Influence of overdenture abutment tooth contour on the periodontium: a preliminary report

The effect of overdenture abutment tooth contour on plaque retention and periodontal health was evaluated in four patients over a 1-year period. Each patient had mandibular canines with similar periodontal support; however, one abutment was dome shaped while the other had 2 mm of natural peripheral root contour coronal to the ginvival margin. Eight parameters of periodontal health were measured, and no significant differences between different contours were observed after 1 year. Furthermore, irrespective of overdenture abutment contour, no deterioration in periodontal status occurred. Two subjects had significant wear of the overdenture abutments after 1 year. Further evaluation of more subjects over a longer period of time is indicated.