Mechanical properties of composite resin blocks for CAD/CAM

Abstract

This study compared commercial composite resin blocks with one ceramic block for use in computer-aided design/computer aided manufacturing (CAD/CAM). Four composite resins, one composite ceramic, and one feldspar-ceramic block were investigated. Flexural strength (FS), flexural modulus (FM), and Vickers hardness (VH) were determined under three conditions: dry storage; immersion in water at 37°C for 7 days; and immersion in water at 37°C for 7 days followed by 10,000 thermocycles. After dry storage, FS ranged from 127 to 242 MPa, FM from 9.6 to 51.5 GPa, and VH from 64 to 455. Two-way ANOVA was performed for FS, FM and VH followed by Tukey's multiple comparison (α<0.05). Results demonstrated that the materials degraded after water immersion and thermocycling, but their properties were within the acceptable range for fabrication of single restorations according to the ISO standard for ceramics (ISO 6872:2008).

Toothbrushing alters the surface roughness and gloss of composite resin CAD/CAM blocks

“…This greater wear resistance might be attributed to the strong ceramic network structure and greater hardness values of these materials 18) . These findings are consistent with a recent study that reported the surface hardness of ENA and VIT was relatively high when compared to the other materials tested 6) . The BLO and TEL samples showed a significant increase in Ra after 40k toothbrushing cycles.…”

“…The BLO samples (Fig. 1-A1) demonstrated large and small spherical filler particles that have been reported to be silica and zirconium silicate, respectively 6) . After 40k toothbrushing cycles, wide scratches were observed on the large silica particles and a large amount of small pits resulting from filler particle exfoliation were seen ( Fig.…”

“…Newly available CAD/ CAM composite resin blocks are fabricated by highpressure/high-temperature polymerization resulting in improved mechanical properties 4,5) . The flexural properties of composite resin CAD/CAM blocks were reported to be comparable to those of ceramic blocks and were suggested to be suitable for single premolar crown restorations 6) . However, a restoration in a patient's mouth is subjected to wear from several factors, such as food and daily cleaning.…”

Surface roughness and gloss of current CAD/CAM resin composites before and after toothbrush abrasion

“…CAD/CAM-produced composite resin premolar crowns were approved by the Japanese social insurance system in early 2014. However, there are few studies that have utilized these newly developed CAD/CAM composite blocks 12,13) . Additionally, there is no information available regarding their gloss and surface roughness.…”

Evaluati̇on of Physi̇cal and Opti̇cal Properti̇es of Hybri̇d Cad/Cam Materi̇als

“…10000 termal döngü uyguladıkları CAD/CAM bloklarında sertliğin azaldığını ifade etmişlerdir. 13 Ayrıca malzeme içeriğindeki rezin yapı azalıp doldurucu miktarı arttıkça yüzey sertliği artmaktadır. Koizumi ve ark.…”