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Influence of the Residual Ridge Widths and Implant Thread Designs on Implant Positioning

Now online in the Journal of Prosthodontics, a new study co-authored by ACP member, Sompop Bencharit DDS, MS, PhD, FACP.

Aggressive implant macrothread designs are widely used, however, the effects of the thread design on the accuracy of static guided surgery, especially in a case of narrow residual ridge, have not been thoroughly studied. For this study, the authors evaluated the effects of two different implant macrothread designs and the residual ridge widths on the accuracy of tooth-supported static guided implant surgery.

Forty implant fixtures with two different macrodesigns (conventional and aggressive) were placed in 40 simulated polyurethane models with narrow and wide residual ridges. The placed implant positions were compared with the planned implant position and angulational deviation, as well as 3D deviations at the entry and apex of the implant were measured.

In terms of angulational deviation, there was no statistically significant difference in the mean deviations for both types of implants for wide and narrow ridge groups. However, the range of deviation was much larger in the narrow ridge of those in the aggressive thread group.

Aggressiveness of implant thread designs seem to improve implant placement accuracy when a guided surgery protocol is used. The width of residual ridge has little effect on the accuracy of implant placement in both nonaggressive and aggressive thread designed self-tapping implants.

Thanasrisuebwong P, Pimkhaokham A, Jirajariyavej B, Bencharit, S. Influence of the residual ridge widths and implant thread designs on implant positioning using static implant guided surgery. J Prosthodont 2022; 1– 7. https://doi.org/10.1111/jopr.13557

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