Alternative Treatments for Zirconium Oxide to Compare Commonly Used Surface Treatments to Determine Which Has the Least Effect on the Phase Transformation.

Traditional mechanical processing of zirconium leads to an unfavorable transformation, from a metastable tetragonal phase to a monoclinic phase (t→m), which weakens the structure of the material and subsequently leads to damage to the prosthetic restoration. The aim of this research is to compare commonly used surface treatments to determine which has the least effect on t→m. Thirty cylindrical samples made of sintered zirconium were divided into six groups based on the following treatments: polishing, grinding, sandblasting, chemical etching, laser structuring or dry plasma etching.

Correction: Klimek et al. A Comparison of the Structure and Selected Mechanical Properties of Cr/Co Alloys Obtained by Casting and Selective Laser Melting. 2024, , 61.

In the original publication [...

A Comparison of the Structure and Selected Mechanical Properties of Cr/Co Alloys Obtained by Casting and Selective Laser Melting.

Selective laser melting (SLM) technologies are becoming increasingly popular. The aim of the work is to compare the metallographic structure, hardness, and selected strength properties of alloys obtained by casting and by SLM, with a particular emphasis on fatigue strength. Twenty Cr/Co alloy bars were made by casting or SLM, and samples of appropriate dimensions were prepared for individual tests.

Effect of Sandblasting Parameters and the Type and Hardness of the Material on the Number of Embedded AlO Grains.

Background: Is abrasive blasting accompanied by the phenomenon of driving abrasive particles into the conditioned material?

Methods: Three hundred and fifteen cylindrical disks of three types of metal alloy (chromium/cobalt, chromium/nickel, titanium, and sintered zirconium dioxide) were divided into four groups (n = 35) and sandblasted at pressures of 0.2, 0.4, or 0.

An Evaluation of the Mechanical Properties of a Hybrid Composite Containing Hydroxyapatite.

There is currently a lack of scientific reports on the use of composites based on UDMA resin containing HAp in conservative dentistry. The aim of this study was therefore to determine the effect of hydroxyapatite content on the properties of a hybrid composite used in conservative dentistry. This paper compares a commercial hybrid composite with experimental composites treated with 2% by weight (b/w), 5% b/w, and 8% b/w hydroxyapatite.

Evaluation of the Effect of the Addition of Hydroxyapatite on Selected Mechanical and Tribological Properties of a Flow-Type Composite.

(1) Background: The aim of the study was to determine the effect of modification with sintered hydroxyapatite (HAp) on selected mechanical and tribological properties of a flow-type composite. (2) Methods: Samples in the shapes of cuboidal beams ( = 120) and cylinders ( = 120) with the proper dimensions were prepared from a standard flow-type composite and others with the addition of 2% wt., 5% wt.

Clinical longevity and trend analysis of 801 ultrathin ceramic veneers: A clinical cohort study.

Statement Of Problem: Whether ultrathin ceramic veneers are a suitable treatment alternative to conventional ceramic veneers is unclear.

Purpose: The purpose of this prospective clinical cohort study was to evaluate the efficacy and longevity of nonpreparation and minimally invasive ceramic veneers and the influence of existing restorations and ceramic type and to define the relationship between the number of veneers placed on different teeth and in different locations, as well as age and sex correlations.

Material And Methods: A total of 801 veneers were placed on incisors, canines, and premolars on maxillary and mandibular teeth between January 2011 and August 2019 (ABR number: RNN/92/19/KE).

The Influence of Material Type and Hardness on the Number of Embedded Abrasive Particles during Airborne-Particle Abrasion.

(1) Background: This paper aims to determine the influence of hardness on the number of abrasive material grains (SiC) embedded on the surface metal alloys and ZrO during abrasion. (2) Methods: Cylindrical samples were created: 315 made of Cr/Co, Ni/Cr or Ti, and 315 made of sintered ZrO- 3TPZ-Y. These were divided into four groups (each = 35 samples), and were treated with SiC grain sizes 50, 110, and 250 µm at pressures 0.

A prospective comparative analysis of the survival rates of conventional vs no-prep/minimally invasive veneers over a mean period of 9 years.

Objectives: The present study compares the survival rates of 186 conventional and no-prep/minimally invasive porcelain veneers in 35 patients over a mean period of 9 years.

Materials And Methods: The veneers were placed on the incisors, canines, and premolars in 35 patients between January 2009 and December 2010. Fourteen patients received 84 conventional veneers, and 21 patients received 102 no-prep/minimally invasive veneers.

Effect of zirconia surface treatment on its wettability by liquid ceramics.

Statement Of Problem: The wettability of the framework by liquid ceramics is important in ensuring a suitable bond between veneering ceramics and zirconia.

Purpose: The purpose of this in vitro study was to examine the dependence of the wetting angle on temperature to determine the transition temperature from nonwettable to wettable states and to calculate the values of the relative wetting forces of the milled surfaces.

Material And Methods: Fifty zirconia cylinders were divided into 5 groups (n=10) and subjected to the following treatments: milling, grinding, polishing, and airborne-particle abrasion with AlO or SiC.

The Use of the Finite Elements Method (FEM) to Determine the Optimal Angle of Force Application in Relation to Grooves Notched into a Zirconia Coping with the Aim of Reducing Load on a Connection with Veneering Ceramic.

Objective Of Study: To investigate, using the FEM, the influence of different notching angles on a zirconium dioxide coping with the aim of establishing the optimal connection conditions with veneering ceramic.

Materials And Methods: To calculate the stresses in the connection between zirconia coping and veneering ceramic, a model comprising grooves cut perpendicular was adopted. Such a notch profile was used to design the shape and spacing of the grooves on an FEM model simulating a zirconium dioxide coping.

The Use of the FEM to Identify the Optimal Groove Dimensions Ensuring the Least Stressed Connection between a Zirconia Coping and Veneering Ceramic.

To examine the influence of coping notches with varying groove widths and depths on the quality of the connection with ceramic. Ten rectangular sintered zirconia (3Y-TZP) samples were etched with a neodymium-yag laser Nd:YAG. Then, a profilometer was used to test the depths and spacing of the grooves.

Multistage implantology-orthodontic-prosthetic treatment: A case report.

Background And Overview: Patients increasingly expect esthetic and comfortable fixed restorations on implants, are aware how important it is to maintain healthy tooth tissue, and draw attention to the final result of treatment.

Case Description: In this case report, the authors describe implantology-orthodontic-prosthetic treatment provided on a patient who reported symptoms of head, back, and neck pain and had an impaired prosthetic plane, lack of space for prosthetic crowns after the introduction of the implants and no good treatment plan, and broken tooth roots of the mandibular anterior teeth. In addition, the patient wanted to correct the shape and color of the rest of her teeth.

Effect of Air Abrasion on the Number of Particles Embedded in Zironia.

Unlabelled: : Determination of the number of abrasive particles embedded in the zirconia surface after variable parameters of treatment.

Methods: One hundred thirty cylindrical disks made from zirconia were divided into 7 groups ( = 10): one control and six test groups treated by air abrasion using Al₂O₃ or SiC with grain sizes: 60, 110, 250 μm with a working pressure of 0.2 or 0.

Effect of hydrofluoric acid concentration and etching duration on select surface roughness parameters for zirconia.

Statement Of Problem: The surface of zirconia is resistant to chemical treatment. Roughening the surface of densely sintered zirconia still poses a challenge in dentistry.

Purpose: The purpose of the study was to examine the effects of hydrofluoric acid on the quality of surface roughening of zirconia.