The application of crown lengthening in the restoration of residual root in old patients

Objective: To analyze the clinical effects of crown lengthening and gingivectomy of residual root on deep-seated subgingival in old patients. Methods: 60 old patients with 60 remnant root were selected and randomly divided into two groups: crown lengthening surgical group (30cases) and gingivectomy group ( 30 cases). The roots were restored with post crowns routincly 6 weeks after operation. Results: At 6 weeks follow up, the effective rate between crown lengthening group (6 weeks, 100%) and gingivectomy group (6 weeks, 80%) was statistically different. After one year, the complication of crown lengthening group (12 mon 11.2%) was lower than that of gingivectomy group (12 mon, 42.86% ) and was statistically different. Conclusion: Both gingivectomy and surgical crown lengthening could shorien the depths of the gingival pocket in the old patients. The clinical effect of the former is better than that of the latter for the present.