The effect of a combination of clinical crown lengthening surgery and botulinum toxin A injection in gummy smile treatment

Year 2022, Volume: 39 Issue: 3, 686 - 692, 30.08.2022

Viet Tran Ho Hao Nguyen Trong Nam Huynh Cong-nhat Vu Dien Hoa Anh Anh Nguyen-ho Quynh Hien Nguyen Thi Minh Thuy Nguyen

Abstract

In many cases, the cause of a gummy smile is not single but a combination of many factors affecting it simultaneously. Therefore, relying on a single method will be difficult to treat comprehensively and achieve the maximum aesthetic requirements for the patient. This study aims to evaluate the efficacy of a combination of a clinical tooth crowns lengthening surgery following by a BTX-A injection in gummy smile treatment upon based on clinical assessment and photography. 21 patients aged from eighteen years with an average length of excessive gingival display ≥ of 4 mm when maximum smiling and the height of keratinized gingiva ≥ 3 mm were recruited. The gingival exposure (GE) and the clinical crown length (CCL) were measured at baseline T0, two months after performing clinical crown lengthening surgery (T1), two weeks after BTX-A injection (T2), two months after BTX-A injection (T3). The GE in individual teeth after crown lengthening surgery (T1) and BTX-A injection after two weeks (T2) and two months (T3) were significantly different (p <0,001). The CCL was significantly changed after gingivectomy surgery (T1) compared to preoperative (T0) (p <0.001). BTX-A could be considered as a favorable adjunctive treatment for gummy smile patients after gingivectomy surgery.

Keywords

crown lengthening, smiling, injection, botulinum toxin A

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