Chang Ho Hwang
Ulsan University Hospital, Republic of Korea
Dr. Chang Ho Hwang is a Medical doctor, physiatrist, Associate Professor, & Adjunct Professor. He is Associate professor, Department of Physical medicine & Rehabilitation, Ulsan University Hospital, University of Ulsan College of Medicine. He is honored as one among 2000 Outstanding Intellectuals of the 21st Century by WHO. He is a member of many societies and academies. Dr Hwang is serving as Editorial Board member of several International journals.
Objective: To investigate the relationship between removable dentures and swallowing and find the affecting factors. Method: 24 patients with removable denture who were referred for videofluoroscopic swallowing study (VFSS), were enrolled. We evaluated the change of swallowing function using VFSS before and after the removal of the removable denture. The masticatory performance by Kazunoris method, sensation of oral cavity by Christians method, underlying disease, and National Institutes of Health Stroke Scale (NIHSS) for level of consciousness were collected. Functional dysphagia scales, including the oral transit time (OTT), pharyngeal transit time (PTT), percentage of oral residue (ORES), percentage of pharyngeal residue (PRES), oropharyngeal swallow efficiency (OPSE), and presence of aspiration were measured.
Results: Four patients dropped out, and 20 patients were analyzed (stroke: 13 patients, pneumonia: 3 patients, and others: 4 patients). The mean age was 73.3±11.4 years. There were significant differences between before and after the removal of the denture for the OTT. OTT reduced significantly after the removal of the denture (8.87 vs. 4.38s, p=0.01). OPSE increased remarkably after the removal of the denture, but did not show significant difference (18.24 vs. 25.26%/s, p=0.05). The OTT and OPSE, while donning a removable denture, were correlated with the masticatory performance (OTT: p=0.04, OPSE: p=0.003) and sensation of oral cavity (OTT: p=0.006, OPSE: 0.007).
Conclusion: A removable denture may give negative effects on the swallowing function, especially OTT and OPSE. These affections may be caused by impaired sensation of the oral cavity or masticatory performance, induced by the removable denture.