Background: Malocclusion is a common oral disease. Wearing the lingual or labial straight
archwire appliance is an effective treatment method. For the traditional appliance, the bracket is a non
self-ligating structure. Orthodontic archwire is fixed by the ligature, so the ligation and removal operation
is time-consuming. And the end of the ligation wire may be easy to scratch the oral cavity and the
aggregation bacteria. With the continuous development of orthodontic technique, the self-ligating
bracket is the development direction for future clinical orthodontic treatment, and has become an advanced
Objective: To provide an overview of recent passive self-ligating brackets, and introduce their respective
characteristics and development.
Method: The recent typical brackets are divided into passive self-ligating bracket, active self-ligating
bracket and interactive self-ligating bracket. This paper reviews various representative patents related to
passive self-ligating bracket. The structural characteristics and applications of the typical passive selfligating
bracket are introduced.
Results: The differences of different types of passive self-ligating bracket are compared and analyzed,
and the structural characteristics are concluded. The main problems in its development are analyzed, the
development trend is foreseen, and the current and future research of the patents on passive self-ligating
bracket is discussed. The passive self-ligating bracket, because of its small friction, gentle orthodontic
force, discomfort reduction, chair time reduction and excellent oral hygiene maintenance, is recognized
and applied by more and more orthodontic doctors.
Conclusion: The passive self-ligating bracket has important practical significance. And further improvements
are needed in the aspects of structure, cost, use and reliability, bracket base failure of the
passive self-ligating bracket, and detachment of locking system from bracket’s main structure. More patents
on the passive self-ligating bracket should be invented.