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Influência do escoamento estático (CREEP) na dureza do amálgama. Efeito de ligas e regióes de medida.
(1990-05-01)
The authors studied the CREEP of 5 amalgam alloys (1 conventional and 4 with high cooper) by the application os static load of 36 MPa in 478 mm specimens, 7 days old. After CREEP test, the samples were included in acrylic ...
Effects of thermocycling on mechanical properties of soft lining materials.
(2009-12-01)
Soft linings are materials used to reduce the tension and forces of mastication, forming all or part of the fitting surface of a denture. This study evaluated the effect of thermocycling on water absorption, solubility, ...
Characteristics of the double-torsion test to determine the R-curve of ceramic materials
(2006-10-01)
Double-torsion tests were carried out on a commercial ceramic floor tile to verify whether this test is suitable for determining the R-curve of ceramics. The instantaneous crack length was obtained by means of compliance ...
Evaluation of the thermoplasticity of different gutta-percha cones and Resilon®
(2007-04-01)
The goal of this study was to evaluate the thermoplasticity of conventional and thermoplastic gutta-percha and Resilon®, a polyester polymer-based material. Specimens with standardised dimensions were made from the following ...
Periapical repair after root canal filling with different root canal sealers
(2009-12-01)
The aim of this study was to evaluate periapical repair after root canal filling with different endodontic sealers. Sixty four root canals from dog ́s teeth were filled, divided into 4 groups (n=16). Root canals were ...
Can the standard impact tests become a true materials evaluation tool?
(Budapest University of Technology and Economics, 2016-02)
Impact resistance constitutes one of the most popular quality control tools for polymeric materials and plastic finished parts. There are a number of standard impact test methods devoted to evaluate the impact response of ...
Effect of accelerated aging on the microhardness and color stability of flexible resins for dentures
(2010-01-01)
Acrylic resins have been widely used due to their acceptable esthetics and desirable characteristics such as easy handling, good thermal conductivity, low permeability to oral fluids and color stability. Flexible resins ...
The effect of endodontic materials on the optical density of dyes used in marginal leakage studies
(2008-01-01)
The aim of this study was to determine the effect of the exposure of different endodontic materials to different dye solutions by evaluating the optical density of the dye solutions. Seventy-five plastic tubes were filled ...
Sealing ability of retrograde obturation materials containing calcium hydroxide or MTA
(2011-12-01)
Newly available materials for retrograde obturation should have their sealing properties evaluated. The goal of this study was to evaluate the sealing ability of Endo CPM sealer, an MTA-based endodontic cement. Single-rooted ...
Effect of disinfectant agents on dimensional stability of elastomeric impression materials.
(1999-05-01)
STATEMENT OF PROBLEM: Difficulties in sterilizing impressions by traditional methods have led to chemical disinfection as an alternative, and some studies have shown that disinfectants may adversely affect impressions. ...