The relationship between maternal periodontal and dental health status and preterm birth: A case-control study

The idea that oral infections spread to other systems has long been of interest to clinicians. On the other hand, there are researches suggesting the possibility of periodontitis and dental caries being a risk factor for low birth weight (LBW) and preterm birth (PTB). The purpose of this study is to investigate the relationship between periodontal and dental health status with PTB.

In this case-control study, 82 pregnant women were evaluated. The case group included mothers with preterm infants (gestational age of less than 37 weeks), while the control group involved mothers who had term labors (gestational age of 37-42 weeks). Oral examinations were carried out up to 48 hours after delivery. Periodontal and dental health indicators, including decayed, missed, filled teeth (DMFT), periodontal pocket depth, clinical attachment loss (CAL), bleeding on probing (BOP) and gingival index (GI) were recorded. The data were analyzed using SPSS 17 software through Kolmogorov–Smirnov, Mann-Whitney U and Fisher exact tests.

DMFT was 7.34±4.45 and 5.68±4.29 for mothers with preterm infants and mothers in control group, respectively (P=0.023). CAL (P=0.001) and BOP (P=0.012) were significantly higher in mothers with preterm infants, but there was no significant difference in Pocket depth (P=0.57) and GI (P=0.51) between the studied groups.

There is a relationship between some maternal periodontal and dental health indicators and PTBs signifying that elimination of any oral sources of inflammation may reduce the risk of premature birth.