Photoelastic analysis of bone deformation in the region of the mandibular condyle during mastication.
BACKGROUND
The purpose of this experimental study was to demonstrate the stress patterns arising in the region of the mandibular condyle during mastication.


METHODS
Stress analysis was performed using reflection photoelasticity to demonstrate deformation occurring on the surface of the mandible. The rami of three fresh dentate human mandibles were coated with a shell of photoelastic resin. Using a novel loading device, these mandibles were then subjected to external forces (muscular traction, resultant mandibular forces and intra-articular reaction force) reproducing a unilateral biting task between the first right molars. Deformations were measured from the working side.


RESULTS
The trace of isostatic lines from the isoclinic fringes revealed major differences in stress distributions between the three mandibles. These differences were attributed to differences in shape between the three mandibles. Conversely, we consistently found compressive stress patterns along the posterior border of the ramus and tensile stress patterns along the anterior border of the ramus and in the zone situated below the siqmoid notch.


CONCLUSIONS
These findings suggest that during this particular task, the mandible is subjected to sagittal forces which tend to straighten the mandibular angle. This implies that new concepts are needed for the positioning of osteosynthesis plates in the condylar region, close to the tensile strain lines, as has been recommended also for other parts of the mandible when applying semi-rigid internal fixation.
Meyer
Christophe
C
Department of Maxillofacial Surgery, University Hospital of Strasbourg, France. christophemeyer@yahoo.com
Kahn
Jean-Luc
JL
Boutemi
Philippe
P
Wilk
Astrid
A
D001696:Biomechanical Phenomena; D002102:Cadaver; D004548:Elasticity; D004853:Epoxy Resins; D006801:Humans; D008334:Mandible / Q000502:physiology; D008335:Mandibular Condyle / Q000502:physiology*; D008406:Masseter Muscle / Q000502:physiology; D008409:Mastication / Q000502:physiology*; D008953:Models, Anatomic; D008963:Molar / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology; D055095:Optics and Photonics; D013314:Stress, Mechanical; D013704:Temporomandibular Joint / Q000502:physiology; D016474:Weight-Bearing / Q000502:physiology
D004853:Epoxy Resins