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Volume 28 , Issue 4
July/August 2008
Pages 357-365

The Effect of All-Ceramic and Porcelain-Fused-to-Metal Restorations on Marginal Peri-implant Soft Tissue Color: A Randomized Controlled Clinical Trial

Ronald E. Jung, PD Dr Med Dent/Claudia Holderegger, Dr Med Dent/ Irena Sailer, Dr Med Dent1/Ameen Khraisat, DMD/Ana Suter, MDT/ Christoph H. F. Hämmerle, Prof Dr Med Dent

PMID: 18717374
DOI: 10.11607/prd.00.0813

The aim of this study was to test the color-change effect of all-ceramic restorations compared with porcelain-fused-to-metal (PFM) restorations on marginal peri-implant soft tissue. Thirty patients were randomly divided into 2 groups of 15 subjects each. The all-ceramic group received all-ceramic crowns on aluminum oxide–based abutments, while the PFM group received crowns on titanium or gold abutments. A reflectance spectrophotometer was used to measure the color difference (DE_Implant) between the midfacial peri-implant mucosa before and after restoration insertion. The color difference (DE_{Tooth-implant}) between the midfacial peri-implant mucosa and the gingival margin of the corresponding neighboring tooth was tested. The mucosal thickness was measured midfacially around the implant (MT_Implant) and neighboring tooth (MT_Tooth). DE_Implant values were similar for the all-ceramic (7.4 ± 2.7) and PFM groups (7.6 ± 2.8). The all-ceramic group induced significantly less visible mucosal color change (3.4 ± 1.4) compared to the PFM group (5.2 ± 2.3). The MT_Implant value of the all-ceramic group was 3.4 ± 0.8 mm, while that of the PFM group was 2.9 ± 0.9 mm, which was not significantly different. Significant differences were found when comparing MT_Implant (3.1 ± 0.9) and MT_Tooth (1.2 ± 0.3) values for test and control groups. All-ceramic restorations revealed a better color match to the neighboring teeth than PFM restorations. (Int J Peridontics Restorative Dent 2008;28:357–365.)

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