Impact of surface finishes on the flexural strength and fracture toughness of In-Ceram Zirconia.

Dental restorations made of zirconia are usually selectively adjusted chairside to eliminate occlusal or internal interferences that can impair the mechanical properties of ceramic framework material. Effects of polishing procedures on zirconia after chipping or simply glazing the monolithic zirconia restorations are not known. This study evaluated the effects of different surface treatment procedures--namely, glazing or grinding, finishing, and polishing regimens--on the flexural strength and fracture toughness of a zirconia core material.

Masticatory performance and mandibular movement patterns of patients with natural dentitions, complete dentures, and implant-supported overdentures.

The aim of this study was to compare quantitatively the masticatory performance of patients with overdentures supported by two implants, conventional complete dentures, and natural dentitions. Each patient was asked to chew a gelatin cube. The collected remains of the test food (gelatine cube) were fractioned by a sieving procedure and weighed.

An alternative method of fabricating a custom tray for direct implant impressions.

Creating accurate impressions for implants is essential for fabricating passive-fitting prostheses. This report describes a modified technique for fabricating a custom impression tray when implants are positioned unfavorably. A simple and accurate method of making an implant impression tray and the benefits of this technique are highlighted in this technical report.

Comparison of alternative adhesive cementation concepts for zirconia ceramic: glaze layer vs zirconia primer.

Purpose: Zirconia-based ceramics offer strong restorations in dentistry, but the adhesive bond strength of resin cements to such ceramics is not optimal. This study evaluated the bond strength of silane/adhesive/resin cement and zirconia primer/resin cement combinations on non-glazed and glazed zirconia surfaces before and after aging.

Materials And Methods: Disk-shaped zirconia ceramic specimens (diameter: 8 mm; thickness: 2 mm) (N = 80, n = 10 per group) were randomly divided into 2 groups.

Bonded orthodontic retainer and fixed partial denture made with fiber reinforced composite resin.

Retention is the phase of orthodontic treatment which maintains teeth in their orthodontically corrected positions, following the cessation of active orthodontic tooth movement. Development of resin-impregnated, fiber-reinforced composite materials has provided the potential to develop new approaches for stabilizing teeth and replacing teeth conservatively. This case report describes the rehabilitation of a patient with orthodontic and prosthetic problems.

Early bond strength of two resin cements to Y-TZP ceramic using MPS or MPS/4-META silanes.

For cementation of yttrium-stabilized tetragonal zirconium polycrystal (Y-TZP) ceramic frameworks, protocols of surface-conditioning methods and available cements vary, resulting in confusion among clinicians regarding selection and effects of different conditioning methods on cement adhesion. This study evaluated the effect of two silanes (3-trimethoxysilylpropylmethacrylate (MPS) and 3-trimethoxysilylpropylmethacrylate/4-methacryloyloxyethyl trimellitate anhydride methyl methacrylate (MPS/4-META) on the adhesion of two resin-based cements (SuperBond and Panavia F 2.0) to Y-TZP ceramic and compared several protocols with those indicated by the manufacturer of each of these cements.

Effect of aging conditions on the repair bond strength of a microhybrid and a nanohybrid resin composite.

Purpose: this study evaluated the effect of different aging methods on the repair bond strength and failure types of a microhybrid and a nanohybrid composite.

Materials And Methods: disk-shaped microhybrid (Quadrant Anterior Shine-QA) and nanohybrid (Tetric EvoCeram-TE) resin composite specimens (N = 192, n = 12/per group) were photopolymerized and randomly assigned to one of the three aging conditions: (1) immersion in deionized water (37°C, 2 months), (2) thermocycling (5000 times, 5 to 55 °C), (3) immersion in citric acid (pH: 3.0; 1 week).

Fabrication of a sectional impression tray and sectional complete denture for a patient with microstomia and trismus: a clinical report.

This article describes techniques used to fabricate mandibular and maxillary sectional trays and a folding maxillary complete denture for a patient with limited oral opening caused by scleroderma. For the foldable denture, the anterior teeth had to be arranged on a second base and the hinge fitted at a location higher than the denture base. These 2 factors increased the thickness of the denture and limited the volume of the tongue.

Effect of different bonding agents on shear bond strengths of composite-bonded porcelain to enamel.

Statement Of Problem: The use of bonding agents in the luting procedure for porcelain laminate restorations to enamel is not clear.

Purpose: This study evaluated the shear bond strength differences between an enamel-luting composite and a heat-pressed ceramic with 6 different bonding systems.

Material And Methods: Seventy standardized heat-pressed IPS Empress ceramic discs (4-mm diameter, 3-mm height) were prepared.

Alternative method for connecting a removable gingival extension and fixed partial denture: a clinical report.

In terms of esthetics and hygiene, defects in the alveolar ridge can complicate the design and fabrication of fixed partial dentures. When missing anterior teeth are restored, it may be difficult to achieve a satisfactory appearance without the correction of soft tissue and alveolar defects. When surgical intervention is not an option, a removable gingival extension and fixed prosthesis may be considered.

Prosthetic rehabilitation of extremely worn dentitions: case reports.

The stomatognathic system is a complicated structure, and patients usually adapt to their existing vertical dimension of occlusion. Therefore, prosthetic rehabilitation of decreased vertical dimension of occlusion should be considered only when dictated by esthetic or functional requirements. If the loss of vertical dimension is significant, provisional prostheses should be used before the final prosthesis to prevent tension or pain in the temporomandibular joints and the muscles as the patient adapts to the new dimensions.