The relationship between maternal periodontal disease and preterm low birth weight / 口腔疾病防治

@# Preterm low birth weight newborns are prone to complications during growth and development, such as growth retardation and infectious diseases, and the mortality rate of high-risk infants is higher than that of healthy newborns. Epidemiological data show that periodontal disease in pregnant women is correlated with preterm low birth weight. Periodontal disease in pregnant women is one of the risk factors for adverse pregnancy outcomes, such as  preterm   low birth weight. This paper addresses the correlation between maternal periodontal disease and  preterm  low birth weight, the influence of periodontal treatment on the incidence of preterm  low birth weight, and premature birth caused by maternal periodontal disease. The mechanism of infant weight is reviewed. The results of this review show that the current studies confirm the correlation between maternal periodontal disease and  preterm low birth weight. However, the causal relationship between maternal periodontal disease and preterm  low birth weight is not fully elucidated, and the specific mechanism and approach are not clear. A possible mechanism is that periodontal pathogens in pregnant women pass through the placental barrier to influence pregnancy outcomes. Therefore, more in-depth research is needed on the specific mechanism, approach, intervention and treatment based on the relationship between these two factors.

The blocking effect and abrasion resistance of hydroxyapatite with different particle sizes and morphologies for dentinal tubules / 口腔疾病防治

Objective@#To study the blocking effect and abrasion resistance of hydroxyapatite (HA) with different particle sizes and morphologyies on dentinal tubules from the qualitative and quantitative aspects. @*Methods @# Dentin discs were etched and divided into 4 groups randomly: 20 nm HA group; 30 nm HA group; 12 μm HA group; control group (without any experimental treatment). Each group was brushed with correspondent materials for 7 days. Then, the dentin disk was divided into two parts, the one was detected by the scanning electron microscopy (SEM); the other was observed by SEM after toothbrush abrasion test. The Image-Pro Plus 6.0 image analysis software was used to calculate the plugging rate of dentinal tubules. @*Results @#SEM showed that the blockage is granular, the plugging rate of the dentinal tubules were about 82% to 96%. 30 nm HA group (short rod) range the first in the average plugging rate, followed by the 20 nm HA group (needles) and 12 μm HA group (spherical). After mechanical brushing for 7 days, SEM images showed that deposited layer in each group was smooth and compact, and more than 63% of the tubules still had been blocked. @* Conclusion @#HA with different particle sizes and morphologies had good plugging effect and abrasion resistance on dentine tubules. The blocking effect of HA was affected not only by particle size but also by the morphology.