(A) Influence of bone density on mobility at placement; BQ-4 had the highest percent of implants that were mobile at the time of placement, which may be clinically significant. (B) Influence of crestal bone reduction at the time of placement on mobility at placement; crestal bone reduction did not have a major influence on the percent of implants mobile at placement. BQ-1 indicates bone density-1; BQ-2, bone density-2; BQ-3, bone density-3; BQ-4, bone density-4