Influence of test parameters on in vitro fracture resistance of post‐endodontic restorations: a structured review

Abstract

A structured literature review aimed to elucidate test parameters for in vitro testing of post-endodontic restorations. The literature was digitally searched using MEDLINE, EMBASE, MedPilot and an additional hand search was performed. Two independent researchers assessed the articles in relation to the defined inclusion and exclusion criteria. The literature search revealed 125 abstracts. Sixty-nine studies were included. Fifty-seven per cent of the studies investigated maxillary incisors only. The restorative stage as complex of tooth, post, core, and crown and post-and-core restored specimens without crowns were used most frequently. Fifty-nine per cent of the studies used static loading. Only 15% of the studies performed thermocycling and mechanical loading (TCML). However, the number of thermo- and load cycles varied. The cross-head speed of linear loading after TCML ranged from 0.01 to 150 mm min(-1). The reviewed studies were heterogeneous in test design regarding the used test parameters. A methodological standardization of in vitro testing of post-endodontic restorations is recommended.

Effect of fiber post length and bone level on the fracture resistance of endodontically treated teeth

“…Specimens were also subjected to thermal cycling and mechanical loading before the fracture test in this study because these two regimes are a recognized method to induce fatigue 19) . Traditionally, a reduced bone level around a tooth is believed to worsen its prognosis since it requires only a lower load to bring it to fracture 20) .…”

Microhardness of dual-polymerizing resin cements and foundation composite resins for luting fiber-reinforced posts

“…The fracture resistance and survival probability of post and core restorations depend on several factors such as the post material, luting agent, amount and condition of residual tooth structure, core material, preparation of the tooth for restorative procedures, and characteristics of the fixed restoration. [8][9][10][11][12][13][14] When the cement layer is too thick, the retention of the fiber-reinforced post is significantly decreased. 18 Resin cement thicknesses greater than 100 μm were observed between the interfaces of dentin and fiber-reinforced post at the 1-mm, 4.5-mm, and 8-mm level of the root.…”

“…7 The fracture resistance and survival probability of post and core restorations depend on several factors, such as the amount and condition of residual tooth structure, preparation of the tooth for restorative procedures, and characteristics of the fixed restoration, such as post material, core material, and luting cement. [8][9][10][11][12][13][14] Dual-polymerizing composite resins are widely used in modern adhesive restorative dentistry as both foundation resins and luting cements. 3 Autopolymerizing or light-polymerizing composite resins are also appropriate for these applications but have a few limitations.…”

Effect of bidirectional loading on contact and force characteristics under a newly developed masticatory simulator with a dual-direction loading system

“…Laboratory simulation of human chewing is thus undoubtedly important in preclinical testing of a new dental material. Masticatory simulators have also been implicated in several preclinical tests including fracture resistance test, fatigue test and wear test [1][2][3][4][5] . In addition, the simulators are used to simulate aging before an ultimate load test 6) .…”