Pedro Henrique Corazza1, Alecsandro de Moura Silva, José Renato Cavalcanti Queiroz, Susana María Salazar Marocho, Marco Antonia Bottino, Marcos Massi, Rodrigo Othávio de Assunção e Souza. 1. *PhD Student, Department of Dental Materials and Prosthodontics, Institute for Science and Technology at São Jose dos Campos, São Paulo State University, São José dos Campos, Brazil. †Collaborating Professor, Department of Physics, Technologic Institute of Aeronautics, São José dos Campos, Brazil. ‡Postdoctoral Student, Department of Dental Materials and Prosthodontics, São Paulo University, São Paulo, Brazil. §Professor, Department of Dental Materials and Prosthodontics, Institute for Science and Technology at São Jose dos Campos, São Paulo State University, São José dos Campos, Brazil. ‖Adjunct Professor, Division of Prosthodontics, Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil.
Abstract
PURPOSE: To evaluate the effect of diamond-like carbon (DLC) coating of prefabricated implant abutment on screw removal torque (RT) before and after mechanical cycling (MC). MATERIALS AND METHODS: Fifty-four abutments for external-hex implants were divided among 6 groups (n = 9): S, straight abutment (control); SC, straight coated abutment; SCy, straight abutment and MC; SCCy, straight coated abutment and MC; ACy, angled abutment and MC; and ACCy, angled coated abutment and MC. The abutments were attached to the implants by a titanium screw. RT values were measured and registered. Data (in Newton centimeter) were analyzed with analysis of variance and Dunnet test (α = 0.05). RESULTS: RT values were significantly affected by MC (P = 0.001) and the interaction between DLC coating and MC (P = 0.038). SCy and ACy showed the lowest RT values, statistically different from the control. The abutment coated groups had no statistical difference compared with the control. Scanning electron microscopy analysis showed DLC film with a thickness of 3 μm uniformly coating the hexagonal abutment. CONCLUSION: DLC film deposited on the abutment can be used as an alternative procedure to reduce abutment screw loosening.
PURPOSE: To evaluate the effect of diamond-like carbon (DLC) coating of prefabricated implant abutment on screw removal torque (RT) before and after mechanical cycling (MC). MATERIALS AND METHODS: Fifty-four abutments for external-hex implants were divided among 6 groups (n = 9): S, straight abutment (control); SC, straight coated abutment; SCy, straight abutment and MC; SCCy, straight coated abutment and MC; ACy, angled abutment and MC; and ACCy, angled coated abutment and MC. The abutments were attached to the implants by a titanium screw. RT values were measured and registered. Data (in Newton centimeter) were analyzed with analysis of variance and Dunnet test (α = 0.05). RESULTS: RT values were significantly affected by MC (P = 0.001) and the interaction between DLC coating and MC (P = 0.038). SCy and ACy showed the lowest RT values, statistically different from the control. The abutment coated groups had no statistical difference compared with the control. Scanning electron microscopy analysis showed DLC film with a thickness of 3 μm uniformly coating the hexagonal abutment. CONCLUSION: DLC film deposited on the abutment can be used as an alternative procedure to reduce abutment screw loosening.
Authors: Alecsandro de Moura Silva; Viviane Maria Gonçalves de Figueiredo; Renata Falchete do Prado; Gabriela de Fátima Santanta-Melo; Milagros Del Valle El Abras Ankha; Luana Marotta Reis de Vasconcellos; Argemiro Soares da Silva Sobrinho; Alexandre Luiz Souto Borges; Lafayette Nogueira Junior Journal: J Oral Biol Craniofac Res Date: 2019-04-17