Clinical and radiological results of patients treated with three treatmentmodalities for overdentures on implants of the ITI (R) Dental Implant System - A randomized controlled clinical trial

In a randomized controlled clinical trial carried out at the Ignatius teach ing hospital in Breda, The Netherlands, 110 edentulous patients with severe mandibular bone loss were treated with implants of the ITI(R) Dental Impla nt System using 3 different treatment strategies: a mandibular overdenture supported by either 2 implants with ball attachments, 2 implants with an in terconnecting bar, or by 4 interconnected implants. In this study, results of clinical and radiographic parameters were evaluated and compared over a period of 19 months after implant placement. A total of 283 ITI(R) Dental I mplants were placed. Six implants (2%) were lost during the osseointegratio n period. No further implant losses occurred after that. At the 19 month ev aluation mean values and standard deviations for bleeding index were 0.51+/ -0.5 (bleeding incidence=70%) and for plaque index they were 0.46+/-0.5 (pl aque incidence=45%). The mean values and standard deviations for probing de pth and loss of attachment were 2.7+/-1.1 mm and 0.26+/-0.6 mm respectively . The radiographic evaluation showed a mean bone loss of 1.5 mm+/-0.26 afte r 19 months for all the implants. In cases with 4 interconnected implants t here was significantly more bone loss around the central 2 implants (2.1+/- 0.31 mm) in comparison with the lateral 2 (1.4+/-0.25 mm). No significant c orrelations were found between plaque and bleeding indices and bone loss.