The Three-dimensional Finite Elements Analysis Of Maxillary First Molar Being Restored By Inceram-Z All-ceramic Crowns

With the development of medical technology and the continuous improvement of people's aesthetic requirements, all-ceramic restoration techniques for its unique esthetical properties and biocompatibility have been widely used in clinic. After the all-ceramic restoration technology has been developed for many years, the scope of the anterior teeth restoration extended to the posterior teeth, from a single crown to a fixed bridge. These are related to the inventions of a variety of high-strength all-ceramic materials. The object Inceram-Z all-ceramic materials studied in this experiment which is developed by Vita company are used as all-ceramic crowns on posterior teeth and all-ceramic fixed bridge restoration. They are high-strength all-ceramic materials which are made by using glass infiltrates alumina. The technology effectively improves the strength of the materials.Many factors can affect the strength of all-ceramic crowns. Different taper abutment angle and different material of post-core must affect the stress results of all-ceramic crowns, while changes in the distribution of stress can also affect the life of all-ceramic restorations. Inceram-Z all-ceramic crown is our research object in this experiment. We use three-dimensional finite element method to build the all-ceramic crown of the maxillary first molar in order to observe the effects in all-ceramic crown and dentin. The effects are made by different taper abutment angle and different material of post-core. In a word, this study can provide a theoretical basis for optimization design of all-ceramic crown.In this experiment, we use three-dimensional finite element as research method. First, select a intact maxillary first molar in vitro. Second, scan it by the Computed Tomographic (CT) after embedding it and the pictures are saved as DICOM form. Third, utilize MIMICS and ANSYS software to set up all-ceramic crown of the maxillary first molar with different taper abutment angle and to set up the model, half of which is lost in lingual side of the maxillary first molar, with restoration of different post-core and all-ceramic crown. Then a 600N force is applied vertically downward. Finally, give the parameters of material properties and boundary conditions and carry on biomechanical analysis in order to study the stress distribution of all-ceramic crown and dentin.Results:1. In this study, we use spiral CT scans to obtain dental CT images and use MIMICS and ANSYS software to set up the model. As a result, the three-dimensional finite element model of the all-ceramic crown of the maxillary first molar was established.2. The distributing situation of the stress of dentin is similar after analyzing when the...