Tooth Occlusion and Dementia: Study Links Posterior Occlusal Contact Loss to Higher Dementia Risk

Participants had undergone specific health checkups, had no prior history of dementia, and were classified according to their dental occlusal contact. Dementia diagnoses were determined using ICD-10 codes, and participants were divided into three groups-A, B, and C-based on the Eichner classification, which indicates the extent of occlusal contact. Over an average follow-up period of 35.6 months, 691 dementia were identified among 931,309 participants.

Those diagnosed with dementia were more likely to belong to Eichner B and C groups, signifying reduced occlusal contact. After adjusting for covariates, the hazard ratios (95% confidence intervals) for Eichner B and C were 1.73 (1.31–2.28) and 2.10 (1.35–3.26), respectively. Sensitivity analyses confirmed these findings in adults aged 60–75. These findings suggest that reduced posterior occlusal contact correlates with an increased risk of dementia. Since the study is limited to participants under the age of 75, further research is required to determine its generalizability to older populations.

Reference:

Miyano, T., Tamada, Y., Kusama, T. et al. Longitudinal association between posterior occlusal contact and dementia development in a large retrospective cohort study using a Japanese claims database. Sci Rep 14, 27513 (2024). https://doi.org/10.1038/s41598-024-79399-8