Endodontic effects of root planing in humans.

Although the deliberate removal of cementum by root planing remains part of periodontal therapy, its scientific basis is under challenge. A potentially harmful effect of root planing is the exposure of dentinal tubules to the oral environment; this study investigated the short-term endodontic effects of root planing in humans. Ten teeth with significant loss of periodontal attachment had one proximal surface root planed; the other proximal surface was not root planed. After 10-14 days, the teeth were extracted and processed for light microscopic and SEM examination. Hypersensitivity to thermal stimuli was reported by 4 subjects after root planing. Chronic pulpitis was found in 3 pulps adjacent to the area of root planing. Bacterial penetration of dentin was observed, although the depth of penetration was less than reported by others. The results indicated that previous perceptions of the beneficial role of root planing in periodontal therapy require reconsideration.