Stress Distribution in Mandible and Temporomandibular Joint by Mandibular Distraction: A 3-Dimensional Finite-element Analysis

Abstract

The effects of mandibular distraction on the mandible and its surrounding tissue remain to be clarified. Here, we used a 3-dimensional finite-element method to investigate the effects of unilateral horizontal lengthening of the mandibular body and vertical lengthening of the mandibular ramus on the mandible and temporomandibular joint (TMJ). With horizontal loading that assumed mandibular body lengthening, tensile and compressive stresses were great near the anterior region of the mandibular angle (the loading area). With vertical loading that assumed mandibular ramus lengthening, tensile and compressive stresses were great at the center of the mandibular ramus (the loading area). Under both loading conditions, stress distribution in the TMJ was greater on the loading side than on the non-loading side. With mandibular body lengthening, the center of the mandible deviated in the direction of the non-lengthened side to widen the mandible in the lateral direction. With mandibular ramus lengthening, the occlusal plane tilted in the inferior direction on the lengthened side. In the TMJ, stress was greatest on the affected side during mandibular ramus lengthening, suggesting the need to consider the mandibular condyle on the affected side during this procedure.

Biomechanical Effects of Different Load Cases with an Implant-Supported Full Bridge on Four Implants in an Edentulous Mandible: A Three-Dimensional Finite Element Analysis (3D-FEA)

“…As seen on the stress distribution maps, noted stress values were peak values denoted at a specific position, however, in reality, these maximum stresses occur as a load transmitted at the bone-implant interface, not at a single point [47]. Although comparisons may be hindered by the different model characteristics set by researchers, our results have yielded similar tensile and compressive values in the same order to other previously published reports assessing stresses on mandibular bone tissue [4,21,36,37,46,[48][49][50]. The mandibular bone adapts to its loading and responds to stresses by bone formation or resorption, i.e., neither unloaded nor overloaded areas are desirable due to long-term consequences [51].…”

“…This study herein evaluated the biomechanical effects of different occlusion/load cases and implant-denture material properties in an edentulous mandible (constructed using authentic CT scans of a patient) with an implant-supported full bridge on four implants. Due to the bone's elastic material properties, tensile and compressive stress values were deemed appropriate to evaluate biomechanical properties in this study [46]. Based on the results of the analyses, the LC1 modeled-where masticatory forces covered the entire surface of the denture, including the cantilever-was noted as the safest option, confirming our initial hypotheses.…”

Does the flatting of the curve of spee affect the chewing force distribution in the mandible? (3D finite element study)

“…The previous authorized methods were used to create our 3D model. [ 29 30 ] All the linear measurements were taken using a Mitutoyo electronic caliper from the selected mandible. The periodontal ligaments were excluded in this study, because of the difficulties in mechanical modeling as well as the complexity of its mesh mathematical calculations.…”

Comparison of straight mini-plates vs. trapezoidal plates for internal fixation in condylar fractures: a systematic review

“…With the development of better diagnostic and surgical tools, surgical management has become more preferable in the treatment of condylar fractures in current days compared with those of the 20 th century, emphasizing the recognized complexity of fractures in the region [36]. Therefore, it is important to utilize a fixation tool that can adequately adapt to anatomical and functional properties of the region, and resist ten sions, compressions, bending, or shearing upon loading, ensuring better clinical outcomes postsurgery [7,8].…”