title: Influence of Two Types of Connections in Driver-Retention Screw Assembly.
abstract: Rehabilitation with implant-supported prostheses has reached high success rates. However, mechanical failures are still reported, mainly in retention screws of abutments in single implant-supported crowns; which is designed to be the weakest structure and the first component to fail under overloading. In this sense, the aim of this in vitro study was to evaluate the influence of different joint designs (square or hexagonal) on resistance to deformation of driver-retention screw assembly of 3 commercial brands (Neodent, Singular, and Sin). A total of 42 retention screws from 3 commercial brands were used. The samples were divided into 2 joint groups, square (SQU) and hexagonal (HEX), and separated by commercial brands. Several components (implants and abutments) with standard platform (4.1 mm in diameter) were used. The resistance to deformation of the driver-retention screw assembly was measured using an accurate digital torque wrench for all commercial brands (Neodent [NEO], Singular [SGL], and Sin [SIN]) and joint designs (square or hexagonal). It was found no statistically significant difference (P <0.05) among the brands evaluated. On the other hand, square screws showed higher resistance to torsion than hexagonal screws; regardless the commercial brand.
authors.affiliation: *Health School, Potiguar University-Laureate International Universitiess †Departament of Dentistry, Federal University of Rio Grande do Norte ‡Privacy Practice, Natal §Departament of Dentistry, Federal University of Rio Grande do Norte, Natal, Brazil.
authors.forename: Magnus Sérgio Martins de
authors.initials: MS
authors.lastname: Paiva
authors.forename: Samila Neres de
authors.initials: SN
authors.lastname: Oliveira
authors.forename: Jéssyca Viviane Andrade
authors.initials: JV
authors.lastname: Dias
authors.forename: Cypriano Galvão da Trindade
authors.initials: CG
authors.lastname: Neto
authors.forename: José Renato Cavalcante de
authors.initials: JR
authors.lastname: Queiroz
authors.forename: Erika Almeida de
authors.initials: EA
authors.lastname: Oliveira
authors.forename: Amílcar Chagas Freitas
authors.initials: AC
authors.lastname: Júnior
mesh_terms: D003442:Crowns; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D006801:Humans; D011474:Prosthesis Design; D011475:Prosthesis Failure; D019415:Torque