Evaluation of the effects of different surface modification methods on the bond strength of high-performance polymers and resin matrix ceramics.

Objectives: The purpose of this in vitro study was to investigate the effects of various surface treatment methods on the shear bond strength of self-adhesive resin cement to polymer-infiltrated materials.

Materials And Methods: One hundred twenty-eight polymer-infiltrated specimens (n = 32) for four different computer aided design-computer-aided manufacturing (CAD-CAM) materials, polyether ether ketone (PEEK) (PE), polyether ketone ketone (PEKK) (PK), composite resin nanoceramic (Cerasmart) (CS), and polymer-infiltrated ceramic network (PICN) (VITA ENAMIC) (VE) were milled from CAD-CAM blocks. They were divided into two groups (n = 16) in terms of surface treatments: airborne-particle abraded (AA) or silica-coated (SC) and two subgroups (n = 8) according to adhesive application or no adhesive.

A comparison of the fracture resistance of premolars without a ferrule with different post systems.

Statement Of Problem: Which type of post improves the performance of endodontically treated mandibular premolars without a ferrule remains unclear.

Purpose: The purpose of this in vitro study was to compare the restoration of endodontically treated mandibular premolars without a ferrule by using different post systems.

Material And Methods: Thirty extracted mandibular premolars were endodontically treated, and their crowns removed.

Evaluation of the effect of different polishing systems on the surface roughness of dental ceramics.

Statement Of Problem: How the finishing and polishing of ceramic restorations may affect their surface properties is unclear.

Purpose: The purpose of this in vitro study was to evaluate the effect of different polishing systems on the surface roughness of dental ceramics by using a profilometer, an environmental scanning electron microscope (ESEM), and an atomic force microscope (AFM).

Material And Methods: Sixty square specimens (2×14×14 mm) of 3 popular ceramic systems (monolithic zirconia and feldspathic-based ceramic containing feldspar and fluorapatite) were prepared, glazed, and assigned to 1 of the 5 groups: a control group with no additional treatment after the glaze; in the other groups, the glaze layer was removed, and the surfaces were polished by using 4 different ceramic polishing systems (OptraFine, Shofu, Meisinger, or Komet).

The Bond Strength of Nanohybrid and Nanoceramic Composites to Feldspathic Porcelain.

Background: Porcelain fracture is the most important problem in fixed prosthetic restorations. The replacement of fractured restoraions isn't often prefer by patients and dentists. Intraoral repair of fractured porcelain is a big alternative for patient and dentist.

Effect of MDP-Based Silane and Different Surface Conditioner Methods on Bonding of Resin Cements to Zirconium Framework.

Purpose: To determine the shear bond strength (SBS) between zirconium framework and resin cements after different surface conditioner methods and after application of 10-methacryloyloxydecyl dihydrogen phosphate (MDP) based silane and a bonding agent mix.

Materials And Methods: 128 disc-shaped zirconium-oxide specimens were prepared. Specimens were placed in autopolymerizing acrylic resin.

The effect of various occlusal reduction levels on postoperative pain in teeth with symptomatic apical periodontitis using computerized analysis: a prospective, randomized, double-blind study.

Objective: The objective of this study was to evaluate the effect of various occlusal reduction levels on the postoperative pain in teeth diagnosed as symptomatic apical periodontitis by using a computerized analysis system.

Materials And Methods: Thirty-nine molar teeth with symptomatic apical periodontitis were included. After the root canal preparation and filling was performed, the subjects were divided into three groups according to the level of occlusal reduction determined by using T-Scan (T-Scan III for Windows, Tekscan Inc.

Effect of sealer coating and storage methods on the surface roughness of soft liners.

Statement Of Problem: A soft lining is applied under a removable prosthesis for various reasons. The porosity of the lining material may increase colonization by microorganisms and cause tissue inflammation.

Purpose: The purpose of this in vitro study was to evaluate the effect of sealer coating on the surface roughness of soft lining materials under 4 different conditions.

The Effect of Sandblasting, Er:YAG Laser, and Heat Treatment on the Mechanical Properties of Different Zirconia Cores.

Objective: The purpose of this study was to evaluate the effect of surface and heat treatments on the mechanical properties and phase transformation of yttria-stabilized tetragonal zirconia (Y-TZP) materials.

Background Data: Zirconia is exposed to several treatments during dental application process. Knowing the effect of applied treatments on zirconia is essential for clinical success.

Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin.

The purpose of the present study was to evaluate the effects of different repair resins and surface treatments on the repair strength of a polyamide denture base material. Polyamide resin specimens were prepared and divided into nine groups according to the surface treatments and repair materials. The flexural strengths were measured with a 3-point bending test.

Effects of tongue movements on lingual sulcus depth while border molding in mandibular complete dentures.

Background: In general, people speak and swallow frequently in their daily lives rather than making exaggerated tongue movements.

Aim: The aim was to compare the effect of tongue movements on lingual sulcus depth, during the border molding process of impression making of mandibular complete dentures.

Settings And Design: In total, 32 double master impressions were made.

Evaluation of the flexural strength of dual-cure composite resin cements.

The aim of this study was to evaluate of flexural strength of some adhesive resin cements. Three dual-cure composite resin cements (Nexus 3; Variolink II, Panavia F) were prepared. The manufacturer's mixing directions for the cements were followed.

The effect of staining solutions on the color stability of provisional prosthodontic materials.

Objectives: The aim of this study was to evaluate the effects of staining solutions on the color stability of self-cure provisional resin materials.

Methods: The specimens were prepared for each of three auto-polymerized bis-acryl resin and auto-polymerized methyl methacrylate provisional resin material. The baseline color values were measured with a colorimeter according to the CIE L(*)a(*)b(*) color scale.

Effects of different solutions on the surface hardness of composite resin materials.

In this study, the surface hardness of five light-cured composite resins were evaluated, namely: filled (Estelite), nanofil (AElite), unfilled (Valux Plus), hybrid (Tetric ceram), and Ormocer-based (Admira) composite resins. The microhardness values of composite specimens were measured at the top and bottom surfaces after 24 hours or 30 days of immersion in different solutions (tea, coffee, Turkish coffee, mouthwash, cola, and distilled water). Comparisons were made with univariate analysis of variance and Duncan's multiple range test.

Radiological evaluation of changes in the gonial angle after teeth extraction and wearing of dentures: a 3-year longitudinal study.

Objective: The aim of this study was to evaluate the gonial angle measurements of 20 adult patients made from panoramic radiographs and to assess differences from dentate state to edentate state-with dentures.

Study Design: A total of 100 panoramic radiographs of 20 patients were evaluated, and gonial angle sizes were measured. Panoramic radiographs were made while the patients were dentulous and in the first month, sixth month, first year, and third year after tooth extraction and wearing dentures after a 2-3-month healing period.

A comparison of the fracture resistance of core materials using different types of posts.

Objective: The purpose of this in vitro study was to determine the fracture resistance of 3 core materials (silver amalgam, resin composite, glass-ionomer cement) supported by 1 custom cast post (nickel-chromium alloy) and 2 prefabricated posts (Radix and Safix posts).

Method And Materials: A sum of 45 recently extracted single-rooted human incisors and canines were placed in 0.5% sodium hypochlorite.

Evaluation of the solubility of dental cements in artificial saliva of different pH values.

The aim of this study was to determine the solubility of dental cements in artificial saliva of different pH values. A total of 180 specimens--20 specimens (20 mm diameter x 1.5 mm thickness) for each dental cement-were prepared.

The investigation of solubility values,water sorption and bond strength of auto-polymerising and heat-polymerising acrylic resin materials.

In this study the solubility, water sorption and the bond strength of auto-polymerising and heat-polymerising acrylic resins were investigated. Two auto-polymerising and five heat polymerising acrylic resin materials were used for this study. Thirty-five specimens were prepared (50 mm in diameter and 0.

The effect of different solutions on the bond strength of soft lining materials to acrylic resin.

In this study, we investigated the effect of different solutions--coffee, tea, Turkish coffee, artificial saliva, mouthwash, denture cleanser, and distilled water--on the bond strength of soft lining materials (one acrylic- and three silicone-based) to acrylic resin. Acrylic specimens (40x10x10 mm) were prepared for the bond strength test. The specimens were stored in different solutions and tested after 24 hours, seven days, and 30 days.

Determination of the occlusal vertical dimension: use of maxillary and mandibular posterior teeth measurement in edentate subjects.

Determination of the occlusal vertical dimension (OVD) is one of the most important steps in making dentures. Various techniques have been used to make these measurements. Unfortunately, there is no universally accepted method available for clinical use.

The repair methods for fractured metal-porcelain restorations: a review of the literature.

Metal-ceramic restorations are popular in restorative dentistry. Although metal-ceramic restorations are universally accepted, they have such disadvantages as occasional fractures of the veneer. Fracture and loss of the veneering ceramic of a fixed partial denture is troublesome.

Influence of a thickness and processing method on the linear dimensional change and water sorption of denture base resin.

The purpose of this study was to evaluate the influence of a thickness and processing method on linear dimension change and water sorption in a denture base resin after storage in water for 24 hours, one week, and four weeks. Sixty wax specimens 65 mm long and 10 mm wide were fabricated in three thicknesses, 1.5, 3, and 4.

Thermal and pH changes, and dimensional stability in irreversible hydrocolloid impression material during setting.

Present study the relation between pH, thermal changes and dimensional stability during setting of irreversible hydrocolloid impression materials was investigated. Ten specimens of each product were prepared for different measurements: Thermal, pH changes and dimensional stability (mass and linear). Thermal and pH readings for 20 min and dimensional measurements for a 2 hr period were taken after mixing.