title: Effects of different torque levels on the implant-abutment interface in a conical internal connection.
abstract: The fit of the implant-abutment interface was assessed by the metallographic technique and by scanning electron microscopy (SEM), using solid abutment types at different torque levels. Forty Morse taper connections and forty solid abutments were used at different torque levels (repeated after 10 minutes) in the following groups (n = 10): 25 Ncm (group g1), 30 Ncm (group g2), 35 Ncm (group g3), and 40 Ncm (group g4). The samples were embedded in a metallographic resin, sectioned lengthwise, and polished. SEM images were used to measure the linear contacts and the fits between abutments and the internal walls of the implant. The overall mean gap and standard deviation were as follows: 9.0 ± 1.36 µm for group g1, 7.9 ± 2.81 µm for group g2, 2.0 ± 0.76 µm for group g3, and 0.3 ± 0.40 µm for group g4. A significant difference was observed in the average fit values between the groups (p < 0.05). The linear area of contact between the abutment and the implant increased as torque augmented. This study demonstrated that higher insertion torque values in a conical internal connection increase the fit (contact) of the implant-abutment interface.
authors.affiliation: Department of Biotechnology, Universidad Católica San Antonio de Murcia, Murcia, Spain.
authors.forename: Sergio Alexandre
authors.initials: SA
authors.lastname: Gehrke
authors.affiliation: Department of Periodontology and Oral Implantology, Universidade de Guarulhos, Guarulhos, SP, Brazil.
authors.forename: Jamil Awad
authors.initials: JA
authors.lastname: Shibli
authors.affiliation: Department of Biotechnology, Universidad Católica San Antonio de Murcia, Murcia, Spain.
authors.forename: Jaime Sardá
authors.initials: JS
authors.lastname: Aramburú Junior
authors.affiliation: Universidad Católica San Antonio de Murcia, Murcia, Spain.
authors.forename: José Eduardo Maté Sánchez
authors.initials: JE
authors.lastname: de Val
authors.affiliation: Universidad Católica San Antonio de Murcia, Murcia, Spain.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Calvo-Girardo
authors.affiliation: Department of Materials Engineering, School of Dentitry, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Berenice Anina
authors.initials: BA
authors.lastname: Dedavid
mesh_terms: D000704:Analysis of Variance; D001863:Bone Screws; D000044:Dental Abutments / Q000592:standards*; D059605:Dental Implant-Abutment Design / Q000379:methods*; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants / Q000592:standards*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012015:Reference Standards; D019415:Torque; D016474:Weight-Bearing
chemical_list: D015921:Dental Implants