International Poster Journal of Dentistry and Oral Medicine
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Int Poster J Dent Oral Med 17 (2015), No. 4     15. Dec. 2015
Int Poster J Dent Oral Med 17 (2015), No. 4  (15.12.2015)

Poster 932, Language: English


Protective Buffer Capacity of Restorative Dental Materials in Vitro
Fuß, Markus / Attin, Thomas / Noack, Michael J.
Objectives: The objective of this study was to investigate the buffer capacity of typical and experimental restorative materials during a carious and intrinsic erosive attack.
Methods: Samples with a small cavity (130 µl) were milled out of composites, a compomer, a giomer, a pulp capping liner, a glass ionomer cement, a PMMA block, extracted teeth and an experimental dual-curing composite containing a bismuth-doped bioactive glass using CEREC MC XL (Sirona) to create a standardized surface. 80 µl of acid (lactic acid with a pH of 4.5 or hydrochloride acid with a pH of 2.6) was added. The change of pH was measured over a period of 12 minutes using a calibrated pH-electrode (In Lab nano, Mettler Toledo). Before and after this test the surface of each sample was electron-microscopically analyzed.
Results: After the HCl acid attack the compomer, giomer and the glass ionomer cement showed some buffering effect while composites and PMMA had no relevant buffering effect. The experimental bioactive glass-containing composite buffered most effectively and performed similar to the positive control group (liner). Following the lactic acid attack smaller pH changes were measured as compared to the HCl. However a neutral pH was induced by the majority of the tested materials. The electron microscopy showed transformation in the surface of all materials after an acid attack
Significance: The results indicate that bioactive agents can increase the pH in vitro and therefore may be of advantage during an acid challenge.

Keywords: buffer capacity, pH, secondary caries

Conference/Exhibition:
IADR Genral Session
11.-14. March 2015
Boston