Acid-Assisted Consolidation of Silver Alloys for Direct Fillings
F Eichmiller, Kathleen M. Hoffman, A A. Guiseppetti, M M. Wray, R J. Avers
Silver-rich metal powders cold-welded by consolidation have been investigated as possible direct dental filling material. The surface of the silver powder must undergo an acid treatment to remove existing contaminants and prevent formation of new surface contaminants during consolidation. This study was designed to investigate the effect of the acid treatment on the strength of the consolidated alloy, its reactivity with the surrounding tooth structure, and its reactions with certain cavity liners. This study investigated the effects of pH and concentrations of fluoboric acid on the flexural strength of silver powder consolidated into rectangular beams in a partial 4 x 4 design. The study also assessed, by visible and scanning electron microscopy, what effect the acid-treated powders had on dentin that had been pre-coated with different cavity liners. Mean flexural strengths for beams consolidated using dental hand instruments were in the range (77.0 + 9.28) Mpa to (166.1 + 17.6) Mpa, where the quoted uncertainties are standard uncertainties (I.e., one standard deviation estimates). ANOVA indicated that fluoboric acid pH was highly significant (p
, Hoffman, K.
, Guiseppetti, A.
, Wray, M.
and Avers, R.
Acid-Assisted Consolidation of Silver Alloys for Direct Fillings, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD
(Accessed December 10, 2023)