An evaluation of length and end-phrase of visual analogue scales in dental pain.

Visual analogue scales (VAS) of different lengths (5, 10, 15 and 20 cm) and with different end-phrases (troublesome, miserable, intense, unbearable and worst pain imaginable) were used to record pain in 50 male and 50 female patients with pulpitis or pericoronitis. All 100 patients successfully completed the questionnaire. High correlation was found between the scores on all the scales. Scales of length 10 or 15 cm had the smallest measurement error. The scale with the end-phrase 'worst pain imaginable' was found to be the best choice for comparing present pain or worst pain between different groups. Using this scale no significant difference was found between the scores of males and females or between those of patients with pulpitis and pericoronitis. This study suggests the use of 10 cm visual analogue scales with the end-phrase 'worst pain imaginable' as being the most suitable for measuring dental pain.