Mechanical Simulation Analysis Of All-ceramic Crowns Based On Three-dimensional Finite Element

All-ceramic restorations shows favorable biocompatibility，esthetic attribute andtranslucency. More and more dentists and patients draw attention to ceramic crowns. Butone of it’s defects is lower strength and higher brittleness. It cannot achieve a satisfiedoutcome in the clinical practice when oral prosthesis is under maximal biting force andcyclic biting force. In actual clinical cases, the restoration is not only required to havesufficient strength and aesthetics, the fatigue resistance and its long-term performance mustbe able to meet the requirements. As the former clinical conditions are not uniform, theversatility of results is very poor. Finite element method can not only avoid these problems,but also can analyze the data and parameters that can not directly be estimated and acquiredpreviously. So the finite element method has gradually become an effective way to studythe performance of dental prosthesis.On the basic of consulting a large number of literature and studying the failuremechanism of all-ceramic restorations, a mandibular three-dimensional all-ceramic crownanalysis model of mandibular first molar is established by using PTS-3DOEthree-dimensional scanning system, combined with Geomagic Studio2012and finiteelement analysis software ANSYS12.1.The research calculated the reliability of ceramic crown in different oral circumstancessuch as changes of temperature and the maximal force of mastication. Whether all-ceramiccrown material properties can meet the requirement and high stress areas of the all-ceramiccrown is determined. At the same time, the effect of all-ceramic restorations under maximalstatic and cyclic loading stress is compared.Factors of oral temperature that can cause stress changes on all-ceramic crownrestorations are considered. The temperature conditions that previous experimental studiesoften ignore are introduced to calculate the stress of all-ceramic crown restoration. Thispaper discusses the effect of change in temperature and stress on all-ceramic crownrestoration.In addition, fatigue analysis has been conducted for all-ceramic restorations and theprediction of fatigue life has been made. This paper searched the factors that may cause thefracture failure and explored possible reasons for the gap between actual clinical data and software simulation.In the end, factors that have an impact on the life of all-ceramic crown restorations isexplored. The effect of elastic modulus, Poisson’s value and Cusp inclination on the stressof all-ceramic crowns is analyzed, too.