USE OF FURCAL BONE SOUNDING TO IMPROVE ACCURACY OF FURCATION DIAGNOSIS

ACCURATE DIAGNOSIS OF PERIODONTAL DESTRUCTION in the furcation region of multi-rooted teeth is a critical component of treatment planning, w ith different therapeutic approaches chosen based upon clinical determ ination of the severity of involvement. The current study assessed bot h vertical and horizontal depths of 274 furcations from 67 patients at three separate time points: by probing prior to anesthesia, by bone s ounding after administration of anesthesia, and by direct measurement at the time of surgery. All measurements were made to the nearest mill imeter. The mean vertical (1.8 mm) and horizontal (2.16 mm) furcation depths determined prior to anesthesia were significantly less than sur gical measurements (2.79 mm and 3.65 mm, respectively). Use of soundin g significantly improved the mean accuracy of vertical (2.40 mm) and h orizontal (3.11 mm) furcation depth measurements relative to surgical determinations (P = 0.000). Surgical vertical depth was exactly the sa me as pre-anesthesia probing in 42% of furcations, within +/- 1 mm in 72.3% and within +/- 2 mm in 83.6%. Use of post-anesthesia sounding im proved agreement in vertical measurements to 59.5%, 85.7%, and 93.1%, respectively. Surgical horizontal depth was exactly the same as pre-an esthesia probing measurements in 47.1% of furcations, within +/- 1 mm in 68.3% and within +/- 2 mm in 77.4%. Sounding improved agreement of horizontal measurements to 64.2%, 83.6%, and 88.3%, respectively. Unde restimation of surgical furcation depths by pre-anesthesia probing was much more common than overestimation. Sounding reduced the percent an d degree of underestimation in all furcation types. The data demonstra te the ability of post-anesthesia bone sounding to significantly impro ve the diagnostic accuracy of furcation invasions.