Effect of complete denture wearing on deglutition time: a cine-magnetic resonance imaging study

Utility of the luminance standard deviation to quantify magnetic resonance imaging motion artifact induced by tongue movement

Clear magnetic resonance imaging (MRI) is required to diagnose tongue cancer. However, the absence of occlusal support may cause tongue movements which are known to introduce artifacts on the MR image. This pilot study compared the manifest of artifacts from the tongue at rest and during motion using luminance standard deviation (LSD) to quantify the artifacts, in dentulous subjects. Participants were ten dentulous participants (5 males, 5 females; age 31.50 ± 8.38 years) with occlusal support. MRI was conducted with the tongue at rest and during lateral movement. The LSD was measured in the regions of interest (ROI) in the axial and sagittal planes. Tongue movement evoked unclear MR images, compared with the images taken at rest. Statistical analysis revealed that the LSD significantly differed between the tongue at rest and in motion in the axial (P = 0.004) and sagittal planes (ROI-A: P = 0.002, ROI-P: P = 0.006). These findings suggest that tongue movement introduces motion artifact and the LSD responds quantitatively to the magnitude of artifacts. Future studies will evaluate whether a prosthetic device used to provide occlusive support can decrease these artifacts when analyzed using LSD.

Estudo da associação entre doenças crônicas naturais do envelhecimento e alterações da deglutição referidas por idosos da comunidade

RESUMO Objetivo Investigar associação entre as alterações de deglutição autorreferidas com doenças crônicas naturais do envelhecimento, aspectos socioeconômicos, demográficos, nutricionais e de saúde bucal, em idosos da comunidade. Métodos Foi realizado um estudo de corte transversal, proveniente de um inquérito de saúde com 900 idosos de 65 anos ou mais, recrutados em domicílio, na zona urbana de Campinas, São Paulo/Brasil, no contexto do estudo “Fragilidade em Idosos Brasileiros”. Todos foram submetidos a medidas sociodemográficas, antropométricas, de rastreio cognitivo, entre outras. Aos idosos sem sinais sugestivos de demência foi aplicado protocolo com questões dicotômicas (sim/não), baseadas no autorrelato de doenças crônicas, sintomas depressivos, saúde bucal e alteração da deglutição. As associações e as razões de prevalência foram investigadas por meio de regressão de Cox e valores de p<0,05 foram considerados significativos. Resultados A amostra foi composta por 507 idosos com 72 (+/-5,2) anos de idade, em média, sendo a maioria mulheres (62%). As doenças crônicas naturais do envelhecimento mais referidas foram hipertensão (62,1%) e artrite/reumatismo (43,5%). Apenas 12,4% não relataram nenhuma doença crônica. Sensação de alimento parado (16%) e engasgos ao se alimentar ou ingerir líquido (14,4%) foram as alterações de deglutição mais referidas. Sensação de boca seca, maior número de doenças crônicas, cardiopatias e osteoporose foram associados com alterações de deglutição. O aumento de idade foi relacionado apenas ao pigarro, após ingestão de algum alimento. Conclusão A coocorrência de doenças crônicas e a sensação de boca seca foram os fatores mais relacionados às alterações de deglutição. A idade foi associada apenas ao relato de pigarro após alimentação.

Oral Health and Swallowing Problems

Oral health impacts systemic health. Therefore, oral care is an important consideration in maintaining quality of life (QOL). Previously, maintenance and improvement of oral hygiene was considered essential for achieving oral health. In addition to oral hygiene, oral care in terms of oral function is now considered to maintain QOL. Ingestion of exogenous nutrients via the oral cavity is fundamental to the function of all higher animals, not only human beings. Chewing and swallowing processes are critical for normal food intake, and adequate saliva supply and oral care to allow proper functioning of these processes are indispensable for maintaining QOL. In this review, we will summarize the relationship between chewing and swallowing and effects of saliva secretion on these functions, and discuss methods to maintain ingestion of exogenous nutrients and prevent swallowing problems, especially in elderly people.

The effects of removable denture on swallowing

Objective

To investigate the relationship between removable dentures and swallowing and describe risks.

Methods

Twenty-four patients with removable dentures 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 Kazunori's method, sensation of oral cavity by Christian's method, underlying disease, and National Institutes of Health Stroke Scale for level of consciousness were collected. Functional dysphagia scales, including the oral transit time (OTT), pharyngeal transit time (PTT), percentage of oral residue, percentage of pharyngeal residue, 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 before and after the removal of the denture for the OTT. OTT was significantly less after the removal of the denture (8.87 vs. 4.38 seconds, p=0.01). OPSE increased remarkably after the removal of the denture, but without significance (18.24%/sec vs. 25.26%/sec, 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, p=0.007).

Conclusion

A removable denture may have negative effects on swallowing, especially OTT and OPSE. These affects may be caused by impaired sensation of the oral cavity or masticatory performance induced by the removable denture.