Influence of Surface Modifications on Bacterial Adherence to Implant Abutment Materials.

The purpose of this study was to investigate the effects of various titanium and zirconia polishing protocols on the colonization of oral bacteria. Titanium and zirconia discs were divided into five groups: unpolished (control, UNP) and polished with Brownie only (BRO), Brownie plus Greenie (BPG), Brownie plus Greenie plus Supergreenie (BGS), and CeraMaster Coarse plus CeraMaster polishing tips (CER). The samples were sterilized and immersed in unstimulated saliva, then incubated in a liquid suspension of Streptococcus gordonii (S gordonii).

A Critical Period for Robust Curriculum-Based Deep Reinforcement Learning of Sequential Action in a Robot Arm.

Many everyday activities are sequential in nature. That is, they can be seen as a sequence of subactions and sometimes subgoals. In the motor execution of sequential action, context effects are observed in which later subactions modulate the execution of earlier subactions (e.

Extracellular Matrix Protein 1 Gene Mutation in Turkish Patients with Lipoid Proteinosis.

Background: Lipoid proteinosis (LP) is a rare autosomal recessive genodermatosis characterized by mucocutaneous lesions and hoarseness of voice that develop in early childhood. LP is caused by mutation in the extracellular matrix protein 1 () gene, which is located on 1q21.2.

Evaluation of Dual-Cure Resin Cement Polymerization under Different Types and Thicknesses of Monolithic Zirconia.

Purpose: The aim of the present study was to investigate the effects of the type and thickness of the zirconia material on the microhardness of the underlying dual-cure resin cement.

Materials And Methods: Eight disk-shaped zirconia specimens with a 4-mm diameter and four varying thicknesses (0.5, 1.

Shear bond strength of luting cements to fixed superstructure metal surfaces under various seating forces.

Purpose: In this study, the shear bond strengths (SBS) of luting cements to fixed superstructure metal surfaces under various seating forces were investigated.

Materials And Methods: Seven different cements [Polycarboxylate (PCC), Glass-Ionomer (GIC), Zinc phospahate (ZPC), Self-adhesive resin (RXU), Resin (C&B), and Temporary cements ((RXT) and (TCS))] were bonded to a total number of 224 square blocks (5×5×3 mm) made of one pure metal [Titanium (CP Ti) and two metal alloys [Gold-Platinum (Au-Pt) and Cobalt-Chrome (Co-Cr)] under 10 N and 50 N seating forces. SBS values were determined and data were analyzed with 3-way ANOVA.

Influences of Implant and Framework Materials on Stress Distribution: A Three-Dimensional Finite Element Analysis Study.

Purpose: The aim of this study was to analyze and compare the stress distribution patterns of different implant and restorative materials in the supporting tissue and implants.

Materials And Methods: Twelve different implant/bone models were created using SolidWorks 2015 software (SolidWorks Corp) and analyzed using the finite element method. Straumann Bone Level implants with zirconia abutments and single-piece Straumann PURE Ceramic implants (Institute Straumann) restored with lithium disilicate glass-ceramic and zirconia ceramic cement-retained crowns were evaluated.

Influence of monolithic lithium disilicate and zirconia thickness on polymerization efficiency of dual-cure resin cements.

Objective: To evaluate the influence of anterior monolithic zirconia and lithium disilicate thickness on polymerization efficiency of dual-cure resin cements.

Materials And Methods: Twelve ceramic disks (4.0-mm diameter) with thicknesses of 0.

Evaluation of five CAD/CAM materials by microstructural characterization and mechanical tests: a comparative in vitro study.

Background: Polymer infiltrated ceramics and nano-ceramic resins are the new restorative materials which have been developed in order to enhance the adverse properties of glass-matrix ceramics and resin composites. The aim of the present in vitro study was to evaluate the characteristics of various CAD/CAM materials through mechanical, microstructural, and SEM analysis.

Methods: Five test groups (n = 22) were formed by using the indicated CAD/CAM blocks: VITA Enamic (VITA Zahnfabrik), Lava Ultimate (3 M ESPE), IPS e.

Effect of thickness and surface modifications on flexural strength of monolithic zirconia.

Statement Of Problem: A recommended minimum thickness for monolithic zirconia restorations has not been reported. Assessing a proper thickness that has the necessary load-bearing capacity but also conserves dental hard tissues is essential.

Purpose: The purpose of this in vitro study was to evaluate the effect of thickness and surface modifications on monolithic zirconia after simulated masticatory stresses.

Minimally Invasive Surgical Approach to Complicated Recurrent Pilonidal Sinus.

Pilonidal sinus is considered as a simple and frequently occurring disease localized at the sacrococcygeal area. However, at the intergluteal region, it can often turn into a chronic and complicated disease. In some cases, it can fistulize up to the gluteal region and appear at the secondary orifices.

Evaluation of surface topography of zirconia ceramic after Er:YAG laser etching.

Objective: The aim of this study is to evaluate the effect of Erbium: yttrium-aluminum-garnet (Er:YAG) laser with different pulse lengths on the surface roughness of zirconia ceramic and airborne particle abrasion.

Background Data: Er:YAG laser treatment is expected to be an alternative surface treatment method for zirconia ceramics; however, the parameters and success of the application are not clear.

Methods: One hundred and forty zirconia discs (diameter, 10 mm; thickness, 1.

Adhesion of 10-MDP containing resin cements to dentin with and without the etch-and-rinse technique.

Purpose: This study evaluated the adhesion of 10-MDP containing self-etch and self-adhesive resin cements to dentin with and without the use of etch-and-rinse technique.

Materials And Methods: Human third molars (N=180) were randomly divided into 6 groups (n=30 per group). Conventional (Panavia F2.

Simultaneous Replacement of Maxillary Central Incisors with CEREC Biogeneric Reference Technique: A Case Report.

Biogeneric Reference Technique (BRT) of the CEREC 3D v.3.8 software is an effective technique for single anterior ceramic crowns because it provides computer-controlled match of the tooth form to the contralateral tooth.

Evaluation of hardness and fracture toughness, coupled with microstructural analysis, of zirconia ceramics stored in environments with different pH values.

The aim of this study was to evaluate the effects of pH changes in the oral cavity on the mechanical properties of zirconia and feldspathic ceramics. Bilayered zirconia-feldspathic samples were prepared from three different commercial brands of Y-TZP blocks: Zirkonzahn, Cercon, and Everest. Samples were stored in artificial saliva with different pH values (3.

Influence of zirconia base and shade difference on polymerization efficiency of dual-cure resin cement.

Purpose: The aim of this study was to investigate the polymerization efficiency of dual-cured resin cement beneath different shades of zirconia-based feldsphathic ceramic restorations.

Materials And Methods: Five translucent zirconia (Zirkonzahn) discs (4.0-mm diameter, 1.

Clinical efficacy of the Vector system in excess cement removal during fixed prosthodontic treatment.

Objective: To evaluate the clinical effectiveness of the Vector system (Durr Dental) in excess cement removal from subgingival margins during fixed prosthodontic treatment.

Method And Materials: A total of 41 subjects, each in need of a minimum of 2 metal-ceramic crowns in different quadrants, took part in this study. Altogether, 156 abutment teeth were randomly assigned into 2 groups: In one group, excess cement was removed with the Vector system after cementation of provisional and permanent restorations, while in the other group, handheld instruments were used for this procedure.

Influence of different surface treatments on the short-term bond strength and durability between a zirconia post and a composite resin core material.

Statement Of Problem: Reliable bonding between zirconia posts and composite resin core materials is difficult to achieve because of the smooth surface texture and lack of silica content of zirconia posts.

Purpose: The purpose of this study was to evaluate the effect of different surface treatments on the short-term bond strength and durability between a zirconia post and a composite resin core material.

Material And Methods: Eighty zirconia posts were divided into 4 groups (n=20).

Analytic view to concordance between electrocochleography and caloric test in Meniere's disease.

We aimed to investigate if there is a concordance between summation potential (SP)/action potential (AP) ratio and unilateral weakness in patients with definite-Meniere's disease. There were two groups, a group of unilateral definite-Meniere patients who received no treatment and another group of control subjects. Twenty-six patients were identified as complying with the defined criteria.

Effect of cochlear reserve on postoperative outcome in otosclerosis.

Patients with elevated bone conduction (BC) thresholds are not considered a good candidate for otosclerosis surgery. Sometimes, it might be difficult to decide to operate these patients considering relatively poor cochlear function. However, viewpoints may vary among otologists.

Shear bond strengths of two composite core materials after using all-in-one and single-bottle dentin adhesives.

Purpose: The purpose of this study was to compare the shear bond strengths of 2 composite core materials after using all-in-one and single-bottle dentin bonding materials.

Material And Methods: The occlusal surfaces of 100 extracted, intact human third molars were ground to expose a flattened area of dentin and polished with 600-grit silicon carbide paper. Specimens were divided into 5 main groups (n= 20).

The effect of two polishing pastes on the surface roughness of bis-acryl composite and methacrylate-based resins.

Statement Of Problem: A highly polished restoration surface is necessary to promote a plaque-free environment.

Purpose: The purpose of this study was to compare the surface roughness of 3 different bis-acryl composite-based and 3 different methyl methacrylate-based provisional crown and fixed partial denture resins after being polished with aluminum oxide and diamond paste.

Material And Methods: Six different materials were used (Iso-Temp, Protemp II, Structer 2, Dentalon Plus, Tab 2000 Kerr, Temdent).

Shear bond strength of amalgam reinforced with a bonding agent and/or dentin pins.

Statement Of Problem: The use of dentin pins can cause crazing in dentin. Bonding agents represent a more conservative approach to retention but may not ensure a comparable shear bond strength.

Purpose: This study compared the shear bond strength of amalgam to dentin with the application of dentin pins, a bonding agent, and a combination of both forms of retention.