title: Comparison of external and internal hex implants' rotational freedom: a pilot study.
authors.affiliation: Department of Implant Dentistry, HRAC/Bauru Dental School, University of São Paulo, Brazil. gpbc@uol.com.br
authors.forename: Guilherme Paes
authors.initials: GP
authors.lastname: de Barros Carrilho
authors.forename: Roberta Pires
authors.initials: RP
authors.lastname: Dias
authors.forename: Carlos Nelson
authors.initials: CN
authors.lastname: Elias
mesh_terms: D001696:Biomechanical Phenomena; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D006801:Humans; D008422:Materials Testing; D012399:Rotation