The aim of this study was to evaluate the clinical reliability of the Pederson index in preoperative assessment of the difficulty of\nsurgical removal of impacted mandibular third molars. Pederson index was found to be unreliable predictor of true difficulty with\nlow sensitivity and specificity. A new index (Kharma scale), which takes into consideration the anatomical form of tooth roots, is\nproposed and evaluated both pre- and postoperatively.The results of the evaluation indicate that the new estimating index is more\nreliable and accurate measure than Pederson scale.
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