The dentist's preoccupation concerning the phonetic rehabilitation of the edentulous patient emanates from the practical findings about the consonant alteration during the speech process. The aim of this study was to assess the phonetic alterations in complete denture wearers caused by position, size and material (resin or ceramics) of the frontal artificial teeth. This was performed using the static palatographies and spectrograms, which evaluated the most important spaces for the phonetic modulation, in relation to various settings of the artificial teeth
Several studies evaluated the removable partial dentures by the finite element analysis,
but none of them evaluated thermal stresses. The purpose of the study was to explore the influence
of thermal oral changes induced by hot/cold liquids and food on the circumferential cast clasps of
removable partial dentures. A 3-dimensional finite element method was used to explore the
temperature distribution, thermal stress and the influence of thermal changes on stresses and
displacements of circumferential clasps during functions. Thermal variations induce stresses in
dental clasps, high temperatures having a more aggressive effect than lower one. Cold liquids and
food induce high stresses in the retentive clasp arms while hot ones in the occlusal rests of the
clasps and for the back action clasp also in the minor connector. The study suggests the importance
of consFigureidering thermal variations for stress analyses of the cast clasps.
Two parameters strongly influences the mechanical behavior of endodontically treated teeth restored with posts: the design and the rigidity of the materials. The aim of the present study was to evaluate the influence of the root preparation taper and crown materials on dowel and core restored upper central incisor. In order to obtain relevant FEA results, particular attention was given to an accurate computer reconstruction of a tooth. Round canal shapes with different tapers were modeled for the dowel, to allow the design of the cast metallic dowel-and-core 3D models. All the restorations were simulated to be covered by all-ceramic and metal-ceramic crowns. A three-dimensional finite element analysis was performed. Von Mises equivalent stresses were calculated. Areas vulnerable to damage were located in the cervical parts of the restorations. Within the limitations of the present study, it was found that the crown material is important for the stress values.
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