Analysis of the surface roughness and microhardness of dental restorative materials exposed to heat sources and cold temperatures for human identification purposes
| Autor: | Ricardo Henrique Alves da Silva, Roberto Cesar Biancalana, Fernanda de Carvalho Panzeri Pires-de-Souza, Sergio Augusto de Freitas Vincenti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Health (social science)
Materials science Dental materials Composite number Glass ionomer cement ANTROPOLOGIA FORENSE engineering.material 01 natural sciences Indentation hardness Pathology and Forensic Medicine 03 medical and health sciences 0302 clinical medicine Heat source Surface roughness stomatognathic system lcsh:Law in general. Comparative and uniform law. Jurisprudence 030216 legal & forensic medicine lcsh:R5-920 010401 analytical chemistry Metallurgy Cold temperature Cold wave 0104 chemical sciences Amalgam (dentistry) lcsh:K1-7720 engineering Knoop hardness test Forensic sciences Profilometer lcsh:Medicine (General) Law Forensic odontology |
| Zdroj: | Egyptian Journal of Forensic Sciences, Vol 9, Iss 1, Pp 1-9 (2019) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 2090-5939 |
| DOI: | 10.1186/s41935-019-0114-x |
| Popis: | Background Fatal accidents involving the action of heat, such as burns, explosions, automobile accidents, and aircraft crashes, among others, or action of cold, such as collisions in snowy locations, severe blizzards, cold waves, earthquakes, and avalanches, are frequent day-to-day occurrences. During post-mortem dental examination of victims, restorative materials such as the composite resin (CR), glass ionomer cement (GIC), and amalgam may be found. The action of the heat or cold on these materials may change their properties. This study aimed to evaluate the changes occurred in the surface roughness and Knoop microhardness of the dental restorative materials of freezing or burnt victims, supporting an adequate comparison with the antemortem data, helping on human identification process. Methods One hundred eighty caries-free bovine teeth were prepared and separated into groups, according to the restorative material, temperature, and period for analysis. The surface roughness and microhardness were analyzed by a profilometer and a microhardness tester, before and after the action of the heat (100 °C, 200 °C, 300 °C) and the cold temperatures (2.5 °C, − 20 °C, − 80 °C). Results The results demonstrated that there was no alteration on properties of CR after the heat that caused significant changes in the surface roughness of GIC and amalgam and the microhardness of GIC. The low temperatures produced no significant differences in any of the properties of the restorative materials studied. Conclusion The surface roughness and Knoop microhardness tests could distinguish the tooth-colored restorative materials irrespective of the action of the heat or cold temperatures. |
| Databáze: | OpenAIRE |
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