Comparison of Fracture Resistance and Mode of Fracture of Ultraconservative and Conventional Fiber Posts: An In Vitro Study

design, post placement, and substance loss.A lot of research has been done on the mechanical properties, effects of resin luting agents, post design, post length, and performance of different fiber-reinforced composite (FRC) post core systems. 7rior studies 8-10 have highlighted the significant influence of altering the diameter of the post on the fracture resistance of metalpost-restored teeth.reported that modifying the post's diameter had a substantial impact on fracture resistance. Aditionally, a study by Sinha investigated the fracture resistance and failure patterns of size two fiber posts, known as EasyPosts.10 The results suggested that EasyPosts should not be considered a straightforward and effective solution for restoring IntroductIonAs a result of caries activity, prior restorations, trauma, and/or the endodontic treatment itself, endodontically treated teeth (ETTs) typically suffer substantial tooth structure loss, which weakens the tooth. 1 Before a crown or cast partial denture can be put in place, these teeth must first be restored using a post and core to prevent further decay and provide retention to the core. 2 A suitable post system must meet the needs of both the restoration and the tooth.However, the process of preparing the post space inevitably results in the removal of dentin from the root, compromising the structural integrity of the remaining tooth. 3Consequently, highly conservative fiber posts such as EasyPost and Hi-Rem, featuring smaller diameters, have recently emerged in the market.These posts claim to preserve radicular dentin while simultaneously enhancing the fracture resistance of the tooth. 4asyPost (Dentsply, Ballaigues, Switzerland) utilizes a high density of unidirectional glass fibers to provide strength and flexibility for restorations, replicating the stress distribution found in healthy teeth. 5This characteristic helps to prevent fractures and fissures.On the other hand, the Hi-Rem post (Overfibers, Bologna, Italy) has been introduced and reported to possess strong bond strength.It incorporates soft polymer microfibers within the zirconia glass fiber post, offering additional reinforcement to the tooth structure. 6he longevity of survival in endodontically treated teeth (ETTs) with post and cores relies on various factors, including ferrule 1-