West China Journal of Stomatology

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Cephalometric Evaluation of the Effects of Pendulum Appliance on Various Vertical Growth Patterns

WU Yong1,LUO Song-jiao1,ZHAO Zhi-he1,YUANXiao2,ZHENG Yi1,LIUYing1,MIXiao-hui1,NILin1   

  1. 1.Dept.ofOrthodontics,West China College of Stomatology,Sichuan University,Chengdu610041,China; 2.Dept.of Orthodontics,Shanghai Ninth People′sHospital,Shanghai SecondMedical University,Shanghai200011,China
  • Received:2005-02-25 Revised:2005-02-25 Online:2005-02-20 Published:2005-02-20

Abstract:

Objective The aim of this studywas to investigate the effects of the pendulum appliance in treating dental ClassⅡ patients with various vertical growth patterns.Methods The samples (n=30) were divided into three groups equally based on their FMA. Pretreatment and post-treatment cephalometric radiographs were taken to measure the changes.Results The amount of upper molar distalization in the low-angle group was the fewest, and that in the high-angle group was the most. Upper molars had been intruded insignificantly. The amount of anchorage loss at the first premolars and overjet increased at incisorswas different in the three groups. The biggest change happened in the low-angle group, and the smallest in the high-angle group.Conclusion  The results of this study showed that pendulum appliance could move the uppermolars distally in a short period of time. The upper molars in different groups were intruded insignificantly. Pendulum appliance could be used to move the upper molars distally in high-angle cases.

Key words: pendulum appliance, molar distalization, vertical growth patterns, Angle′s ClassⅡmalocclusion