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A study on maxillary growth vector with different sagittal skeletal malocclusion between pre-growth and post-growth spurts.

FENG Xiao-xia1,CHENG Qian1,XU Zhen-rui1,TANG Na1,ZHANG Lin-kun2,XU Meng-ting1,LI Wei-peng1,YANG Pu1,ZHAO Mei-ying1,ZHAO Zhi-he1.1.Department.of Orthdontics,West China College of Stomatology,Sichuan University,Sichuan Chengdu 610041,China;2.Department.of Orthdontics,Stomatological Hospital of Nankai University,Tianjin 300041,China.  
Objective:To figure out the differences of maxillary growth vector with various sagittal skeletal malocclusions between pre-and post-growth spurts.Method:one hundred and seventy nine cases with different sagittal skeletal malocclusions were selected and divided into six groups according to saggital skeletal patterns and cervical vertebral stages:CVS1,2-classⅠ(n=32),CVS1,2-classⅡ(n=33),CVS1,2-classⅢ(n=31);CVS5,6-classⅠ(n=29),CVS5,6-classⅡ(n=29),CVS5,6-classⅢ(n=25),which were all taken lateral cephalograms.The ∠SN-C axis(θ)was measured and observation and statics analysis were done to understand the differences of maxillary growth vector between pre-and post-growth spurts and differences among saggital skeletal patterns.Result:The vector of the growth axis,named by the angle SN-C axis,of skeletal class Ⅲ,increases from 47.37 degrees to 49.95 degrees with a mean 2.59-degrees increment.Of classⅡ,it increases from a mean of 47.14 degrees to 48.25 degrees with a mean 1.11-degrees increment,while of class Ⅰ,it increases from 48.42 degrees to 48.88 degrees with only 0.46 degrees increment.Conclusion:During circumpubertal period,different saggital skeletal patterns owns its unique increments of maxillary growth vector.In classⅢ,maxilla statically significantly growths vertically and the vertical increments of C-axis angle in classⅡ is much more than that in classⅠ.Also,C-axis angle of class Ⅰis relatively stable during growth period.
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