Compressive Fatigue Behavior of Dental Restorative Composites

Abstract

The purpose of this study was to investigate the compressive fatigue behavior of five dental composites. Cylindrical specimens of 8 mm length and 4 mm diameter were made according to manufacturers' recommendations and stored for two weeks in distilled water at 37℃. Compressive fracture strength was measured, and subsequently fatigue tests at 10 Hz frequency were carried out in distilled water. Compressive fatigue strength was thereby obtained using the staircase method for 10 5 cycles (n＝17) under sinusoidal loading. Acquired data for compressive fracture strength were analyzed using ANOVA and Weibull statistics. Among the dental composites examined, Filtek ® Z250 exhibited the highest fatigue strength. This seemed to be due to the superior matrix properties coupled with a specific filler type at the highest weight％/volume％ ratio. In addition, fracture mechanisms of the composites were examined.

Improved performance of Bis-GMA dental composites reinforced with surface-modified PAN nanofibers

“…Hence, an impressive stress transfer from the resin to the filler and improved mechanical properties of the final composite have occurred. In another research by Lia et al Bis-GMA/TEGDMA monomers were grafted on the surface of hydroxylapatite whiskers as a filler of Bis-GMA/TEGDMA dental resin composite which improved the compressive strength of obtained composite [ 19 , 21 , 29 ].…”

The Cracking Behavior of Two Dental Composite Materials Validated through Multifractal Analyzes

“…Although the data given in the literature for compressive strength vary within very wide limits, it is unanimously accepted that all mechanical properties (compressive strength, diametral strength, flexural strength) are better for Filtek Z250 hybrid composite than for Filtek Supreme XT nanocomposite [ 9 , 10 , 11 , 12 ]. Both materials have the same polymer matrix and similar particle loadings but different particle sizes.…”

The Effect of Cyclic Loading on the Compressive Strength of Core Build‐Up Materials

“…Therefore, compressive fatigue was chosen in this study to be evaluated on the selected core build‐up materials. Compressive strength is important for core build‐ups, especially when they are used in the posterior region where high masticatory forces are expected …”

“…Different protocols have been used in studies that investigate fatigue behavior, which perhaps made it difficult to compare these studies due to their different chewing forces, frequency, and the number of cycles . In vitro loading frequency was reported in previous studies to range from 1 to 60 Hz .…”

“…Previous studies used different devices with only a vertical movement to perform a static fatigue test on the specimens. Moreover, the fatigue process used in most of these studies was based on performing 40% to 60% of the initial static compressive force of a given material (ranges from 1000 to 2000 N roughly) . For instance, the 50% fatigue force for a composite will be on average about 1200 N, which is far higher than the mean physiological chewing force (49‐150 N); however, the methods used in the other studies may be useful to find the optimum strength of the materials, despite their irrelevance to the clinical situation.…”