1 research outputs found
Biomechanical evaluation of oversized drilling technique on primary implant stability measured by insertion torque and resonance frequency analysis
Background: This study evaluated the influence of implant site preparation depth on primary stability measured by
insertion torque and resonance frequency analysis (RFA).
Material and Methods: Thirty-two implant sites were prepared in eight veal rib blocks. Sixteen sites were prepared
using the conventional drilling sequence recommended by the manufacturer to a working depth of 10mm.
The remaining 16 sites were prepared using an oversize drilling technique (overpreparation) to a working depth
of 12mm. Bone density was determined using cone beam computerized tomography (CBCT). The implants were
placed and primary stability was measured by two methods: insertion torque (Ncm), and RFA (implant stability
quotient [ISQ]).
Results: The highest torque values were achieved by the conventional drilling technique (10mm). The ANOVA
test confirmed that there was a significant correlation between torque and drilling depth (p<0.05). However, no
statistically significant differences were obtained between ISQ values at 10 or 12 mm drilling depths (p>0.05) at
either measurement direction (cortical and medullar). No statistical relation between torque and ISQ values was
identified, or between bone density and primary stability (p>0.05).
Conclusions: Vertical overpreparation of the implant bed will obtain lower insertion torque values, but does not
produce statistically significant differences in ISQ values