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document
Mandibular overdentures supported by two Brånemark , IMZ or ITI implants : a 5-year prospective study . OBJECTIVES The aim of this prospective comparative study was to evaluate the survival rate and the condition of the peri-implant tissues of the IMZ implant system ( two-stage cylindertype ) , the Brånemark implant system ( two-stage screwtype ) and the ITI implant system ( one-stage screwtype ) supporting a mandibular overdenture during a 5-year follow-up period . MATERIAL AND METHODS Three groups of 30 edentulous patients were treated with two endosseous implants in the interforaminal region of the mandible . Clinical and radiographic parameters were evaluated immediately after completion of the prosthetic treatment and after 1 , 2 , 3 , 4 and 5 years of functional loading . RESULTS The five-year survival rate is 98.3 % for the IMZ group , 98.3 % for the Brå group and 100 % for the ITI group . Mean scores on indices for plaque , calculus , gingiva and bleeding were very low at all evaluation periods . Mean marginal bone loss over a period of 5 years , was 1.4 mm for the IMZ group , 0.7 mm for the Brå group and 0.9 mm for the ITI group . CONCLUSION It is concluded that two implants placed in the interforaminal region , connected with a bar , supply a proper base for the support of a mandibular overdenture in the edentulous patient . After 5 years no clinically relevant and statistically significant radiographic changes had developed between the three implant systems .
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Outcome_Other
survival rate
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Outcome_Other
the condition of the peri-implant tissues
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Outcome_Physical
Mean scores on indices for plaque , calculus , gingiva and bleeding
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Outcome_Physical
Mean marginal bone loss over a period of 5 years
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Participant_Sample-size
30