For preparation of the photoelastic model II, three implants were positioned in the second laboratory model. Two of these were inserted parallel to each other in the region of incisor and canine using a parallelometer and the other in the region of the first molar was tilted 17 deg to the distal. To determine this inclination in the plaster model, a straight line was drawn with a slope of 17 deg to the distal region, with the assistance of a retro projector marker (Pilot Pen Brasil, São Paulo, Brasil), transparent adhesive paper (Plastific Comércio Plastificação Ltda, Belo Horizonte, Minas Gerais, Brasil), protractor, and ruler. In the vestibular region of the plaster model, this adhesive paper was glued in order to adequately guide the drilling of the plaster model in this region. After perforation, the implants analogues with and 4.1 mm platforms (Neodent, Curitiba, Paraná, Brasil) were inserted and fixed with Duralay acrylic resin (Duralay Reliance Dental MFG Co, Worth, Illinois), so that the analogue platform remains at the same level of the alveolar ridge.