Objective The novel coronavirus has reduced the availability of dental services, including domiciliary dental care. The suspension of dental treatment worsens the dental condition. However, the impact on domiciliary dental care during the coronavirus disease 2019 (COVID-19) pandemic remains unclear. Therefore, the aim of this study is to determine the impacts of the COVID-19 pandemic on domiciliary dental care and associated factors. Materials and methods This comparative study used Japanese prefectural claims data, including data from older adults who utilized domiciliary dental care. We compared the suspension of dental treatment during the firstwave of the COVID-19 pandemic with that before the COVID-19 pandemic. The outcome was the completion of four consecutive months of treatment. The chi-squared test, t-test, and logistic regression were applied. Result Approximately 23.4% of participants suspended home dental services during the first wave of the COVID-19 pandemic, whereas 11.7% suspended these services before COVID-19. Logistic regression clarified the effect of the following variables (during the first wave of COVID-19 vs. before COVID-19): care need level of long-term care was 1-5 (=severe) (odds ratio (OR): 0.92 vs. no significance (NS)), visit by hospital dentists (OR: 1.83 vs. NS), volume of patients in the visited place (2-9 people, OR: NS vs. 0.72; over 10 people, OR: 0.58 vs. 0.32), planned physicians' visit (OR: 0.71 vs. 0.77), and taxed income per population (OR: NS vs. 1.00). Discussion Domiciliary dental care, especially those in care facilities, were a vulnerable population during the pandemic. This may contribute to the delivery of domiciliary dental care during any future pandemics.
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