1994 Volume 7 Issue 2 Pages 198-204
There are several means to judge the prognosis of endosteal implant, of which the existance or nonexistance of mobility has the most important meaning. The Periotest can measure mobility objectively and quantitatively, but it has not been clarified yet whether Periotest values really have something to do with X-rays and histological views in animal experiments using ITI Bonefit Implant. We also thought that we could presume the connection of bones and implants by measuring torque, which is deeply related to the supporting power of implants on the jawbone.
We used a mature shepherd dog, and implanted five ITI Bonefit 2-part screw implants (two 8 mm, two 10 mm and one 12 mm) into the dog's mandible. About four months later, we made an undecalcified histologic section after radiography and measured Periotest values and removal torque.
The results were as follows:
1. In the X-ray view, whether bone radiograph is absent or if present in a middle amount, the difference of amount of radiograph did not express a distinct difference of Periotest value.
2. In the histological view, if the implant body is absent or one-half of it is present, difference of Periotest values was not found; regardless of whether or not bone resorption as well as implant body and bone fusion were present, the Periotest values were found to be low.
3. Removal torque was at least 15 kgfcm (about 147 Ncm) and showed comparatively bigger value than that of man.
