ABSTRACT
The aim of this study was to compare the pain experience among orthodontic patients treated with self-ligating brackets SmartClip® (3M Unitek, Monrovia, California, USA) and conventional brackets Victory series® (3M Unitek, Monrovia, California, USA). We used a controlled clinical trial study design to compare 69 patients treated with self-ligating to 70 patients treated by conventional brackets. The nickel-titanium archwires 0.012-in were engaged after bonding both arches on the first day; and the visual analogue scale (VAS) was used to assess the pain experience of subjects for the first seven treatment days. The pre-treatment dental study models were assessed by the Little’s irregularity index to quantify the groups’ malalignment characteristics. The self-ligating brackets reported lower pain experience than the conventional group on the first five treatment days. However, the sixth day showed 1.75 mm higher visual analogue score than conventional brackets, with almost equal pain level on the seventh day. The group differences throughout the first week were neither clinically nor statistically significant. The pain experiences in both groups decreased steadily from the third treatment day to the end of the first week of treatment. Based on the study findings, the pain experience during initial alignment is not influenced by the brackets’ ligation type. The pain experience tends to decrease steadily from the third treatment day to the end of the first week of treatment irrespective of the bracket type used.
ABSTRACT
Introdução: A terapia com LED de baixa intensidade tem sido reportada por seu efeito analgésico e anti-inflamatório. Objetivo: Analisar a sintomatologia dolorosa após movimentação ortodôntica associada ou não à terapia não-coerente. Método: Vinte nove voluntários (19,8±7,9 anos) selecionados foram divididos em três grupos: controle (n=10), placebo (n=9) e LED (n=10, InGaAlP, 630±10nm, 14J/cm2, 0,10W, 70s). Os participantes tiveram os molares separados ortodonticamente e receberam orientação para anotar o nível de dor entre o momento da separação e 168 horas experimentais. Resultados: O grupo LED apresentou redução (p<0,01) da dor em relação aos grupos controle (2 horas) e placebo (72 horas). O grupo placebo mostrou diminuição (p<0,01) da dor em relação ao grupo controle (6h e 120 horas). Conclusão: Houve efeito positivo da fototerapia nos momentos iniciais da movimentação ortodôntica, sem variações no decorrer do período experimental.
Introduction: Therapy with low intensity LED has been reported for its analgesic and anti-inflammatory effect. Objective: Analyze the pain symptoms after orthodontic tooth movement associated or not to coherent and non-coherent phototherapy. Method: Twenty nine volunteers (19.8±7.9 years) were divided into three groups: control (n=10), placebo (n=9) and LED (n=10, InGaAlP, 630±10nm, 14 J/cm2, 0.10W, 70s). The participants? molars were orthodontically separated, and they were instructed to write down pain level using a visual analog scale between the separator placement and 168 experimental hours. Results: The LED group showed reduction in pain at two hours compared to the control group (72 hours). The placebo group presented a decrease of pain levels in relation the control group (6 and 120 hours). Conclusion: There was positive effect of phototherapy in the early stages of orthodontic movement without variation during the experimental period.