title: Marginal fit and microgaps of implant-abutment interface with internal anti-rotation configuration.
abstract: To date, there is no evidence that internal anti-rotation configurations are better than external ones. As part of a study to clarify the features and advantages of internal anti-rotation configurations, the objective of the present investigation was to compare and evaluate the marginal fit and size of microgap at the implant-abutment interface for several external and internal anti-rotation configurations. To this end, three internal connection and two external hex connection implant-abutment assemblies were examined in this study. The implant-abutment interface (I-A interface) was evaluated using three geometrical factors: vertical and horizontal discrepancies and size of microgap. Marginal fit and microgap size were measured by a scanning laser microscope. The I-A interface was also observed using a scanning electron microscope. Mean vertical discrepancy ranged from 22.6 to 62.2 microm, while horizontal discrepancy ranged from -27.1 to 16.0 microm. The microgap values of all I-A interfaces assessed in this study ranged from 2.3 to 5.6 microm. In conclusion, SEM images of I-A interface suggested no relationship between the geometrical factors and the type of anti-rotation configuration.
authors.affiliation: Nihon University Graduate School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
authors.forename: Takuma
authors.initials: T
authors.lastname: Tsuge
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Hagiwara
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D000044:Dental Abutments; D015921:Dental Implants; D017267:Dental Prosthesis Design; D006801:Humans; D008422:Materials Testing; D018613:Microscopy, Confocal; D008855:Microscopy, Electron, Scanning; D012399:Rotation; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants