Prosthetic crowns made by the galvano-forming procedure are considered as highly biocompatible, stable and esthetic restorations. However, there are few data available on the clinical and biochemical effects of galvano-ceramic crowns on the periodontal tissues. Objectives: The purpose of this controlled study was to test the impact of two different crown systems on clinical and inflammatory responses of periodontal tissues. Methods: A prospective, blinded randomised clinical trial was performed. Galvano-ceramic crowns (AGC, Wieland, Germany) and conventional metal-ceramic crowns (Degunorm, Degussa, Germany) were compared in 26 periodontally healthy patients in a split-mouth study over a period of 12 months. Oral hygiene parameters were assessed. Clinical parameters (GI, PLI, PPD) were taken from six sites per tooth by one blinded examiner. Gingival crevicular fluid (GCF) flow rate was determined by Periotron 6000 (Harco, USA) and total IgG concentration in GCF by ELISA. Non parametric Wilcoxon test was used for statistical analyses. Results: All crowns are in adequate function and did not cause any visually inflammatory responses to the adjacent periodontal tissues. Galvano-ceramic crowns showed statistically significant less PLI at oral sites (0.1 vs 0.4, p=0.001), lower PPD at mesial sites (2.0 mm vs. 3.0 mm, p=0.029) and less IgG in GCF at distal sites (109 vs. 266 ng/ml, p=0.034). Gingival recessions were not observed. GI and GCF flow rate were not different between both groups. Conclusion: After 12 months, periodontal tissues adjacent to galvano-ceramic crowns show significant better clinical and inflammatory parameters. However, the differences were small in absolute numbers. Crowns made by the AGC procedure seem to be more biocompatible than conventional metal-ceramic crowns and may contribute to the maintenance of gingival health at prosthetic sites. Supported in part by DFG grant 325/3 and Wieland, Germany.

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