Risk factors for second molar scissors-bite in patients: a case-control study

doi:10.11958/20221538

Abstract

Abstract:

Objective To analyze the relationship between patients with second molar scissors-bite and cephalometric indicators, to assess risk factors associated with the pathogenesis of second molar scissors-bite, and to explore the sensitive indicators in different populations. Methods A case-control study was conducted with 106 patients with second molar scissors-bite (the case group). The control group was 102 patients without scissors-bite and with bilateral molars and cusps in a neutral relationship. Differences in age, sex, skeletal and dental measurements were compared between the two groups of patients. Risk factors associated with second molar scissors-bite were further analyzed using multifactor Logistic regression. Results Univariate analysis showed that five measures, ∠ANB, Wits value, OB, OJ and ∠SNB were sensitive indicators of second molar scissors-bite. Logistic regression showed that for the entire study population, low angle (OR=2.907, 95%CI: 1.157-7.307), ∠ANB (OR=1.643, 95%CI: 1.203-2.245) and OB (OR=1.442, 95%CI: 1.116-1.862) were risk factors for the pathogenesis of second molar scissors-bite. In males, large ∠ANB was the main risk factor for the pathogenesis of second molar scissors-bite. In females, the main risk factors for the pathogenesis of second molar scissors-bite were high angle and larger ∠ANB and OB. In adolescents, ∠ANB and OB value, and in adults, ∠ANB and low angle were risk factors for the pathogenesis of second molar scissors-bite. Conclusion Skeletal class Ⅱ is the most important risk factor for second molar scissors-bite. In addition, high angle and deep overbite in women, deep overbite in adolescents and low angle in adults are all at high risk of the pathogenesis of second molar scissors-bite.

Key words: dental occlusion, overbite, malocclusion, angle class Ⅱ, risk factors, scissors-bite, ANB, OB, high angle, low angle

CLC Number:

R783.5

Figures/Tables 4

References 21

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组别	n			男性	年龄≤ 18岁		垂直向							∠SNA（°）
组别	n			男性	年龄≤ 18岁		均角			低角	高角			∠SNA（°）
对照组	102			24（23.5）	44（43.1）		70（68.6）			24（23.5）	8（7.8）			81.83±3.64
病例组	106			35（33.0）	44（41.5）		44（41.5）			30（28.3）	32（30.2）			81.43±3.87
χ²或t				2.304	0.056		20.927^＊＊							0.760
组别		∠SNB（°）				∠U1-SN（°）			∠L1-MP（°）			∠ANB（°）
对照组		78.87±3.46				109.66±6.35			98.00±6.20			2.90（2.27，3.90）
病例组		76.56±4.07				108.59±6.95			99.19±7.51			5.10（2.97，6.70）
t或Z		4.387^＊＊				1.162			1.245			6.588^＊＊
组别			Wits值（mm）					OB（mm）					OJ（mm）
对照组			-0.40（-1.30，0.82）					2.00（1.17，3.00）					4.30（3.60，5.20）
病例组			2.45（0.32，4.90）					3.10（1.90，4.70）					5.35（3.90，6.80）
Z			6.724^＊＊					5.100^＊＊					4.113^＊＊

组别	n			男性	年龄≤ 18岁		垂直向							∠SNA（°）
组别	n			男性	年龄≤ 18岁		均角			低角	高角			∠SNA（°）
对照组	102			24（23.5）	44（43.1）		70（68.6）			24（23.5）	8（7.8）			81.83±3.64
病例组	106			35（33.0）	44（41.5）		44（41.5）			30（28.3）	32（30.2）			81.43±3.87
χ²或t				2.304	0.056		20.927^＊＊							0.760
组别		∠SNB（°）				∠U1-SN（°）			∠L1-MP（°）			∠ANB（°）
对照组		78.87±3.46				109.66±6.35			98.00±6.20			2.90（2.27，3.90）
病例组		76.56±4.07				108.59±6.95			99.19±7.51			5.10（2.97，6.70）
t或Z		4.387^＊＊				1.162			1.245			6.588^＊＊
组别			Wits值（mm）					OB（mm）					OJ（mm）
对照组			-0.40（-1.30，0.82）					2.00（1.17，3.00）					4.30（3.60，5.20）
病例组			2.45（0.32，4.90）					3.10（1.90，4.70）					5.35（3.90，6.80）
Z			6.724^＊＊					5.100^＊＊					4.113^＊＊

变量	B	SE	Wald χ²	P	OR（95%CI）
性别	-0.579	0.417	1.926	0.165	0.560（0.247~1.270）
垂直向			8.113	0.017
低角	1.067	0.470	5.150	0.023	2.907（1.157~7.307）
高角	0.937	0.567	2.728	0.099	2.552（0.840~7.756）
∠ANB	0.497	0.159	9.738	0.002	1.643（1.203~2.245）
Wits值	0.022	0.088	0.066	0.797	1.023（0.861~1.214）
OB	0.366	0.131	7.851	0.005	1.442（1.116~1.862）
OJ	0.024	0.129	0.035	0.851	1.025（0.795~1.320）
∠SNB	-0.100	0.063	2.541	0.111	0.905（0.800~1.023）
年龄	0.370	0.381	0.945	0.331	1.448（0.686~3.055）
常数项	4.617	4.874	0.898	0.343	101.231

变量	B	SE	Wald χ²	P	OR（95%CI）
性别	-0.579	0.417	1.926	0.165	0.560（0.247~1.270）
垂直向			8.113	0.017
低角	1.067	0.470	5.150	0.023	2.907（1.157~7.307）
高角	0.937	0.567	2.728	0.099	2.552（0.840~7.756）
∠ANB	0.497	0.159	9.738	0.002	1.643（1.203~2.245）
Wits值	0.022	0.088	0.066	0.797	1.023（0.861~1.214）
OB	0.366	0.131	7.851	0.005	1.442（1.116~1.862）
OJ	0.024	0.129	0.035	0.851	1.025（0.795~1.320）
∠SNB	-0.100	0.063	2.541	0.111	0.905（0.800~1.023）
年龄	0.370	0.381	0.945	0.331	1.448（0.686~3.055）
常数项	4.617	4.874	0.898	0.343	101.231

变量	B	SE	Wald χ²	P	OR（95%CI）
男性
垂直向			2.249	0.325
低角	1.239	1.026	1.457	0.227	3.451（0.462~25.783）
高角	-0.929	1.118	0.690	0.406	0.395（0.044~3.536）
∠ANB	0.862	0.358	5.805	0.016	2.368（1.174~4.776）
Wits值	-0.118	0.211	0.310	0.578	0.889（0.587~1.345）
OB	0.619	0.323	3.681	0.055	1.857（0.987~3.494）
OJ	-0.197	0.271	0.528	0.468	0.821（0.483~1.397）
∠SNB	-0.144	0.125	1.324	0.250	0.866（0.677~1.107）
年龄	0.636	0.914	0.484	0.487	1.889（0.315~11.333）
常数项	7.627	9.533	0.640	0.424	2 052.563
女性
垂直向			8.879	0.012
低角	0.927	0.550	2.835	0.092	2.526（0.859~7.427）
高角	1.794	0.744	5.819	0.016	6.016（1.400~25.848）
∠ANB	0.381	0.192	3.965	0.046	1.464（1.006~2.132）
Wits值	0.074	0.108	0.464	0.496	1.076（0.871~1.331）
OB	0.301	0.149	4.090	0.043	1.352（1.009~1.810）
OJ	0.105	0.155	0.460	0.498	1.110（0.820~1.503）
∠SNB	-0.092	0.077	1.435	0.231	0.912（0.784~1.060）
年龄	0.445	0.453	0.967	0.325	1.561（0.643~3.792）
常数项	3.486	5.969	0.341	0.559	32.644