A Busato1, G Balconi2, V Vismara1, L Bertelè3, G Garo4, D DE Gregorio5. 1. Medica Libra, Milano, Italy. 2. Department of Radiology, Hospital San Raffaele Turro, Milano, Italy. 3. Fondazione Apostolo, Merate, Italy. 4. President and Founder of Siach - The International Society of Surgical Anatomy. 5. Director of Siach, Aesthetic Surgeon, Perugia, Italy.
Abstract
PURPOSE: The objective of the following study is to observe the behavior of the six layers of the masseter during an isometric contraction at maximum exertion with the deformation pattern analysis method. MATERIALS AND METHODS: This study has been conducted by use of an ultrasound machine (MicrUs ext-1H Telemed Medical Systems Milano) and a linear probe (L12-5l40S-3 5-12 MHz 40 mm) which allowed us to record a video (DCM) comprised of 45 frames per second. The probe was fixed to a brace and the patient was asked to clench their teeth as hard as possible, obtain the muscle's maximum exertion, for 5 seconds three times, with 30 seconds intervals in between. Both right and left masseter muscles were analyzed. Then we applied to the resulting video a software (Mudy 1.7.7.2 AMID Sulmona Italy) for the analysis of muscle deformation patterns (contraction, dilatation, cross-plane, vertical strain, horizontal strain, vertical shear, horizontal shear, horizontal displacement, vertical displacement). The number of videos of masseter muscles in contraction at maximum exertion due to dental clenching made during this research is around 12,000. Out of these we chose 1,200 videos which examine 200 patients (100 females, 100 males). RESULTS: The analysis of the deformation patterns of the masseter allows us to observe how the six layers of the muscle have different and specific functions each, which vary depending on the applied force (application point, magnitude and direction) so that we find it impossible to assign to one of the three sections of the muscle a mechanical predominance. Therefore it appears that the three parts of the muscle have specific and synergistic tasks.
PURPOSE: The objective of the following study is to observe the behavior of the six layers of the masseter during an isometric contraction at maximum exertion with the deformation pattern analysis method. MATERIALS AND METHODS: This study has been conducted by use of an ultrasound machine (MicrUs ext-1H Telemed Medical Systems Milano) and a linear probe (L12-5l40S-3 5-12 MHz 40 mm) which allowed us to record a video (DCM) comprised of 45 frames per second. The probe was fixed to a brace and the patient was asked to clench their teeth as hard as possible, obtain the muscle's maximum exertion, for 5 seconds three times, with 30 seconds intervals in between. Both right and left masseter muscles were analyzed. Then we applied to the resulting video a software (Mudy 1.7.7.2 AMID Sulmona Italy) for the analysis of muscle deformation patterns (contraction, dilatation, cross-plane, vertical strain, horizontal strain, vertical shear, horizontal shear, horizontal displacement, vertical displacement). The number of videos of masseter muscles in contraction at maximum exertion due to dental clenching made during this research is around 12,000. Out of these we chose 1,200 videos which examine 200 patients (100 females, 100 males). RESULTS: The analysis of the deformation patterns of the masseter allows us to observe how the six layers of the muscle have different and specific functions each, which vary depending on the applied force (application point, magnitude and direction) so that we find it impossible to assign to one of the three sections of the muscle a mechanical predominance. Therefore it appears that the three parts of the muscle have specific and synergistic tasks.
Authors: Gianni Pedrizzetti; Elisabeth Kraigher-Krainer; Alessio De Luca; Giuseppe Caracciolo; Jan O Mangual; Amil Shah; Loira Toncelli; Federico Domenichini; Giovanni Tonti; Giorgio Galanti; Partho P Sengupta; Jagat Narula; Scott Solomon Journal: Phys Rev Lett Date: 2012-07-26 Impact factor: 9.161
Authors: Michael Peolsson; Tommy Löfstedt; Susanna Vogt; Hans Stenlund; Anton Arndt; Johan Trygg Journal: BMC Med Imaging Date: 2010-05-21 Impact factor: 1.930
Authors: A Scarano; F Carinci; A Quaranta; D Di Iorio; B Assenza; A Piattelli Journal: Int J Immunopathol Pharmacol Date: 2007 Jan-Mar Impact factor: 3.219