Analysis of osseointegration of implants with a new macrogeometry: randomized clinical trial in split mouth

To verify the influence of macrogeometry with healing chambers on the osseointegration of dental implants, through the analysis of the implant stability quotient (ISQ) in addition to evaluate the correlation between insertion torque and insertion ISQ of implants with different macrogeometries. Thirty implants were installed in the posterior mandible of 15 patients, with sufficient bone height for the installation of implants measuring 3.5 mm in diameter and 9.0 mm in length. The implants had two types of macrogeometry: test group (GT) with 13 conical implants with healing chambers and control group (GC) with 13 conical implants with conventional threads. To insert the implants, a bone drilling protocol was used up to 3 mm in diameter with the last helical bur. The insertion torque of the implants was evaluated and then the ISQ at times 0 (T-0), 7 (T-7), 14 (T-14), 21 (T-21), 28 (T-28) and 42 (T-42) days. There was no significant difference between groups regarding insertion torque, with a mean value of insertion torque of 43 Ncm for both groups. For ISQ values, there was no difference between groups at the different times evaluated (p>0.05), except at T-7 (GT = 69.87?1.89 and GC = 66.48?4.49; p=0.01). There was no correlation between insertion torque and insertion ISQ (p>0.05). During the evaluated period, implants of 3.5 mm in diameter with macrogeometry, with or without healing chambers, inserted with a drilling protocol up to 3 mm in diameter of the last helical bur, obtained similar secondary stability, with no difference in ISQ values. Insertion torque did not correlate with insertion ISQ, providing similar primary stability to implants of both macrogeometries.