Botulinum Toxin for the Treatment of Gummv Smile.

[AIM] The aim was to evaluate the effect of botulinum toxin (Botox) injections as a conservative treatment for gummy smile.

[MATERIALS AND METHODS] An experimental in vivo study was conducted at a dermatology clinic in Riyadh in January 2016. The study included 23 female patients who ranged from 20 to 50 years and were treated with Botox injections due to excessive maxillary gingival display. The patients with short clinical crowns or long maxilla, those who were pregnant or breastfeeding, and patients with neuromuscular disorders were excluded. Patients received Botox type I, injected 3 mm lateral to the alar-fascial groove at the level of the nostril opening at the insertion of the levator labii superioris alaeque nasi muscle. Photos were taken of the patient's smile before and after the treatment and were then uploaded to the SketchUp program to calculate improvements in gingival display. The distance from the lower margin of the upper lip to the gingival margin was calculated pre- and posttreatment. The amount of improvement was calculated as (pre-Botox treatment - post-Botox treatment/pre-Botox treatment × 100). The mean percentage of the total improvement was analyzed.

[RESULTS] A total of 23 female patients received treatment to improve their gummy smile. Improvement was clear 2 weeks after Botox injection. The mean percentage of improvement in the gingival display was 99.6%.

[CONCLUSION] Botox type I is an effective conservative technique to improve gummy smile caused by muscular hyperfunction.

[CLINICAL SIGNIFICANCE] Patients' retention highly indicated that they were satisfied with the provided treatment by Botox injections. Improving the quality of life with least painful experience and immediate results was the major advantage for Botox type I.