coordinate directions. However, the hypothesis made should not affect the validity of the conclusion.
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Boccaccio, A., Pappalettere, C. & Kelly, D.J. The Influence of Expansion Rates on Mandibular Distraction Osteogenesis: A Computational Analysis. Ann Biomed Eng 35, 1940–1960 (2007). https://doi.org/10.1007/s10439-007-9367-x
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DOI: https://doi.org/10.1007/s10439-007-9367-x