Institute of Legal Medicine, Brazil
Title: Comparison of gunshot entrance morphologies caused by .40-caliber Smith & Wesson, .380-caliber, and 9-mm Luger bullets: A finite element analysis study
Rodrigo Ivo Matoso has completed his MSc at the age of 35 years from State University of Campinas, São Paulo, Brazil (FOP-UNICAMP). He is the President of the Regional Council of Dentistry of Roraima State, Brazil. He is Forensic Odontologist serving at the Civil Police of Roraima State since August 2004. He was lieutenant in Brazilian Army from 2002 to 2003. Nowadays, he is a Doctoral student at State University of Campinas, Piracicaba Dental School.
Firearms can cause fatal wounds, which can be identified by traces on or around the body. However, there are cases where neither the bullet nor gun is found at the crime scene. Ballistic research involving finite element models can reproduce computational biomechanical conditions, without compromising bioethics, as they involve no direct tests on animals or humans. This study aims to compare the morphologies of gunshot entrance holes caused by .40-caliber Smith & Wesson (S&W), .380-caliber, and 9×19-mm Luger bullets. A fully metal-jacketed .40 S&W projectile, a fully metal-jacketed .380 projectile, and a fully metal-jacketed 9×19-mm Luger projectile were computationally fired at the glabellar region of the finite element model from a distance of 10 cm, at perpendicular incidence. The results show different morphologies in the entrance holes produced by the three bullets, using the same skull at the same shot distance. The results and traits of the entrance holes are discussed. Finite element models allow feasible computational ballistic research, which may be useful to forensic experts when comparing and analyzing data related to gunshot wounds in the forehead.