IADR Abstract Archives
In-vitro Wear Performance of Substructure Ceramics with Different Surface Treatments
Methods: Two-body wear tests were performed in a chewing simulator with steatite antagonists. A pin-on-block design with a vertical load of 50N for 1.2x105 cycles (f=1.6Hz; lateral movement: 1mm, mouth opening: 2mm) under simultaneous thermocycling (5/55°C, 600 cycles) was used for the wear assay. Four different ceramics (manufacturers: DeguDent, G; Ivoclar-Vivadent, FL; 3M Espe, USA) were investigated, including lithiumdisilicate, experimental shaded and highly translucent zirconia materials. Specimens (n=8/group) were prepared with different surface treatments (polishing, grinding, repolishing, glazing). Human enamel specimens were used as reference. Surface roughness Ra(SP6, Perthen-Feinprüf, G), wear depth (Laserscan 3D, Willytec, G) of the specimens and wear area (light-microscope M420, Wild, CH) of the antagonists were determined. SEM (Quanta FEG 400, FEI, NL) pictures were used for evaluating wear performance of both, ceramics and antagonists. Statistics: one-way ANOVA (α=0.05).
Results:
Material |
Specimen: relative wear depth/ enamel(274.14µm)=1 |
Steatite antagonist: relative wear area/ enamel(1.25mm2)=1 |
Ra [µm] |
IPS e.max CAD full-contour |
|
|
|
polished |
0.48±0.19 |
1.87±0.56 |
0.24±0.10 |
polished-grinded |
0.56±0.12 |
2.28±0.42 |
1.55±0.23 |
polished-grinded-repolished |
0.50±0.15 |
1.79±0.62 |
0.26±0.32 |
glazed |
0.58±0.13 |
2.18±0.64 |
0.20±0.17 |
Cercon HT |
|
|
|
polished |
0.00±0.00 |
1.40±0.50 |
0.06±0.03 |
polished-grinded |
0.00±0.00 |
1.36±0.28 |
1.18±0.19 |
polished-grinded-repolished |
0.00±0.00 |
0.84±0.13 |
0.06 ±0.04 |
glazed |
0.21±0.04 |
1.45±0.20 |
0.15 ±0.14 |
Lava |
|
|
|
polished |
0.00±0.00 |
1.19±0.16 |
0.20±0.08 |
polished-grinded |
0.00±0.00 |
1.90±0.29 |
0.85±0.12 |
polished-grinded-repolished |
0.00±0.00 |
1.24±0.22 |
0.12±0.05 |
experimental shaded zirconia |
|
|
|
polished |
0.00±0.00 |
1.32±0.15 |
0.51±0.16 |
polished-grinded |
0.00±0.00 |
1.57±0.35 |
0.96±0.15 |
polished-grinded-repolished |
0.00±0.00 |
1.04±0.14 |
0.16±0.08 |
glazed |
0.15±0.03 |
1.41±0.11 |
0.20±0.09 |
Conclusions: Wear tests revealed no measurable wear on unglazed zirconia surfaces. Lithiumdisilicate ceramic showed significantly higher wear than zirconia, irrespective of the surface treatment. Antagonistic wear against zirconia was found to be lower than against glass ceramic. Results indicated a dependence of ceramic and antagonistic wear from the surface treatment.