Twenty-five healthy right-handed females (25.2 ± 4.5 years old; body weight, 51.7 ± 6.0 kg; body height, 162.7 ± 3.5 mm; and length of the left upper limb, 51.9 ± 1.9 mm) were recruited from the Fourth Military Medical University (FMMU). All subjects had 28–32 teeth that arranged well with the Class I molar relationship and optimal 2 to 5 mm overbite and overjet. The exclusion criteria included known signs, symptoms, or history of temporomandibular disorders, craniocervical disorders [17 (link)], previous craniofacial trauma, bruxism history, known periodontal problems, history of tooth restorations or orthodontic treatment or orthognathic surgery, gum-chewing habit (over 30 min a day) [18 (link)], or disease history of the upper limbs. All volunteers signed informed consent, and the FMMU Institutional Review Board Committee approved the procedures. The study was conducted following the ethical standards in the 1964 Declaration of Helsinki.
Free full text: Click here