Drs. Neamat Hassan and Hassan Ziada (both Dental) co-authored an article, "Implant impression Accuracy of Parallel and Non-parallel Implants: A Comparative In-vitro Analysis of Open and Closed Tray Techniques," which appeared in the International Journal of Implant Dentistry’s online version. The study concluded there were generally no significant differences between open and closed, although better results were obtained for the open tray techniques. The open tray technique also provided a better result for non-parallel implants than the closed tray technique. The journal is affiliated with the German Society of Oral Implantology and the Japanese Society of Oral Implantology.