Reverse torque evaluation in indexed and nonindexed abutments of Morse Taper implants in a mechanical fatigue test.

Background: This experimental study assessed reverse torque of indexed and nonindexed (NI) abutments in Morse Taper (MT) implants in a mechanical fatigue test.

Materials And Methods: In this experimental study It was used 37 implants MT and over them installed Pilar Flex abutments (4.8 mm × 6 mm × 1.

Biomechanical Behavior of an Implant System Using Polyether Ether Ketone Bar: Finite Element Analysis.

Aim And Objectives: This study assessed, through finite element analysis, the biomechanical behavior of an implant system using the All-on-Four technique with nickel-chromium (M1) and polyether ether ketone (PEEK) bars (M2).

Materials And Methods: Implants and components were represented in three-dimensional (3D) geometric models and submitted to three types of load: axial, oblique, and load on all teeth. The 3D models were exported to a computer-aided design-like software such as Solidworks 2016 (Dassault Systemes, Solidworks Corps, USA) for editing and Nonuniform Rational Basis Splines parametrization.

Analysis of the Mechanical Behavior and Surface Rugosity of Different Dental Die Materials.

Aim: This work evaluated the mechanical and surface behavior of different die materials. The studied materials are polyurethane resin Exakto-Form (Bredent), Gypsum type IV, Fuji Rock EP (Gc), and Durone (Dentsply).

Materials And Methods: Two metallic matrices molded in polyvinyl siloxane provided 30 cylindrical test specimens for the diametral compression test and 30 hemispherical test specimens for the surface rugosity test.

Fatigue limits for composite restorations with and without glass ionomer cement liners.

This laboratory study compared the flexural endurance limits of clinical combinations of dental composite with and without glass ionomer cement (GIC) liners. Using only composite (Filtek Z350), specimens (10 mm long x 2 mm wide x 2 mm thick) in the control group were produced. Two GICs (Vitremer and Vitrebond) were used with the composite to prepare the test groups.

Effect of artificial accelerated aging on Vickers microhardness of composite resins.

Successful restoration depends on the mechanical resistance of dental restorative materials. The occlusal forces from masticatory contacts can affect the durability of restorations and cause fractures. Over time, monomers convert to polymers, leading to degradation of the organic matrix, which can interfere with mechanical resistance.

Inferior alveolar nerve transposition with involvement of the mental foramen for implant placement.

Inferior Alveolar Nerve (IAN) transposition is an option for prosthetic rehabilitation in cases of moderate or even severe bone reabsorption for patients that do not tolerate removable dentures. The aim of the present report is to describe an inferior alveolar nerve transposition with involvement of the mental foramen for implant placement. The surgical procedure was performed under local anesthesia, by the inferior alveolar, lingual and buccal nerve blocking technique.

Shear strength evaluation of composite-composite resin associations.

Objective: The aim of this study was to investigate the shear strength between distinct associations of different commercial composite resins and their fracture modes.

Methods: Nine composite-composite associations (n=90) were prepared for shear strength evaluation and separated into the following groups: Z/Z (Filtek Z250 UD+Filtek Z250 A2); Z/D (Filtek Z250 UD+Durafill VS A2); Z/S (Filtek Z250 UD+Filtek Supreme YT); C/C (Charisma OA2+Charisma A2); C/D (Charisma OA2+Durafill VS A2); C/S (Charisma OA2+Filtek Supreme YT); H/H (Herculite XRV B2D+Herculite XRV B2E); H/D (Herculite XRV B2D+Durafill VS A2); H/S (Herculite XRV B2D+Filtek Supreme YT). Shear tests were carried out using universal mechanical test equipment with a load of 200kgf and speed of 0.