Abstract:
Reconstruction of bone atrophies and rehabilitation using dental implants are often
evaluated based on biologic aspects. As reconstructed jaw also has to ensure primary
implant stability, the goals of this study were to determine the mechanical quality of
regenerated bone and to investigate potential correlations of intraoperative bone density
testing with morphological variables ofstability of implants inserted in non-augmented
bone.
Ten minipigs were allocated for experiments. After extractions of mandibular
premolars, four implants each were placed in a total of four minipigs. Bone density was
determined by applying compressive tests using the BoneProbe. Implant insertion torque
and resonance frequency analysis were used to evaluate implant stability. Morphological
parameters were quantified after harvesting bone sections. Other six minipigs were
distributed with four lower jaw experimental sites each following teeth extractions.
Xenograft substitutes as well as autogenously bone were used for augmenting threewalled
defects, while native tissue served as the control. During implant placement
procedures bone quality was determined using intraoperative compressive testing,
insertion torque, and resonance frequency analysis. Histologically was determined bone
mineral density and bone-implant contact.
Assuming that the weak correlations observed were due to the limited sample size,
studies at a much greater scale involving various implant systems would however be
required.