Soft-tissue and hard-tissue profile changes following orthodontic treatment of bimaxillary protrusion in adults with teeth extraction

doi:10.3877 / cma.j.issn.1674-1366.2009-04-013

Abstract

Abstract:

Objective

To investigate the changes of soft and hard-tissue profile following orthodontic treatment of bimaxillary protrusion in adults with teeth extraction.

Methods

16 adult bimaxillary protrusion cases were selected to be treated with straight wire technique consisting of teeth extraction. Cephalometrics were taken before and after treatment. The changes of soft and hard-tissue profile were studied with computer-aided X-ray cephalometric analysis.

Results

（1）The relationship between the maxillary and the mandible did not change significantly ［SNA， SNB，ANB had no significant difference in cephalometric measurement （P ＞0.05）］. （2）L1-MP， U1-L1，U1-NA， L1-NB， U1-L1 angle changes in hard tissue had significant difference in cephalometric measurement （P ＜0.01）. The upper and lower anterior teeth were more retrusive， and the tripping of incisor decreased significantly. （3）Analysis of related projects cephalometric showed that lateral appearance improved significantly， Soft tissue Cephalometric related Cm-Sn-Ls、UL-UI、LL-LI、Pos-Po、A'UL-B'LL measurements increased significantly； Ns-Sn-Pog and other indicators in soft tissue also improved.

Conclusion

Soft and hard-tissue profile improve significantly after orthodontic treatment with teeth extraction in bimaxillary protrusive adults， however， the relationship between the maxillary and the mandible do not change significantly.

Key words: Bimaxillary protrusion, Maloulusion, Orthodotics, Molars extraction

Ming LIN, Da-wei WANG. Soft-tissue and hard-tissue profile changes following orthodontic treatment of bimaxillary protrusion in adults with teeth extraction[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2009, 3(04): 424-429.

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Figures/Tables 4

References 12

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测量项目	治疗前	治疗后	变化
SNA（°）	81.23±3.08	79.98±3.54	-0.25±1.20^*
SNB（°）	76.92±3.24	77.06±3.07	0.14±1.46^*
ANB（°）	4.01±1.36	3.85±1.84	-0.16±1.50^*
U1-NA（°）	35.62±5.23	18.31±6.81	-17.31±7.74^^
U1-NA（mm）	11.05±2.19	2.98±2.60	-8.52±3.31^^
L1-NB（°）	36.48±4.86	26.31±5.06	-10.17±5.42^^
L1-NB（mm）	10.32±2.43	5.40±2.05	-4.90±1.06^^
L1-MP	98.52±2.56	91.45±2.33	-7.07±5.2^^
U1-L1（°）	102.17±6.81	134.23±9.05	32.06±6.46^^
Ns'-Sn'-Pg'（°）	21.76±3.40	18.83±3.36	-2.93±2.13^^
Cm-Sn-Ls（°）	86.06±3.75	96.59±4.20	10.53±4.07^^
UL-UI（°）	10.35±2.35	13.08±1.56	2.75±0.79^^
LL-LI（°）	12.67±2.10	13.87±2.73	1.20±0.03^^
Pos-Po（°）	11.94±2.36	13.19±1.48	1.25±0.88^^
A'UL-B'LL（°）	112.62±3.07	123.90±5.37	11.28±3.45^^

测量项目	治疗前	治疗后	变化
SNA（°）	81.23±3.08	79.98±3.54	-0.25±1.20^*
SNB（°）	76.92±3.24	77.06±3.07	0.14±1.46^*
ANB（°）	4.01±1.36	3.85±1.84	-0.16±1.50^*
U1-NA（°）	35.62±5.23	18.31±6.81	-17.31±7.74^^
U1-NA（mm）	11.05±2.19	2.98±2.60	-8.52±3.31^^
L1-NB（°）	36.48±4.86	26.31±5.06	-10.17±5.42^^
L1-NB（mm）	10.32±2.43	5.40±2.05	-4.90±1.06^^
L1-MP	98.52±2.56	91.45±2.33	-7.07±5.2^^
U1-L1（°）	102.17±6.81	134.23±9.05	32.06±6.46^^
Ns'-Sn'-Pg'（°）	21.76±3.40	18.83±3.36	-2.93±2.13^^
Cm-Sn-Ls（°）	86.06±3.75	96.59±4.20	10.53±4.07^^
UL-UI（°）	10.35±2.35	13.08±1.56	2.75±0.79^^
LL-LI（°）	12.67±2.10	13.87±2.73	1.20±0.03^^
Pos-Po（°）	11.94±2.36	13.19±1.48	1.25±0.88^^
A'UL-B'LL（°）	112.62±3.07	123.90±5.37	11.28±3.45^^

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[2]	Yongjian Xie, Lixiang Mai, Yue Xu. Sexual difference in the nose-lip-chin relationship of adults with bimaxillary protrusion before and after orthodontic treatment [J]. Chinese Journal of Stomatological Research(Electronic Edition), 2017, 11(04): 230-233.
[3]	Zelong Luo, Zhifang Li. The application of miniscrews in bimaxillaryprotrusion patients with gummy smile [J]. Chinese Journal of Stomatological Research(Electronic Edition), 2015, 09(05): 405-408.

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