title: Effect of mechanical cycling on screw torque in external hexagon implants with and without platform switching.
abstract: This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 106 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (p<0.05). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (p<0.05) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.
authors.affiliation: Department of Oral Implantology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, SP, Brasil.
authors.forename: Bruno Andrade Cantharino
authors.initials: BA
authors.lastname: de Carvalho
authors.affiliation: Department of Oral Implantology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, SP, Brasil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Vedovatto
authors.affiliation: Department of Oral Implantology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, SP, Brasil.
authors.forename: Paulo Sérgio Perri
authors.initials: PS
authors.lastname: de Carvalho
authors.affiliation: Department of Oral Implantology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, SP, Brasil.
authors.forename: José Vitor Quinelli
authors.initials: JV
authors.lastname: Mazaro
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, Universidade Estadual Paulista, Araçatuba, SP, Brasil.
authors.forename: Rosse Mary
authors.initials: RM
authors.lastname: Falcón-Antenucci
mesh_terms: D001863:Bone Screws; D015921:Dental Implants; D011474:Prosthesis Design; D019415:Torque
chemical_list: D015921:Dental Implants