Andrea L Pierce, Amar Kosaraju, Joseph L Gedge, Kraig S Vandewalle
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引用次数: 0
Abstract
Background: The purpose of this in vitro study was to determine the fracture resistance and failure mode of direct cuspal-coverage restorations utilizing fiber-reinforced and non-fiber-reinforced materials.
Materials and methods: Fifty extracted human mandibular third molars were prepared for mesio-occlusal-facial single cuspal-coverage restorations. Ten cuspal-coverage restorations were constructed per group using the following restorative material types: nanofill composite (NC), nanometer-scale, short-fiber-reinforced composite (NS-SFRC), micrometer-scale, short-fiber-reinforced composite (MS-SFRC) dentin base covered with a nanofill composite (MS-SFRC + NC), polyethylene fiber-based leno-weave covered with nanofill composite (PF + NC), and bonded amalgam (AM). After thermocycling and cyclic fatiguing, fracture load testing was performed on the specimens utilizing a universal testing machine. Then, each specimen was examined to determine failure mode. Data were analyzed with a one-way analysis of variance and Tukey's post hoc tests (α = 0.05).
Results: The highest fracture load was found in MS-SFRC + NC group (1112.9 ± 249.3 N), which was significantly greater than all other groups (p < 0.011). The NC group had the lowest fracture load (651.7 ± 228.3 N), but it was not significantly different from NS-SFRC (701.6 ± 209.4 N, p = 0.989), PF + NC (754.7 ± 267.7 N, p = 0.862), or AM (749.3 ± 213.7 N, p = 0.884). The MS-SFRC + NC group had the greatest percentage of adhesive failures (70%), and the AM group had the greatest percentage of cohesive failures (80%). The NS-SFRC group had the greatest percentage of failures of the tooth/restoration complex with periodontal involvement (40%) and both the NC and PF + NC had the greatest percentage of failures of the tooth/restoration complex without periodontal involvement (20%).
Conclusions: The MS-SFRC + NC group had the highest fracture load and was significantly greater than all other groups-which were not significantly different from each other: MS-SFRC + NC > PF + NC = AM = NS-SFRC = NC. The observed fracture mode for the MS-SFRC + NC group was predominantly adhesive, resulting in an overall repairable failure mode.
Clinical significance: Limited research is available evaluating the fracture resistance and failure mode of single cuspal-coverage restorations using fiber-reinforced materials. For enhanced strength in cuspal-coverage composite restorations, a micrometer-scale, short-fiber-reinforced composite dentin base combined with an overlay of an NC may be advantageous. How to cite this article: Pierce AL, Kosaraju A, Gedge JL, et al. Fracture Resistance and Failure Modes of Cuspal-coverage Restorations Using Fiber-reinforced and Non-fiber-reinforced Materials: An In Vitro Study. J Contemp Dent Pract 2025;26(1):4-9.
期刊介绍：
The Journal of Contemporary Dental Practice (JCDP), is a peer-reviewed, open access MEDLINE indexed journal. The journal’s full text is available online at http://www.thejcdp.com. The journal allows free access (open access) to its contents. Articles with clinical relevance will be given preference for publication. The Journal publishes original research papers, review articles, rare and novel case reports, and clinical techniques. Manuscripts are invited from all specialties of dentistry i.e., conservative dentistry and endodontics, dentofacial orthopedics and orthodontics, oral medicine and radiology, oral pathology, oral surgery, orodental diseases, pediatric dentistry, implantology, periodontics, clinical aspects of public health dentistry, and prosthodontics.
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