title: Stress distribution in bone simulation model with pre-angled implants.
abstract: The aim of this study was evaluate the biomechanical behaviour of prostheses screwed into conventional (0° angulation) and pre-angled experimental (8, 12 and 20°) external hexagon implants (13 × 4 mm) by photoelastic analysis. Eight casts were made in photoelastic resin. Casts were divided into groups of single crowns or three combined elements. Each unit was positioned in a circular polariscope. By using a universal testing machine, 100 N loads were applied in the axial and oblique (45°) directions to fixed points on the occlusal surfaces of the crowns. Generated stresses were recorded photographically and analysed qualitatively in a graphics program. In single-element prostheses, the number of high-stress fringes increased with increasing implant angle. However, in three-element prostheses, there was no difference in the stress distribution with implant angle, except for the 12° implant that had a higher degree of stress. For the other groups pre-angulation of the implant increases the concentration and intensity of stresses for single prosthesis and has similar stress distribution in three-element fixed prostheses.
authors.affiliation: Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP - Sao Paulo State University , Aracatuba, Sao Paulo , Brazil.
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.forename: Guilherme Sarauza
authors.initials: GS
authors.lastname: Arsufi
authors.forename: Rodrigo Antonio
authors.initials: RA
authors.lastname: de Medeiros
authors.forename: Aldiéris Alves
authors.initials: AA
authors.lastname: Pesqueira
authors.forename: Aimée Maria
authors.initials: AM
authors.lastname: Guiotti
authors.forename: Daniela Micheline
authors.initials: DM
authors.lastname: dos Santos
mesh_terms: D001842:Bone and Bones / Q000502:physiology; D015921:Dental Implants; D008954:Models, Biological; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants
keywords: Dental implants; dental prosthesis; implant-supported; photoelastic analysis