Botulinum Toxin A in the Management of a Gummy Smile: A Clinical Controlled Preliminary Study.

BACKGROUND: Botulinum toxin type A (BTX-A) is recent technique for the treatment of gummy smile. OBJECTIVES: The aim of this randomized controlled preliminary clinical trial was to evaluate the effects of BTX-A on excessive gingiva display (EGD) reduction, muscle activity, and patient satisfaction at 2, 8, 12, 16, 21, and 25 weeks. METHODS: Group 1 (G1) received 4 points of BTX-A application (2 U/point) for relaxation of the levator labii superioris alaeque nasi and levator labii superioris muscles; Group 2 (G2) received 2 points of BTX-A (2 U/point) for relaxation of only the levator labii superioris alaeque nasi muscle. RESULTS: A high dropout of patients from follow-up sessions occurred. Therefore, because of this data limitation, the results were considered a preliminary outcome. At 2 weeks, there was a significant difference between baseline regarding the reduction of EGD in G1 and G2, reduction in muscle activity in G1, and increased satisfaction in G1 and G2. At 2 weeks, there was no difference between the 2 groups. Statistically significant EGD reduction was maintained until 16 weeks in G2 and 25 weeks in G1. After 14 days there was a gradual recovery of muscle activity in both groups until recovery of baseline values by 25 weeks. Patients' satisfaction with treatment lasted 21 weeks in G1 and 16 weeks in G2. CONCLUSIONS: Increasing the number of BTX-A injection points resulted in a prolonged effect regarding EGD reduction and patient satisfaction but did not increase the intensity of the outcome. However, due to the high dropout of patients, this is a preliminary conclusion and further studies are necessary to confirm these results.

Functional electrostimulation associated with phonation in women without vocal disorders. / Eletroestimulação funcional associada à fonação em mulheres sem alterações vocais.

PURPOSE: To verify the immediate effect of the Excitomotor Electrical Current, called Functional Electrical Stimulation (FES), on vocal quality, Maximum Phonation Time (MPT) and possible discomfort, in women without vocal alteration, with application at Maximum Supported Intensity (MSI) and associated with phonation. METHODS: Experimental study with 20 normophonic adult women. They emitted the sustained vowel / a / and then it was applied to FES during emission of the same vowel. There were five series with three minutes of emission each, interspersed with passive rest. The electrical stimulus was at the MSI by the participant, adjusted by series. Before and after the emissions the voices were recorded and the MPT and the intensity of the stimuli were collected. The vocal quality was rated by judges. Statistical analysis made it possible to compare pre and post emission / electrostimulation data in each phase. Qualitative analysis was performed based on self-reported symptoms. RESULTS: There was no difference in vocal quality and MPT between pre and post moments in both phases. The difference between MSI and stimulus perception intensity was greater in series 1 than in series 2. There was an increase in MSI in series 5 compared to series 1. No significant negative symptoms or within 48h after procedures were reported. CONCLUSION: The FES at MSI, associated with phonation, did not generate an immediate change in vocal quality, in the MPT or self-reported discomforts by women without vocal alteration, even with a gradual increase in the stimulus, series by series.

OBJETIVO: Verificar o efeito imediato da corrente elétrica excitomotora, denominada FES, na qualidade vocal e no tempo máximo de fonação (TMF), e possíveis desconfortos, em mulheres sem alteração vocal, com aplicação em intensidade máxima suportada (IMS) e associada à fonação. MÉTODO: Estudo experimental com 20 mulheres adultas normofônicas. Elas emitiram a vogal /a/ sustentada e depois foi aplicada a FES durante emissão da mesma vogal. Foram cinco séries com três minutos de emissão cada, intercaladas com descanso passivo; o estímulo elétrico foi na IMS pela participante, ajustado por série. Antes e após as emissões as vozes foram gravadas e coletados os TMF e a intensidade dos estímulos. A qualidade vocal foi classificada por juízes. Foram comparados os dados pré e pós emissão/eletroestimulação em cada fase. A análise qualitativa foi realizada a partir de sintomas autorreferidos. RESULTADOS: Não houve diferença na qualidade vocal e nos TMF entre os momentos pré e pós nas duas fases. A diferença entre a IMS e a intensidade de percepção do estímulo foi maior na série 1 em relação à série 2. Houve aumento da IMS na série 5 em relação à série 1. Não foram relatados sintomas negativos imediatos ou em até 48 horas após os procedimentos. CONCLUSÃO: A corrente FES em IMS, associada à fonação, não gerou mudança imediata na qualidade vocal, nos TMF ou desconfortos autorreferidos pelas mulheres sem alteração vocal, mesmo com aumento gradual do estímulo.