This study aimed to investigate the association between skeletal bone mineral density (BMD) and periodontitis in
postmenopausal women of the Electricity Generating Authority of Thailand (EGAT) workers. This cross-sectional
study comprised of 395 postmenopausal women, aged 35-82 years old. BMD was assessed at three skeletal sites
by using dual-energy X-ray absorptiometry. BMD values at each site were converted into T-scores. The t-score at
the worst site was used to categorize each participant into osteoporosis, osteopenia, or normal BMD groups. The
periodontal assessments included probing depth (PD), clinical attachment level (CAL), plaque score, and number
of remaining teeth. The participants were classified into the no/mild periodontitis or moderate/severe periodontitis
groups. The mean BMD between the periodontitis groups and the mean periodontal variables between BMD categories
were compared. The degree of association between the BMD groups and periodontitis, adjusted for known confounders,
was analyzed using binary logistic regression. Comparing the two periodontitis groups, there was no significant difference
in the mean BMD at any skeletal sites or at the worst site. Among the BMD groups, there was no significant difference
in mean number of remaining teeth, mean PD, and mean plaque score, while the mean CAL difference of 0.3 mm
was demonstrated between the osteopenia and osteoporosis groups. (P<0.001). After adjusting for confounders,
there was no significant association between osteoporosis and periodontitis in postmenopausal participants, whereas
increasing age and plaque score > 40 % were the factors significantly associated with moderate/severe periodontitis
(P<0.05). There was no significant association between osteoporosis and periodontitis in postmenopausal women
of the EGAT population. However, studies in various populations should confirm this finding.