![]() Conclusion: Tribochemical silica coating and silica nanofilm deposition on the inner surface of zirconia crowns promoted a higher retentive strength. The TBS and GHF15 groups, respectively, had 60% and 70% of their failures classified as 50C, while most of the other groups had 50S failures. There was no difference in Weibull modulus, except for the GHF1 group (lower values). Results: The TBS (5.661.7 MPa) and NANO groups (5.561 MPa) had higher retentive strength than the other groups (p,0.0001) and had the highest values of characteristic strength. Failures were classified as 50C (above 50% of cement in the crown) and 50S (above 50% of cement on the substrate). The retention data (MPa) were analyzed using one-way analysis of variance, Tukey tests, and Weibull analysis. The crowns were cemented with resin cement, thermocycled (12,000 cycles 58C/558C), stored for 60 days, and subjected to a retentive strength test (0.5 mm/min until failure). The surfaces of the preparations (polymer) were conditioned with 10% HF for 30 seconds and silanized. All groups received a silane application. GHF15 = glaze application HF for 15 minutes NANO = silica nanofilm deposition (5 nm) via magnetron sputtering. Crown/preparation assemblies were randomly allocated into five groups (n=20) according to the treatment of the intaglio surfaces: TBS = tribochemical silica coating via air-abrasion with 30-lm silica-coated alumina particles GHF1 = application of thin glaze layer hydrofluoric acid (HF) etching for 1 minute GHF5 = glaze application HF for 5 minutes Paolo Baldissara, DDS, assistant professor and researcher, Biomedical Sciences and Neuromotor (Prosthetic Dentistry Unit), Alma Mater Studiorum University of Bologna, Bologna, Italy Roberto Scotti, professor, Biomedical Sciences and Neuromotor (Prosthodontics), Alma Mater Studiorum University of Bologna, Bologna, Italy *Luiz Felipe Valandro, DDS, MSD, PhD, associate professor, Restorative Dentistry (Prosthetic Dentistry Unit), Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil *Corresponding author: Luiz Felipe Valandro, PhD, R. Polymer material were scanned, and 100 Y-TZP crowns with occlusal retentions were milled. Callegari, PhD, Physics Department, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil Dorneles, PhD, associate professor, Physics Department, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil Gustavo L. Wandscher, DDS, MSD, PhD, adjucnt professor, Faculty of Odontology (Prosthetic Dentistry Unit), Franciscan University Center, Santa Maria, Rio Grande do Sul State, Brazil Catina Prochnow, DDS, MSD, PhD student, Post-graduate Program in Oral Science (Prosthetic Dentistry Unit), Federal University of Santa Maria, Santa Maria, Brazil Marilia Pivetta Rippe, DDS, MSD, PhD, adjunct professor, Restorative Dentistry (Prosthetic Dentistry Unit), Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil Lucio S. Methods: One hundred simplified full-crown preparations produced from fiber-reinforced Vinicius F. ![]() SUMMARY Objective: To evaluate the effect of different methods of silica deposition on the intaglio surface of yttrium oxide stabilized zirconia polycrystal (Y-TZP) crowns on the retentive strength of the crowns. Retentive Strength of Y-TZP Crowns: Comparison of Different Silica Coating Methods on the Intaglio Surfaces VF Wandscher C Prochnow MP Rippe LS Dorneles GL Callegari P Baldissara R Scotti LF Valandro Clinical Relevance Tribochemical silica coating and 5-nm thick silica nanofilm conditioning methods used on intaglio surfaces of zirconia crowns improves retention.
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