Abstract: Objective: To study the effect of root-reposition flap in reconstruction of buccal keratinized gingi-val. Methods: From June 2015 to June 2017, 100 patients with missing or too narrow buccal keratinized gingival were selected from our department of stomatology. According to the different methods of buccal keratinization gingival reconstruction were divided into control group and observation group with 50 cases in each group. Among them, the patients in the control group were treated with traditional implant meth-ods. In the observation group, the buccal keratinized gingiva was reconstructed by root reduction flap tech-nique. The reconstruction effect of buccal keratinized gingival was compared between the two groups. Results: There were 27 cases(54.00%) cured person in the observation group. The total effective rate of treat-ment was 94.00. Which were significantly higher than the control group 14 cases (P<0.05). After repair, the observation group of width of keratinized gingival was(1.85±0.71) mm, and the thickness of keratin-ized gingival was(2.91±0.53)mm, which was significantly better than the control group（1.23±0.33）mm, （1.98±0.46）mm(P<0.05). The gingival index of the implant teeth in the observation group was(0.38 ± 0.23) after 6 months. It was significantly lower than that in the control group (0.54 ±0.25)(P<0.05). There was no significant difference in gingival index, gingival bleeding between adjacent teeth and operation ar ea between the two groups. The degree of anastomosis of adjacent teeth, the beauty of crown and the de-gree of tooth imperfection in the observation group were significantly better than the control group(P< 0.05). Conclusion: The application of root reduction flap in the reconstruction of buccal keratinized gingi-val is more effective, good effect, high aesthetic degree and quick recovery, so it can be widely recom-mended in clinic.

Key words: dental implant prosthesis, root reposition flap technique, buccal keratosis gingiva, recon-struction