In vitro evaluation of the type of implant bed preparation with osteotomes inbone type IV and its influence on the stability of two implant systems

ABSTRACT

Objectives: 1) To evaluate and compare the stability of two types of implants in an animal model after preparingthe implant bed with various sequences of osteotomes in bone type IV. 2) To evaluate the hypothesis of whetheror not the sequence of using osteotomes influences the primary implant stability.Material and Method: We selected bone from cow ribs, which in its cross section (the most medullar area of thebone) would be equivalent to a type IV human bone. We used fifteen ribs, in which six implant beds were preparedin each rib block using different preparation protocols for seating three conical Swiss Plus SPB implants of 3.7 x10 mm versus three MK III parallel wall implants of 4 x 10 mm.Three preparations, each with a diameter, weremade for the implants, using osteotomes that progressively increased the diameter of the implant bed. In the firstpreparation, the complete sequence of osteotomes was used; in the second preparation, the last osteotome was leftout; and in the third preparation, the implant was placed after only passing through the first osteotome. Once theimplants were seated, we proceeded to evaluate the stability (Osstell® ISQ-value). The locations were randomlychosen (by a coin toss).Results and statistical analysis: We performed a statistical analysis of the ISQ values that were obtained during thedifferent preparations carried out for the Mk III and Swiss Plus implants. The average range and standard deviationwere calculated. The hypothesis was compared by a two-way variance analysis (type of implant/ differentsequences of preparing the implant bed). It was considered significant for a p <0.05. The statistical results obtainedfor the values of the Mk III implant were significant (p = 0.042). Conclusions: The results of this in vitro study conclude that the tapered shape provides more primary stability to the implant and suggest that a short sequence of osteotomes in bone type IV provide more primary stability than the complete sequence (AU)

RESUMEN

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