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.  Background:  Dental materials, including dental amalgam, undergo macro-structural changes when exposed to high temperatures. Understanding those changes can be useful for dental identification and documentation when conducting medical-legal autopsies of burned, charred, or incinerated bodies to determine type of biomaterial and highest temperature reached.  Purpose:  Describe the formation of silver nodules on the surface of dental amalgams exposed to high temperatures, in order to identify patterns and reliable markers for forensic dentistry use.  Methods:  This was a quasi-experimental  in vitro  study that described the formation of silver nodules in a sample of 45 dental amalgam discs (brands: Contour® Kerr®, Admix® SDI®, and Nu Alloy® New Stetic®) and 45 occlusal fillings in premolars that were exposed to high temperatures (200o C, 400o C, 600o C, and 800o C).  Results:  Silver nodules were evident on the amalgam surfaces between 200o C and 400o C and began to disappear at 600o C to form spheres and strips upon reaching 800o C.  Conclusions:  The formation and disappearance of silver nodules is a recurring feature of new-generation amalgam alloys exposed to extreme temperatures. Therefore, describing them can be used as a marker to identify materials and determine highest temperature reached by human remains.

universitas odontológica

Cambios macroscópicos de la amalgama dental sometida in vitro a altas temperaturas con fines forenses: el caso de los nódulos de plata / Macroscopic Changes of Dental Amalgam subjected in vitro at High Temperatures with Forensic Purposes: Silver Bullets