scholarly journals The effects of acid etching time on surface mechanical properties of dental hard tissues

2015 ◽  
Vol 34 (3) ◽  
pp. 315-320 ◽  
Author(s):  
Muhammad Sohail ZAFAR ◽  
Naseer AHMED
Keyword(s):  
Mechanical Properties ◽  
Acid Etching ◽  
Etching Time ◽  
Dental Hard Tissues ◽  
Hard Tissues

Nanoindentation: Application to dental hard tissue investigations

2006 ◽  
Vol 21 (8) ◽  
pp. 1893-1905 ◽  
Author(s):  
L. Angker ◽  
M.V. Swain
Keyword(s):  
Mechanical Properties ◽  
Elastic Recovery ◽  
Pathological Conditions ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Calcified Tissue ◽  
Biological Composites ◽  
Calcified Tissues ◽  
Mineral Levels ◽  
Indenter Penetration

In the last decade, most publications on the mechanical properties of dental calcified tissues were based on nanoindentation investigation. This technique has allowed a better understanding of the mechanical behavior of enamel, dentin, and cementum at a nanoscale. The indentations are normally carried out using pointed or spherical indenters. Hardness and elastic modulus are measured as a function of indenter penetration depth and from the elastic recovery upon unloading. The unique microstructure of each calcified tissue significantly contributes to the variations in the mechanical properties measured. As complex hydrated biological composites, the relative proportions of the composite components, namely, inorganic material (hydroxyapatite), organic material, and water, determines the mechanical properties of the dental hard tissues. Many pathological conditions affecting dental hard tissues cause changes in mineral levels, crystalline structures, and mechanical properties that may be probed by nanoindentation. This review focuses on relevant nanoindentation techniques and their applications to enamel, dentin, and cementum investigations.

611 Identification of Mechanical Properties of Human Dental Hard Tissues Based on Micro-Indentation

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _6-14_
Author(s):  
Kensuke KOKUMAI ◽  
Tetsusei KURASHIKI ◽  
Hiroaki NAKAI ◽  
Masaru ZAKO
Keyword(s):  
Mechanical Properties ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Micro Indentation

Variation in the Changes Induced by Different Forms of Tobacco in Dental Hard Tissues-A SEM-EDAX Study

2011 ◽  
Vol 53 (4) ◽  
pp. 348-355
Author(s):  
Thakare Eesha ◽  
Chaudhary Minal ◽  
Gawande Madhuri ◽  
Wadhwan Vijay ◽  
Gadbail Amol
Keyword(s):  
Dental Hard Tissues ◽  
Hard Tissues

Primary Teeth and Hair as Indicators of Environmental Pollution

2016 ◽  
Vol 40 (2) ◽  
pp. 152-155 ◽  
Author(s):  
TE Shishniashvili ◽  
NN Suladze ◽  
VV Margvelashvili
Keyword(s):  
Environmental Pollution ◽  
Toxic Elements ◽  
Chemical Elements ◽  
Epidemiological Survey ◽  
Essential Elements ◽  
World Health ◽  
Dental Tissues ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Health Organization

Objectives: To study the influence of environmental pollution on the mineralization of dental hard tissues by using biosubstrates: teeth and hair. :Study design: At the first stage epidemiological survey was conducted in polluted and less polluted areas of Tbilisi (Georgia). We studied 525 children aged 3 and 4 years. Caries prevalence and intensity was defined by the methodology of World Health Organization. At the second stage the chemical elements content was studied in hair and teeth hard tissues of 24 children by X - ray fluorescent spectroscopy method. Results: The prevalence of dental caries in the polluted region was 46%, caries intensity − 1.92 (± 2.842). In the less polluted region prevalence was 37%, caries intensity − 1.47 (± 2.571). These data are statistically reliable (p < 0.05). The study of hair and tooth tissues showed that the toxic elements (Pb, Hg, Sn, Ti) content in these tissues was higher in environmentally unfavorable than in favorable conditions. Conclusion: Hair and dental tissues can be used as indicators of environmental pollution. Our survey showed that toxic elements content in dental hard tissues was higher and the level of essential elements was less in polluted than in less polluted areas of Tbilisi.

scholarly journals Acid Etching as Surface Treatment Method for Luting of Glass-Ceramic Restorations, part 1: Acids, Application Protocol and Etching Effectiveness

2018 ◽  
Vol 6 (3) ◽  
pp. 568-573 ◽  
Author(s):  
Emilija Barjaktarova-Valjakova ◽  
Anita Grozdanov ◽  
Ljuben Guguvcevski ◽  
Vesna Korunoska-Stevkovska ◽  
Biljana Kapusevska ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Glass Ceramic ◽  
Hydrofluoric Acid ◽  
Treatment Method ◽  
Acid Etching ◽  
Etching Time ◽  
Ceramic Surface ◽  
Adhesive Luting ◽  
Ceramic Restorations ◽  
Etching Effect

AIM: The purpose of this review is to represent acids that can be used as surface etchant before adhesive luting of ceramic restorations, placement of orthodontic brackets or repair of chipped porcelain restorations. Chemical reactions, application protocol, and etching effect are presented as well.STUDY SELECTION: Available scientific articles published in PubMed and Scopus literature databases, scientific reports and manufacturers' instructions and product information from internet websites, written in English, using following search terms: “acid etching, ceramic surface treatment, hydrofluoric acid, acidulated phosphate fluoride, ammonium hydrogen bifluoride”, have been reviewed.RESULTS: There are several acids with fluoride ion in their composition that can be used as ceramic surface etchants. The etching effect depends on the acid type and its concentration, etching time, as well as ceramic type. The most effective etching pattern is achieved when using hydrofluoric acid; the numerous micropores and channels of different sizes, honeycomb-like appearance, extruded crystals or scattered irregular ceramic particles, depending on the ceramic type, have been detected on the etched surfaces.CONCLUSION: Acid etching of the bonding surface of glass - ceramic restorations is considered as the most effective treatment method that provides a reliable bond with composite cement. Selective removing of the glassy matrix of silicate ceramics results in a micromorphological three-dimensional porous surface that allows micromechanical interlocking of the luting composite.

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