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NYU dental researchers find link between C-section delivery and higher risk of cavities in newborns
August 24, 2005A new study by NYU dental researchers suggests that women with dental caries (cavities) who deliver Caesarean-section babies should pay special attention to their newborns' oral health.
The NYU researchers focused on a caries-causing bacterium that mothers with caries transmit to their newborns. Known as Streptococcus mutans, the bacterium grows on tooth surfaces and in crannies between teeth just above the gum line, where it multiplies and converts foods, especially those containing sugar and starch, into acids that break into the tooth surface.
NYU's study is the first to distinguish between bacterial infection in C-section and vaginally-delivered babies. The findings suggest that mothers who have dental caries should inform their family dentists if they had a C-section delivery because of the potentially higher risk that the child will also develop caries, said the study's principal investigator, Dr. Yihong Li, an Associate Professor of Basic Science and Craniofacial Biology at NYU College of Dentistry.
"Vaginally-delivered infants offer oral bacteria a less hospitable environment," Dr. Li explained. "They develop more resistance to these bacteria in their first year of life, in part because of exposure to a greater variety and intensity of bacteria from their mothers and the surrounding environment at birth. C-section babies have less bacterial exposure at birth, and therefore less resistance."
Mothers in Dr. Li's study who delivered C-section babies had high levels of Streptococcus mutans infection, and caries on an average of one-third of their teeth. A majority had an annual family income of $10,000 or less - a potential barrier to accessing dental care - and a history of sexually transmitted disease. These cofactors contributed to an earlier onset of bacterial infection, Dr. Li said.
The study followed a predominantly African-American group of women from an inner-city area of Birmingham, Alabama, beginning in their third trimester of pregnancy. There were 127 vaginal and 29 C-section births.
Further study is needed to determine if C-section births can be linked to earlier acquisition of this and other oral bacteria in a broader cross-section of the population, and if a higher incidence of caries follows. The results of Dr. Li's study add to a growing body of knowledge about a possible link between a mother's level of tooth decay and her newborn's health that was identified by NYU dental researchers in an earlier study of predominantly low-income African-American women in Birmingham, which found that pregnant women with high levels of oral bacteria associated with dental caries are at risk for delivering preterm low birth weight babies. Published last February in the Journal of Periodontology, that study was led by Dr. Ananda P. Dasanayake, an Associate Professor of Epidemiology & Health Promotion. Dr. Dasanayake is among a group of researchers in the U.S. and abroad who also have reported that periodontal diseases in pregnant women may be a risk factor for delivering preterm low birth weight babies.
Dr. Li's coinvestigators on the C-section study were Dr. Dasanayake; Dr. Page W. Caufield, a Professor of Cariology and Operative Dentistry at NYU College of Dentistry; Dr. Howard W. Wiener, a Research Assistant at the School of Public Health of the University of Alabama at Birmingham; and Dr. Sten H. Vermund, a Professor of Epidemiology at the University of Alabama.
New York University
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