Journal of Oral Science Research ›› 2015, Vol. 31 ›› Issue (12): 1247-1250.

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Cephalometric Analysis for Skeletal Angle Class Ⅲ Malocclusion Patients in Retruded Contact Position.

YANG Yi-ming1, CHEN Lin-ling1, ZHANG Zhe-chen1, Liao Qian2.   

  1. 1.Department of Orthodontics, College of Stomatology, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China;
    2. Department of General Dentistry, College of Stomatology, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China
  • Received:2015-03-27 Online:2015-12-28 Published:2016-03-21

Abstract: Objective: To investigate the difference of cephalometric analysis between intercuspal position (ICP) and retruded contact position (RCP) in skeletal Class Ⅲ malocclusion patients. Methods: Included in this study were 16 skeletal Class Ⅲ malocclusion patients with functional mandibular displacement. Lateral cephalograms in both ICP and RCP positions were taken and analyzed. Results: The analysis of skeletal indices showed that SNB angle, Angle of convenxity, FMA angle, MP-SN angle, Y axis angle, distance from N-per to Pog, ANB angle, Wits, APDI, Cross overjet and ODI were significantly different between two positions (P<0.001). The analysis of dental indices showed that U1-L1 angle and FMA angle were statistically different (P<0.01 and P<0.001, respectively). The analysis of soft tissue indices showed that the distance from O-M to Pog' and Z angle were statistically different (P<0.001 and P<0.01, respectively). Conclusion: It is important to take and analyze lateral cephalogram in retruded contact position for diagnosing and treating skeletal Angle Class Ⅲ patients with functional mandibular displacement.

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