BU Zhongqi1,GU Haijia1,YAO Siqi2.. Observation on the curative effect of crown lengthening surgery with piezosurgery[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2015, 45(6): 446-.
Abstract：Objective: To evaluate the effects of piezousurgery and high-speed burr in crown lengthening surgery. Methods: Sixty seven teeth in 60 examples with subgingival tooth defect but less than 4 mm, that got the value to preserve were selected. The examples are divided into two groups randomly. One group of 34 teeth in 30 examples used piezosurgery. The other group of 33 teeth in 30 examples used the high-speed burr. The defect of the lowest probing depth (PD), sulcular bleeding index (SBI), tooth mobility (TM) were recorded before operation, at one week after operation, 8 weeks after operation and 6 months after operation. Results: The after-operation PD and SBI of both group had significant changes. The difference was statistically significance (P<0.05), while comparison between the two groups, there’s no statistical significance in the difference of PD and SBI one week after operations (P>0.05), and there lies significant difference in PD 8 weeks after operations (P<0.05), but SBI had no marked difference, and all indexes after 6 months were the same as these after 8 weeks. Conclusion: These two kinds of operations both have good effect on patients who need crown lengthening surgery to recover the subgingival tooth defects. At the same time, piezosurgery causes less bone loss, smaller periodontal wound and the better recovery.
