Flexural properties and finite element analysis of novel 3D-printed ceramic materials via 3D-LCM technology.

Background: This study evaluates the mechanical properties of dental crown prosthodontic materials by investigating the flexural strength and stress distribution of various ceramic materials, including milled zirconia and two ceramics fabricated using LCM technology, employing Finite Element Analysis (FEA).

Methods: Seventy-five samples were divided into five groups: milled zirconia, Zirconia-210, Zirconia-230, Alumina-350 and Alumina-500. Flexural strength tests, including three-point bending, Weibull analysis and FEA, were conducted to analyse stress distribution.

THE MARGINAL ACCURACY OF LITHIUM DISILICATE SINGLE CROWNS IS COMPAREABLE WHEN MADE FROM CONVENTIONAL OR DIGITAL (DIRECT OR INDIRECT) WORKFLOWS.

Article Title And Bibliographic Information: Tabesh M, Nejatidanesh F, Savabi G, Davoudi A, Savabi O. Marginal accuracy of lithium disilicate full coverage crowns made by direct and indirect digital or conventional workflows: a systematic review and meta-analysis. J Prosthodont.

Mechanical properties of a resin-modified glass-ionomer cement reinforced with short-glass fiber flowable resin composites.

Purpose: To evaluate the improvement of selected mechanical properties of a resin-modified glass-ionomer cement (RMGIC) with a discontinuous short E glass fiber flowable resin composites (GFRRC) to be used in load-bearing areas of permanent teeth.

Methods: Experimental materials were prepared using two different weight proportions, 7 wt% (1.75% E glass fibers) and 25 wt% (6.

Mechanical and Biocompatibility Properties of 3D-Printed Dental Resin Reinforced with Glass Silica and Zirconia Nanoparticles: In Vitro Study.

This study aimed to assess the mechanical and biocompatibility properties of dental resin reinforced with different nanoparticle additives. Temporary crown specimens were 3D-printed and grouped based on nanoparticle type and amount, including zirconia and glass silica. Flexural strength testing evaluated the material's ability to withstand mechanical stress using a three-point bending test.

The Clinical Potential of 3D-Printed Crowns Reinforced with Zirconia and Glass Silica Microfillers.

The development of 3D-printed crown resin materials with improved mechanical and physical properties is an area of growing interest in dentistry. This study aimed to develop a 3D-printed crown resin material modified with zirconia glass (ZG) and glass silica (GS) microfillers to enhance overall mechanical and physical properties. A total of 125 specimens were created and divided into five groups: control unmodified resin, 5% either ZG or GS reinforced 3D-printed resin, and 10% either ZG or GS reinforced 3D-printed resin.

Effect of Printing Layer Thickness and Postprinting Conditions on the Flexural Strength and Hardness of a 3D-Printed Resin.

Background: Recently, dentists can utilize three-dimensional printing technology in fabricating dental restoration. However, to date, there is a lack of evidence regarding the effect of printing layer thicknesses and postprinting on the mechanical properties of the 3D-printed temporary restorations with the additive manufacturing technique. So, this study evaluated the mechanical properties of a 3D-printed dental resin material with different printing layer thicknesses and postprinting methods.

Influence of Platform Switching, Abutment Design and Connection Protocols on the Stability of Peri-Implant Tissues. A Systematic Review.

Purpose: To appraise the effect of abutment factors namely platform switching, design and connection protocols on the stability of peri-implant tissues.

Materials And Methods: An electronic and hand search were conducted. Randomized control trials and controlled prospective studies of at least one-year follow-up, published in the last 12 years, were included.

Biomechanical Properties in Different Types of Thin Corneas in Menoufia Population.

Background: To evaluate and compare corneal hysteresis (CH) and corneal resistance factor (CRF) in normal thin (NT) healthy corneas with central corneal thickness (CCT) of 470-500 m with matched thickness in keratoconus suspect (KCS) and keratoconus (KC) eyes.

Methods: A total of 103 eyes in three groups were included prospectively: NT, KCS, and KC groups based on clinical examination and Pentacam findings. Corneal hysteresis (CH) and corneal resistance factor (CRF) were measured using the ocular response analyzer (ORA).

Evaluation of Conjunctival Autografting Augmented with Mitomycin C Application Ologen Implantation in the Surgical Treatment of Recurrent Pterygium.

Objectives: To evaluate the safety and efficacy of augmenting conjunctival autografting with intraoperative mitomycin C (MMC) application Ologen implantation in the management of recurrent pterygium.

Materials And Methods: This prospective randomised study included 63 eyes of 63 patients, with recurrent nasal pterygium, who presented to the outpatient clinic of Menoufia University Hospital in Shebin El Kom and Manshiet Soltan from January 2016 to December 2019. Patients were randomly enrolled into two groups.

Evaluation of rheological behaviour of flowable dental composites reinforced with low aspect ratio micro-sized glass fibres.

Objective: Experimental investigation is carried out to determine the flowability and stickiness of the developed composite material for dental restoration containing low aspect ratio (AR ≤ 100) surface treated micro-sized glass fibres.

Methods: Specimens are manufactured by mixing low AR (50/70/100) micro-sized glass fibres with two different weight fractions (5%/10%) into UDMA/TEGDMA based resin. Particulate filler composite (PFC) containing 55% glass fillers is used as the control group.

Fiber reinforcement of a resin modified glass ionomer cement.

Objectives: Understand how discontinuous short glass fibers and braided long fibers can be effectively used to reinforce a resin modified glass ionomer cement (RMGIC) for carious lesion restorations.

Methods: Two control groups (powder/liquid kit and capsule) were prepared from a light cured RMGIC. Either discontinuous short glass fibers or braided polyethylene fiber ribbons were used as a reinforcement both with and without pre-impregnation with resin.

Acoustic emission and finite element study on the influence of cusp angles on zirconia dental crowns.

Objective: The effect of cusp angle on the load-carrying capacity and failure behaviour of BionZ Diamond zirconia crowns is carried out using experimental and numerical investigations.

Methods: The experimental program using monolithic crowns were divided into three groups (n = 14) for three cusp angles, 60, 80 and 120 degrees and were tested to failure under the static load. A 2-channel acoustic emission (AE) system was used to monitor the failure process while the piezo sensors were attached to the rigid stainless-steel jig for recoding the AE events.

Effect of cooling protocol on mechanical properties and microstructure of dental veneering ceramics.

Objectives: Understand how cooling protocols control the microstructure and mechanical properties of veneering porcelains.

Methods: Two porcelain powders were selected, one used to veneer metallic frameworks (VM13) and one for zirconia frameworks (VM9). After the last firing cycle, the monolithic specimens were subjected to two cooling protocols: slow and fast.

Nd:YAG laser therapy for non-resolving premacular subhyaloid hemorrhage in Saudi patients.

Purpose: To report anatomical and visual outcomes of Nd:YAG laser posterior hyaloidotomy (NYPH) in Saudi patients affected by Premacular subhyaloid haemorrhage (PMSHH).

Methods: 8 eyes from 8 patients (7 males and one female) were treated with NYPH when no spontaneous resolution of PMSHH was noticed. The cause of PMSHH was proliferative diabetic retinopathy (PDR) in 3 cases, Central retinal vein occlusion (CRVO) in 2 cases, Valsalva retinopathy in 2 cases, and laser pointer injury in one case.

Microstructural and Mechanical Characterization of CAD/CAM Materials for Monolithic Dental Restorations.

Purpose: To determine and compare the microstructure, flexural strength, flexural modulus, fracture strength, and microhardness of four types of computer-aided design/computer-aided manufacturing (CAD/CAM) materials for monolithic dental restorations.

Materials And Methods: A lithium disilicate (LD; IPS e.max CAD), a zirconia-reinforced lithium silicate (ZLS; VITA Suprinity), a hybrid high-performance polymer (HPP) composite resin (GC Cerasmart), and a hybrid polymer-infiltrated ceramic network (PICN) material (VITA Enamic) were used to manufacture monolithic ceramic posterior crowns (n = 10) that were adhesively cemented on resin-based composite dies and loaded until fracture.

A Novel Methodology to Validate the Accuracy of Extraoral Dental Scanners and Digital Articulation Systems.

Purpose: The aim of the current study is to develop a novel method to investigate the accuracy of 3D scanners and digital articulation systems.

Materials And Methods: An upper and a lower poured stone model were created by taking impression of fully dentate male (fifty years old) participant. Titanium spheres were added to the models to allow for an easily recognisable geometric shape for measurement after scanning and digital articulation.

Evaluation of the physical properties of dental resin composites using optical fiber sensing technology.

Objectives: The characterization of the physical properties of dental resin composites is fraught with difficulties relating to significant intra and inter test parameter variabilities and is relatively time consuming and expensive. The main aim of this study was to evaluate whether optical fiber Bragg grating (FBG) sensing system may become a viable tool to study dental material characteristics. Of particular focus was the potential for the system to demonstrate a multi parameter all-in-one feature.

Long-term follow-up of vitrectomy, with or without 360° encircling buckle, for rhegmatogenous retinal detachment due to inferior retinal breaks.

Objective: The aim of this study was to report and compare the anatomic and functional results of primary vitrectomy with and without 360° encircling scleral buckle (SB) for the treatment of rhegmatogenous retinal detachment (RRD) due to inferior retinal break(s).

Background: A variety of options, including SB, pars plana vitrectomy (PPV) with or without SB, and pneumatic retinopexy have been described as methods to repair RRDs. The use of additional SB with vitrectomy for RRD associated with inferior breaks has been a recent controversy after the introduction of transconjunctival cannula systems.

RESULTS OF PARS PLANA VITRECTOMY FOR THE MANAGEMENT OF ENDOGENOUS FUNGAL ENDOPHTHALMITIS AFTER URINARY TRACT PROCEDURES.

Purpose: To report the results of pars plana vitrectomy with adjuvant intravitreal amphotericin B and systemic fluconazole in the management of endogenous endophthalmitis after the urinary tract procedures.

Methods: Retrospective study of 10 eyes of 7 patients diagnosed as endogenous fungal endophthalmitis. Pars planavitrectomy with adjuvant intravitreal amphotericin B and oral fluconazole was conducted once the general condition is suitable.

Effect of short glass fibers on the polymerization shrinkage stress of dental composite.

This study examines contraction stresses of seven short fiber reinforced composites (sFRC) exhibiting different volume loads and aspect ratios (AR)* of fibres. The shift towards a greater utilization of posterior resin composites in dentistry has seen increased interest in the use of randomly oriented short glass fibers in these restorative materials. While the effect of these fibers on modulus, strength, and toughness has been studied, very little information exists on their effect on polymerization shrinkage and even less on shrinkage stress.

Enhancing Fluoride Mediated Dentine Sensitivity Relief through Functionalised Tricalcium Phosphate Activity.

Background. To assess the clinical efficacy of a dentifrice containing fluoride and functionalised tricalcium phosphate (fTCP) in reducing dentine sensitivity. Methods.

Reducing composite restoration polymerization shrinkage stress through resin modified glass-ionomer based adhesives.

Background: The aim of this study was to determine whether employing resin modified glass-ionomer based adhesives can reduce polymerization contraction stress generated at the interface of restorative composite adhesive systems.

Methods: Five resin based adhesives (G Bond, Optibond-All-in-One, Optibond-Solo, Optibond-XTR and Scotchbond-Universal) and two resin modified glass-ionomer based adhesives (Riva Bond-LC, Fuji Bond-LC) were analysed. Each adhesive was applied to bond restorative composite Filtek-Z250 to opposing acrylic rods secured within a universal testing machine.

The effect of fiber aspect ratio and volume loading on the flexural properties of flowable dental composite.

Objective: To evaluate the efficacy on flexural properties of flowable dental resin composite reinforced with short glass fiber of different aspect ratios (ARs) and volume percent loadings. It is hypothesized that with the addition of randomly oriented fibers it is possible to significantly improve flexural strength and modulus while maintaining flowability.

Methods: Ten groups of samples with varying glass fiber volume loads (0, 5%, 10%, 20%, 40% and 60%) and three different ARs (5.