Abstract: | [Purpose] The aim of this study was to determine the inter-rater and intra-raterreliability of the mandibular range of motion (ROM) considering the neutral craniocervicalposition when performing the measurements. [Subjects and Methods] The sample consisted of50 asymptomatic subjects. Two raters measured four mandibular ROMs (maximal mouth opening(MMO), laterals, and protrusion) using the craniomandibular scale. Subjects alternatedbetween raters, receiving two complete trials per day, two days apart. Intra- andinter-rater reliability was determined using intra-class correlation coefficients (ICCs).Bland-Altman analysis was used to assess reliability, bias, and variability. Finally, thestandard error of measurement (SEM) and minimal detectable change (MDC) were analyzed tomeasure responsiveness. [Results] Reliability was good for MMO (inter-rater, ICC=0.95−0.96; intra-rater, ICC= 0.95−0.96) and for protrusion (inter-rater, ICC= 0.92−0.94;intra-rater, ICC= 0.93−0.96). Reliability was moderate for lateral excursions. The MMO andprotrusion SEM ranged from 0.74 to 0.82 mm and from 0.29 to 0.49 mm, while the MDCs rangedfrom 1.73 to 1.91 mm and from 0.69 to 0.14 mm respectively. The analysis showed no randomor systematic error, suggesting that effect learning did not affect reliability.[Conclusion] A standardized protocol for assessment of mandibular ROM in a neutralcraniocervical position obtained good inter- and intra-rater reliability for MMO andprotrusion and moderate inter- and intra-rater reliability for lateral excursions.Key words: Reliability, Range of motion, Temporomandibular joint |