Comparison of the Treatment Effectiveness between Two Vanbeek Activators with Different Load-Points of Extraoral Force in the Treatment of Children’s Skeletal Class Ⅱ Malocclusion

Abstract

Abstract: Objective To compare the treatment effectiveness of two kinds of Vanbeek activators with different load-points of extraoral force in the treatment of children’s skeletal class Ⅱ malocclusion. Methods Thirty cases were included from January 2019 to December 2020. In the experimental group, improved Vanbeek activators with facebows extending between central and lateral incisors were used. In the control group, conventional Vanbeek activators with facebows extending between first and second premolars were used. Pretreatment and post-treatment lateral cephalometric radiographs of patients were collected for measurement. Results After treatment, the MP-FH (P=0.014), ANS-Me/Ar-Go ratio (P=0.042) and OP-FH (P=0.013) in the experimental group decreased significantly than the ones in the control group. between two groups in the change of SNA, SNB, ANB, Y axis angle, ANS-Me/N-Me ratio, U1-SN, and L1-MP, the difference is not statistically significant(P>0.05). Conclusion The load-point of improved Vanbeek activator was in front of the resistance centers of upper arch and maxilla, which led to counter clockwise rotation of jaws and was effective in vertical control in moderate to high angle children with skeletal class Ⅱ malocclusion.

Key words: Orthopedic treatment, Facebow, Skeletal class II malocclusion

CLC Number:

R783.5

KE Yun-yan, ZHANG Li-gang, YING Li-zhen, CHEN Xue-peng. Comparison of the Treatment Effectiveness between Two Vanbeek Activators with Different Load-Points of Extraoral Force in the Treatment of Children’s Skeletal Class Ⅱ Malocclusion[J]. ZHONGHUA YANGSHENG BAOJIAN, 2024, 42(13): 5-8.

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