Surface roughness and optical characteristics evaluations after chairside adjustment of different zirconia types.

Statement Of Problem: Limited evidence is available for the effect of chairside adjustment using rotary cutting instruments on the surface roughness and optical properties of different zirconia types.

Purpose: To evaluate the effect of simulated adjustments on surface roughness and optical properties of different zirconia types.

Materials And Methods: Three Partially Stabilized Zirconia (PSZ) types based on mole percent yttria (Y) concentration from the same manufacturer (Katana; Kuraray) were used: 3Y-PSZ, 4Y-PSZ, and 5Y-PSZ.

Zirconia restoration types, properties, tooth preparation design, and bonding. A narrative review.

Objective: The purpose of this review was to provide dental professionals with information regarding the various types of zirconia restorations, their mechanical and optical properties, tooth preparation design, and bonding protocol in an effort to enhance the longevity and durability of zirconia restorations.

Overview: The yttria content of zirconia ceramics determines their classification. The mechanical and optical properties of each type are discussed, with an emphasis on the effect of yttria concentration on the properties of zirconia.

Strength and phase transformation of different zirconia types after chairside adjustment.

Statement Of Problem: Limited evidence is available for the effect of chairside adjustment using diamond instruments on different types of zirconia.

Purpose: The purpose of this in vitro study was to evaluate the effect of simulated adjustments on the biaxial flexural strength and phase transformation of 3 different zirconia types.

Material And Methods: Three zirconia types from the same manufacturer (Katana; Kuraray) were used: High Translucency (3Y-PSZ), Super Translucent Multi Layered (4Y-PSZ), and Ultra Translucent Multi Layered (5Y-PSZ).

Effectiveness of CAD/CAM technology: A self-assessment tool for preclinical waxing exercise.

Introduction: This study assessed the utility of CAD/CAM technology as a self-assessment tool for preclinical waxing compared to traditional student self-assessment to evaluate preclinical work.

Material And Methods: Thirty-seven students completed the wax-up of the maxillary left central incisor with the goal of recreating original anatomy and completed a traditional self-assessment. The original, unreduced cast and waxings were scanned with an intraoral scanner (E4D, Planmeca).

Effects of two Postprocessing Methods onto Surface Dimension of in-Office Fabricated Stereolithographic Implant Surgical Guides.

Purpose: To evaluate the effects of two postprocessing methods in terms of the overall, intaglio, and cameo surface dimensions of in-office stereolithographic fabricated implant surgical guides.

Materials And Methods: Twenty identical implant surgical guides were fabricated using a stereolithographic printer. Ten guides were postprocessed using an automated method.

Exploring the use of pulsed erbium lasers to retrieve a zirconia crown from a zirconia implant abutment.

Background: Removal of cement-retained implant fixed restorations when needed, can be challenging. Conventional methods of crown removal are time consuming and costly for patients and practitioners. This research explored the use of two different types of pulsed erbium lasers as a non-invasive tool to retrieve cemented zirconia crowns from zirconia implant abutments.

Intaglio Surface Dimension and Guide Tube Deviations of Implant Surgical Guides Influenced by Printing Layer Thickness and Angulation Setting.

Purpose: To measure overall intaglio dimensional and tube deviations of implant guides printed at 50 and 100 µm layer thickness at 0°, 45°, and 90° angulation using a stereolithographic (SLA) printer.

Materials And Methods: A surgical implant guide design from a subject missing a maxillary right central incisor, used as the original standard tessellation language (STL) were stereolithographically fabricated at each thickness and angulation, 50 and 100 µm layer thickness at 0°, 45°, and 90° angulation (n = 10 each group). The guide was then scanned using cone beam computed tomography.

Fracture rate of 188695 lithium disilicate and zirconia ceramic restorations after up to 7.5 years of clinical service: A dental laboratory survey.

Statement Of Problem: The use of ceramic materials has increased significantly because of high esthetic demands, low costs, and ease of fabrication. Long-term, clinically based evidence is scarce, and laboratory studies have limited relevance in determining clinical durability.

Purpose: The purpose of this dental laboratory survey was to evaluate the fracture rate of layered and monolithic lithium disilicate and zirconia single crowns and fixed partial dentures after up to 7.

Fracture of layered zirconia restorations at 5 years: A dental laboratory survey.

Statement Of Problem: The use of ceramic restorations has significantly increased in recent years because of their esthetic properties and the high cost of noble metals. However, given the lack of long-term clinical trials and the limitations of in vitro studies, the durability of ceramic restorations is still questionable.

Purpose: The purpose of this retrospective study was to determine the fracture rate of layered zirconia restorations at up to 5 years of clinical performance by using a dental laboratory survey model.

Effect of different treatments on the flexural strength of fully versus partially stabilized monolithic zirconia.

Statement Of Problem: Recent monolithic zirconia materials used for indirect restorations are predominantly fully stabilized zirconia with claims of enhanced optical properties. These restorations may behave differently from the conventional partially stabilized zirconia restorations, which may negatively affect some of the core properties required for restoration success.

Purpose: The purpose of this in vitro study was to evaluate and compare the effects of staining, airborne-particle abrasion, and artificial aging on the flexural strength of fully and partially stabilized zirconia material.

Influence of increment thickness on dentin bond strength and light transmission of composite base materials.

Objectives: Bulk-fill resin composites (BFCs) are gaining popularity in restorative dentistry due to the reduced chair time and ease of application. This study aimed to evaluate the influence of increment thickness on dentin bond strength and light transmission of different BFCs and a new discontinuous fiber-reinforced composite.

Materials And Methods: One hundred eighty extracted sound human molars were prepared for a shear bond strength (SBS) test.

Fracture rate of monolithic zirconia restorations up to 5 years: A dental laboratory survey.

Statement Of Problem: The demand for ceramic restorations has increased over the past years because of their esthetic properties and the high cost of noble metals. However, the lack of long-term clinical studies and the difficulty of interpreting in vitro studies have placed the durability of ceramic restorations in doubt.

Purpose: The purpose of this study was to determine the failure rate of monolithic zirconia restorations due to fracture up to 5 years of clinical performance.

Complete-arch implant-supported monolithic zirconia fixed dental prostheses: A systematic review.

Statement Of Problem: Monolithic zirconia prostheses are emerging as a promising option in the implant-based rehabilitations of edentulous patients, yet their clinical performance is not fully documented.

Purpose: The purpose of this systematic review was to assess the clinical performance of complete-arch implant-supported monolithic zirconia fixed dental prostheses.

Material And Methods: The electronic databases PubMed, Science Direct, and Cochrane Library were searched for clinical studies on complete-arch implant-supported monolithic zirconia fixed dental prostheses.

Impact of gastric acidic challenge on surface topography and optical properties of monolithic zirconia.

Objective: To evaluate the surface topography and optical properties of monolithic zirconia after immersion in simulated gastric acid.

Materials And Methods: Four partially stabilized (PSZ) and one fully stabilized (FSZ) zirconia materials were selected for the study: Prettau (PRT, Zirkonzahn), Zenostar (ZEN, Ivoclar), Bruxzir (BRX, Glidewell), Katana (KAT, Noritake) and FSZ Prettau Anterior (PRTA, Zirkonzahn). IPS e.

The effect of staining and vacuum sintering on optical and mechanical properties of partially and fully stabilized monolithic zirconia.

The effect of staining and vacuum sintering on optical properties and the bi-axial flexural strength of partially and fully stabilized monolithic zirconia (PSZ, FSZ) were evaluated. Disc-shaped specimens divided into three subgroups (n=15): non-stained, stained and non-stained with vacuum sintering. After staining and sintering, optical properties were evaluated using a reflection spectrophotometer and bi-axial flexural strength was tested using the piston-on-three balls technique.

Load-Bearing Capacity of Fiber-Reinforced Composite Abutments and One-Piece Implants.

Fiber-reinforced composites (FRC) can potentially help in a physiologic stress transmission due to its excellent biomechanical matching with living tissues. Novel one-piece FRC implants and abutments with two different fiber orientations were loaded until failure to assess the load-bearing capacity, fracture patterns, and precision of fit. The one-piece FRC implants showed significantly higher load-bearing capacity compared to FRC abutments regardless of the fiber orientation (p < 0.

Optical properties and light irradiance of monolithic zirconia at variable thicknesses.

Objectives: The aims of this study were to: (1) estimate the effect of polishing on the surface gloss of monolithic zirconia, (2) measure and compare the translucency of monolithic zirconia at variable thicknesses, and (3) determine the effect of zirconia thickness on irradiance and total irradiant energy.

Methods: Four monolithic partially stabilized zirconia (PSZ) brands; Prettau® (PRT, Zirkonzahn), Bruxzir® (BRX, Glidewell), Zenostar® (ZEN, Wieland), Katana® (KAT, Noritake), and one fully stabilized zirconia (FSZ); Prettau Anterior® (PRTA, Zirkonzahn) were used to fabricate specimens (n=5/subgroup) with different thicknesses (0.5, 0.

Degree of conversion of dual-polymerizing cements light polymerized through monolithic zirconia of different thicknesses and types.

Statement Of Problem: Monolithic zirconia restorations are increasingly common. Dual-polymerizing cements have been advocated for cementation. The opacious nature of zirconia restoration can attenuate light, compromising optimal resin polymerization and eventually restoration debonding.

In vitro assessment of the soft tissue/implant interface using porcine gingival explants.

The biologic seal of peri-implant soft tissue is crucial for long-term prognosis of oral implants. This in vitro study describes a novel tissue culture model using porcine gingival explants to evaluate the soft tissue/implant interface. Two different types of substrates were investigated: (a) plain polymer: BisGMA-TEGDMA (50-50 %) and (b) unidirectional fiber-reinforced composite (FRC).

Biofilm medium leads to apatite formation on bioactive surfaces.

Purpose: When investigating apatite formation on biomaterial surfaces, simulated body fluid (SBF) is used as an in vitro solution, however, it does not provide an appropriate environment for the growth of bacterial biofilm. The aim of the present study was to compare the bioactivity in terms of apatite formation on two bioactive glass (BAG) composite surfaces using both SBF and bacterial-biofilm growing medium (BM).

Methods: Polymer composite substrates with different percentages of BAG-particles (50% and 75% by weight) were prepared.

Blood and fibroblast responses to thermoset BisGMA-TEGDMA/glass fiber-reinforced composite implants in vitro.

Objectives: This in vitro study was designed to evaluate both blood and human gingival fibroblast responses on fiber-reinforced composite (FRC) aimed to be used as oral implant abutment material.

Material And Methods: Two different types of substrates were investigated: (a) Plain polymer (BisGMA 50%-TEGDMA 50%) and (b) FRC. The average surface roughness (Ra) was measured using spinning-disk confocal microscope.

The effect of exposed glass fibers and particles of bioactive glass on the surface wettability of composite implants.

Measurement of the wettability of a material is a predictive index of cytocompatibility. This study was designed to evaluate the effect of exposed E-glass fibers and bioactive glass (BAG) particles on the surface wettability behavior of composite implants. Two different groups were investigated: (a) fiber reinforced composites (FRCs) with different fiber orientations and (b) polymer composites with different wt.

The effect of high fiber fraction on some mechanical properties of unidirectional glass fiber-reinforced composite.

Objectives: This study was designed to evaluate the effect of an increase of fiber-density on some mechanical properties of higher volume fiber-reinforced composite (FRC).

Methods: Five groups of FRC with increased fiber-density were fabricated and two additional groups were prepared by adding silanated barium-silicate glass fillers (0.7 μm) to the FRC.