Flexural properties of contemporary bioactive restorative materials: Effect of environmental pH
Document Type
Article
Publication Date
1-1-2023
Abstract
This study investigated the effects of environmental pH on the flexural properties of ion-releasing restorative materials (IRMs), including giomer (Beautifil-Bulk Restorative -BB), alkasite (Cention N -CN), bioactive composite (Activa -AB) and resin-modified glass ionomer (Riva Light Cure -RV) restoratives. A bio-inert resin-based composite (Filtek Bulk-fill Posterior -FB) served as the control. Stainless steel molds were used to fabricate 40 beam-shaped specimens (12mm x 2mm x 2mm) for each material. The specimens were finished, measured, and randomly distributed into four groups (n=10) and immersed in aqueous solutions of pH 3.0, pH 5.0, pH 6.8, and pH 10.0 at 37oC for 28 days. Specimens were then subjected to a uniaxial three-point bending flexural test with a load cell of 5 KN and a fixed deformation rate of 0.5 mm/ min until fracture occurred. Flexural modulus and strength were statistically analyzed using analysis of variance/Dunnet T3's test (p=0.05). Mean flexural modulus varied from (2.40 +/- 0.41 to 9.65 +/- 1.21 GPa), while mean flexural strength ranged from (21.56 +/- 2.78 to 163.86 +/- 13.13 MPa). Significant differences in flexural properties were observed among the various pH values and materials. All materials immersed in artificial saliva (pH 6.8) presented the highest flexural properties, except AB. The flexural strength of AB was significantly better when exposed to acidic environments. FB had better flexural properties than IRMs after exposure to a range of environmental pH values.
Keywords
Composite Resins, Dental Materials, Flexural Strength, Hydrogen-Ion Concentration, Materials Testing, Surface Properties, Water
Divisions
restoreden
Funders
None
Publication Title
Operative Dentistry
Volume
48
Issue
1
Publisher
NLM (Medline)
Publisher Location
INDIANA UNIV SCHOOL DENTISTRY, ROOM S411, 1121 WEST MICHIGAN ST, INDIANAPOLIS, IN 46202-5186 USA