Abstract: The maxillary protraction device has become the most widely used orthodontic orthodontic treatment for skeletal class III malocclusion due to its low cost and excellent effect on maxillary growth. The effect of anterior traction is influenced by multiple factors, and it also affects the other structures of the craniofacial region. This article reviews the mechanism and timing of anterior traction, the factors that affect the effect of pretraction therapy, the influence of other structures after craniofacial treatment and the application in clinical practice.

Key words: anterior traction, class III malocclusion, factors