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| Study on the effect of adrenaline on gingiva based on the gingival biotype |
| SONG Yuanying1 ZHAO Qiang2▲ |
1.School of Stomatology, Weifang Medical University, Shandong Province, Weifang 261000, China;
2.Department of Oral and Maxillofacial Surgery, Beijing Aviation General Hospital, Beijing 100000, China |
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Abstract Objective To study the effect on gingival after treating with retraction cord of adrenaline for 5 minutes based on the gingival biotype. Methods From June to December in 2015, 15 internships with thick type and 15 internships with thin type from Beijing Aviation General Hospital were selected as volunteers, their bilateral maxillary central incisors were selected as experimental objects. Gingival retraction was performed by placing retraction cords with or without adrenaline on left and right maxillary central incisor respectively. The distance from incisal to free gingival margin of each sample was measured 3 times by vernier caliper before gingival retraction and 5 minutes, 1 day, 3 days, 7 days and 14 days after gingival retraction. The average value of the data measured above was taken as the final data. Results ①There was no significant difference in the distance from incisal to free gingival margin between 3 days after gingival retraction and before gingival retraction when treated with retraction cord of non-drug in thin type (P > 0.05). ②There was no significant difference in the distance from incisal to free gingival margin between 7 days after gingival retraction and before gingival retraction when treated with retraction cord of adrenaline in thin type (P > 0.05). There was no significant difference in the distance from incisal to free gingival margin between 3 days after gingival retraction and before gingival retraction when treated with retraction cord of adrenaline in thicktype (P > 0.05). ③After treated with retraction cord of adrenaline, the ratio of gingival recession distance to the distance from incisal to free gingival margin of thin typewere significantly changed compared with thick type at 5 mintues, 1 day and 3 days (P < 0.05). Conclusion ①It takes longer time for the gingival margin to recover the previous height in thin type when treats with retraction cord of adrenaline for 5 minutes compares with retraction cord of non-drug. ②No matter thick or thin type, the treatment with retraction cord of adrenaline for 5 mintues will not cause permanent damage to the gingiva. ③The gingival recession distance of thin type is longer than thick type when treats with retraction cord of adrenaline for 5 minutes.
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