Abstract
The principle underlying multi-frequency forced oscillation is the forced oscillation technique (FOT). The multi-frequency forced oscillation technique is used to examine patients with respiratory diseases, such as bronchial asthma (BA) and chronic obstructive pulmonary disease (COPD). There have been reports of factors affecting respiratory resistance (resistance) and reactance obtained with FOT, but there have been no reports on the effect of dentures on FOT. Herein, we report the effect of dentures on FOT. This study included 52 patients with removable dentures and 60 patients without dentures. We evaluated multi-frequency forced oscillation in patients with and without dentures and examined the condition of the dentures in the patients with removable dentures. We performed statistical calibration of results of resistance and reactance. The resistance was significantly higher in the without-denture group than in the with-denture group. The resistance and low-frequency reactance were higher in the with-denture group than in the without-denture group, and the high-frequency reactance was higher in the without-denture group than in the with-denture group. In the logistic regression analysis, subjective symptoms in the group with mandibular dentures and the number of mandibular dentures were found to affect FOT. We found higher FOT values in patients without dentures than in those with dentures because there were many BA patients without dentures in this study, and the BA pathognomonic disease state affected the FOT values. Patients with dentures showed higher FOT values, suggesting that higher FOT values are related to unstable dentures.
