Intraoral pH measurement of carious lesions with qPCR of cariogenic bacteria to differentiate caries activity.

Abstract:

OBJECTIVES:A low pH environment is created by cariogenic bacteria. This study was aimed to measure pH of carious lesions intraorally using a micro-pH sensor, and assess predominant acid-producing cariogens by qPCR to differentiate caries activities. METHODS:103 dentine lesions classified as active or arrested caries based on the clinical and radiological examinations were collected from patients after intraoral measurement of the lesion surface pH using a micro-pH sensor. Quantitative detection of genomic DNA copies of target cariogenic bacteria (mutans streptococci and Lactobacillus spp.) in each lesion was performed using real-time PCR. Correlation between the pH ranges and the number of bacterial species was examined by Spearman test. RESULTS:50 samples were diagnosed as active and 53 as arrested lesions. Statistically significant difference was observed on average surface pH value between active and arrested lesions (p<0.05). Prevalence of Lactobacillus spp. was higher in active lesions than in arrested lesions (76% vs. 58% of samples, respectively). When the carious lesions were categorised into four different pH ranges (up to 5.5, from 5.6 to 5.8, from 5.9 to 6.1 and 6.2 or above), increased prevalence of Lactobacillus spp. was observed with decrease of pH levels. A significant negative relationship was found between pH value and number of Lactobacillus spp. (r=-0.209, p<0.05) but no such correlation was found for mutans streptococci. CONCLUSIONS:Intraoral pH measurement might be clinically useful to determine acidity of the local environment of carious lesions as one aspect of the caries activity assessment. CLINICAL SIGNIFICANCE:The population of certain bacteria may indicate activity of carious lesions. Intraoral pH measurement of the carious lesions using a micro-pH sensor may be a clinically feasible method for assessment of lesion acidity.

journal_name

J Dent

journal_title

Journal of dentistry

authors

Kuribayashi M,Kitasako Y,Matin K,Sadr A,Shida K,Tagami J

doi

10.1016/j.jdent.2011.12.013

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

222-8

issue

3

eissn

0300-5712

issn

1879-176X

pii

S0300-5712(11)00321-6

journal_volume

40

pub_type

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