António Ramos1, Luis M Gonzalez-Perez2, Pedro Infante-Cossio3, Michel Mesnard4. 1. University of Aveiro, Biomechanics Research Group, Department of Mechanical Engineering, 3810-193 Aveiro, Portugal. Electronic address: a.ramos@ua.pt. 2. Department of Maxillofacial Surgery, Virgen Del Rocio University Hospital, Av. Manuel Siurot s/n, Seville 41013, Spain. 3. Department of Surgery, School of Medicine, University of Seville, Dr. Fedriani Av., Seville 41009, Spain. 4. University of Bordeaux, Institut de Mécanique et d'Ingénierie, CNRS UMR 5295, FR-33405 Talence, France.
Abstract
PURPOSE: The purpose of this study is to pre-validate an inovative implant concept, and to compare the behavior of the mandibular condyle against a commercial Biomet implant in an ex vivo model and present results of the first cadaveric studies. MATERIALS AND METHODS: Three experimental cadaveric condyles were tested under three conditions: one intact, another with the Biomet model, and one with the innovative concept. The condyle was tested with a reaction of 300 N in all situations and the principal strains were measured. Before the geometry of the cadaveric condyle was reconstructed from a microCT scan, and a finite element model was created. Finally, a procedure was carried out with the new implant by two expert surgeons on a two cadaveric head model. RESULTS: In vitro the mandible condyle presents a linear behavior until maximum load. The strain measured with Biomet implant indicates a strain shielding effect in the proximal region, inducing bone loss in the long term. The lingual side of the Biomet implanted condyle presents an increase of +44% in strain. CONCLUSION: The new concept was evaluated and showed a similar behavior to the intact model, and better behavior than the Biomet. The innovative concept proves that it is possible to avoid screws for a TMJ fixation and improve the TMJ alloplastic behavior.
PURPOSE: The purpose of this study is to pre-validate an inovative implant concept, and to compare the behavior of the mandibular condyle against a commercial Biomet implant in an ex vivo model and present results of the first cadaveric studies. MATERIALS AND METHODS: Three experimental cadaveric condyles were tested under three conditions: one intact, another with the Biomet model, and one with the innovative concept. The condyle was tested with a reaction of 300 N in all situations and the principal strains were measured. Before the geometry of the cadaveric condyle was reconstructed from a microCT scan, and a finite element model was created. Finally, a procedure was carried out with the new implant by two expert surgeons on a two cadaveric head model. RESULTS: In vitro the mandible condyle presents a linear behavior until maximum load. The strain measured with Biomet implant indicates a strain shielding effect in the proximal region, inducing bone loss in the long term. The lingual side of the Biomet implanted condyle presents an increase of +44% in strain. CONCLUSION: The new concept was evaluated and showed a similar behavior to the intact model, and better behavior than the Biomet. The innovative concept proves that it is possible to avoid screws for a TMJ fixation and improve the TMJ alloplastic behavior.
Authors: Bram Barteld Jan Merema; Joep Kraeima; Haye H Glas; Fred K L Spijkervet; Max J H Witjes Journal: Oral Dis Date: 2020-07-09 Impact factor: 3.511