Effect of phosphate group addition on the properties of denture base resins.

Statement Of Problem: Acrylic resins are prone to microbial adherence, especially by Candida albicans. Surface-charged resins alter the ionic interaction between the denture resin and Candida hyphae, and these resins are being developed as a means to reduce microbial colonization on the denture surface.

Purpose: The purpose of this study was to investigate the physical and mechanical properties of phosphate-containing polymethyl methacrylate resins for their suitability as a denture material.

Physical properties of denture base resins potentially resistant to Candida adhesion.

Purpose: The addition of anionic charge on denture base resins has been shown to inhibit Candida albicans adhesion and to facilitate adsorption of salivary defense molecules. The aim of this study was to evaluate the physical properties of a modified denture base resin for denture fabrication.

Materials And Methods: Specimens made from heat polymerizing resin Lucitone 199 were used as the control group.

A comparison of bond strength between direct- and indirect-bonding methods.

The purpose of this study was to evaluate and compare the shear bond strength and the sites of bond failure for brackets bonded to teeth, using two indirect-bonding material protocols and a direct-bonding technique. Sixty extracted human premolars were collected and randomly divided into three groups. The direct-bonded group (group 1) used a light-cured adhesive and primer (Transbond XT).

The effect of repeated torque and salivary contamination on the preload of slotted gold implant prosthetic screws.

Statement Of Problem: Screw loosening and/or fracture is common and has been attributed to many factors, including improper torque and preload. Purpose. This study evaluated the effect of repeated preload torque and salivary contamination on the preload of the slotted gold implant prosthetic screw.

The effect of repeated torque on the ultimate tensile strength of slotted gold prosthetic screws.

Statement Of Problem: Repeated torque may alter the mechanical properties and fracture resistance of certain prosthetic retaining screws.

Purpose: This study evaluated the effect of repeated torque and salivary contamination on the ultimate tensile strength of one type of slotted gold prosthetic retaining screw.

Material And Methods: Forty-five slotted gold prosthetic screws from the same manufacturer (Implant Innovations) were divided randomly into 9 groups of 5 screws each, with group 0X being an unused control.

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.

Defects in hexed gold prosthetic screws: A metallographic and tensile analysis.

Statement Of Problem: Prosthetic gold screw fracture remains a clinical problem in implant prosthodontics.

Purpose: This study examined hexed gold prosthetic screws for internal defects and determined the effect of these defects on tensile strength. The microstructure, microhardness, and major constituents of the alloys also were determined.