The application of miniscrews in bimaxillaryprotrusion patients with gummy smile

doi:10.3877/cma.j.issn.1674-1366.2015.05.010

Abstract

Abstract:

Objective

To evaluate the clinical outcome of miniscrews in treating bimaxillary protrusion patients with gummy smile.

Methods

Eight bimaxillary protrusion adults with gummy smile were selected for the study. Miniscrews were inserted in anterior and posterior alveolar process. The incisors were retruded and intruded by means of the miniscrew anchorage. The pre-and post-treatment cephalometric images and models were measured for the statistical analysis.

Results

Statistical significant differences were shown between the pre-and post-treatment incisor inclination (U1-SN: t = 11.993, P = 0.001; L1-MP: t = 6.439, P = 0.001) . After treatment, statistical significant differences were also shown in the vertical position of both upper and lower incisors (U1/PP: t = 2.591, P = 0.018; L1/MP: t = 4.339, P = 0.002) . The soft tissue profile and the gum exposure were improved (GSL: t = 3.198, P = 0.008) .

Conclusion

Placement of miniscrews in both anterior and posterior alveolar process to retrude and intrude the incisors is remcommended to bimaxillary protrusion patients with gummy smile.

Key words: Miniscrew, Gummy smile, Bimaxillary protrusion

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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Figures/Tables 4

References 16

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组别	SNA（°）	SNB（°）	ANB（°）	FH-MP（°）	U1-SN（°）	L1-MP（°）	U1-L1（°）	U6/PP（mm）	U1/PP（mm）	L1/MP（mm）	U1-E1（mm）	L1-E1（mm）	Po-NB（mm）	GSL（mm）
治疗前	82.6 ± 3.1	80.2 ± 2.2	3.2 ± 1.7	33.8 ± 5.4	117.1 ± 8.4	95.9 ± 4.5	108.5 ± 7.9	20.1 ± 3.3	31.5 ± 2.8	41.6 ± 4.7	6.7 ± 2.7	7.1 ± 2.1	2.3 ± 1.7	3.8 ± 1.2
治疗后	82.4 ± 2.5	79.6 ± 3.7	2.7 ± 2.1	32.0 ± 6.9	103.2 ± 4.7	91.1 ± 3.6	123.0 ± 6.2	19.2 ± 2.4	29.6 ± 1.4	43.2 ± 3.5	3.6 ± 1.9	3.3 ± 1.9	2.5 ± 1.1	1.9 ± 0.8
t值	0.973	2.119	1.878	1.875	11.993	6.439	23.522	1.361	2.591	4.339	6.963	9.731	1.426	3.198
P值	0.181	0.150	0.051	0.051	0.001	0.001	0.001	0.108	0.018	0.002	0.001	0.001	0.098	0.008

组别	SNA（°）	SNB（°）	ANB（°）	FH-MP（°）	U1-SN（°）	L1-MP（°）	U1-L1（°）	U6/PP（mm）	U1/PP（mm）	L1/MP（mm）	U1-E1（mm）	L1-E1（mm）	Po-NB（mm）	GSL（mm）
治疗前	82.6 ± 3.1	80.2 ± 2.2	3.2 ± 1.7	33.8 ± 5.4	117.1 ± 8.4	95.9 ± 4.5	108.5 ± 7.9	20.1 ± 3.3	31.5 ± 2.8	41.6 ± 4.7	6.7 ± 2.7	7.1 ± 2.1	2.3 ± 1.7	3.8 ± 1.2
治疗后	82.4 ± 2.5	79.6 ± 3.7	2.7 ± 2.1	32.0 ± 6.9	103.2 ± 4.7	91.1 ± 3.6	123.0 ± 6.2	19.2 ± 2.4	29.6 ± 1.4	43.2 ± 3.5	3.6 ± 1.9	3.3 ± 1.9	2.5 ± 1.1	1.9 ± 0.8
t值	0.973	2.119	1.878	1.875	11.993	6.439	23.522	1.361	2.591	4.339	6.963	9.731	1.426	3.198
P值	0.181	0.150	0.051	0.051	0.001	0.001	0.001	0.108	0.018	0.002	0.001	0.001	0.098	0.008

组别	CIUIL	LIUIL	CUIL	OB	OJ
治疗前	9.5 ± 0.7	8.5 ± 0.5	9.0 ± 0.8	3.5 ± 1.3	2.9 ± 1.2
治疗后	8.9 ± 0.6	8.1 ± 0.3	8.6 ± 0.5	3.2 ± 1.1	2.7 ± 1.5
t值	3.467	4.119	2.133	1.364	1.978
P值	0.005	0.002	0.035	0.107	0.044

组别	CIUIL	LIUIL	CUIL	OB	OJ
治疗前	9.5 ± 0.7	8.5 ± 0.5	9.0 ± 0.8	3.5 ± 1.3	2.9 ± 1.2
治疗后	8.9 ± 0.6	8.1 ± 0.3	8.6 ± 0.5	3.2 ± 1.1	2.7 ± 1.5
t值	3.467	4.119	2.133	1.364	1.978
P值	0.005	0.002	0.035	0.107	0.044

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