Reinforcement of experimental composite materials based on amorphous calcium phosphate with inert fillers.

Danijela Marovic, Zrinka Tarle, Karl-Anton Hiller, Rainer Müller, Martin Rosentritt, Drago Skrtic, Gottfried Schmalz

Journal: Dental materials : official publication of the Academy of Dental Materials 2016;30(9):1052-60

PMID: 25015877

Full Text on Elsevier Science View on PubMed

Abstract

OBJECTIVES

The aim of this study was to examine the influence of the addition of glass fillers with different sizes and degrees of silanization percentages to remineralizing composite materials based on amorphous calcium phosphate (ACP).

METHODS

Four different materials were tested in this study. Three ACP based materials: 0-ACP (40 wt% ACP, 60 wt% resin), Ba-ACP (40 wt% ACP, 50 wt% resin, 10 wt% barium-glass) and Sr-ACP (40 wt% ACP, 50 wt% resin, 10 wt% strontium-glass) were compared to the control material, resin modified glass ionomer (Fuji II LC capsule, GC, Japan). The fillers and composites were characterized using scanning electron microscopy. Flexural strength and modulus were determined using a three-point bending test. Calcium and phosphate ion release from ACP based composites was measured using inductively coupled plasma atomic emission spectroscopy.

RESULTS

The addition of barium-glass fillers (35.4 (29.1-42.1) MPa) (median (25-75%)) had improved the flexural strength in comparison to the 0-ACP (24.8 (20.8-36.9) MPa) and glass ionomer control (33.1 (29.7-36.2) MPa). The admixture of strontium-glass (20.3 (19.5-22.2) MPa) did not have any effect on flexural strength, but significantly improved its flexural modulus (6.4 (4.8-6.9) GPa) in comparison to 0-ACP (3.9 (3.4-4.1) GPa) and Ba-ACP (4.6 (4.2-6.9) GPa). Ion release kinetics was not affected by the addition of inert fillers to the ACP composites.

SIGNIFICANCE

Incorporation of barium-glass fillers to the composition of ACP composites contributed to the improvement of flexural strength and modulus, with no adverse influence on ion release profiles.

Address: Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Croatia. Electronic address: [email protected].; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Croatia.; Department of Operative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, Germany.; Institute of Physical and Theoretical Chemistry, University of Regensburg, Germany.; Department of Prosthodontics, University Hospital Regensburg, University of Regensburg, Germany.; Dr. Anthony Volpe Research Center, ADA Foundation, Gaithersburg, MD, USA.

DOI: 10.1016/j.dental.2014.06.001