Send to

Choose Destination
Korean J Orthod. 2017 May;47(3):207-212. doi: 10.4041/kjod.2017.47.3.207. Epub 2017 Mar 13.

Effects of a new type of clear overlay retainer on occlusal contacts.

Author information

Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
Division of Orthodontics, Department of Orofacial Science, University of California San Francisco, CA, USA.


The popularity of clear overlay retainers (CORs) has increased recently because of their advantages such as better esthetics, cost effectiveness, easy fabrication, and good compliance. However, a deficiency in posterior occlusal settling is a reported limitation of CORs. The aim of this study was to evaluate the posterior occlusal contact changes in a new type of clear orthodontic retainer called Oral-treaper (OTP), which consists of three layers and has stronger mechanical characteristics than do conventional retainers. Three patients who completed fixed orthodontic treatment received OTP as a removable retainer. Cast models were fabricated after the removal of fixed appliances (T1) and after 4 to 11 months of using the retainers (T2). We evaluated all the cast models to compare the post-orthodontic settling pattern during the use of the OTPs. The depth of occlusal contacts was evaluated using color maps. The OTP did not prevent vertical settling in all patients but resulted in an improvement in posterior occlusal contact points.


Clear overlay retainer; Occlusal contacts; Settling

Conflict of interest statement

The authors report no commercial, proprietary, or financial interest in the products or companies described in this article.

Supplemental Content

Full text links

Icon for The Korean Association of Orthodontists Icon for PubMed Central
Loading ...
Support Center