The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of 45° to the long...

PURPOSE To evaluate in vitro the fracture resistance of quartz fiber posts for three different dowel lengths. METHODS 30 single-rooted human premolars with similar root length and diameter were endodontically treated and randomly divided into three experimental groups (n = 10) according to the post space depth created: (1) 5 mm; (2) 7 mm; (3) 9 mm. Quartz fiber posts (Endo Light post) were ce...

Concrete pavement recycling is a relatively simple process that involves breaking, removing and crushing hardened concrete from an acceptable source to produce recycled concrete aggregate (RCA). The formal process of RCA production typically involves an initial evaluation of the existing source concrete; pavement preparation, which may include removal of an asphalt overlay; pavement breaking, r...

Tooth trauma has been and continues to be a common occurrence that every dental professional must be prepared to assess and treat when necessary. Tooth trauma and its management loom as a major challenge to the dental practitioner. Transverse root fractures occur most commonly in the maxillary teeth. This case report describes a new technique for the management of transverse root fractures in z...

We present a design methodology and manufacturing process for the construction of articulated three-dimensional microstructures with features on the micron to centimeter scale. Flexure mechanisms and assembly folds result from the bulk machining and lamination of alternating rigid and compliant layers, similar to rigid-flex printed circuit board construction. Pop-up books and other forms of pap...

Experimental trials on the performance of end-effectors for automated harvest soft fruit are constrained by seasonal limitations availability and perishability, necessitating use different sets across time. Consequently, stalk phantoms, rather than real fruit, is an attractive proposition. In this paper, a process cost-effective production stable phantoms using silicone (polydimethylsiloxane, P...

Fatigue design of composite girders and in particular shear connectors according to Eurocode 4 is based on fatigue strength curves. Therefore, the lifetime a girder can be limited by failure critical connector. The probability component thus determined one stud or dowel, although an internally highly statically indeterminate system with possibility redistributing forces connection. This paper o...

Herein, a beech wood dowel reinforced with self-tapping screw (composite in brief) is proposed. Composite dowels were welded into the predrilled holes by high speed rotation. Force-displacement curves obtained using single-shear and dual connection. A double-peaked pattern was found bearing process, indicating that wooden had synergistic effect process. Regarding failure mode, bent, whilst defa...