Abstract
Objective: To investigate the effect of crown lengthening on patients with different periodontal biological types. Methods: 60 patients with different periodontal biotypes treated in our hospital from May 2017 to February 2019 were retrospectively analyzed. According to the different periodontal biotypes, the above-mentioned patients were further divided into control group (thin fan type, 30 cases) and observation group (thick flat type, 30 cases).The periodontal probing depth (PD), plaque index (PLI), bleeding index (BI) and gingival margin position at 1 week, 1 month, 2 months and 3 months after operation were compared between the two groups. Results: The PD, Bi and PLI values of the two groups after treatment were lower than those before treatment (P<0.05);There was no significant difference in gingival margin position between the two groups after 1 week to 1 month and 1 month to 2 months (P>0.05);After 2 months to 3 months of treatment, the gingival margin distance of the observation group was larger than that of the control group, and the difference was statistically significant (P<0.05). Conclusion: Crown lengthening can effectively improve the periodontal indexes of different periodontal biotypes, and the gingival margin of thick and flat type patients moves more toward the crown.