A Vickers hardness indenter was pressed into yttria-stabilized zirconia (Y-TZP) by the indentation fracture method (IF method).The effect on calculated hardness, toughness values, and load (9.8, 49, 98, 196, 294 N) examined to deduce optimum conditions of IF method. Calculated values were analyzed with one-way analysis variance then multiple comparisons (Scheffe). The appearance cracks also evaluated using a scanning electron microscopy (SEM).Indentation Y-TZP generated 9.8 49 N load,...

This study investigates the mechanical and surface properties of zirconia manufactured using additive manufacturing (AM) technology effect building direction on properties.Specimens were prepared ZrO2 paste (3DMix ZrO2; 3DCeram) a three-dimensional printing system (CeraMaker 900; based principles stereolithography (SLA). The (flexural strength, Vickers hardness, fracture toughness, elastic modulus, Poisson's ratio) (chemical composition observation) evaluated for three directions (parallel,...

This study evaluated the shear bond strengths and etching patterns of seven self-adhesive resin cements to human enamel specimens which were subjected one following surface treatments: (1) Polishing with #600 polishing paper; (2) Phosphoric acid; (3) G-Bond one-step adhesive; or (4) acid G-Bond. After treatment, incisor bonded a composite using cement [Maxcem (MA), RelyX Unicem (UN), Breeze (BR), BisCem (BI), seT (SE), Clearfil SA Luting (CL)] conventional [ResiCem (RE)]. Representative...

The accuracy of prostheses affects clinical success and is, in turn, affected by the scanner CAD programs. Thus, their is important. first aim this study was to evaluate an intraoral with active triangulation (Cerec Omnicam), a confocal laser (3Shape Trios), extraoral (D810). second compare digital crowns designed two different scanner/CAD combinations. scanners clinically acceptable. Marginal internal fit fabricated using programs were inferior those

Although additive manufacturing has been widely applied for occlusal splint (OS) fabrication, it is still unclear whether 3D printing system and post-curing atmosphere would play a role in the wear resistance of additive-manufactured OS. Therefore, aim this study was to evaluate effect (liquid crystal display (LCD) digital light processing (DLP)) (air nitrogen gas (N2)) on hard soft OS materials OSs (KeySplint® Hard Soft). The evaluated properties were microwear (by two-body test) nano-wear...

Objective. Water sorption, flexural properties, bonding and elemental composition of photopolymerizable resin-impregnated fiber-reinforced composite (FRC) materials (everStick C&B BR-100) (FPD) were evaluated in this study. Material methods. Bar-shaped specimens (2×2×25 mm) prepared for water sorption strength testing. The (n=6) polymerized either with a hand light-curing unit 40 s or, additionally, oven 20 min stored 30 days. was measured during time, followed by measurements modulus. A...

To evaluate the interactive influence of adhesive materials and surface treatments on bond strength zirconium oxide ceramics, six types resin cements (RelyX ARC (RA), Super-Bond C & B (SB), Linkmax (LM), Panavia Fluoro Cement (PF), Bistite II (BT), Imperva Dual (ID)), three resin-reinforced glass ionomer (Xeno Cem Plus (XC), Vitremer Luting (VR), Fuji (FL)), as well four (# 600 polishing, sandblasting, silane, Rocatec system) were used in this study. Results study indicated that all tested...

To evaluate the interactive effects of different self‐adhesive resin cements and tribochemical treatment on bond strength to zirconia. The following for bonding two zirconia blocks were evaluated: Maxcem (MA), Smartcem (SM), Rely X Unicem Aplicap (UN), Breeze (BR), Biscem (BI), Set (SE), Clearfil SA luting (CL). specimens grouped according conditioning as follows: Group 1, polishing with 600 grit paper; 2, silica coating 110 µm Al2O3 particles which modified silica; and, 3, ‐ + silanization....

The aim of this study was to evaluate the influence different framework materials on biomechanical behaviour anterior two-unit cantilever resin-bonded fixed dental prostheses (RBFDPs). A three-dimensional finite element model a RBFDP replacing maxillary lateral incisor created. Five were evaluated: direct fibre-reinforced composite (FRC-Z250), indirect (FRC-ES), gold alloy (M), glass ceramic (GC), and zirconia (ZI). Finite analysis performed stress distribution evaluated. similar pattern,...

Abstract Objective While mixed dentition space analysis is a common practice in pediatric dentistry, digital models created using an intraoral scanner are not as widely used clinical settings. This preliminary study very small sample size with one reference model and aimed to (1) compare the accuracy of obtained from optical impression that conventional plaster model-based (2) assess inter-examiner differences. Results The required for mandibular permanent canine premolars arch length...

Objective: This study investigates the reliability of different flexural tests such as three-point-bending, four-point bending, and biaxial tests, in strengthening dental pressed ceramics (DPCs) frequently used clinical applications. Methods: The correlations between three types bending for DPCs were investigated. Plate-shaped specimens three-point a disc-shaped specimen test prepared. Each was conducted using universal testing machine. Results: results six showed that strength descending...

Selective laser sintering (SLS) is being developed for dental applications. This study aimed to investigate the properties of Ti-6Al-4V and pure titanium specimens fabricated using SLS process compare them with casting specimens. Besides, effect building direction on was also investigated. Specimens were prepared by powder or powder. Casting alloys titanium. The mechanical (tensile strength elongation), physical (surface roughness, contact angle, Vickers hardness); corrosion resistors (color...

Rising prices are currently a problem in the world. In particular, abnormal increases price of metals, which often used dental prosthetics, have increased burden costs on public. There is therefore an urgent need to develop prosthetic devices made from materials that not affected by global situation and excellent biocompatibility mechanical properties comparable those metals. Polyether ether ketone (PEEK) promising alternative metal dentistry. This study compared effects different molding...

The chief aim of this study was to evaluate the influence three different types pretreatment solutions (phosphoric acid, self-etching primers, and polyacrylic acid) on enamel surfaced when used in association with one five orthodontic adhesive systems. In same vein, shear bond strength metal brackets also measured bonding procedure. After surfaces extracted human maxillary incisors were pretreated systems, scanning electron microscopy (SEM) observe effects enamel. Additionally, bonded...

The aim of this study was to evaluate and clarify the various mechanical properties behavior layering porcelains (Tokuyama Dental Ceramic, IPS Empress 2, Cerabien, Vitadurα, Creation) used for veneering high-strength ceramic core materials. studied exhibited following range properties: compressive strength at 586–1091 MPa, bending 30–97 diametral tensile 16–28 Vickers hardness 481–647 Hv, fracture toughness 1.36–2.05 MPa·m1/2. Results indicated that shortcomings conventional porcelain, such...

This study investigated the effects of low-temperature degradation (LTD) on L*, a*, and b* values highly translucent zirconia crowns. Four types disks with different yttria contents (IPS e.max ZirCAD LT, IPS MT, MT Multi, Prime, Ivoclar) two shades (A2 BL) were used. A crown was manufactured using four LTD treated. Color measurements performed, color difference (ΔE

The purpose of this study was to investigate the differences between Rocatec (as surface treatment) and #600 polishing control) on shear bond strength layering porcelain hybrid composite zirconium dioxide ceramics.Manufactured zirconia blocks used in were yttrium partially stabilized (YTZ(®)), veneering materials NobelRondo Zirconia Dentin A2 High Value (NZR) Estenia C&B (ES). Total 48 fabricated (10 mm × 10 20 mm). 24 each treated by paper, respectively. Surface divided into two groups,...

The purpose of this study was to investigate the effect repeated machining up 51 times using same diamond bur on accuracy inner and outer surfaces CAD/CAM (computer-aided designing computer-aided manufacturing) machined ceramic crowns. surface topography crowns examined photographs. It found that not affected by number times. In all measuring points, a dimension larger than die model (i. e., increased gap), whereas smaller crown crown). Photo observation showed cervical contour in clear,...

A three-dimensional finite element model of the lower first premolar, with three layers enamel, dentin, and pulp, mandible, two cortical cancellous bones, was directly constructed from noninvasively acquired CT images. This used to develop a system analyze stresses on teeth supporting bone structure during occlusion based method examine possibility mechanical simulation.