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The International Journal of Prosthodontics



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Int J Prosthodont 32 (2019), No. 2     28. Mar. 2019
Int J Prosthodont 32 (2019), No. 2  (28.03.2019)

Page 174-176, doi:10.11607/ijp.6080, PubMed:30856641

Randomized Controlled Clinical Trial Comparing Cemented Versus Screw-Retained Single Crowns on Customized Zirconia Abutments: 3-Year Results
Heierle, Linda / Wolleb, Karin / Hämmerle, Christoph H. F. / Wiedemeier, Daniel B. / Sailer, Irena / Thoma, Daniel S.
Purpose: To assess the biologic and technical responses to cemented and screw-retained all-ceramic singletooth implant-supported reconstructions at 3 years postinsertion.
Materials and Methods: Thirty-four patients with single-tooth implants were randomly restored with either a cemented lithium disilicate crown on a customized zirconia abutment (CEM) or a screw-retained crown with a directly veneered zirconia abutment (SCREW). At baseline examination and after 3 years of loading, marginal bone level and technical parameters were assessed. Differences in marginal bone loss were tested using Mann-Whitney U test at baseline and at 3 years, and changes within each group between baseline and 3 years were tested using Wilcoxon signed rank test.
Results: The median changes between baseline and the 3-year follow-up amounted to -0.1 mm (CEM; intragroup P = .36) and -0.0 mm (SCREW; intragroup P = .58). Intergroup comparisons did not reveal statistically significant differences at 3 years (P = .20) or over time (P = .70).
Conclusion: At 3 years, screwretained and cemented reconstructions rendered largely the same radiographic and technical outcomes.