Reason and purpose of the study: Bone loss, particularly at the level of the marginal bone crest, continues to be one of the main complications of implant treatment that compromises osseointegration and the rehabilitation. The aim of the present study was to evaluate radiographic marginal bone loss around short Morse taper connection implants and the survival rate of these implants 7, 30 and 90 days after placement in severely resorbed jaws.
Methods: Twelve patients were divided into two groups: a study group consisting of 20 implants measuring 6 mm in length and 3.75 mm in diameter, and a control group consisting of 20 implants measuring 8 mm in length and 3.75 mm in diameter. All surgeries were performed according to the protocol of morse taper connection implant of the Kopp System. The results were compared by one-way analysis of variance and the Tukey test.
Results: There was no significant difference between groups at any of the time points studied. The mean bone crest/implant shoulder distance was 1,36 mm (SD=1.01) on the mesial surface and was 1,10 mm (SD=0.87) on the distal surface for the 6-mm implants and 1,42 mm (SD=0.83) on the mesial surface and was 1,15 mm (SD=0.76) on the distal surface for the 8-mm implants after 90 days of implant placement. Two of the 40 implants were lost (one per group), corresponding to a survival rate of 95%.
Conclusion: Within the limitations of this study, we conclude that 6-mm long Morse taper connection implants present levels of crestal bone remodeling similar to those of 8-mm long implants.
Adriane Yaeko Togashi, Silmara Assunta Castaman, Adriano Yaeko Piccolotto and Eleonor