The influence of mucosal tissue thickening on crestal bone stability around bone-level implants. A prospective controlled clinical trial

ObjectiveTo evaluate how bone-level implants maintain crestal bone stability after thickening of thin mucosal tissues with allogenic membrane. Materials and methodsNinety-seven bone-level implants of 4.1mm diameter (Institute Straumann AG, Switzerland) were evaluated in 97 patients (28 men and 69 women, mean age 47.31.2years). According to vertical gingival thickness, patients were assigned into test T1 (thin, 2mm or less, n=33), test T2 (thin thickened with allogenic membrane, n=32) and control C groups (thick, more than 2mm, n=32). Implants were placed in posterior mandible in one-stage approach and after integration were restored with single screw-retained metal-ceramic restorations. Radiographic examination was performed after implant placement, 2months after healing, after prosthetic restoration and after 1-year follow-up. Crestal bone loss was calculated mesially and distally. Mann-Whitney U-test was applied and significance was set to 0.05. ResultsAfter 2months, implants in group T1 had 0.75 +/- 0.11mm bone loss mesially and 0.73 +/- 0.10mm distally. Implants in group T2 had 0.16 +/- 0.06mm mesially and 0.20 +/- 0.06mm distally. C group implants lost 0.17 +/- 0.05mm mesially and 0.18 +/- 0.03mm distally. Differences between T1/T2, and T1/C were statistically significant (P=0.000) both mesially and distally, while between T2 and C was not significant mesially (P=0.861) and distally (P=0.827). After 1-year follow-up implants in group T1 had 1.22 +/- 0.08mm bone loss mesially and 1.14 +/- 0.07mm distally. Implants in group T2 had 0.24 +/- 0.06mm mesially and 0.19 +/- 0.06mm distally. C group implants lost 0.22 +/- 0.06mm mesially and 0.20 +/- 0.06mm distally. Differences between T1/T2, and T1/C were statistically significant (P=0.000) both mesially and distally, while between T2 and C was not significant mesially (P=0.909) and distally (P=0.312). ConclusionsSignificantly less bone loss can occur around bone-level implants placed in naturally thick mucosal tissues, in comparison with thin biotype. Augmentation of thin soft tissues with allogenic membrane during implant placement could be way to reduce crestal bone loss.