Clin Oral Implants Res. 2022 Feb 28. doi: 10.1111/clr.13913. Online ahead of print.
ABSTRACT
OBJECTIVES: To compare screw-retained and cemented all-ceramic implant-supported single crowns regarding biological and technical outcomes over a 5-year observation period.
MATERIALS AND METHODS: in 44 patients, 44 two-piece dental implants were placed in single tooth gaps in the esthetic zone. Patients randomly received a screw-retained (SR) or cemented (CR) all-ceramic single crown and were then re-examined annually up to 5 years. Outcome measures included: clinical, biological, technical and radiographic parameters. Data were statistically analyzed with Wilcoxon-Mann-Whitney, Wilcoxon and Fisher exact tests.
RESULTS: During the observation period, three patients (6.8%) were loss to follow-up. Eight restorations (18.2%, CI (8.2%, 32.7%)) were lost due to technical (6 patients, 13.6% (CI (5.2%, 27.4%)), 2 CR and 4 SR group, intergroup p=0.673; implants still present) or biological complications (2 patients, 4.5% (CI (0.6%, 16.5%)), only CR group, intergroup p=0.201, both implants lost). This resulted in a survival rate of 81.2% (CI (65.9%, 90.1%)) on the restorative level (18 SR; 15 CR, 3 lost to follow-up). At the 5-year follow-up, the median marginal bone levels were located slightly apical relative to the implant shoulder with 0.4 mm (0.5; 0.3) (SR) and 0.4 mm (0.8; 0.3) (CR) (intergroup p=0.582). Cemented restorations demonstrated a significantly higher biological complication rate (36.8%, SR 0.0%; intergroup p=0.0022), as well as a significantly higher overall complication rate (68.4%, SR 22.7%, intergroup p=0.0049). All other outcomes did not differ significantly between the two groups (p > 0.05).
CONCLUSIONS: All-ceramic single-tooth restorations on two-piece dental implants resulted in a relatively low survival rate. Cemented restorations were associated with a higher biological and overall complication rate than screw-retained restorations.
PMID:35224774 | DOI:10.1111/clr.13913
