Electrochemical impedance spectroscopy study of corrosion characteristics of palladium-silver dental alloys.

Electrochemical impedance spectroscopy (EIS) has been used to obtain insight into corrosion processes for three Pd-Ag alloys, and compare their behavior with an Au-Pd alloy. Five specimens of each alloy received clinically-appropriate simulated porcelain-firing heat treatment. EIS testing was performed at ambient temperature, using 0.

Potentiodynamic polarization study of the corrosion behavior of palladium-silver dental alloys.

Statement Of Problem: Although palladium-silver alloys have been marketed for over 3 decades for metal-ceramic restorations, understanding of the corrosion behavior of current alloys is incomplete; this understanding is critical for evaluating biocompatibility and clinical performance.

Purpose: The purpose of this in vitro study was to characterize the corrosion behavior of 3 representative Pd-Ag alloys in simulated body fluid and oral environments and to compare them with a high-noble Au-Pd alloy. The study obtained values of important electrochemical corrosion parameters, with clinical relevance, for the rational selection of casting alloys.

Evaluation of patient experience and satisfaction with CAD-CAM-fabricated complete dentures: A retrospective survey study.

Statement Of Problem: Reports of sound, evidence-based treatment outcomes of computer-aided design and computer-aided manufacture (CAD-CAM) of complete dentures (CD) are lacking in publication databases.

Purpose: The purpose of this retrospective survey study was to assess patient preferences and satisfaction when treated with digitally fabricated CDs, by using a questionnaire.

Material And Methods: A total of 50 patients who received digital CDs were included in this study.

Clinical performance of CAD-CAM-fabricated complete dentures: A cross-sectional study.

Statement Of Problem: Computer-aided design and computer-aided manufacture (CAD-CAM)-fabricated complete dentures (CD) seek to address the disadvantages associated with conventional CD fabrication. However, few if any randomized clinical trials, cross-sectional, and/or retrospective analyses are available for the clinical performance of CAD-CAM-fabricated CDs.

Purpose: The purpose of this retrospective study was to evaluate clinician experience with digital CD fabrication attempted in a 2-visit protocol.

Using a porcelain furnace to debond cement-retained implant crown from the abutment after screw fracture: a clinical report.

When a screw fracture occurs on a cement-retained, implant-supported restoration, the abutment and restoration are completely separated from the implant's internal connection. Traditionally, an access hole is drilled through the crown to retrieve the broken screw, and the restoration can be placed again as a screw-retained restoration. This clinical report documents a patient whose broken abutment screw was retrieved from the restoration by burning off the cement and separating from the abutment without drilling an access hole.

A technique for fabricating a hinged mandibular complete dental prosthesis with swing lock for a patient with microstomia.

Microstomia is defined as an acquired or congenital condition involving a reduction of the oral aperture severe enough to compromise esthetics, nutrition, and quality of life. This clinical report describes a technique for fabricating a mandibular swing-lock complete denture with a hinge for a patient with muscular dystrophy. A hinge in the midline allowed the denture to collapse.

Measure of microhardness, fracture toughness and flexural strength of N-vinylcaprolactam (NVC)-containing glass-ionomer dental cements.

Objectives: To investigate the effects of N-vinylcaprolactam (NVC)-containing terpolymers on the fracture toughness, microhardness, and flexural strength of conventional glass-ionomer cements (GIC).

Methods: The terpolymer of acrylic acid (AA)-itaconic acid (IA)-N-vinylcaprolactam (NVC) with 8:1:1 (AA:IA:NVC) molar ratio was synthesized by free radical polymerization and characterized using (1)H NMR and FTIR. Experimental GIC samples were made from a 50% solution of the synthesized terpolymer with Fuji IX powder in a 3.

Shear bond strength of orthodontic brackets bonded to provisional crown materials utilizing two different adhesives.

Objective: To test the hypothesis that there is no difference in the shear bond strength of brackets bonded to provisional crown materials (PCMs) using two adhesive agents.

Materials And Methods: Four PCMs were tested: Integrity, Jet, Protemp, and Snap. Forty cylindrical specimens of 10 mm diameter x 5 mm were prepared for each PCM.

Fatigue limits and SEM/TEM observations of fracture characteristics for three Pd-Ag dental casting alloys.

The fatigue limits and fracture characteristics for three Pd-Ag dental casting alloys (Super Star, Heraeus Kulzer; Rx 91, Pentron; W-1, Ivoclar Vivadent) were studied. Specimens meeting the dimensions for ADA Specifications No. 5 and 38, and having the as-cast surface condition, were subjected to heat treatment simulating dental porcelain firing cycles and fatigued in air at room temperature under uniaxial tension-compression at 10 Hz.

Early rehabilitation of facial defects using interim removable prostheses: report of two clinical cases.

Postsurgical facial defects often pose a challenge to patient rehabilitation. Such defects can have a severe adverse effect on patient perceptions of body image and self-esteem. When immediate surgical repair of the defect is not feasible, an interim removable facial prosthesis may be considered.

Delayed linear expansion of improved dental stone.

Statement Of Problems: Specification 25 of the American Dental Association (ADA) states that final setting expansion measurements of improved dental stone are made 2 hours after mixing. In a limited pilot study on selected type IV and V dental stones, measurements showed delayed linear expansion or early contraction continuing up to 120 hours.

Purpose: The objectives of this in vitro study were to measure the linear setting expansion of 6 ADA type IV and V dental stones, to compare their expansion at 2 hours relative to ADA Specification 25, and to characterize expansion changes up to 120 hours.

Dental follow-up compliance in a population of irradiated head and neck cancer patients.

Objective: This study assessed post-radiation therapy dental follow-up compliance in a population of head and neck cancer patients.

Study Design: A total of 334 dental charts were retrospectively reviewed to determine the follow-up status of dentate patients. All patients were informed of the importance of returning, after completing radiotherapy, for regular follow-up dental examinations on an indefinite basis.