Clinical trial NCT03717987: The Effect of Botulinum Toxin A In Patients With Excessive Gingival Display With And Without Zinc Supplementation
Official title: The Effect of Botulinum Toxin A In Patients With Excessive Gingival Display With And Without Zinc Supplementation
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Excessive Gingival Display
Keywords: gummy smile
Botulinum toxin type A
excessive gingival display
Lead sponsor: Cairo University
Sponsor class: OTHER
First posted: 2018-10-24
Enrollment: 26
Sex: ALL
Minimum age (years): 18
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: It has been noted since the start of using botulinum toxin for both medical and cosmetic indications that some patients simply don't achieve the responses to the drug that others do, leading to increased dose requirements and more frequent treatments. It was from this observation that researchers started to look at the zinc levels of patients and consider the concept of supplementation. In a recent systematic review, it was reported that there is very scant evidence to determine the exact clinical effects and duration of BTX-A when injected to treat gummy smile patients. Therefore, the investigators want to administrate of zinc supplements to patients prior to BTX-A injection to study if it will enhance its clinical effects, since it is from the zinc dependent metalloprotease family, where for each botulinum toxin molecule to be effective in paralyzing a muscle response it must be associated with a molecule of zinc which could be found within the cells of the body.

Participants with esthetic concern of excessive gingival display who meets the inclusion criteria will be assigned randomly and blindly to one of the 2 groups. Patients in the intervention group will take zinc supplement tablets to increase zinc levels for 4 days before botulinum toxin injections. While patients in the control group will take placebo tablets 4 days prior to the injections. All tablets will be placed in envelopes for blinding the operator, and numbered by a supervisor to allocate patients again in their groups for statistical results. Botulinum toxin type A will be injected in all patients at both sides into the "Yonsei point," (3Units) the point that would target 3 muscles responsible for upper lip elevation during smiling, including the LLSAN, in a single injection. This landmark was identified as the center of a triangle formed by the convergence of the LLSAN, the LLS, and the Zminor muscles and is located 1 cm lateral to the ala horizontally and 3 cm above the lip line vertically in both men and women. After 2 weeks the patients would come for an additional touch up dose (1 unit at each injection point).


Eligibility criteria: Inclusion Criteria:

* Patients with excessive gingival display \>3mm.
* Adults \>18 years.
* Non-smokers.
* Systemically healthy.
* Normal clinical crown dimensions.
* Hypermobile lip and Short or mild VME.

Exclusion Criteria:

* Severe VME.
* Pregnant or lactating females.
* Patients with inflamed gingiva or gingival enlargement.
* Inflammation or infection at the site of injection.
* Patients with known allergy to any of the components of BTX-A or BTX-B (i.e. BTX, human albumin, saline, lactose and sodium succinate).
* Patients using anticholinesterase or other agents interfering with neuromuscular transmission.
* Psychologically unstable or who have questionable motives and unrealistic expectations.
* Dependent on intact facial movements and expressions for their livelihood (e.g. actors, singers, musicians and other media personalities).
* Afflicted with a neuromuscular disorder (e.g. myasthenia gravis, Eaton-Lambert syndrome).

Primary outcomes:
measure: Change in the amount of gingival display
timeFrame: it will be measured after 2 weeks, then after 6, 12, 18 and 24 weeks
Secondary outcomes:
Other outcomes:
Locations:
city: Cairo
country: Egypt
facility: Faculty of Dentistry, Cairo University
Study officials:
References:
citation: Shemais N, Elarab AE, ElNahass H. The effect of botulinum toxin A in patients with excessive gingival display with and without zinc supplementation: randomized clinical trial. Clin Oral Investig. 2021 Nov;25(11):6403-6417. doi: 10.1007/s00784-021-03944-2. Epub 2021 May 5.