Tesis doctoral de Ana Carla Vilas Boas
Keywords: biomechanics, biomechanical model, maxilla, masticatory muscles, occlusal loads, strain gauges, transducer development of analytical models of occlusal loading of the facial skeleton is of considerable importance for prosthetic design in oral rehabilitation. a biomechanical model was constructed using three human skulls to analyse strain and stress distribution in the facial skeleton caused by simulated occlusal loading. the insertions of the masseter, temporal and lateral pterygoid muscles were simulated with orthodontics elastic chains bonded to the appropriate areas in the maxilla. The following loading conditions were used: all three muscles were bilaterally loaded while occlusal loads were simultaneously applied on the maxillary teeth. a transducer was used to simulate and control the masticatory loads. Each skull was measured applying vertical loads on the transducer in three different single point occlusal (central incisors, first upper right molar and first upper left molar) sites and with two different loads (250g and 500g) simulated by the chains. an experimental technique using 19 bonded strain gauges sited on strategic points was used to get the resulting stress patterns in a model. The stress trajectories were observed and analyzed considering the different morphology between skulls and comparing the equations of static equilibrium, symmetry, repeatability and linearity of the results. it was possible to establish an experimental model to simulate and analyse the mechanical loads in the superior maxilla due to the action of the masticatory muscles. The simulated muscles and the occlusal loads produced stresses which were measured in all the strain gauges and progressed through the maxilla, following a nasal, zygomatic and pterygoid route, while stress concentrations were higher on incisor-canine area. overall the skulls present a very similar pattern of stress distribution and strains, locally differences are explained by the morphological variations. our study confirms the theory developed by sicher and du brul, that the pillars are architectural reinforcement structures generated by occlusal forces. the biomechanical simulation of the zygomatic-maxillary structure is more complex than in the mandible as a result of several unidentified active forces and composite anatomy. this study can be used as a foundation for future studies based on mathematical modelling and to validate existing studies.
Datos académicos de la tesis doctoral «Biomecánica del maxilar superior«
- Título de la tesis: Biomecánica del maxilar superior
- Autor: Ana Carla Vilas Boas
- Universidad: Barcelona
- Fecha de lectura de la tesis: 03/07/2009
Dirección y tribunal
- Director de la tesis
- Tomás Escuin Henar
- Tribunal
- Presidente del tribunal: josep María Ustrell torrent
- horacio Urgel silva monteiro (vocal)
- (vocal)
- (vocal)