Advertisement

Biomechanics of the weakened mandible: use of image correlation analysis

Published:August 20, 2012DOI:https://doi.org/10.1016/j.bjoms.2012.04.266

      Abstract

      Uninterrupted resection of mandibular bone is often necessary during maxillofacial operations for cancer. This weakens the mandible, and increases the risk of fracture. To our knowledge no biomechanical analysis has been made of deformations and strains that occur during chewing if this happens, so we have made such an analysis of the weakened mandible using a new technique: image correlation. Five fresh explanted human mandibles were prepared with black and white lacquer, and placed in a loading device that allowed replication of a physiological biting exercise. Calibrated pieces of bone were resected from the right body of each mandible. Images of the mandibular surface were recorded by 2 cameras and analysed with an algorithm to correlate them, which allowed us to confirm the distribution of strain on the body of the mandible, and to focus on the weak points. Before the bone was resected, we noted tensile strains on the alveolar border of the body, and compressive strains on the basilar border. The intensity of the strains in the posterior angle of the resected bony area then increased, with reduction in the height of the bone until fracture. The orientation of the fracture line started at the lower posterior angle of the resection area and spread in a lower posterior direction until it reached the basilar border of the mandible. Image correlation is a new technique for the study of mandibular biomechanics that provides accurate measurements on a wide bony surface with high definition images and without modification of the structure. Its application to weakened mandible provided reliable images of modifications to strains during simulated biting exercises.

      Keywords

      To read this article in full you will need to make a payment

      Purchase one-time access:

      Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
      One-time access price info
      • For academic or personal research use, select 'Academic and Personal'
      • For corporate R&D use, select 'Corporate R&D Professionals'

      Subscribe:

      Subscribe to British Journal of Oral and Maxillofacial Surgery
      Already a print subscriber? Claim online access
      Already an online subscriber? Sign in
      Institutional Access: Sign in to ScienceDirect

      References

        • Meyer C.
        • Kahn J.L.
        • Boutemi P.
        • Wilk A.
        Photoelastic analysis of bone deformation in the region of the mandibular condyle during mastication.
        J Craniomaxillofac Surg. 2002; 30: 160-169
        • Yachouh J.
        • Frison L.
        • Goudot P.
        Validating a loading protocol for weakened mandibular models.
        Rev Stomatol Chir Maxillofac. 2010; 111 (in French): 123-127
        • Hagberg C.
        Electromyography and bite force studies of muscular function and dysfunction in masticatory muscles.
        Swed Dent J Suppl. 1986; 37: 1-64
        • Pruim G.J.
        • de Jongh H.J.
        • ten Bosch J.J.
        Forces acting on the mandible during bilateral static bite at different bite force levels.
        J Biomech. 1980; 13: 755-763
        • Osborn J.W.
        Features of human jaw design which maximize the bite force.
        J Biomech. 1996; 29: 589-595
        • Carlsoo S.
        Nervous coordination and mechanical function of the mandibular elevators; and electromyographic study of the activity, and an anatomic analysis of the mechanics of the muscles.
        Acta Odontol Scand Suppl. 1952; 10: 1-132
        • Meyer C.
        • Kahn J.L.
        • Boutemy P.
        • Wilk A.
        Determination of the external forces applied to the mandible during various static chewing tasks.
        J Craniomaxillofac Surg. 1998; 26: 331-341
        • Yachouh J.
        • Domergue S.
        • Loosli Y.
        • Goudot P.
        Correlation of images: technique for mandible biomechanics analysis.
        J Craniofac Surg. 2011; 22: 1893-1897
        • Saifuddin M.
        • Miyamoto K.
        • Ueda H.M.
        • Shikata N.
        • Tanne K.
        A quantitative electromyographic analysis of masticatory muscle activity in usual daily life.
        Oral Dis. 2001; 7: 94-100
        • Calderale P.M.
        • Fasolio G.
        • Mongini F.
        Experimental analysis of strains influencing mandibular remodelling.
        Acta Orthop Belg. 1980; 46: 601-610
        • Kuppers K.
        Analysis of the functional structure of the human jaw.
        Ergeb Anat Entwicklungsgesch. 1971; 44 (in German): 3-90
        • Usui T.
        • Maki K.
        • Toki Y.
        Measurement of mechanical strain on mandibular surface with mastication robot: influence of muscle loading direction and magnitude.
        Orthod Craniofac Res. 2003; 6 (163–7, 79–82)
        • Junier N.
        • Spiessl B.
        A mechanical carrier for the functional load of the mandible.
        Rev Stomatol Chir Maxillofac. 1981; 82 (author's translation, in French): 265-272