Abstract
BackgroundNon carious cervical lesions associated to muscle hyperfunctions are increasing. Microhybrid resin composites are used to restore cervical abfractions. The purpose of this study was to investigate if resin composites modify tooth plaque, inducing an increment of cariogenic microflora and evaluate their effect, in vivo and in vitro, against S. mutans.Material and MethodsEight abfractions were restored with two microhybrid resin composites (Venus, Heraeus-Kulzer® and Esthet-X, Dentsply®), after gnatological therapy, in three patients with muscle hyperfunctions. For each abfraction three samples of plaque were taken from the cervical perimeter: before the restoration, one week and three months after restoration. The samples were evaluated both by traditional microbiological methods and by Polymerase Chain Reaction (PCR). In vitro, disk-shaped specimens of the two composites were prepared to estimate the effects against pre-cultured S. mutans, after incubation at 37°C for 24h and assessed by a turbidimetric technique.ResultsIn vivo no differences were found in plaque growth, for all samples, before and after restoration with both composites; in vitro, instead, a significant reduction of S. mutans growth was found between specimens of two composites (Mann-Whitney U-test p>0,06).ConclusionsIn this study a relevant consideration was elicited: composite materials, in vivo, do not modify plaque composition of non carious cervical lesions to a potential cariogenic plaque. Key words:Abfraction, restoration, S. mutans, composite, class V.
Highlights
Non carious cervical lesions are a well known problem for every dentist, but which is not always simple to be solved
Abfractions, non-carious cervical lesions determined by bite overloading on teeth, are lesions which can be found frequently by dentists and patients are more worried about both aesthetics and symptomatology
The results obtained revealed that restorations with composite materials do not modify the state of bacterial microflora of the non carious cervical lesions observed
Summary
Non carious cervical lesions are a well known problem for every dentist, but which is not always simple to be solved. Cervical lesions are characterized by a loss of mineralized dental tissue, in the zone of cement-enamel junction, with no carious process. Abrasions are due to mechanical forces and they consist of a loss of cervical dental tissue, because of repeated and wrong friction of objects or materials on the surface of the teeth. Among exogenous factors there are soft drinks; in particular, juices and fizzy drinks are the most involved in erosion Such drinks are rich in phosphoric acid and overall of citric acid that are able to chelate, and to dissolve, calcium ions of dental tissues. Conclusions: In this study a relevant consideration was elicited: composite materials, in vivo, do not modify plaque composition of non carious cervical lesions to a potential cariogenic plaque
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