抄録
A resonance frequency analyzer (Osstell mentor: OSM, Integration Diagnostics) has been developed as a device for evaluating the intraosseous stability of implants.Implant stability quotient (ISQ) values derived from the device are intended to be employed as indices for evaluating intraosseous stability. The aim of this study was to find any changes over time in ISQ values in two-stage dental implants.
Test sites selected included upper jaw anterior implants (UA group), upper posterior implants (UP group), and lower posterior implants (LP group). For ISQ values, we made one measurement from each of the buccal, lingual or palatal, mesial and distal sides.Measurements of ISQ values were made at stage-one surgery (O1), stage-two surgery (O2), superstructure cementation (SC), and one year later (1Y). Items for analysis were 1)reliability of ISQ values, 2)changes of ISQ values over time for each implant site, and 3) relevance of ISQ values at O1 and 1Y.
1. It was revealed that ISQ values increased in reliability as a result of employing the average value of measurements made from 4 directions. 2. In all the groups, changes over time for ISQ values showed similar tendencies. The values increased from O1 to SC, but there was no difference between SC and 1Y. In addition, the LP group marked higher values than the UA and UP groups at all the measurement times. 3. The relation between O1 and the difference between 1Y and O1 was found to be a negative correlation in all groups.
ISQ values measured were found to have high levels of reliability. Changes in ISQ values from O1 to 1Y were revealed. It was also found that the lower the ISQ values at O1, the greater the increase of ISQ values during the test. On the contrary, the higher the ISQ values at O1, the lower the increase of ISQ values during the test.
