Dr. Sifakakis is Assistant Professor in the Department of Orthodontics of the School of Dentistry of the National and Kapodistrian University of Athens, Greece. He serves or has served as Assoc. Editor of “Journal of Dental Biomechanics” and as Reviewer in 15 international dental journals. He has supervised several research projects, including seven Master Degree and two Doctorate Degree Theses.
Currently, his main clinical and research interests include the subjects of “Biomechanics”, “Aligners”, “Orthodontic biomaterials” and “Fixed retainers”.
He has built successful collaborations between the Departments of Orthodontics of Athens, Bern and Zurich, and between the Departments of Biomaterials of Athens and Bonn. He has received a research grant for academics from the German Academic Exchange Service DAAD, (2014) and the Align Technology Global Funding Awarded Towards Advancing Orthodontic and Dental Research (2017).
He is the coauthor of several book chapters, has published more than 40 scientific publications and has presented more than 30 lectures and courses in congresses.
INVITED LECTURE: Evidence on fixed retention
The aim of this lecture is to present and discuss the basic principles regarding the construction, the effectiveness and the hygiene effects of fixed retention after orthodontic treatment. Definite practice guidelines for orthodontic retention are not available, and there is no agreement among orthodontists regarding the optimal type of wire or bonding adhesive that should be used for fixed retainers. The most commonly fixed retainers used are the thick mandibular canine-and-canine and the thin, flexible, spiral wire retainers. The former type could lead to a small increase in mandibular incisor irregularity during the retention period, however displays lower detachment rate than the former retainer type. Long-term retention of mandibular incisor alignment is quite compatible with periodontal health.
Unfortunately, fundamental questions remain when considering the fixed retention. Clinical research has shown that even with bonded retainers in place, not only does relapse still occur but also some unexpected posttreatment changes that cannot be explained by the pretreatment malocclusion. These facts reveal the knowledge gaps that exist regarding the underlying biological mechanisms of relapse, as well as the in vivo behavior of the biomaterials. Recent clinical and laboratory evidence on fixed retention will be discussed.