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However, functional adjustments during this period remain poorly understood. This study aimed to characterize jaw and head movement adjustments in early adolescents and compare this to adults. Three\u2010dimensional optical cameras captured jaw and head movements during maximum jaw opening\u2013closing and chewing. Twenty (8 females, 12 males) adolescents (mean 13.5 yr, standard deviation [SD] 8 months) and 20 (9 females, 11 males) adults (mean 28.2 yr, SD 80 months) participated. Outcomes included jaw and head movement magnitudes, movement cycle time, time to first peak value, and initial phase. Functional data analysis and Wilcoxon rank\u2010sum tests were employed. Adolescents showed larger head magnitude in jaw opening\u2013closing and smaller jaw magnitude than did adults during chewing in the first movement cycle. Adolescents exhibited longer time to peak and time of first movement cycle during jaw opening\u2013closing. During chewing, adolescents showed a longer initial phase, time to peak for consecutive cycles, and movement cycle time. For both age groups, the first cycle differed from consecutive cycles in jaw and head movement magnitudes and cycle times. Compared to adults, adolescents displayed pronounced spatiotemporal initial jaw\u2013head movement adjustments during jaw function, particularly in the first movement cycle. Jaw\u2013head coordination refines from early adolescence into adulthood.<\/jats:p>","DOI":"10.1111\/eos.70035","type":"journal-article","created":{"date-parts":[[2025,8,13]],"date-time":"2025-08-13T06:04:22Z","timestamp":1755065062000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Jaw and head movement adjustments during jaw function\u2014Comparisons between and within 13\u2010year\u2010olds and adults"],"prefix":"10.1111","volume":"133","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9073-351X","authenticated-orcid":false,"given":"Evelina","family":"Nilsson","sequence":"first","affiliation":[{"name":"Department of Odontology Clinical Oral Physiology Ume\u00e5 University  Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0366-4609","authenticated-orcid":false,"given":"Charlotte 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