Comparative Evaluation of Compressive Strength and Flexural Strength of Conventional Core Materials with Nanohybrid Composite Resin Core Material an in Vitro Study

Abstract

Several dental materials have been used for core build-up procedures. Most of these materials were not specifically developed for this purpose, but as a consequence of their properties, have found application in core build-up procedures. Improvements in composites and the development of nanocomposites have led to their use as a core build up material due to their superior mechanical properties, optical properties and ease of handling. However it is not clear if they have better mechanical properties than the conventional core build up materials like amalgam, GIC and dual cure composite core build up material. The strength of the core material is very important and this study was undertaken to compare the mechanical properties of materials used for direct core foundations. The differences between the compressive strength and flexural strength of Filtek Z350 nanocomposite with conventional core build up materials like Amalgam, Vitremer GIC and Fluorocore were tested. Cylindrical plexi glass split molds of dimension 6 ± 1 mm [height] x4 ± 1 mm [diameter] were used to fabricate 15 samples of each core material for testing the compressive strength and rectangular plexi glass split molds of dimension 25 ± 1 mm [length] x 2 ± 1 mm[height] x2 ± 1 mm [width] used for fabricating samples for flexural strength. The samples were stored a water bath at 250 °C for 24 h before testing. The samples were tested using a Universal Instron testing machine. The results of the study showed that Fluorocore had the highest compressive strength and flexural strength followed by Filtek Z350 [nanocomposite] Amalgam had the least flexural strength and Vitremer GIC had the least compressive strength. Thus flurocore and nanocomposite are stronger than other core build up materials and hence should be preferred over other conventional core build up materials in extensively damaged teeth.

Properties of Experimental Dental Composites Containing Antibacterial Silver-Releasing Filler

“…Flexural strength is the only mechanical property specified by the ISO 4049 standard for composite restorative materials, which requires minimal values of 80 MPa for occlusal tooth surface restorations and 50 MPa for others [ 62 ], so all investigated materials meet these requirements. The obtained results were additionally comparable to other materials with similar matrix or filler concentrations [ 4 , 106 , 107 , 108 ]. A parallel situation was noted for flexural moduli [ 109 ], the values of which are not defined by the standard and may be diversified for different clinical situations.…”

“…One of the strategies allowing reconstruction of the teeth structure is using direct restorative materials, which are shaped intraorally to create restorations directly in teeth cavities [ 3 ]. Currently, the most common of them are photopolymerizable resin-based composites, introduced few decades ago as a substitute for amalgams [ 4 ]. This type of material is also considered to be the most prospective, which has resulted in a growing number of new products on the market and numerous investigations in this area.…”

Effect of different bleaching regimens on the flexural strength of hybrid composite resin

“…Flexural strength (FS), defined as the failure stress of a material as measured in bending, is generally considered a meaningful mechanical property for brittle materials that are much weaker in tension than in compression. [ 9 ]…”

Effect of Silanized Silicon Dioxide and Titanium Dioxide Nanoparticles Loading on the Compressive Strength of Prepared Composite Core Material

“…These results are in agreement with other studies that found no statistically significant difference in the compressive strength results of nanofilled and nanohybrid commercial composite types (18,19) . Another study found that nanocomposite showed higher compressive strength values than dental amalgam and resin modified glass ionomer (20) . From the above results, it could be emphasized the success of the experimental nanocomposite to be used as dental core material in terms of compressive strength performance.…”