The bond failure rate of the full custom lingual bracket appliance system

Abstract

Objective
In case of lingual orthodontic treatment, the bonding failure is serious problem because orthodontists can not bond the bracket correctly. The purpose in this study was to evaluate the bonding failure rate using Incognito system.
Material and Methods
42 patients (7 male, 35 female) were treated with Incognito system in Inami orthodontic office. We studied to each patients about some items: bonding failure times, the kinds of teeth falling off the bracket, the rates of bonding failure in each teeth, the characters of teeth surface, the shape of bracket base and the kind of cement using at initial bonding.
Results
The average number of bonding failure times in all patients was 2.3 times. 43% patients of the total did not fallen off the bracket once. The bonding failure rate was the highest at the molars in upper and lower jaw. The restoration tooth showed higher rate of bonding failure than natural tooth. Furthermore, the bracket types of band and pad exhibited lower rate than narrower type of bracket base.
Conclusion
Bracket failure occurred easily in the part of molars and repaired tooth. Therefore, to prevent the bracket falling off, it is necessary to order a wide bracket base as possible and make some additional treatments before bracket bonding such as drilling the undercut when the tooth surface is repaired.