Dynamic studies of luting cement layer on full cast crown
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This study was undertaken to elucidate the dynamic behavior of the cement layers of the full cast crowns under the following conditions: 1) four marginal designs 2) two material properties of the cement. Stress distribution and the three values at the margin of the cement layer were analyzed using the three-dimensional finite element model.
When the model crown was vertically loaded, compression tended to decrease on the crown and there was no high stress concentration at any site.
When the crown model was obliquely loaded, compression tended to decrease at the margin of the crown on the side of the loading, and there was floating of the margin of the crown and a marked tensile stress concentration on the non-loaded side.
The range of tensile stress values varied with the marginal designs of the abutment tooth.
The stress values were only slightly affected by the material properties of the cement. These results suggest that the stress values of the cement layer at the tooth margin are influenced by differences in marginal designs of the abutment tooth, rather than differences in material properties of the cement.
Key wordsFull cast crown Luting cement layer Finite element method Stress analysis Structural design Marginal design
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