title: Comparison of compressive strength between three different plates for mandibular angle fractures fixation.
abstract: The present study aims to compare three types of internal fixation for fractures of the mandibular angle. Mechanical testing was performed on replicas of polyurethane hemimandibles sectioned at the angle region to simulate a fracture and fixed with three different hardwares. Fixation devices enrolled on this survey included the grid plates with and without an intermediate bar and the method described by Champy and colleagues in 1978 and the sample consisted of 10 hemimandibles for each group. Vertical loadings were applied on each hemimandible and recorded after a vertical displacement of 3 and 5 mm. Statistical analysis was made by means of the variance analysis (ANOVA) and the Duncan test with a significance level of 5%. The Champy technique showed a statistically significant increased resistance when compared to the grid plates after vertical displacements of 3 and 5 mm. The results of this survey suggest that the Champy technique, when compared to the grid plate positioned at the middle of the mandibular bone (placement site selected for this study), is more resistant than the grid plate and that the inclusion or not of an intermediate bar to the grid plates does not improve its resistance after linear vertical loadings.
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil.
authors.forename: Mariana C
authors.initials: MC
authors.lastname: Negreiros Lyrio
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil. Electronic address: monnazzi@ig.com.br.
authors.forename: Marcelo Silva
authors.initials: MS
authors.lastname: Monnazzi
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil.
authors.forename: Marcio
authors.initials: M
authors.lastname: De Moraes
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Hochuli-Vieira
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil.
authors.forename: José Mauricio
authors.initials: JM
authors.lastname: Nunes Reis
authors.affiliation: Dental School of Araraquara, Department of Diagnosis and Oral and Maxillofacial Surgery, Universidade Estadual Paulista, Unesp, Rua Humaita, 1680, 2° andar, Araraquara, São Paulo Cep 14801-903, Brazil.
authors.forename: Valfrido Antonio
authors.initials: VA
authors.lastname: Pereira-Filho
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D001696:Biomechanical Phenomena; D001732:Bite Force; D001860:Bone Plates; D001863:Bone Screws; D019245:Compressive Strength; D004867:Equipment Design; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D008337:Mandibular Fractures / Q000145:classification / Q000601:surgery*; D008953:Models, Anatomic; D011140:Polyurethanes / Q000737:chemistry; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D011140:Polyurethanes; D014025:Titanium
keywords: Bite force; Bone plate; Compressive strength; Mandibular fracture