The effect of agglomerant thickness on the stress distribution of all ceramic crown of central incisor / 实用口腔医学杂志

ABSTRACT

Objective: To study the effect of the stress distribution with three dimensional(3-D) finite element analysis technique between zirconia all-ceramic crown of maxillary central incisors and agglomerant with different thickness. Methods: A 3-D finite element model of all-ceramic crown (core layer and the veneer layer), agglomerant, tooth, tooth root and alveolar bone was established from CBCT data. The agglomerant thickness was designe as 50, 100 and 150 μm respectively. After a load simulating occlusion was imposed on to the model the stress distribution of agglomerant layer, the equivalent of veneer layer and the maximum principal stress were analysed. Results: With the increase of agglomerant thickness and the change of occlusion, the maximum principal stress of all ceramic crowns gradually increased, the equivalent stress increased first and then decreased, the equivalent stress and the maximum principal stress of agglomerant layer showed a downward trend. Conclusion: The use of agglomerant layer with the thickness of 50 μm is feasible for the bond of all ceramic crowns and may reduce the risk of veneer chipping.