Application of Monolithic Zirconia Ceramics in Dental Practice: A Case History Report.

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

Effect of the amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics.

Purpose: This study investigated the effect of amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics.

Materials And Methods: One-hundred sixty-five monolithic zirconia specimens (16.3 mm × 16.

Effects of surface treatments on the translucency, opalescence, and surface texture of dental monolithic zirconia ceramics.

Statement Of Problem: Surface polishing or glazing may increase the appearance of depth of monolithic zirconia restorations.

Purpose: The purpose of this in vitro study was to investigate the effects of surface treatments on the translucency, opalescence, and surface texture of dental monolithic zirconia ceramics.

Material And Methods: Forty-five monolithic zirconia specimens (16.

A root submergence technique for pontic site development in fixed dental prostheses in the maxillary anterior esthetic zone.

Purpose: This case report discusses the effect of a root submergence technique on preserving the periodontal tissue at the pontic site of fixed dental prostheses in the maxillary anterior aesthetic zone.

Methods: Teeth with less than ideal structural support for fixed retainer abutments were decoronated at the crestal bone level. After soft tissue closure, the final fixed dental prostheses were placed with the pontics over the submerged root area.

Effect of various intermediate ceramic layers on the interfacial stability of zirconia core and veneering ceramics.

Objectives: The purposes of this study were to evaluate the effects of intermediate ceramics on the adhesion between the zirconia core and veneer ceramics.

Materials And Methods: The polished surfaces of fully sintered Y-TZP blocks received three different treatments: (1) connector (C), (2) liner (L) or (3) wash layer (W). All the treated zirconia blocks were veneered with either (a) fluorapatite glass-ceramic (E) or (b) feldspathic porcelain (V) and divided into four groups (CE, CV, LE and WV).

Effect of surface treatment and liner material on the adhesion between veneering ceramic and zirconia.

Fully sintered zirconia blocks, each with one polished surface, were treated with one of the followings: 1) no treatment, 2) airborne-particle abrasion with 50μm alumina, and 3) airborne-particle abrasion with 125μm alumina. Before veneering with glass ceramic, either liner Α or liner B were applied on the treated surfaces. All veneered blocks were subjected to shear force in a universal testing machine.

Measuring abutment convergence angles using stereovision dental image processing system.

Purpose: The purpose of this study was to develop a dental image processing system using a three-dimensional (3D) camera and stereovision technology. The reliability of the system for measuring axial wall convergence angles was evaluated.

Materials And Methods: The new system predicted 3D coordinate points from 2D images and calculated distances and angles between points.

The reliability of an easy measuring method for abutment convergence angle with a computer-aided design (CAD) system.

Purpose: The purpose of this study was to evaluate the intra-rater reliability and inter-rater reliability of three different methods using a drawing protractor, a digital protractor after tracing, and a CAD system.

Materials And Methods: Twenty-four artificial abutments that had been prepared by dental students were used in this study. Three dental students measured the convergence angles by each method three times.

A comparative study of gold UCLA-type and CAD/CAM titanium implant abutments.

Purpose: The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments.

Materials And Methods: An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening.

Effect of polishing and glazing on the color and spectral distribution of monolithic zirconia.

Purpose: The aim of this study was to evaluate the effect of polishing and glazing on the color and spectral distribution of monolithic zirconia.

Materials And Methods: Forty-five monolithic zirconia specimens (16.3 mm × 16.

Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems.

Purpose: 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 of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metal-ceramic FPDs.

Materials And Methods: Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone.

The influence of various core designs on stress distribution in the veneered zirconia crown: a finite element analysis study.

Purpose: The purpose of this study was to evaluate various core designs on stress distribution within zirconia crowns.

Materials And Methods: Three-dimensional finite element models, representing mandibular molars, comprising a prepared tooth, cement layer, zirconia core, and veneer porcelain were designed by computer software. The shoulder (1 mm in width) variations in core were incremental increases of 1 mm, 2 mm and 3 mm in proximal and lingual height, and buccal height respectively.

Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns.

Purpose: 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 this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident.

Clinical outcomes of magnesium-incorporated oxidised implants: a randomised double-blind clinical trial.

Objectives: This study evaluated implant stability and clinical outcomes obtained with magnesium-incorporated oxidised implants (Mg titanate) and compared them to those blasted magnesium-incorporated oxidised implants (blasted Mg titanate).

Patients And Methods: Mg titanate was manufactured using the microarc oxidation (MAO) process. To obtain blasted Mg titanate, the MAO process was performed after blasting with TiO₂ particles.

Initial in vitro bacterial adhesion on dental restorative materials.

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 restorative materials: zirconia (Zr), alumina-toughened zirconia (Al-Zr), type III gold alloy (Au), and cp-titanium (Ti). All the materials were polished until a mirror-like shine was achieved.

In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials.

Purpose: Fracture of the veneering material of zirconia restorations frequently occurs in clinical situations. The purpose of this in vitro study was to compare the fracture strengths of zirconia crowns veneered with various ceramic materials by various techniques.

Materials And Methods: A 1.

Bone formation around zirconia implants combined with rhBMP-2 gel in the canine mandible.

Objective: The aim of this study was to estimate the effects of zirconia implants and recombinant human bone morphogenetic protein-2 (rhBMP-2) gel on the acceleration of local bone formation and osseointegration in the canine mandible.

Materials And Methods: Four groups of 48 implants with identical geometry were installed in the mandibles of beagle dogs: alumina-blasted zirconia implants applied with rhBMP-2, alumina-blasted zirconia implants applied with demineralized bone matrix (DBM), alumina-blasted zirconia implants, and resorbable blast media-treated titanium (Ti) implants. For the first two groups, zirconia implants were inserted after the surgical sites were filled with rhBMP-2 or DBM gel.

The development of quantitative methods using virtual models for the measurement of tooth wear.

Tooth wear is an unavoidable process associated with aging. Currently, virtual three-dimensional dental models are widely used and provide an advantage for studying tooth wear. However, there are no wear assessment parameters using virtual tooth models for the quantitative analysis of wear.

The effect of preparation order on the crystal structure of yttria-stabilized tetragonal zirconia polycrystal and the shear bond strength of dental resin cements.

Objectives: The purpose of this study was to evaluate the effect of preparation order on the crystal structure of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and the shear bond strength of dental resin cements.

Methods: One-hundred fifty pre-sintered Y-TZP cylinders (Ø 9mm×13.5mm) were prepared and divided into three groups (control group, SBS group and SAS group).

A study on the fracture strength of collarless metal-ceramic fixed partial dentures.

Purpose: The objective of this study was to evaluate fracture strength of collarless metal-ceramic FPDs according to their metal coping designs.

Materials And Methods: Four different facial margin design groups were investigated. Group A was a coping with a thin facial metal collar, group B was a collarless coping with its facial metal to the shoulder, group C was a collarless coping with its facial metal 1 mm short of the shoulder, and group D was a collarless coping with its facial metal 2 mm short of the shoulder.

Variation in the total lengths of abutment/implant assemblies generated with a function of applied tightening torque in external and internal implant-abutment connection.

Aim: Settling (embedment relaxation), which is the main cause for screw loosening, is developed by microroughness between implant and abutment metal surface. The objective of this study was to evaluate and compare the relationship between the level of applied torque and the settling of abutments into implants in external and internal implant-abutment connection.

Material And Methods: Five different implant-abutment connections were used (Ext, External butt joint + two-piece abutment; Int-H2, Internal hexagon + two-piece abutment; Int-H1, Internal hexagon + one-piece abutment; Int-O2, Internal octagon + two-piece abutment; Int-O1, Internal octagon + one-piece abutment).

Implants and all-ceramic restorations in a patient treated for aggressive periodontitis: a case report.

A 23-year-old female with aggressive periodontitis was treated using dental implants and LAVA system. The severely compromised teeth were extracted irrespective of initial conservative periodontal treatment. An implant-supported overdenture with 4 implants was fabricated for the maxilla and all-ceramic restorations for the mandible.

Esthetic improvement in the patient with one missing maxillary central incisor restored with porcelain laminate veneers.

This article describes esthetic improvement in a patient with a missing maxillary left central incisor. Space analysis of the anterior dentition showed that minor tooth rearrangement was needed. Optimal space distribution for restorations was attained by orthodontic treatment.

Shear bond strength of veneering porcelain to zirconia and metal cores.

Statement Of Problem: Zirconia-based restorations have the common technical complication of delamination, or porcelain chipping, from the zirconia core. Thus the shear bond strength between the zirconia core and the veneering porcelain requires investigation in order to facilitate the material's clinical use.

Purpose: The purpose of this study was to evaluate the bonding strength of the porcelain veneer to the zirconia core and to other various metal alloys (high noble metal alloy and base metal alloy).

The effect of low temperature aging on the mechanical property & phase stability of Y-TZP ceramics.

Statement Of Problem: Recently Yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) has been introduced due to superior flexural strength and fracture toughness compared to other dental ceramic systems. Although zirconia has outstanding mechanical properties, the phenomenon of decrease in the life-time of zirconia resulted from degradation in flexural strength after low temperature aging has been reported.

Purpose: The objective of this study was to investigate degradation of flexural strength of Y-TZP ceramics after various low temperature aging treatments and to evaluate the phase stability and micro-structural change after aging by using X-ray diffraction analysis and a scanning electron microscope (SEM).