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Chlorhexidine rinsing inhibits biofilm formation and causes biofilm disruption on dental enamel in situ.

Abstract：

OBJECTIVES:This in situ study aims to evaluate the effects of chlorhexidine (CHX) mouth rinsing on biofilm formation and moreover on the disruption of existing mature dental biofilms. METHODS:Biofilms were formed in situ by five volunteers on bovine enamel specimens fixed to individual acrylic splints. For biofilm formation analysis, the volunteers intraorally exposed the splint for 48 h. Mouth rinsing using 10 ml of 0.2% CHX or water as control was performed for 30 s every 12 h. For analysis of biofilm disruption, the biofilm was formed on enamel specimens for 48 h. Then, the first CHX rinse was carried out. A second rinse followed after an additional 12 h, again for 30 s using 10 ml of 0.2% CHX. Biofilm vitality was imaged by fluorescence microscopy after vital fluorescence staining. Additionally, the ultrastructure of the biofilm was examined by transmission electron microscopy. RESULTS:Rinses with 0.2% CHX significantly reduced biofilm formation on enamel. Both biofilm colonization and vitality were dramatically impaired. Moreover, a considerable biofilm disruption induced by the CHX rinses was observed. Remarkably, a single application of CHX to a 48-h mature biofilm causes biofilm ultrastructure alterations and induces a substantial reduction in biofilm thickness and bacterial vitality. CONCLUSIONS:CHX mouth rinses induced a significant inhibition of biofilm formation on native enamel. Furthermore, an important biofilm disrupting effect under in situ conditions was detected. CLINICAL RELEVANCE:CHX rinses could be used as a short-term treatment protocol for biofilm management focused on patients unable to reach adequate oral hygiene.

journal_name

Clin Oral Investig

journal_title

Clinical oral investigations

authors

Martínez-Hernández M,Reda B,Hannig M

doi

10.1007/s00784-020-03250-3

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

3843-3853

issue

11

eissn

1432-6981

issn

1436-3771

pii

10.1007/s00784-020-03250-3

journal_volume

24

pub_type

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