Purpose: To determine whether two-step cementation of prefabricated fiber posts leads to higher bond strengths.
Materials And Methods: Forty-eight human canine teeth were divided into six groups and fiber posts were cemented with DC Core, RelyX Unicem and Panavia F2.0, according to a one-step or two-step procedure. Per root, four cross-sections were prepared. The differences in push-out strength between procedure, cement and location within the root were determined.
Results: For all cements, the push-out strengths for the two-step procedure were significantly higher than for the one-step procedure (p < 0.001). Differences between the cements for both the one-step and two-step procedure were not statistically significant (p = 0.05).
Conclusion: The reduction of the C-factor by means of a two-step cementation, a procedure equivalent to the layering technique of composite restorations, resulted in significantly higher bond strengths. The increase of 60% in bond strength may be beneficial to the retention of post and core restorations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3290/j.jad.a17534 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of Size-Controlled Nanofluid on Mechanical Properties, Microstructure, and Rheological Behavior of Cement Slurry for Oil Well Cementing.
ACS Omega
December 2024
Department of Petroleum Engineering and Geoengineering, Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, Uttar Pradesh 229304, India.
The optimal design of cement slurry by balancing various cement additives and cement is critical for effective oil well cementation job. However, given adverse circumstances of application, existing additives may not be sufficient to perform suitably in challenging conditions, leading to premature cement hydration, formation of microcracks, and gas channeling pathways. Thus, this study explores the use of a single-step silica nanofluid (NP size: 5-10, 90-100, and 250-300 nm and concentration: 1, 3, and 5 wt %) as an additive and explores its effect on thickening time, fluid loss, and rheological behavior of class G cement slurry at high-pressure and high-temperature (HPHT) conditions (135 °C and 3625 psi).
View Article and Find Full Text PDFStudy on the Oxidation Behavior of TiB-CeO-Modified (Nb,Mo,Cr,W)Si Coating on the Surface of Niobium Alloy.
Materials (Basel)
October 2024
School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Article Synopsis
- A TiB-CeO-modified (Nb,Mo,Cr,W)Si coating was developed for niobium alloys to enhance performance at high temperatures, addressing shortcomings of traditional NbSi coatings.
- At 1700 °C, this new coating exhibited over 20 hours of oxidation resistance thanks to a protective TiO-SiO-CrO composite oxide film that minimized oxygen penetration.
- The coating also demonstrated exceptional thermal shock resistance, surviving more than 1600 thermal cycles due to the formation of silicides, which improved fracture toughness and managed thermal stress effectively.
Bonding and Cleaning Effects of Irrigation Protocols Using Calcium Hypochlorite on the Post-space Radicular Dentin.
Oper Dent
November 2024
Milton Carlos Kuga, DDS, MSc, PhD, Department of Restorative Dentistry, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil.
This study evaluated the effect of 2.5% sodium hypochlorite (SH) or calcium hypochlorite (CH) submitted to passive ultrasonic irrigation (PUI) or conventional irrigation (CI) on the incidence of residues and the bond strength of the cementation system to post-space dentin. Distilled water (DW) and 2.
View Article and Find Full Text PDFEffect of propolis added to single-bottle adhesives on water permeation through the hybrid layer.
Eur J Oral Sci
December 2024
Faculty of Dentistry, Federal University of Alagoas, Maceió, Brazil.
Water treeing and water droplets are observed within adhesive layers and on the hybridized surface after bonding sound dentin using single-bottle etch-and-rinse adhesives, indicating permeability of the hybrid layer to water. The aim of this study was to assess the efficacy of dentin sealing by adhesives containing propolis by quantifying the area of water transudation from dentinal tubules after dentin hybridization. Brazilian red propolis was added to experimental adhesive and Single Bond (3M/ESPE) adhesive; experimental adhesive and Single Bond without propolis were used as controls.
View Article and Find Full Text PDFSimulation Study on Residual Stress Distribution of Machined Surface Layer in Two-Step Cutting of Titanium Alloy.
Materials (Basel)
August 2024
Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, China.
Ti-6Al-4V titanium alloy is known as one of the most difficult metallic materials to machine, and the machined surface residual stress distribution significantly affects properties such as static strength, fatigue strength, corrosion resistance, etc. This study utilized finite element software Abaqus 2020 to simulate the two-step cutting process of titanium alloy, incorporating stages of cooling, unloading, and de-constraining of the workpiece. The chip morphology and cutting force obtained from orthogonal cutting tests were used to validate the finite element model.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!