Journal of Prosthodontics News
Fracture Resistance of Cement-Retained Lithium Disilicate Implant-Supported Crowns
Now online in the Journal of Prosthodontics, a study investigating the fracture resistance of cement-retained lithium disilicate implant-supported crowns. This study was co-authored by ACP members Jekita Kaenploy, DDS, MS, Rui Li, DDS, PhD, and Ramtin Sadid-Zadeh DDS, MS. Dr. Kaenploy presented this research as a finalist in the John J. Sharry Prosthodontic Research Competition held during the 2023 Annual Session of the ACP in San Diego.
This study compared the fracture strength of single lithium disilicate implant-supported crowns fabricated on two-piece abutments with various materials: ceramic-reinforced PEEK, zirconia, and lithium disilicate.
Thirty-six implants were embedded in acrylic cylinders. A two-piece abutment and a crown were designed for a maxillary left central incisor. From those designs, 36 lithium disilicate crowns were fabricated and 36 abutments were manufactured from 3 materials, 12 each: zirconia; lithium disilicate; and ceramic-reinforced PEEK.
Abutments were surface treated and bonded on the titanium base abutments with resin cement. Then, lithium disilicate crowns were bonded on the assigned abutments. Specimens were then subjected to dynamic loading for 1,200,000 cycles and the fracture strength of the assembly was assessed.
The results showed that the lithium disilicate group had significantly higher fracture strength than the group with PEEK; however, there was no significant difference between the other groups. None of the specimens had failures after fatigue loading, which simulated 5 years of clinical use. Two-piece abutments fabricated from lithium disilicate, PEEK, and zirconia, with lithium disilicate crowns may be used to restore an implant in the anterior region.
Kaenploy J, Li R, Makowka S, Sadid-Zadeh R. Fracture resistance of cement-retained lithium disilicate implant-supported crowns: Effect of material used for two-piece abutments. J Prosthodont. 2024; 1–7. https://doi.org/10.1111/jopr.13871
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