Die Korrelation von Oberflächenrauheitsparametern von Zirkonoxid und Lithiumdisilikat mit Steatitabrasion

The use of three-dimensional parameters may offer a better estimation for wear and an improved clinical surface treatment. The aim of the present study was to determine the influence of various surface roughness parameters of zirconia and lithium disilicate ceramics on the wear of steatite ceramic as surrogate for enamel antagonists.
Forty zirconia and 40 lithium disilicate specimens were each divided into five subgroups. Two subgroups were treated with different clinically established diamond burs, a third subgroup was treated with a silicone polishing set. Two additional subgroups were produced by glazing the surfaces after treatment. Surface roughness parameters were determined by laser scanning microscopy. All specimens underwent 1.2 million loading cycles using steatite antagonists. After regular intervals of cycles, precision impressions were made to assess wear. The correlation of wear and different roughness parameters was evaluated using the Spearman correlation test.
In the unglazed lithium disilicate groups, significant (p≤0.05) correlations with steatite substance loss could be found for several roughness parameters after 1.2 million cycles. For lithium disilicate it seems not sufficient to use only one roughness parameter to indicate the wear behavior of the surface. There was no correlation between wear and the tested roughness parameters of zirconia surfaces. The finding of influential  roughness parameters in lithium disilicate groups could help in optimizing polishing methods for the clinical routine in the future: In order to reduce tooth abrasion, polishing techniques should be oriented to reduce Ra, Rp, Rz, Rv, Rt, Sa, Sp, Spd and Sdr. In the present study the silicone polisher achieved the best results in reducing these surface roughness parameters.

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