Effect of Clinical Crown Lengthening Surgery and Botulinum Toxin A Injection in Gummy Smile Treatment

"* Clinical dental crown lengthening surgery protocol: a clinical crown lengthening surgery was performed.~* Post-operation protocol Patients were all prescribed antibiotics , anti-inflammation, analgesic, and an antiseptic mouthwash. Patients were instructed for oral hygiene and recalls.~* Botulinum Toxin A injection One hundred units (U) of botulinum toxin A (BTX-A) were diluted with 2.5ml of sterile saline solution without shaking. 1 mm syringe with a 30-gauge needle was used to get 0.25ml BTX-A for four-point injection, or 0.6ml in case injection of 6 points. Cold compress was applied extraoral 5 mins at injection site before injection.~After local anesthesia, the doctor administered slowly 2,5 U of diluted BTX-A at each point until white cellulite appeared.~Patients were recalled two weeks (T2), and two months (T3) after injection."