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The International Journal of Prosthodontics
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Int J Prosthodont 31 (2018), No. 4     3. July 2018
Int J Prosthodont 31 (2018), No. 4  (03.07.2018)

Page 397-398, doi:10.11607/ijp.5455, PubMed:29590666


Effect of Premolar Axial Wall Height on Computer-Aided Design/Computer-Assisted Manufacture Crown Retention
Martin, Curt / Harris, Ashley / DuVall, Nicholas / Wajdowicz, Michael / Roberts, Howard Wayne
Purpose: To evaluate the effect of premolar axial wall height on the retention of adhesive, full-coverage, computer-aided design/computer-assisted manufacture (CAD/CAM) restorations.
Materials and Methods: A total of 48 premolar teeth randomized into four groups (n = 12 per group) received all-ceramic CAD/CAM restorations with axial wall heights (AWH) of 3, 2, 1, and 0 mm and 16-degree total occlusal convergence (TOC). Specimens were restored with lithium disilicate material and cemented with self-adhesive resin cement. Specimens were loaded to failure after 24 hours.
Results: The 3- and 2-mm AWH specimens demonstrated significantly greater failure load. Failure analysis suggests a 2-mm minimum AWH for premolars with a TOC of 16 degrees.
Conclusion: Adhesive technology may compensate for compromised AWH.