上颌第一磨牙与后牙牙列磨耗特征的相关性研究

doi:10.13591/j.cnki.kqyx.2026.09.002

Abstract

Abstract:

Objective To explore the correlation between the wear area of the four cusps of maxillary first molars and the height of functional/non-functional cusps of maxillary posterior dentition cusp, cusp inclination, wear area and contact area (including the maxillary first molar), in order to provide a scientific basis for artificial intelligence to predict the wear surface characteristics of maxillary first molars. Methods A total of 196 patients were included, with 784 upper posterior teeth (excluding third molars) analyzed. Based on intraoral scan data, the functional cusp/non-functional cusp height, cusp slope, wear area, and total tooth contact area were measured using Geomagic Qualify software. Independent sample t-tests were used to compare the differences in total wear area of the maxillary first molars between different genders. Pearson correlation analysis was applied to study the relationships between variables, and simple linear regression was used to examine the association between age and total wear area of the maxillary first molars. Based on this, variables that showed statistical significance in univariate analysis were used as independent variables, while the wear areas of the mesio-buccal cusp, disto-buccal cusp, mesio-lingual cusp, disto-lingual cusp, and total wear area of the maxillary first molar were used as dependent variables in multiple linear regression analyses. This allowed analysis of the effects of each influencing factor on the wear of individual cusps and the total wear area, and to build corresponding predictive models for wear area. Results Tooth wear increases with age, and there is no significant difference in wear between genders. The wear areas among the four cusps of the upper first molar are significantly related (P<0.05). The total wear area of the upper first molar is significantly related to the wear areas of the cusps of the upper first premolar, upper second premolar, and upper second molar (P<0.05), with the strongest correlation seen with the mesio-buccal cusp of the upper second molar (P<0.05). The buccal cusp slope of the upper first premolar is significantly negatively correlated with the total wear area of the upper first molar (P<0.05). The wear areas of the four cusps of the upper first molar are positively correlated with the occlusal contact areas of the upper first premolar, upper second premolar, and upper second molar (P<0.05), but the correlation is relatively weak. Conclusion According to the known wear data of the remaining teeth, the wear data of each cusp of the maxillary first molars can be obtained, and the corresponding mathematical model can be constructed to guide the occlusal analysis and reconstruction of the missing teeth before full crown restoration.

Key words: tooth wear, correlation analysis, occlusal contact, oral prosthetics, digital impression

CLC Number:

R782.6

JI Zhongqian, WANG Han, DING Tao, XIE Lizhe, HU Jian. Study on the correlation between the wear characteristics of maxillary first molars and posterior dentition[J]. Stomatology, 2026, 46(9): 652-657.

Figures/Tables 8

Fig.1

Fig.2

Fig.3

Tab.1

Tab.2

Tab.3

Tab.4

Correlation analysis between variables r"

变量	上6MB 磨耗面积	上6DB 磨耗面积	上6MP 磨耗面积	上6DP 磨耗面积	上6总磨耗面积
上4B磨耗面积	0.278^*	0.326	0.224^*	0.164^*	0.304^*
上4P磨耗面积	0.115	0.424	0.246^*	0.244^*	0.282^*
上4B牙尖高度	-0.062	-0.002	-0.079	0.079	-0.249
上4P牙尖高度	-0.216^*	-0.227^*	-0.233^*	-0.201	-0.047
上4B牙尖斜度	-0.196	-0.089	-0.232^*	0.011	-0.197^*
上4P牙尖斜度	-0.214^*	-0.246^*	-0.232^*	-0.286^*	-0.303
上4接触面积	0.188^*	0.266^*	0.145	0.159^*	0.074
上5B磨耗面积	0.371^*	0.436^*	0.423^*	0.412^*	0.506^*
上5P磨耗面积	0.270^*	0.461	0.357^*	0.257^*	0.339^*
上5B牙尖高度	-0.006	-0.042	-0.025	-0.016	-0.366^*
上5P牙尖高度	-0.302^*	-0.328^*	-0.349^*	-0.209^*	0.056
上5B牙尖斜度	-0.050	-0.081	-0.065	-0.066	-0.112
上5P牙尖斜度	-0.287^*	-0.281^*	-0.322^*	-0.241^*	-0.361
上5接触面积	0.289^*	0.258^*	0.167^*	0.159^*	0.326^*
上6MB磨耗面积	-	0.543^*	0.626^*	0.450^*	0.805^*
上6DB磨耗面积	0.543^*	-	0.597^*	0.494^*	0.743^*
上6MP磨耗面积	0.626^*	0.597^*	-	0.497^*	0.853^*
上6DP磨耗面积	0.450^*	0.494^*	0.497^*	-	0.724^*
上6MB牙尖斜度	0.013	0.013	0.054	-0.018	0.073
上6DB牙尖斜度	-0.124	-0.152^*	-0.153^*	-0.055	-0.127
上6MP牙尖斜度	-0.380^*	-0.305^*	-0.395^*	-0.174^*	-0.412^*
上6DP牙尖斜度	-0.263^*	-0.161^*	-0.205^*	-0.200^*	-0.271^*
上6接触面积	0.296^*	0.227^*	0.194^*	0.245^*	0.313^*
上7MB磨耗面积	0.518^*	0.413^*	0.510^*	0.503^*	0.585^*
上7DB磨耗面积	0.355^*	0.424^*	0.444^*	0.502	0.528^*
上7MP磨耗面积	0.434^*	0.413^*	0.592^*	0.475^*	0.517^*
上7DP磨耗面积	0.368^*	0.414^*	0.453^*	0.464^*	0.514^*
上7MB牙尖斜度	-0.160	0.130	-0.073	-0.038	0.077
上7DB牙尖斜度	0.050	0.043	-0.010	-0.013	-0.004
上7MP牙尖斜度	-0.160^*	-0.198^*	-0.202^*	-0.146	-0.251^*
上7DP牙尖斜度	-0.237^*	-0.148^*	-0.148^*	-0.113	-0.169^*
上7接触面积	0.200^*	0.195	0.066	0.209^*	0.226
上4总磨耗面积	0.245^*	0.292^*	0.322^*	0.224^*	0.347^*
上5总磨耗面积	0.418^*	0.460^*	0.481^*	0.368^*	0.551^*
上7总磨耗面积	0.230^*	0.397^*	0.283^*	0.359^*	0.395^*
年龄	0.317^*	0.304^*	0.335^*	0.256^*	0.574^*

Tab.4

Tab.5

References 34

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牙位	牙尖	磨耗面积/ mm²	牙尖高度/ mm	牙尖斜度/ (°)	咬合接触面积/mm²
上4	B	7.87±3.15	2.46±0.55	39.75±8.18	8.83±5.62
	P	3.96±2.58	1.49±0.48	31.20±8.21
上5	B	5.65±2.87	2.12±0.48	36.09±6.74	8.87±5.76
	P	3.56±2.07	1.40±0.48	29.42±8.84
上6	MB	9.02±4.62	1.57±0.49	25.58±7.05	20.77±13.95
	DB	7.47±3.76	1.61±0.49	27.30±7.20
	MP	12.34±4.79	1.81±0.47	32.64±7.86
	DP	8.55±4.03	1.33±0.48	25.86±7.52
上7	MB	7.82±4.25	1.19±0.48	20.96±6.99	18.73±12.46
	DB	5.39±2.96	1.04±0.50	20.79±7.01
	MP	12.55±5.47	2.08±0.54	35.49±8.61
	DP	4.49±3.12	1.36±0.64	28.99±9.64

性别	人数	磨耗面积/mm²	t	P
男	80	36.97±11.92	1.463	0.145
女	116	34.29±12.41	1.463	0.145

因变量	自变量	非标准化系数		标准化系数	t	P	r²
因变量	自变量	B	标准误	β	t	P	r²
上颌第一磨牙总磨耗面积	年龄	0.525	0.067	0.574	9.359	<0.001	0.329

因变量	自变量	非标准化系数		标准化系数	t	P	r²	VIF	F
因变量	自变量	B	标准误	β	t	P	r²	VIF	F
上6MB磨耗面积	上7MB磨耗面积	0.464	0.066	0.425	7.057	<0.001	0.370	1.098	36.088
	上5B磨耗面积	0.471	0.087	0.326	5.420	<0.001		1.098
上6DB磨耗面积	上7DB磨耗面积	0.203	0.058	0.184	1.208	<0.001	0.374	2.734	29.858
	上5P磨耗面积	0.497	0.105	0.304	6.892	<0.001		1.005
	上7MB磨耗面积	0.157	0.428	0.179	2.224	<0.001		1.005
上6MP磨耗面积	上7MP磨耗面积	0.287	0.068	0.169	4.190	0.002	0.386	1.511	29.726
	上5B磨耗面积	0.419	0.103	0.209	4.089	<0.001		1.220
	上4B牙尖斜度	-0.099	0.030	-0.232	-3.240	<0.001		1.071
	上7DP磨耗面积	0.243	0.105	0.196	2.319	0.001		1.497
上6DP磨耗面积	上7MP磨耗面积	0.173	0.062	-0.226	2.790	<0.001	0.335	1.863	23.839
	上7DP磨耗面积	0.221	0.086	0.187	2.555	<0.001		1.531
	上5B磨耗面积	0.210	0.082	-0.164	2.553	0.006		1.172
	上7MB磨耗面积	0.177	0.073	0.183	2.438	0.016		1.604
上6总磨耗面积	上5磨耗面积	1.564	0.241	0.363	6.539	<0.001	0.457	1.118	82.272
	上7MB磨耗面积	1.579	0.182	0.477	8.576	<0.001		1.118

Study on the correlation between the wear characteristics of maxillary first molars and posterior dentition

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