Preprint Article Version 1 This version is not peer-reviewed

Human in situ Study of the Effect of bis(2-methacryloyloxyethyl) Dimethylammonium Bromide Immobilized in Dental Composite on Controlling Mature Cariogenic Biofilm

Version 1 : Received: 8 October 2018 / Approved: 9 October 2018 / Online: 9 October 2018 (04:43:45 CEST)

A peer-reviewed article of this Preprint also exists.

Melo, M.A.S.; Weir, M.D.; Passos, V.F.; Rolim, J.P.M.; Lynch, C.D.; Rodrigues, L.K.A.; Xu, H.H.K. Human In Situ Study of the effect of Bis(2-Methacryloyloxyethyl) Dimethylammonium Bromide Immobilized in Dental Composite on Controlling Mature Cariogenic Biofilm. Int. J. Mol. Sci. 2018, 19, 3443. Melo, M.A.S.; Weir, M.D.; Passos, V.F.; Rolim, J.P.M.; Lynch, C.D.; Rodrigues, L.K.A.; Xu, H.H.K. Human In Situ Study of the effect of Bis(2-Methacryloyloxyethyl) Dimethylammonium Bromide Immobilized in Dental Composite on Controlling Mature Cariogenic Biofilm. Int. J. Mol. Sci. 2018, 19, 3443.

Journal reference: Int. J. Mol. Sci. 2018, 19, 3443
DOI: 10.3390/ijms19113443

Abstract

Cariogenic oral biofilms cause a considerable amount of recurrent dental caries around composite restorations every year, resulting in unprosperous oral health status and expensive restorative treatment for many patients. Quaternary ammonium monomers that can be copolymerized with the current dental resin systems have been increasingly explored for modulation of dental plaque biofilm growth over dental composite surfaces. Here, we investigated the effect of bis(2-methacryloyloxyethyl) dimethylammonium bromide (QADM), against human overlying mature oral biofilms grown intra-orally in human participants for 7 and 14 days, for the first time. Seventeen volunteers wore palatal devices containing composite specimens containing 10% by mass of QADM or a control composite without QADM. After 7 and 14 days, the adherent biofilms were collected for determination of bacterial counts via colony-forming unit (CFU) counts. The biofilm viability, chronological changes, and percentage coverage were also determined by live/dead staining. QADM composites caused a significant inhibition of S. mutans biofilm formation for up to seven days. No difference in the CFU values were found for the 14-day period. Our findings suggest that (1) QADM composite was successful in inhibiting 1-3 day biofilms in the oral environment in vivo; (2) QADM significantly reduced the portion of S.mutans group in a time course where patients at high risk of caries would develop initial enamel carious lesions; and (3) stronger antibiofilm activity is required for the control of mature long-term cariogenic biofilms. These results provide a perspective on the value of integrating bioactive restorative materials with traditional caries management approaches into clinical practice. Contact-killing strategies via dental materials aiming to prevent or at least reduce high numbers of cariogenic bacteria seem to be a promising approach in patients at high risk of recurrence of dental caries around composites.

Subject Areas

antibacterial; biofilm; caries; dental composite; quaternary ammonium monomers; human in situ study

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