Real-time monitoring of the pH microenvironment at the interface of multispecies biofilm and dental composites

Anh Tuan Nguyen, Subir Goswami, Jack Ferracane, Dipankar Koley

Research output: Contribution to journalArticlepeer-review

Abstract

Bacterial-mediated local pH change plays an important role in altering the integrity of resin dental composite materials in a dynamic environment such as the oral cavity. To address this, we developed a 300-μm-diameter, flexible, solid-state potentiometric pH microsensor capable of detecting and quantifying the local pH microenvironment at the interface of multispecies biofilm and dental resin in real time over 10 days. We used fluorinated poly(3,4-ethylenedioxythiophene) as the back contact in our newly developed pH sensor, along with a PVC-based ion-selective membrane and PTFE-AF coating. The high temporal resolution pH data demonstrated pH changes from 7 to 6 and 7 to 5.8 for the first 2 days and then fluctuated between 6.5 to 6 and 6 to 5.5 for the remaining 8 days with the resin composite or glass slide substrate respectively. We could observe the fluctuations in pH mediated by lactic acid production within the biofilm and the re-establishment of pH back to 7. However, acid production started to overwhelm buffering capacity with the continuous feed of sucrose cycles and reduced the local pH nearer to 5.5. No such changes or fluctuations were observed above the biofilm, as the pH remained at 7.0 ± 0.2 for 10 days. The localized real-time monitoring of the pH within the biofilm showed that the pH shift underneath the biofilm could lead to damage to the underlying material and their interface but cannot be sensed external to the biofilm.

Original languageEnglish (US)
Article number339589
JournalAnalytica Chimica Acta
Volume1201
DOIs
StatePublished - Apr 8 2022
Externally publishedYes

Keywords

  • Biofilm
  • Dental materials
  • Ion-selective electrode
  • pH sensors

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

Fingerprint

Dive into the research topics of 'Real-time monitoring of the pH microenvironment at the interface of multispecies biofilm and dental composites'. Together they form a unique fingerprint.

Cite this