Masticatory dysfunction in older adults: A scoping review

Abstract Background Masticatory dysfunction impacts food selection, nutritional intake and social activities; all of which play a vital role to ensure good general health and quality of life. Despite the rapidly ageing population, there is limited evidence regarding the risk factors that lead to masticatory dysfunction in older adults or protective factors which may help maintain masticatory ability. Furthermore, there is currently no consensus for a specific test which measures masticatory ability. Objectives The objectives of this scoping review are to identify the risk and protective factors associated with masticatory dysfunction and determine the most commonly used objective measure of masticatory performance. Design A scoping review was performed using the PRISMA recommendations. MEDLINE (Ovid), Embase, Scopus and Web of Science databases were searched. Seventy‐eight articles were included in this review. There were six randomised controlled trials, six interventional studies, one systematic review, one quasi‐experimental study, five prospective cohort studies, 58 cross‐sectional studies and one case–control study. Data were analysed for frequency of studies reporting on risk factors, protective factors and/or objective measures of masticatory performance. Results This scoping review identified tooth loss as the most common risk factor for masticatory dysfunction. Other notable risk factors included musculoskeletal conditions such as frailty and sarcopenia, cognitive decline and malnutrition. Additionally, the review identified that the presence or addition of teeth was the main protective factor. Other protective factors included denture maintenance via liners and adhesives, textured foods, and oral exercises. Chewing gum was the most common objective measure of masticatory function, followed by the occlusal force and sieve methods. Conclusions This scoping review found that there was limited evidence for a causal link between each of the risk factors and masticatory dysfunction or the protective factors and the maintenance of masticatory ability in older adults. Establishing a standard method for measuring masticatory performance such as the commonly used chewing gum method and encouraging clinicians to routinely measure masticatory function will enable comparisons across multiple risk and protective factors, improving the evidence base and contributing to better patient care.