Periodontal breakdown inter-tooth relationships in estimatin
The reasons for tooth extraction are rarely recorded in epidemiological datasets. It poses a diagnostic challenge to determine if tooth loss is related to periodontal disease (TLPD).

The present study aimed to assess the inter-tooth relationships based on the periodontal characteristics of existing teeth.

A cross-sectional dataset of 8,978 participants with a complete periodontal examination (including probing pocket depth [PPD] and clinical attachment loss [CAL]) in the NHANES 2009–2014 was used in this study. Spearman rank correlation was applied to assess the inter-tooth correlations of PPD/CAL among 28 teeth after adjustment for relevant confounders.

- Strong PPD/CAL correlations were observed in adjacent teeth rather than those on non-adjacent teeth.

- The correlations increased among severe periodontitis cases. In line with this, they further observed that the teeth adjacent to the TLPD tooth had the most alveolar bone loss in the Java dataset.

The periodontitis parameters (PPD/CAL) of adjacent teeth could be a potential indicator to estimate TLPD when actual reasons for tooth extraction are unknown.

Journal of Dentistry