Extruded upper first molar intrusion: Comparison between unilateral and bilateral miniscrew anchorage.

Objective: The aim of his study was to evaluate the stress on tooth and alveolar bone caused by orthodontic intrusion forces in a supraerupted upper molar, by using a three-dimensional Finite Element Method (FEM).

Methods: A superior maxillary segment was modeled in the software SolidWorks 2010 (SolidWorks Corporation, Waltham, MA, USA) containing: cortical and cancellous bone, supraerupted first molar, periodontal tissue and orthodontic components. A finite element model has simulated intrusion forces of 4N onto a tooth, directed to different mini-screw locations.

Biomechanical Behavior of Extensively Restored Premolars: Cusp Deformation, Marginal Integrity, and Fracture Resistance.

Purpose: To study the biomechanical behavior of extensively restored premolars by determining the effect of the composite type, presence of cusp weakening, and compressive loading on the cusp deformation (CD), marginal integrity (MI), and fracture resistance (FR) of directly restored premolars.

Materials And Methods: Forty premolars received Class II mesio-occlusal-distal (MOD) cavities and were divided into 4 groups (n = 10) in accordance with the two study variables: composite type (conventional: Filtek Z250 XT [Z250], 3M ESPE; low shrinkage: Venus Diamond [VD], Heraeus-Kulzer) and the presence of cusp weakening (with/without). Cusp deformation upon restoration was assessed using strain gauges during the restorative procedure and thereafter when the restorations were subjected to an occlusal load of 100 N.

Effect of punch and orifice base sizes in different push-out test setups: stress distribution analysis.

Purpose: This study evaluated the influence of punch and base orifice diameters on push-out test results by means of finite element analysis (FEA).

Materials And Methods: FEA was performed using 3D models of the push-out test with 3 base orifice diameters (2.5, 3.

Microtensile bond strength of methacrylate and silorane resins to enamel and dentin.

The aim of this study was to evaluate the microtensile bond strength (µTBS) of two substrates (enamel and dentin) considering two study factors: type of composite resin [methacrylate-based (Filtek Supreme) or silorane-based (Filtek LS)] and aging time (24 h or 3 months). Twenty human molars were selected and divided into 2 groups (n=10) considering two dental substrates, enamel or dentin. The enamel and dentin of each tooth was divided into two halves separated by a glass plate.

Influence of chlorhexidine on dentin adhesive interface micromorphology and nanoleakage expression of resin cements.

This study focused on adhesive interface morphologic characterization and nanoleakage expression of resin cements bonded to human dentin pretreated with 1% chlorhexidine (CHX). Thirty-two non-carious human third molars were ground flat to expose superficial dentin. Resin composite blocks were luted to the exposed dentin using one conventional (RelyX ARC) and one self-adhesive resin cement (RelyX U100), with/without CHX pretreatment.

A complete esthetic approach with multiple diastemata in anterior teeth: 1-year follow-up.

Anterior diastemata and discolored teeth may interfere with the harmony of a person's smile. This article presents a case involving multidisciplinary intervention for esthetic treatment utilizing integrated microabrasion, dental bleaching, and restorative solutions. The relevant aspects of etiology and treatment planning are discussed.