Abstract
Although fiber-reinforced composites are commonly used in dental practice, whether fiber-reinforced crowns and fixed partial dentures can be used as definitive prostheses remains to be determined. This study used scanning electron microscopy to evaluate the load-bearing capacity of non-reinforced and fiber-reinforced composite (FRC) molar crowns prepared by computer-aided design/computer-aided manufacturing (CAD/CAM). The crowns were fabricated from three empirical FRC blocks, one empirical composite block, and one commercial ceramic block. The FRC resin was prepared by mixing BaO silicate particles, E-glass fiber, and dimethacrylate resin. Specimens were divided into five groups (n = 10), differing in the amounts of filler, resin, and fiber. Crowns were statically loaded until fracture. One-way analysis of variance and Tukey's post hoc multiple comparison tests were used for statistical analyses. The groups showed significant differences in load-bearing capacity; empirical bidirectional FRC resin blocks had the highest capacity, while commercial ceramic blocks had the lowest capacity. Molar crowns formed from FRC resin blocks had higher load-bearing capacity compared to non-reinforced composite resin and ceramic blocks. These results show that fiber reinforcement increased the load-bearing capacity of molar crowns.
Highlights
Due to higher expectations regarding esthetic outcomes, tooth-colored and metal-free restorations have been introduced
Preparation Fifty crowns were fabricated in the laboratory; the specimens were divided into five groups (n = 10), i.e., three fiber-reinforced composite (FRC), one non-reinforced composite, and one commercial ceramic block
One-way analysis of variance indicated that the groups differed significantly in load-bearing capacity
Summary
Due to higher expectations regarding esthetic outcomes, tooth-colored and metal-free restorations have been introduced. All-ceramic crowns are preferred due to their outstanding esthetic outcomes, biocompatibility, and durability.[1,2] abrasive wear of the opposing natural teeth and the high cost of all-ceramic crowns limit their use. The failure rate due to brittle catastrophic fracture is relatively high.[3,4]. The use of composite resin in posterior teeth has increased,[5,6] with the development of reinforced composite resins. Fiber-reinforced composites (FRCs) have been used for replacement of missing teeth and conventional dental restorations.[7,8,9] The advantages of FRCs include high translucency, high bonding strength, and ease of repair.[10,11]
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