Effects of attachment design on strains around implants supporting overdentures.

The objective of this study was to compare strain magnitudes around implants supporting ball-retained, bar-retained, and distal cantilevered bar-retained mandibular overdentures subjected to vertical and oblique loads. Twelve edentulous mandibular acrylic resin casts with 2 implants in the parasymphyseal region were randomly divided into 3 groups (n = 4). Ball-retained, bar-retained, and distal cantilevered (8 mm) bar-retained overdentures were fabricated.

Microleakage study of 3 porcelain repair materials by autoradiography.

Objective: The purpose of this investigation was to test the microleakage of 3 porcelain repair systems intended for intraoral resin-to-porcelain and resin-to-metal bonding by autoradiography.

Method And Materials: Sixty alloy and 60 porcelain disks (10-mm diameter and 2-mm thickness) were prepared. Manufacturer's directions were followed for surface treatment of specimens.

Effect of topical fluorides and citric acid on heat-pressed all-ceramic material.

The effects of citric acid and acidulated phosphate fluoride on the surface roughness of autoglazed and overglazed all-ceramic IPS Empress materials were analyzed. Atomic force microscopy was used to measure the roughness. Citric acid solution (2.