Influence of effects of professional oral care on oral microbiota in elderly individuals receiving gastrostomy tube feeding

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  • 胃ろう増設高齢者における口腔ケアの与える影響に関する研究

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Abstract

The number of patients fed by use of a gastrostomy tube has increased along with the aging of society. Gastrostomy tube feeding has been reported to be associated with pathogenic colonization, which is inhibited by indigenous microbiota. However, the effects of professional oral care on the indigenous oral microbiota remains to be elucidated. The aim of this study was to characterize oral microbiota in elderly individuals receiving gastrostomy tube feeding and evaluate the effects of professional oral care. Tongue coating samples were obtained from the subjects, then terminal restriction fragment length polymorphism（T-RFLP）analysis was performed using 16S rRNA gene amplification. In T-RFLP analysis, major T-RFs of around 233 bp（corresponding to Rothia species）and 308 bp （corresponding to Streptococcus species）were detected among the T-RFLP patterns of all sample（s 5.5-27.4% and 2.0- 56.0%, respectively）after digestion with HaeⅢ. Furthermore, the proportions of Streptococcus and Rothia species in subjects who had received professional oral care were higher than in those who did not, while subsequent professional oral care in the latter group of subjects improved those proportions. Our findings suggest that professional oral care changes the oral ecosystem in regard to indigenous microbiota in elderly individuals receiving gastrostomy tube feeding.

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