Marginal Fit and Microgaps of Implant-abutment Interface with Internal Anti-rotation Configuration

• Published in: Dental Materials Journal Vol. 27; no. 1; pp. 29 - 34
• Main Authors: TSUGE, Takuma, HAGIWARA, Yoshiyuki, MATSUMURA, Hideo
• Format: Journal Article
• Language: English
• Published: Japan The Japanese Society for Dental Materials and Devices 2008
• Subjects: Dental Abutments; Dental Implants; Dental Prosthesis Design; Humans; Implant-abutment interface; Marginal fit; Materials Testing; Microgap; Microscopy, Confocal; Microscopy, Electron, Scanning; Rotation; Surface Properties; Torque
• ISSN: 0287-4547; 1881-1361
• DOI: 10.4012/dmj.27.29

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 μm, while horizontal discrepancy ranged from —27.1 to 16.0 μm. The microgap values of all I-A interfaces assessed in this study ranged from 2.3 to 5.6 μm. In conclusion, SEM images of I-A interface suggested no relationship between the geometrical factors and the type of anti-rotation configuration.