[Perception of pain in orthodontic treatment with thermoformed aligners].

INTRODUCTION: The aim of this study was to assess pain generated during orthodontic treatment with aligners in terms of intensity, duration and characteristics. MATERIALS AND METHODS: The sample consisted of 106 patients. Pain was analyzed according to intensity and characteristics using the Saint Antoine Pain Questionnaire (French Mac Gill questionnaire). For statistical analysis, Student tests were performed. RESULTS: 84% of patients experienced low to moderate pain, with a significantly higher intensity in women. Thirty-one per cent of patients consumed analgesics, although no established correlation was observed between intensity of pain and analgesics. For 53% of patients, duration of pain was </= 2 days; for 15% of patients, the pain lasted 7 days. Among patients aged >/= 40 years, duration of pain was significantly lower than in those aged < 40 years. Ten characteristics of pain were selected as described by at least one third of patients. CONCLUSION: Orthodontic treatments with aligners cause mild to moderate pain, which usually lasts 2 to 3 days, but may last 7 days. This pain is described as a sensation of "compression", "twinges", "squeezing", "tightness", "stretching", "cutting", and as being "tiresome", "bothersome", "unpleasant", or even "a nuisance".