Publications by authors named "Pascal Behin"
Article Synopsis
- A study was conducted to see how different concentrations of sodium carbonate (Na₂CO₃) affect the adhesion between two layers of irreversible hydrocolloid impression material.
- The researchers tested three different concentrations of Na₂CO₃ (0.1, 0.7, or 7.0 wt.%), plus a control group without Na₂CO₃, and analyzed the adhesion strength and failure modes using traction tests.
- Results showed that the 0.7% Na₂CO₃ concentration significantly enhanced bond strength and adhesion energy compared to the other groups, and only cohesive failures occurred at this concentration, indicating better quality in dental impressions.
Article Synopsis
- The study investigates the ideal polymerization pressure for Polymer Infiltrated Ceramic Network (PICN) blocks by analyzing how different pressures impact their conversion degree and viscoelastic properties.
- High pressure polymerization was tested at 50-350 MPa, revealing that pressures between 100-150 MPa (without post-cure treatment) yield the best results in terms of conversion degree and mechanical properties.
- While post-curing increases the conversion degree, it has mixed effects on the thermomechanical properties of the PICN blocks, suggesting careful optimization is needed for ideal performance.
Article Synopsis
- SLA ceramic crown frameworks are clinically viable, but the effects of build orientation on their properties have not been fully explored.
- This study aimed to assess how three different build orientations (ZX, ZY, XY) affect the physical and mechanical properties of SLA alumina ceramics through various testing methods.
- Results indicated that specimens printed in the ZY orientation exhibited superior mechanical properties compared to ZX and XY orientations, along with a unique microstructure influenced by layer orientation.
Objectives: Gingival recessions are frequently associated with noncarious cervical lesions. Combined restorative surgical approaches have been suggested for the management of these combined defects. The aim of this review was to analyze the current evidence on the effectiveness of these combined restorative surgical approaches.
View Article and Find Full Text PDFObjectives: The aim of this study was to compare the physical and mechanical properties of stereolithography (SLA)- manufactured alumina ceramics of different composition to those of subtractive- manufactured ceramics and to produce suitable dental crown frameworks.
Methods: The physical and mechanical properties of a control and six experimental SLA ceramics prepared from slurries with small (S) and large (L) particles (0.46±0.
Objectives: The aim of this study, part of our research to improve properties of resin composite blocks suitable for CAD/CAM and to better understand underlying mechanisms associated with high-temperature/high-pressure (HT/HP) polymerization, was to determine an optimum polymerization pressure of urethane dimethacrylate (UDMA) in the presence of an initiator (0.5% benzoyl peroxide) by determining the degree of conversion (DC) and viscoelastic properties of polymers obtained at 90°C under varying HP.
Methods: DC and viscoelastic properties of 16 UDMA polymers, two controls (thermo-cured and thermo-cured followed by post-cure relaxation) and 14 experimental groups (HP polymers, in the range of 50-350 MPa, in 50 MPa increments, without and with post-cure relaxation) were determined via near infrared spectroscopic analysis and dynamic mechanical analysis, respectively.
Statement Of Problem: Direct optical impression systems requiring powder opacification are widely used in prosthodontics, but little information is available about the influence of the dentist on the quality of scan sprays used for computer-aided design and computer-aided manufacturing (CAD/CAM) impressions.
Purpose: The purpose of this study was to evaluate the influence of operator experience on scan spray homogeneity and thickness on tooth surfaces before direct optical impressions are made.
Material And Methods: A total of 36 crown-prepared acrylic resin teeth were coated (Optispray) for direct optical impressions by 3 experienced dentists and 3 inexperienced dentists (n=18 teeth per group).
Objectives: The aim of this study was to compare the viscoelastic properties of high pressure (HP) polymerized urethane dimethacrylate (UDMA) with those of control, ambient pressure thermo-polymerized and photo-polymerized, UDMA and to assess the effect of varying polymerization parameters (protocol, temperature, and initiator) on the viscoelastic properties of HP polymerized UDMA.
Methods: The viscoelastic properties of the two control polymers, polymerized under atmospheric pressure, and four experimental polymers, polymerized under HP, were determined via dynamic mechanical analysis (DMA), in three point bending configuration. Atomic force microscopy (AFM) was used to characterize fractured polymer surface morphologies.