Changes in Occlusal Contacts with Zirconia Crowns
Author Information
Author(s): Wang Yujun, Millstein Philip, Lu Korina Yun-Fan, Lee Jason D., Lee Sang J., Jaquiéry Claude, Schmidlin Patrick R.
Primary Institution: Harvard School of Dental Medicine
Hypothesis
Different cement space settings in CAD-CAM crowns impact the occlusion upon cementation.
Conclusion
Cementation increases occlusal contact surface area and intensity in both cement space groups.
Supporting Evidence
- Significant differences in occlusal contact areas were found between pre- and post-cementation in both groups.
- The mean post-cementation contact surface area for the 70 μm group was 6281 μm2, compared to 2339 μm2 before cementation.
- For the 120 μm group, the post-cementation area was 5545 μm2, compared to 2071 μm2 before cementation.
- An increase in contact intensity was also observed after cementation.
Takeaway
When dentists put crowns on teeth, the way they touch each other changes, and this study shows that using different amounts of space for the glue can make a big difference.
Methodology
The study involved creating a master model, fabricating zirconia crowns with different cement spaces, and measuring occlusal contacts before and after cementation using imaging analysis.
Limitations
The study was conducted in vitro, which may not reflect real-life conditions involving muscle dynamics and TMJ.
Statistical Information
P-Value
p < 0.001
Statistical Significance
p < 0.001
Digital Object Identifier (DOI)
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