Introduction: Post debonding is one of the most important causes restoration failure in endodontically treated teeth restored with fiber-post. The weakest connection post-cement-dentin complex cement-dentin bonding surface. In this study we evaluated effect etching phosphoric-acid and its duration on push-out strength self-adhesive resin cement to dentin. Materials Method: Root canal therapy wa...

The new stand called DURAMETR with a computer program based on LabVIEW software to investigate textile creep is described. An analysis of filament creep under constant load is presented. A comparative analysis of changes of filament strain under constant load obtained from DURAMETR, and the INSTRON tester which uses the XII cyclic program is presented.

Objective: To evaluate the influence of type cement on fracture resistance full-contour resin nanoceramic crowns cemented over preparations with knife-edge margins. Methods: A right lower premolar typodont model was prepared a 1.5-mm axial reduction, 2.0-mm occlusal and vertical margin. An anatomical crown designed from digital scanning preparation using CAD/CAM software. Then, 20 were milled b...

Background: Long-term use of denture causes significant changes in its supporting structures and can lead to constant pain discomfort. Soft lining material extensively used field prosthodontics improve fit conventional acrylic resin for restoring optimal health abused oral tissue showing degenerative change. Method: Specially designed metal mould fabrication 80 blocks. Applying soft liner betwe...

Objective: The aim of this study was to assess the micro-push-out bond strength a mineral-based root canal sealer, BioRoot RCS in canals prepared by K3XF rotary systems two different tapers. Material and Methods: Eighty caries free maxillary central incisors were used study. samples allocated into 4 groups (n=20) according sealer taper instruments. obturated using single cone obturation techniq...

objective: comparing the effect of repeated opening of the container lid of two dentin adhesive systems, prime&bond; nt (p&b; nt) and ibond (ib), on shear bond strength. materials and methods: intact bovine lower incisors (n=60), fixed in acrylic were ran-domly divided into six groups (n=10). groups i and ii were set as control groups. p&b; nt and ib were applied on the samples after five days ...

objective: repair of an indirect restoration is usually preferred over its replacement. this study aimed to evaluate the effect of silane in different surface preparation techniques on the bond strength of direct to indirect composite resin.   methods: for this in vitro experimental study, 48 indirect composite cubes were fabricated, divided into 4 groups of 12 and subjected to the following pr...

objective: the diagnosis of vertical root fracture (vrf) in endodontically treated teeth is a clinical challenge due to lack of specific clinical and radiographic signs. although radiographic evaluation such as cbct is helpful, intracanal posts can produce artifacts and may impair the quality of cbct scans. this study aimed to compare the diagnostic accuracy of different resolutions of cbct in ...

introduction: this study sought to assess the effects of amperage (ma) and field of view (fov) on intracanal metal post artifacts and the diagnostic parameters for detection of vertical root fracture (vrf) in teeth with intracanal posts. methods and materials: in this diagnostic study, 80 human single-canal teeth were evaluated by cone-beam computed tomography (cbct). nickel chrome cast posts w...