Composite-veneering of polyether-ether-ketone (PEEK): evaluating the effects of different surface modification methods on surface roughness, wettability, and bond strength.

This study aimed to evaluate the effects of different surface modification methods on the surface roughness, contact angle, and bond strength of composite-veneer materials of polyether-ether-ketone (PEEK). Fifty-five specimens (n = 11) with a size of 7 × 7 × 2 mm were cut out from PEEK discs. The specimens were divided into five groups with different surface treatments: no treatment (NO) (control group), sulfuric acid (SA), plasma (P), femtosecond laser (FS), and Nd-YAG laser (NY).

Turkish adaptation and validation of the Short-UPPS-P in adolescents and examination of different facets of impulsivity in adolescents with ADHD.

The short form of the Impulsive Behavior scale (S-UPPS-P) is a widely used scale to measure multiple impulsive personality traits; although it has been translated into many languages, no Turkish translation has been studied to date. Our study had two aims. First, we tested the validity and reliability of the Turkish version of the S-UPPS-P for adolescents.

Molecular level nucleation mechanisms of hierarchical MFI and MOR zeolite structures via non-stochastic pathways.

Understanding the chemical mechanism of crystal nucleation at the molecular level is crucial for the design of architectural structures of valuable materials in the future. In this study, it has been revealed that amorphous silicate precursors, which play a role in the nucleation processes of zeolitic frameworks, can be regularly fragmented in mass spectroscopy due to the hydroxyl functional groups in their molecular structures. In this way, by using the mass spectra acquired from LDI-TOF MS, the systematic evolution stages of a common 1D precursor converting to the 3D unit cells of MFI and MOR zeolite structures observed in the same reaction medium were constructed through a nucleation mechanism at the molecular level for the first time.

Preschoolers' Thoughts on the Concept of Time.

This study aimed to examine preschool children's epistemological views in the context of the concept of time via their drawings of the time machine. The study was conducted with 30 five-year-old children (17 girls and 13 boys) attending state and private preschools in the academic year 2018/2019. The data collection tools used in the study were the Test for Creative Thinking - Drawing Production TCT-DP, Children's Thoughts on Time Questionnaire (CTTQ) and Children's Epistemological Views Questionnaire (CEVQ).

Effect of storage time on mechanical properties of extended-pour irreversible hydrocolloid impression materials.

Statement Of Problem: Recent commercial extended-pour irreversible hydrocolloid impression materials (EPIHIMs) claim to maintain dimensional stability up to 120 hours. However, data regarding their mechanical properties and performance after 120 hours of storage are lacking.

Purpose: The purpose of this in vitro study was to test the elastic recovery, strain in compression, and tear strength properties of 5 commercially available EPIHIMs, immediately after preparation and after 120 hours of storage under specific storage conditions.

The effect of repetitive firings on the color of an alumina ceramic system with varying ceramic shade and thickness.

Objective: The color of all-ceramic restorations is one of the main criteria to achieve esthetical success. Many factors such as ceramic thickness, condensation techniques, firing temperature, and numbers can affect the final color of restoration. The purpose of this study was to investigate the color changes in alumina-based ceramic system according to ceramic shade and thickness during the multiple firings.

Effect of Various Treatment Modalities on Surface Characteristics and Shear Bond Strengths of Polyetheretherketone-Based Core Materials.

Purpose: To investigate the effect of different surface treatments on the surface roughness (Ra), wettability, and shear bond strength of polyetheretherketone (PEEK) to composite resin.

Materials And Methods: One hundred ninety eight PEEK specimens were divided into six groups (n = 33). Specimen surfaces were treated with the following surface treatment modalities: silicoating (CoJet), acetone treatment, acid etching (H SO ), airborne particle abrasion (Al O ), laser irradiation (Yb:PL laser), and the nontreated surface serving as the control.

Microleakage of inlay ceramic systems luted with self-adhesive resin cements.

Purpose: To evaluate the microleakage of Cerec 3, IPS e.max Press, and Turkom-Cera inlays cemented with three self-adhesive resin cements.

Materials And Methods: Ninety standardized class III MOD cavities were prepared in intact human mandibular third molars.

Effects of implant angulations and attachment configurations on the retentive forces of locator attachment-retained overdentures.

Purpose: The aim of this study was to evaluate the effects of different implant angulations and attachment configurations on the retentive forces of locator attachment-retained overdentures over a simulated time period of 6 months.

Materials And Methods: Two acrylic resin models (models 1 and 2) were fabricated to represent an edentulous mandible. In model 1, the midline implant (in the central region) was vertical and the other two implants (in the canine regions) were 20 degrees divergent from the midline, reaching a total divergence of 40 degrees.

A technique for retrofitting a metal ceramic crown to an attachment-retained removable partial denture: a clinical report.

In dental applications, precision attachments have been used to retain removable partial dentures (RPDs) for several decades. Various types of extracoronal attachments are commonly used in combination with fixed partial dentures and RPDs to achieve retention and stability. Fracture of the framework, fracture of the roots or teeth, and irretrievable decrease of retention are common reasons for a failed attachment-retained RPD.

A technique for fabrication of an extracoronal attachment-retained removable partial denture to fit an existing fixed partial denture.

Precision attachments have been used for many years to retain removable partial dentures (RPDs). Common reasons for a failed attachment-retained RPD are fracture of the framework, fracture of the roots or teeth, and irretrievable decrease of retention. When an RPD framework major connector has been fractured, it should be remade.

A simplified technique for solving the transfer problem of implant-supported fixed partial dentures for patients with microstomia.

Techniques for treating a fully or partially edentulous patient with microstomia have been developed to overcome the challenge of accessing the oral cavity. Management of the problems associated with providing implant-supported fixed partial dentures for patients with microstomia has not been well reported. This article describes a solution for the transfer problem that occurs when making an impression of an implant-supported fixed partial dentures for patients with microstomia.

Replacement of a lost removable partial dental prosthesis using ball-attachment analogs: a clinical report.

Attachment-retained removable partial dental prostheses (RPDPs) may be lost. Although in such situations, the RPDP should be remade, no method has yet been described for replacing lost attachment-retained RPDPs. This report describes a method for fabrication of a replacement for a lost maxillary RPDP using ball-attachment analogs.

A technique for constructing a new maxillary overdenture to a nonretrievable implant connecting bar.

The most frequent mechanical complications of the bar-implant-retained overdentures are loosening of the bar screws and the need to reactivate the retentive clips. This article describes a technique to construct a new maxillary overdenture to a nonretrievable round-profile implant connecting bar with 2 distally placed attachments. The retainer round-profile bar was nonretrievable due to a worn retaining screw head.

Symphyseal bone cylinders tapping with the dental implant into insufficiency bone situated esthetic area at one-stage surgery: a case report and the description of the new technique.

Periodontal defects and trauma at the anterior maxillary region can cause a severe alveolar ridge deficiency resulting in an unesthetic view. Ideal implant positioning can be compromised by inadequate alveolar bone in terms of height and width. Reconstruction of osseous defects with autogenous bone allows ideal implant positioning and creates a more natural soft and hard tissue profile, which influences esthetic crown anatomy at the anterior maxillary region.

Fabrication of zirconium primary copings to provide retention for a mandibular telescopic overdenture: a clinical report.

Because of their strength, zirconia ceramics may be used to restore removable partial denture abutments. This carries the advantages of elimination of the galvanic current between primary and secondary copings, along with thermal protection of abutment teeth. This article describes the fabrication of zirconium primary copings to provide retention for a mandibular telescopic overdenture.

The effect of ceramic thickness and number of firings on the color of two all-ceramic systems.

Statement Of Problem: All-ceramic restorations have been advocated for superior esthetics, and various materials have been used to improve ceramic core strength, but there is a lack of information on how color is affected by different core substructures and fabrication procedures.

Purpose: The purpose of this study was to evaluate the effects of various dentin ceramic thicknesses and repeated firings on the color of lithium disilicate glass-ceramic (IPS e.max Press) and zirconium-oxide (DC-Zirkon) all-ceramic systems.

Technical tips for constructing a maxillary implant-supported overdenture by using a double-impression technique.

Implant-supported overdentures have become a popular treatment option for completely edentulous patients. Functional loads should be optimally distributed to the mucosa and the abutments. This article describes a functional double-impression technique for fabricating a maxillary implant-supported overdenture.

The effect of repeated firings on the color of an all-ceramic system with two different veneering porcelain shades.

Statement Of Problem: Color matching between a restoration and natural teeth is a common clinical problem. Despite careful shade selection, color of the restoration may be affected by fabrication procedures.

Purpose: The purpose of this study was to determine the color changes of an all-ceramic restoration with 2 different veneering porcelain shades after repeated firings.

Fabrication of implant-assisted restorations utilizing functional impression techniques: case reports.

This article describes the fabrication of implant-supported overdentures and removable partial dentures attached to anterior fixed partial dentures utilizing impression techniques to transfer the position of implants and record soft tissue areas in a functional state.

Fabrication of a maxillary implant-supported overdenture retained by two cemented bars: a clinical report.

Parallel placement of 2 separate bars may be indicated in patients where bone is available in the posterior part of the maxilla. Bars and stud attachments are the primary attachment systems compatible with the majority of the implant systems currently available; however, treatment planning in certain situations may be challenging due to the component available with the implant system used. This report describes the fabrication of a cemented bar design for use in situations when the components of the implant system are inadequate for fabrication of a screw-retained bar.

The effect of ceramic thickness and number of firings on the color of ceramic systems: an in vitro study.

Statement Of Problem: Although all-ceramic restorations are widely used, there is a lack of information on how color is affected by fabrication procedures. Color matching problems may be encountered in a definitive restoration despite careful shade selection.

Purpose: The aim of this study was to evaluate the effect of dentin ceramic thickness and repeated firings on the color of glass-infiltrated aluminum-oxide (In-Ceram) and leucite-reinforced (IPS Empress) all-ceramic systems using a colorimeter.

Effects of silica coating and silane surface conditioning on the bond strength of metal and ceramic brackets to enamel.

Objective: To evaluate the effect of tribochemical silica coating and silane surface conditioning on the bond strength of metal and ceramic brackets bonded to enamel surfaces with light-cured composite resin.

Materials And Methods: Twenty metal and 20 ceramic brackets were divided into four groups (n = 10 for each group). The specimens were randomly assigned to one of the following treatment conditions of the metal and ceramic brackets' surface: (1) tribochemical silica coating combined with silane and (2) no treatment.

Use of a resin-bonded fixed partial denture with a removable pontic during the osseointegration period of a single implant treatment: a clinical report.

This clinical report describes the construction of a resin-bonded fixed partial denture with a removable pontic during the healing period of a single implant treatment. This design improves maintenance of oral hygiene.

A functional impression technique for an implant-supported overdenture: a clinical report.

Overdenture support is derived from oral mucosa and retained roots or implants. Functional loads must be distributed, optimally, between the supporting structures for the success of overdentures; such a distribution may be obtained with the use of functional impression procedures. A functional impression technique is described for the fabrication of an implant-supported overdenture.