Journal of Forensic Dental Sciences
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ORIGINAL ARTICLE
Year : 2009  |  Volume : 1  |  Issue : 1  |  Page : 17-23

Effects of high temperatures on different dental restorative systems: Experimental study to aid identification processes


1 Oral and Maxillofacial Surgery Research Group (Dental Anthropology and Forensic Dentistry Research Line) of the Dentistry School, University of Valle, Colombia
2 Dental Materials Unit, Department of Odontostomatology, University of Pavia, Italy
3 Specialized Identification Laboratory, General Office of the Public Prosecutor of the Nation, Colombia

Correspondence Address:
Freddy Moreno
Universidad del Valle, Escuela de Odontología, Calle 4B No. 36-00 Edificio 132 Oficina 308, A. A. 25360, Cali
Colombia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-2948.50883

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This "in vitro" study was to observe the effects of high temperatures on teeth restored by (1) amalgam overlaying glass ionomer bases, (2) composite/adhesive system overlaying glass ionomer bases, (3) ZnO modified temporary filling material vs. unrestored teeth. Fifty un-restored teeth (control group), 50 teeth with class I amalgam restorations and glass ionomer bases, 50 teeth with class I composite/adhesive system restorations and glass ionomer bases and 50 teeth with class I ZnO modified temporary filling material restorations were placed in a furnace and heated at a rate of 10°C/min. The effects of the predetermined 200, 400, 600, 800, 1000 and 1200°C temperatures were examined macroscopically and then observed microscopically by means of a stereomicroscope. Our observations showed that the class I restorations made of amalgam on glass ionomer bases as far as the class I restorations made of ZnO modified temporary filling material can be identified till 1200°C because they maintain their shape despite the disintegration of the crowns, whilst the class I composite/adhesive system and the underplayed glass ionomer bases remained in place in an altered shape.


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