Evidence map›Paper›PMID 34505401›Full record

ArticleClinical and experimental dental research2022

The effects of cigarette smoking on the salivary and tongue microbiome.

Nao Suzuki, Yoshio Nakano, Masahiro Yoneda, Takao Hirofuji, Takashi Hanioka

Open access · goldAbstract read
In one paragraph

Article in Clinical and experimental dental research, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed, 1 pooled it
5.4field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

33 citing papers in PubMed, 1 synthesis or guideline pooled it, 42 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 1 country.

Nao SuzukiDepartment of Preventive and Public Health Dentistry, Fukuoka Dental College, Fukuoka, Japan.ORCID 0000-0002-2569-2846
Yoshio NakanoDepartment of Chemistry, Nihon University School of Dentistry, Tokyo, Japan.
Masahiro YonedaDepartment of General Dentistry, Fukuoka Dental College, Fukuoka, Japan.ORCID 0000-0002-9418-1222
Takao HirofujiDepartment of General Dentistry, Fukuoka Dental College, Fukuoka, Japan.
Takashi HaniokaDepartment of Preventive and Public Health Dentistry, Fukuoka Dental College, Fukuoka, Japan.
Fukuoka Dental College · JPNihon University · JP

Funding

JSPS KAKENHI 19K10433the Oral Medicine Research Center of Fukuoka Dental College
6 · The paper itself

Abstract

objectivesIt has been suggested that smoking affects the oral microbiome, but its effects on sites other than the subgingival microbiome remain unclear. This study investigated the composition of the salivary and tongue bacterial communities of smokers and nonsmokers in periodontally healthy adults.

methodsThe study population included 50 healthy adults. The bacterial composition of resting saliva and the tongue coating was identified through barcoded pyrosequencing analysis of the 16S rRNA gene. The Brinkman index (BI) was used to calculate lifetime exposure to smoking. The richness and diversity of the microbiome were evaluated using the t-test. Differences in the proportions of bacterial genera between smokers and nonsmokers were evaluated using the Mann-Whitney U test. The quantitative relationship between the proportions of genera and the BI was evaluated using Pearson's correlation analysis.

resultsThe richness and diversity of the oral microbiome differed significantly between saliva and the tongue but not between smokers and nonsmokers. The saliva samples from smokers were enriched with the genera Treponema and Selenomonas. The tongue samples from smokers were enriched with the genera Dialister and Atopobium. The genus Cardiobacterium in saliva, and the genus Granulicatella on the tongue, were negatively correlated with BI values. On the other hand, the genera Treponema, Oribacterium, Dialister, Filifactor, Veillonella, and Selenomonas in saliva and Dialister, Bifidobacterium, Megasphaera, Mitsuokella, and Cryptobacterium on the tongue were positively correlated with BI values.

conclusionsThe saliva and tongue microbial profiles of smokers and nonsmokers differed in periodontally healthy adults. The genera associated with periodontitis and oral malodor accounted for high proportions in saliva and on the tongue of smokers without periodontitis and were positively correlated with lifetime exposure to smoking. The tongue might be a reservoir of pathogens associated with oral disease in smokers.

Indexed as

Cigarette SmokingMicrobiotaPeriodontitisAdultBacteriaHumansRNA, Ribosomal, 16STongueRNA, Ribosomal, 16S16S rRNA gene sequencingcigarette smokingoral microbiomesalivatongue

Identifiers

PMID34505401
PMCPMC8874080
OpenAlexW3198549115

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.