This study investigated the effect of amount thickness reduction on color and translucency dental monolithic zirconia ceramics. One-hundred sixty-five specimens (16.3 mm × 16.3 2.0 mm) were divided into 5 groups (Group I to V) according number A2-coloring liquid applications. Each group was then 11 subgroups by reducing up 1.0 in 0.1-mm increments (Subgroup 0 10, n=3). Colors spectral distributions measured CIELAB a reflection spectrophotometer. All measurements performed five different...

Recently Yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) has been introduced due to superior flexural strength and fracture toughness compared other dental ceramic systems. Although outstanding mechanical properties, the phenomenon of decrease in life-time resulted from degradation after low temperature aging reported.The objective this study was investigate Y-TZP ceramics various treatments evaluate phase stability micro-structural change by using X-ray diffraction analysis a...

Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead an inadequate which exposes more luting material oral environment causes secondary caries. The purpose of this study was compare marginal 2 different all-ceramic crown systems before after veneering. This also intended verify crowns originated from green machining partially sintered blocks zirconia (Lava CAD/CAM system) that obtained...

The aim of this study was to evaluate the effect polishing and glazing on color spectral distribution monolithic zirconia.Forty-five zirconia specimens (16.3 mm × 16.4 2.0 mm) were fabricated divided into 5 groups according number A2-coloring liquid applications (Group I V). Each group 3 subgroups method surface treatments (n=3): N: no treatment; P: polishing; G: glazing. Color five different areas each specimen measured CIELAB space in reflectance mode relative standard illuminant D65 a...

This study evaluated the effect of several airborne-particle abrasion protocols on surface characteristics monolithic zirconia and protocol choice shear bond strength resin cement. 375 bar-shaped (45×4×3 mm3) 500 disk-shaped (Ø9×1 mm2) specimens were divided into 25 groups. All abraded with one three different sizes alumina particles (25, 50 or 125 μm), two pressures (2 4 bar), distinct application times (10 20 s) incidence angles (45° 90°). The used for 3-point bending test; Weibull...

Aim: Settling (embedment relaxation), which is the main cause for screw loosening, developed by microroughness between implant and abutment metal surface. The objective of this study was to evaluate compare relationship level applied torque settling abutments into implants in external internal implant–abutment connection. Material methods: Five different connections were used (Ext, External butt joint+two-piece abutment; Int-H2, Internal hexagon+two-piece Int-H1, hexagon+one-piece Int-O2,...

Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system.The purpose this study was to compare fit FPDs made using two CAD/CAM systems with that metalceramic FPDs.MATERIALS AND METHODS.Artificial resin maxillary central and lateral incisors were prepared for in yellow stone.This model duplicated epoxy die.On die, 15 three-unit per group (45 total): Group A, Everest...

Fracture of the veneering material zirconia restorations frequently occurs in clinical situations.The purpose this vitro study was to compare fracture strengths crowns veneered with various ceramic materials by techniques.MATERIALS AND METHODS.A 1.2 mm, 360�chamfer preparation and occlusal reduction 2 mm were performed on a first mandibular molar, 45 model dies fabricated titanium alloy CAD/CAM system.Forty-five copings divided into three groups.In group (LT) feldspathic porcelain layering...

Macroscopic and especially microscopic properties of implant surfaces play a major role in the osseous healing dental implants. Dental implants with modified have shown stronger osseointegration than which are only turned (machined). Advanced surface modification techniques such as anodic oxidation Ca-P application been developed to achieve faster bonding between host bone implant.The purpose this study was investigate effect treatment titanium on stability after insertion using rabbit tibia...

Limited information is available on the optimal cement thickness of monolithic zirconia crowns. This study was designed to evaluate stress distribution in posterior crowns with different thicknesses under masticatory force and maximum bite using three-dimensional finite element analysis. The prepared unprepared mandibular right first molar models were scanned exported computer-aided design system. Solid crowns, which cemented teeth generated. Four fabricated applying (100 µm, 200 400 600...

Purpose: This case report discusses the effect of a root submergence technique on preserving periodontal tissue at pontic site fixed dental prostheses in maxillary anterior aesthetic zone.Methods: Teeth with less than ideal structural support for retainer abutments were decoronated crestal bone level.After soft closure, final placed pontics over submerged area.Radiographic and clinical observations sites documented. Results:The roots preserved surrounding periodontium without any periapical...

The purpose of this study was to evaluate the effects coping designs on stress distributions in posterior zirconia crowns by non-linear three-dimensional finite element analysis. Three-dimensional models a mandibular right first molar with layers veneering porcelain, coping, cement, and abutment tooth were designed computer software (HyperWorks 10.0). Ten different produced according various shoulder positions heights. shoulders (1-mm width) exhibited incremental height increases 1 mm, 2 3...

This study evaluated the effect of surface treatments on bond strength repaired temporary resins. One-hundred flat-surfaced cylindrical specimens (Ø 7 mm × 12 mm) each resin (2 bis-acryl resins and 2 polymethyl-methacrylates) were prepared. The randomly divided into 10 groups (n = 10), according to types treatments: untreated, adhesive treated, silanated, silane + hydrofluoric acid etched, laser sandblasted, sandblasting tribochemical silica coating silanated. Each material same brand with...

Objectives The purpose of this study was to evaluate initial bacterial adhesion on several restorative materials with similar roughness. Materials and Methods Sixty cylindrical slabs were prepared from four materials: zirconia (Zr), alumina-toughened (Al-Zr), type III gold alloy (Au), cp-titanium (Ti). All the polished until a mirror-like shine achieved. average surface roughness topography determined by atomic force microscopy. Contact angles measured calculate free energy sessile drop...

The purposes of this study were to evaluate the effects intermediate ceramics on adhesion between zirconia core and veneer ceramics.The polished surfaces fully sintered Y-TZP blocks received three different treatments: (1) connector (C), (2) liner (L) or (3) wash layer (W). All treated veneered with either (a) fluorapatite glass-ceramic (E) (b) feldspathic porcelain (V) divided into four groups (CE, CV, LE WV). For control group, testing metal (VM). A half samples in each group (n = 21)...

This article describes esthetic improvement in a patient with missing maxillary left central incisor. Space analysis of the anterior dentition showed that minor tooth rearrangement was needed. Optimal space distribution for restorations attained by orthodontic treatment. Through transforming shape porcelain laminate veneers, lateral incisor transformed into and canine The right also restored improvement. In case changing pre-treatment evaluation, diagnostic wax-up are important factors.

All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of study was compare strengths two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident.Twenty CAD/CAM twenty Digident were fabricated. A metal die also duplicated from original prepared tooth testing. universal testing machine determine strength crowns.THE...

This study was designed to evaluate the effects of different coping designs on fracture modes posterior zirconia crowns. One hundred mandibular molar copings ten were fabricated from 3Y-TZP. All groups (n=10) had 1 mm wide shoulder, but they varying heights mm, 2 or 3 buccal, lingual and proximal sides. After being sintered veneered, crowns titanium abutments stored in distilled water at 37 °C for 24 h. Then loaded into a universal testing machine. The veneer load bulk values measured....

The objective of this study was to evaluate fracture strength collarless metal-ceramic FPDs according their metal coping designs.Four different facial margin design groups were investigated. Group A a with thin collar, group B its the shoulder, C 1 mm short and D 2 shoulder. Fifteen 3-unit fabricated in each group. Finished cemented PBT (Polybutylene terephthalate) dies resin cement. test carried out using universal testing machine (Instron 4465, Instron Co., Norwood MA, USA) at cross head...

If orthodontists and restorative dentists establish the interdisciplinary approach to esthetic dentistry, functional outcome of their combined efforts will be greatly enhanced.This article describes satisfying results obtained by distribution space for restoration orthodontic treatment porcelain laminate veneers in uneven between maxillary anterior teeth.It is proposed that use re-distribution alter crown anatomy provide maximum correction patients with irregular interdental spacing.

Titanium, zirconia and HAp were known as good biocompatible materials for tissue engineering. Osteblastic cell response is influence by the surface topography of material its chemical composition well. To evaluate different compositions on osteoblast-like cells specimens polished until they have almost identical roughness. The commercially pure titanium, zirconia/alumina composite nano-sized hydroxyapatite (HAp) synthesized hydrothermal method used to attachment, proliferation...

Monolithic zirconia restorations increasingly have been used in dental practice recent years and demonstrate superior mechanical performance compared with porcelain-veneered restorations. Recent advances manufacturing technology made possible the fabrication of translucent monolithic ceramics. This case report describes three clinical examples fixed prostheses being anterior posterior regions exhibiting acceptable esthetic results.