Long-term Effects of Unilateral Anterior Crossbite on the Pressure Pain Threshold of Rats Masseters.

Abstract

Abstract: Objective: To explore the pressure pain threshold(PPT) changes of masseters induced by the unilateral anterior crossbite (UAC) prosthesison rats. Methods: UAC model was set up with metal tubes on rats which were sacrificed at weeks 4,12,16,20. And then the PPTof ipsilateral masseters of the 20w groups were observed at day1, 3, 5, 7 and week 2,4,8,12,16,20 after UAC, while the PPT of ipsilateral masseters of the 4w,12w and 16w groups were observed at day1, 3, 5, 7 and the day they were sacrificed. Resules: The UAC leaded to decreased PPT (P<0.05). And the decreased PPT was significant from the day1, and peaked at day3 after UAC. Then the value of PPT increased gradually at day5 and day7, and there was no significant difference between the control group and the UAC group from week 2 to weeks 20. The PPTs of the 20w group at 4 weeks,12 weeks and 16weeks had no significant differences with the 4w group, the 12w group and the 16w group respectively. And at the same time, there was no significant difference of PPTs between the female and male rats significantly. Conclusion: The unilateral anterior crossbite can induce the acute, short-term and restorable decrease of PPT of ipsilaterl masseters of rats.

Key words: Temporomandibular joint , Masseter , Pressure pain threshold

CLC Number:

R782.6

LIAO Li-fan, JIN Lei, ZHANG Hong-yun, et al.. Long-term Effects of Unilateral Anterior Crossbite on the Pressure Pain Threshold of Rats Masseters.[J]. Journal of Oral Science Research, 2015, 31(3): 217-219.

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