A preliminary study and development of the model for analyzing the stress distribution on temporomandibular joint based on the I-Scan system

doi:10.3877/cma.j.issn.1674-1366.2013.05.004

Abstract

Abstract:

Objective

To study the establishment of the model for analyzing stress distribution on temporomandibular joint （TMJ） based on the I-Scan system.

Methods

Three fresh-frozen cadaveric heads with normal occlusion and TMJ were selected through oral examination， CT and MRI， I-Scan system and BOSE force machine was used to analyze the stress distribution of TMJ when it was loaded（107 N， 214 N， 321 N， 12° forward）.

Results

（1）The whole system was constructed and worked well.（2）Under the centric occlusion， the most pressed area was the lateral part of both posterior of the eminence and the anterior of the condylar. （3）As the loading increased， the interface peak pressure of TMJ increases （P＜0.05），except for the upper articular cavity in the left side when it was under the loading 107 N VS 214 N and 214 N VS 321 N （P＞0.05）. （4）when loaded， the interface peak pressure in lower compartment of TMJ is greater than the upper （P＜0.05）. （5）Under the loading， the stress distribution in one side of TMJ is different from the other side （P＜0.05）.

Conclusions

The model based on the fresh-frozen cadaveric head and the I-Scan system could be more intuitive and realistic to analyze the stress distribution in TMJ qualitatively. In the trial condition， the most pressed area of TMJ was the lateral part of both posterior of the eminence and the anterior of the condylar， the buffering of the ice fresh disc make the interface peak pressure different between the upper and lower articular cavity， and the asymmetry of the joint make peak pressure different in the both side of TMJ.

Key words: Temporomandibular joint, Experimental mechanics, Stress distribution, I-Scan system

Zheng CHEN, Zhi-hui MAI, Shao-qin TU, Hong-fei LU, Ling CHEN, Hong AI. A preliminary study and development of the model for analyzing the stress distribution on temporomandibular joint based on the I-Scan system[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2013, 07(05): 362-366.

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Figures/Tables 8

References 11

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加载力值	关节面压力峰值
加载力值	左下腔	左上腔	右下腔	右上腔
107 N	37.97±4.85	24.47±1.32	50.30±3.22	45.20±4.01
214 N	52.90±1.48	32.30±5.80	73.40±5.05	66.30±6.31
321 N	63.70±8.50	39.60±6.55	92.70±4.76	84.80±8.05
P值	0.00	0.03	0.00	0.00

加载力值	关节面压力峰值
加载力值	左下腔	左上腔	右下腔	右上腔
107 N	37.97±4.85	24.47±1.32	50.30±3.22	45.20±4.01
214 N	52.90±1.48	32.30±5.80	73.40±5.05	66.30±6.31
321 N	63.70±8.50	39.60±6.55	92.70±4.76	84.80±8.05
P值	0.00	0.03	0.00	0.00

加载力值	双侧关节下腔				双侧关节上腔
加载力值	左下腔	右下腔	t值	P值	左上腔	右上腔	t值	P值
107 N	37.97±4.85	50.30±3.22	-3.668	0.02^b	24.47±1.32	42.53±2.87	-9.890	0.00^a
214 N	52.86±1.48	73.40±5.05	-6.759	0.00^a	32.30±5.79	59.60±6.10	-5.616	0.00^a
321 N	63.73±8.50	92.73±4.76	-5.155	0.01^a	39.56±6.55	78.13±6.90	-7.022	0.00^a

加载力值	双侧关节下腔				双侧关节上腔
加载力值	左下腔	右下腔	t值	P值	左上腔	右上腔	t值	P值
107 N	37.97±4.85	50.30±3.22	-3.668	0.02^b	24.47±1.32	42.53±2.87	-9.890	0.00^a
214 N	52.86±1.48	73.40±5.05	-6.759	0.00^a	32.30±5.79	59.60±6.10	-5.616	0.00^a
321 N	63.73±8.50	92.73±4.76	-5.155	0.01^a	39.56±6.55	78.13±6.90	-7.022	0.00^a

加载力值	左侧关节				右侧关节
加载力值	左下腔	左上腔	t值	P值	右下腔	右上腔	t值	P值
107 N	37.97±4.85	24.47±1.32	4.652	0.01^a	50.30±3.22	42.53±2.87	3.110	0.04^b
214 N	52.90±1.48	32.30±5.79	5.953	0.00^a	73.40±5.05	59.60±6.10	2.942	0.04^b
321 N	63.70±8.50	39.60±6.55	3.901	0.02^b	92.73±4.76	78.13±6.90	3.021	0.04^b

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