We are using cookies to implement functions like login, shopping cart or language selection for this website and to create anonymized statistical reports of the usage. You will find more information in our privacy policy. By continuing to use our website, you agree to this. Yes, I agree
International Poster Journal of Dentistry and Oral Medicine
Login:
username:

password:

Plattform:

Forgotten password?

Registration

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