Evaluation of the Effect of the Addition of Hydroxyapatite on Selected Mechanical and Tribological Properties of a Flow-Type Composite

Abstract

(1) Background: The aim of the study was to determine the effect of modification with sintered hydroxyapatite (HAp) on selected mechanical and tribological properties of a flow-type composite. (2) Methods: Samples in the shapes of cuboidal beams (n = 120) and cylinders (n = 120) with the proper dimensions were prepared from a standard flow-type composite and others with the addition of 2% wt., 5% wt., and 8% wt. sintered hydroxyapatite. The bending strength, compression strength, diametral compression strength, impact resistance, hardness, and tribological properties were compared. (3) Results: In all cases, it was established that an increase in the amount of HAp caused a reduction in the bending, compression, and diametral compression strength. Increasing the amount of added HAp also reduced the impact strength, hardness, and wear resistance. However, the differences were statistically insignificant. (4) Conclusions: The addition of hydroxyapatite to a flow-type composite material worsened its mechanical and tribological properties; however, the obtained values were acceptable with 2% wt. and 5% wt. HAp.

An Evaluation of the Mechanical Properties of a Hybrid Composite Containing Hydroxyapatite

“…In the case of impact tests, no statistically significant differences were found between the groups. The obtained results approximated 0.07 J/cm 2 , which is lower than those observed for flow composites [ 44 ].…”

Selected Mechanical Properties of Dental Hybrid Composite with Fluorine, Hydroxyapatite and Silver Fillers

“…Their addition as composite fillers deteriorates the flexural strength of resin materials [10,20,39]. This effect can be explained by low dispersion and insufficient interaction between calcium phosphate-based fillers and the resin [9,19,38]. Research also confirms the relationship between the use of different filler particle sizes and the mechanical properties of dental composites [10,20,39].…”

“…In recent years, research has been focused on the modification of dental composites in order to obtain the best possible mechanical properties and aesthetics [15][16][17]. Various calcium phosphates have been added to these materials, such as hydroxyapatite (HAp) [10,[18][19][20][21], amorphous calcium phosphates (ACP) [22][23][24], tetracalcium phosphate (TTCP) [25,26] and anhydrous dicalcium phosphate (DCPA) [27,28]. The interest of the researchers in calcium phosphates can be explained by their outstanding bioactive properties, especially those of hydroxyapatite (HAp or HA).…”