The Temperature Dependence of Micro-Leakage between Restorative and Pulp Capping Materials by Cu Diffusion.

Mumcu A,Kamalak H,Altin S

doi:10.2174/1874210601509010140

Abstract

We used the Cu ions for the leakage analysis between pulp capping and restorative materials. Theoretically, Cu has more advantages than Ag ions due to their smaller radii (rCu2+=73 pm and rAg2+=94 pm), lower mass density (dCu=8.96 g/cm3 and dAg=10.49 g/cm3) and higher radio opacity which can be more useful by X-ray or EDX detectors, cheaper price and more abundance in planet when compared with Ag element which is generally used in the leakage studies. The micro leakage between dental restorations and pulp capping materials has been determined by using Micro Computed Tomography, Scanning Electron Microscopy and EDX analysis. It is found that the leakage has temperature dependent mechanism which increases with the increasing temperature. As a result, using Cu solution for leakage studies in dentine is an effective and easy method which can be used in dental science.

Highlights

The leakage that is known as the diffusion of molecules, bacteria, fluids and ions from the cavity wall and the restorative material is one of the most important reasons for the failure and re-occurrence of restorations [1]
We investigated the diffusion mechanism in the interface region of the fabricated samples by cutting the sample in the middle after Cu diffusion for different temperature for 12 h
Cu concentration is higher in the region close to the surface of the material. It appears that some regions during the interface section have higher dot intensity which is an evidence of the leakage between the pulp capping material and the restorative materials

Summary

Introduction

The leakage that is known as the diffusion of molecules, bacteria, fluids and ions from the cavity wall and the restorative material is one of the most important reasons for the failure and re-occurrence of restorations [1]. The leakage mechanism is important for understanding the pain after dental treatment and developing of the new materials [4,5,6,7,8,9]. Navarra et al investigated the leakage ratio of different adhesive materials and they found that the leakage is strongly depend on the materials used during the dental treatment [13]. The other important factor for the leakage is the polymerization ratio of the materials and fast polymerization can cause a strong shrinkage and so the leakage may increase [10,11,12,13,14,15]. The technique is based on the radioopacity of the leaked materials and the most popular process is the using Ag ions for diffusion in dentine which can be detected by micro-CT. The radioopacity of matters such as elements and tissues depends on the atomic number i.e. higher atomic number results higher radioopacity [16,17,18,19,20,21]

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