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Quintessence Publishing: Journals: OHPD


Oral Health & Preventive Dentistry

Edited by Anton Sculean, Poul Erik Petersen, Avijit Banerjee

ISSN (print) 1602-1622 • ISSN (online) 1757-9996


July/August 2018
Volume 16 , Issue 4

Pages: 369–373
PMID: 29335687
DOI: 10.3290/j.ohpd.a39691
Share Abstract:

Structure of the Bacterial Community in Different Stages of Early Childhood Caries

Marcos Ximenes / Rafael Dutra de Armas / Thaisa Cez.ria Triches / Mariane Cardoso / Ricardo de Souza Vieira

Purpose: To characterise in vivo the structure of bacterial communities in decayed and sound primary teeth.

Materials and Methods: Samples of biofilms were collected from three groups of patients with complete and exclusively primary dentition (n = 45): G1: sound teeth (n = 15); G2: enamel lesion (n = 15); G3: dentin lesion (n = 15). DNA was extracted (CTAB 2%) from the biofilm, the partial 16S rRNA gene was amplified with Bacteria Universal Primers (BA338fGC - UN518r) and subjected to DGGE (denaturing gradient gel electrophoresis). Multidimensional scaling and ANOSIM (analysis of similarity) were employed to determine the structure of the bacterial communities. The amplicon richness was determined by averaging amplicons, with the differences between treatments determined with ANOVA, while means were compared using Tukey’s test (p < 0.05).

Results: Compared to sound teeth, a greater variety of bacterial communities was found in decayed teeth. Despite the differences between the bacterial communities of sound teeth and decayed teeth, the Venn diagram showed that the samples had 38 amplicons in common. Greater amplicon richness was observed in samples of decayed teeth (enamel: 20.5 ± 2.7; dentin: 20.1 ± 2.8) compared with the sound samples (12.0 ± 4.3) (p <0.05), indicating enhanced growth for specific groups of bacteria on decayed teeth.

Conclusion: Although there is less bacterial diversity on sound than ECC-decayed teeth, the bacterial communities are very similar.

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