Female hormones fluctuation and chewing movement of patients with disc displacement

Abstract

Purpose: This study aimed to verify the influence of hormonal fluctuations on chewing movement in women with disc displacement (DD). Methods: Fourteen women with DD taking oral contraceptives (OC); 12 DD-free controls taking OC; 12 normally cycling women with DD; and 14 DD-free normally cycling women were included. The Research Diagnostic Criteria for Temporomandibular Disorders diagnosed DD, and subjects without pain were selected. Chewing movements were recorded using a kinesiograph. Dependent variables were: vertical, lateral, and anterior-posterior amplitudes (mm), opening and closing velocity (mm/s), which was evaluated in 4 phases of 3 menstrual cycles, identified by ovulation test. Data were submitted to Mauchly's sphericity test, Proc Mixed for repeated measures, and Tukey-Kramer test (P ≤ 0.05). Results: Comparisons among menstrual cycle phases showed no differences in vertical (P = 0.25), lateral (P = 0.12), and anterior-posterior amplitudes (P = 0.61); as well as opening (P = 0.57) or closing velocity (P = 0.73). The OC use or presence of DD did not influence the variables (P > 0.05). Conclusion: Hormonal fluctuation did not influence chewing mandibular movement of women with DD.

Effect of complete and partial removable dentures on chewing movements

“…A mean value was calculated for each parameter considering both sequences. The reproducibility of the chewing parameters was verified in a previous study in which intra‐class correlation coefficients ranged from 0·7 to 0·9, which was considered excellent.…”

Kinesiographic study of masticatory movements in denture wearers with normal and resorbed denture-bearing areas

“…Other masticatory parameters were obtained directly from the computer program (BioPak; Bio-Research). The reproducibility of masticatory measurements was verified in a previous study, 16 in which the intraclass correlation coefficients ranged from 0.7 to 0.9, which were considered excellent.…”

“…1,14 The study of mandibular movements will provide data on the duration, velocity, and displacement of individual masticatory cycles, and this essential information will enable better diagnoses of the health and function or dysfunction of the masticatory system. 15,16 Studies 17-23 evaluating the mandibular movements of complete denture wearers have found interesting results. Some 17,23 have reported minor differences for masticatory cycle characteristics, such as velocity and duration, between complete denture wearers and dentate persons, whereas others 19,24 have found significant restrictions on the masticatory movements in complete denture wearers.…”