Analysis of anchorage control in different vertical skeletal pattern

doi:10.3877/cma.j.issn.1674-1366.2011.06.0012

Abstract

Abstract:

Objective

To study the anchorge effects of lower molars in different vertical skeletal patterns by light-segmented archwire.

Methods

Fifty cases with different vertical skeletal pattern were selected and two lower first bicuspids were extracted in all cases.In the first half year， lower cuspids were distalized with light-segmented archwire， and lower incisors were in the physiologic drift stage.Cephalograms and study models were recorded before and six months after the treatment， respectively.Parameters such as L6-MP， L6E-RL and L4 Space were measured and the data were analyzed by SPSS 10.0.

Results

L6-MP angles were different among different vertical skeletal patterns.L6-MP angle was decreased from 81.8° to 79.6° in high-angle skeletal pattern， from 83.1° to 82.0° in normal-angle pattern， and from 87.0° to 86.2° in low-angle pattern.

Conclusion

Vertical skeletal pattern is correlated with the angle of the lower first molar but not correlated with the value of the lower first molar adjustment.

Key words: Lower first molar, Vertical skeletal pattern, Light-segmented archwire

Xin-hua LU, Liping WU, Yue XU, Bin CAI. Analysis of anchorage control in different vertical skeletal pattern[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(06): 628-634.

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Figures/Tables 19

References 11

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测量项目	高角			均角			低角
测量项目	治疗前	6 个月	6 个月变化	治疗前	6 个月	6 个月变化	治疗前	6 个月	6 个月变化
SN-MP（°）	43.21 ± 3.64	43.48 ± 3.55	0.30 ± 1.37	34.29 ± 2.15	34.50 ± 2.36	0.23 ± 1.58	27.64 ± 4.67	27.53 ± 4.27	-0.14 ± 0.82
OP-FH（°）	19.90 ± 3.00	19.37 ± 3.06	-0.45 ± 0.97	15.72 ± 3.29	15.24 ± 3.16	-0.59 ± 1.07	12.15 ± 3.38	11.49 ± 3.61	-0.52 ± 1.09
L₆-MP（°）	81.81 ± 4.90	79.64 ± 4.21	-2.05 ± 2.86^a	83.07 ± 3.25	82.04 ± 3.07	-1.26 ± 2.22^a	86.95 ± 5.17	86.19 ± 6.14	-0.76 ± 2.49^a
L₆E-RL（mm）	23.46 ± 3.74	24.34 ± 3.33	1.02 ± 1.19^a	24.22 ± 4.09	25.46 ± 3.88	1.16 ± 0.89^a	24.56 ± 3.78	25.53 ± 4.13	0.97 ± 1.04^a
L₆A-RL（mm）	14.51 ± 4.94	15.85 ± 4.57	1.41 ± 1.64^a	17.05 ± 4.77	18.43 ± 4.45	1.38 ± 1.10^a	17.93 ± 4.96	19.12 ± 5.31	1.19 ± 0.65^a
L₆E-MP（mm）	35.99 ± 4.20	36.88 ± 3.92	0.96 ± 1.13^a	34.47 ± 3.35	35.23 ± 3.16	0.72 ± 0.49^a	35.01 ± 1.65	35.75 ± 1.93	0.74 ± 1.02^a
L₆A-MP（mm）	16.96 ± 4.62	18.03 ± 4.48	1.19 ± 1.06^a	15.71 ± 3.78	16.59 ± 3.58	0.83 ± 0.58^a	16.35 ± 1.90	17.21 ± 1.95	0.86 ± 0.99^a
L₄ 间隙（mm）	6.66 ± 0.75	1.58 ± 0.80	5.08 ± 1.24^a	6.68 ± 0.76	1.70 ± 0.87	4.98 ± 1.18^a	6.68 ± 0.64	1.87 ± 1.65	4.81 ± 1.38^a

测量项目	高角			均角			低角
测量项目	治疗前	6 个月	6 个月变化	治疗前	6 个月	6 个月变化	治疗前	6 个月	6 个月变化
SN-MP（°）	43.21 ± 3.64	43.48 ± 3.55	0.30 ± 1.37	34.29 ± 2.15	34.50 ± 2.36	0.23 ± 1.58	27.64 ± 4.67	27.53 ± 4.27	-0.14 ± 0.82
OP-FH（°）	19.90 ± 3.00	19.37 ± 3.06	-0.45 ± 0.97	15.72 ± 3.29	15.24 ± 3.16	-0.59 ± 1.07	12.15 ± 3.38	11.49 ± 3.61	-0.52 ± 1.09
L₆-MP（°）	81.81 ± 4.90	79.64 ± 4.21	-2.05 ± 2.86^a	83.07 ± 3.25	82.04 ± 3.07	-1.26 ± 2.22^a	86.95 ± 5.17	86.19 ± 6.14	-0.76 ± 2.49^a
L₆E-RL（mm）	23.46 ± 3.74	24.34 ± 3.33	1.02 ± 1.19^a	24.22 ± 4.09	25.46 ± 3.88	1.16 ± 0.89^a	24.56 ± 3.78	25.53 ± 4.13	0.97 ± 1.04^a
L₆A-RL（mm）	14.51 ± 4.94	15.85 ± 4.57	1.41 ± 1.64^a	17.05 ± 4.77	18.43 ± 4.45	1.38 ± 1.10^a	17.93 ± 4.96	19.12 ± 5.31	1.19 ± 0.65^a
L₆E-MP（mm）	35.99 ± 4.20	36.88 ± 3.92	0.96 ± 1.13^a	34.47 ± 3.35	35.23 ± 3.16	0.72 ± 0.49^a	35.01 ± 1.65	35.75 ± 1.93	0.74 ± 1.02^a
L₆A-MP（mm）	16.96 ± 4.62	18.03 ± 4.48	1.19 ± 1.06^a	15.71 ± 3.78	16.59 ± 3.58	0.83 ± 0.58^a	16.35 ± 1.90	17.21 ± 1.95	0.86 ± 0.99^a
L₄ 间隙（mm）	6.66 ± 0.75	1.58 ± 0.80	5.08 ± 1.24^a	6.68 ± 0.76	1.70 ± 0.87	4.98 ± 1.18^a	6.68 ± 0.64	1.87 ± 1.65	4.81 ± 1.38^a

测量项目	治疗前		6 个月		6 个月半年变化
测量项目	F	差异性	F	差异性	F	差异性
SN-MP（°）	59.37^a	L＜N＜H	59.01^a	L＜N＜H	0.39
OP-FH（°）	11.69^a	L＜N＜H	12.01^a	L＜N＜H	0.08
L₆-MP（°）	6.28^b	H，N＜L	9.68^a	H＜L	0.96
L₆E-RL（mm）	0.56		0.66		0.18
L₆A-RL（mm）	2.49		2.47		0.09
L₆E-MP（mm）	0.19		0.38		0.40
L₆A-MP（mm）	0.01		0.08		0.94
L₄ 间隙（mm）	0.43		0.77		0.43

测量项目	治疗前		6 个月		6 个月半年变化
测量项目	F	差异性	F	差异性	F	差异性
SN-MP（°）	59.37^a	L＜N＜H	59.01^a	L＜N＜H	0.39
OP-FH（°）	11.69^a	L＜N＜H	12.01^a	L＜N＜H	0.08
L₆-MP（°）	6.28^b	H，N＜L	9.68^a	H＜L	0.96
L₆E-RL（mm）	0.56		0.66		0.18
L₆A-RL（mm）	2.49		2.47		0.09
L₆E-MP（mm）	0.19		0.38		0.40
L₆A-MP（mm）	0.01		0.08		0.94
L₄ 间隙（mm）	0.43		0.77		0.43

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