The influence of altered occlusion on pro-inflammatory cytokine levels in the TMJ synovial tissues of rats

被引:19
作者
Figueroba, Sidney R. [1 ]
Desjardins, Marina Passarela [1 ]
Ferreira, Luiz E. N. [1 ]
Berta, Luciana A. [1 ]
Valdrighi, Heloisa Cristina [2 ]
Groppo, Francisco C. [1 ]
机构
[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Physiol Sci, BR-13414903 Sao Paulo, Brazil
[2] FHO UNIARARAS, Dept Orthodont, Araras Dent Sch, Sao Paulo, Brazil
关键词
Temporomandibular joint; Cartilage; Endochondral ossification; Dental occlusion; Animal model; Cytokines; FUNCTIONAL POSTERIOR DISPLACEMENT; TEMPOROMANDIBULAR-JOINT; CONDYLAR CARTILAGE; MANDIBULAR CONDYLE; LATERAL SHIFT; EXPRESSION; THICKNESS; PROTEIN; GROWTH; MODEL;
D O I
10.1016/j.archoralbio.2014.07.003
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objective: The aim of this study was to evaluate whether altered occlusion affects both the condylar cartilage thickness and the cytokine levels of the TMJs of rats. Design: Thirty adult-male rats (n = 30) were randomly assigned to three experimental conditions: a control group that underwent sham operations with unaltered occlusion; an FPDM group that underwent functional posterior displacement of the mandible that was induced by an incisor guiding appliance; and an iOVD group in which the increased occlusal vertical dimension was induced in the molars. The rats were subjected to the FPDM or iOVD model for 14 days and then killed. Both the right and left TMJs were removed and randomly assigned to examination with staining or immunoassay techniques. Toluidine blue staining was used to measure the thicknesses of the four layers of the articular cartilage (i.e., the fibrous, proliferating, mature, and hypertrophic layers). ELISA assays were used to assess the concentrations of the pro-inflammatory cytokines IL-1 alpha, IL-1 beta, IL-6, and tumour necrosis factor (TNF-alpha). The measurements of the articular cartilage layers and cytoldne concentrations were analyzed with ANOVA and Tukey's tests and Kruskal-Wallis and Dunn tests, respectively (alpha = 5%). Results: The thickness of articular cartilage in the FPDM group (0.3 +/- 0.03 mm) was significantly greater than those of the control (0.2 +/- 0.01 mm) and iOVD (0.25 +/- 0.03 mm) groups. No significant difference was observed between the control and iOVD groups. The four articular cartilage layers were thicker in the FPDM group than in the control and iOVD groups, and the latter two groups did not differ one from each other. Both the FPDM and iOVD groups exhibited higher cytoldne levels than did the control (p < 0.05) group. Compared to the FPDM group, the iOVD group exhibited significantly higher levels of IL-1 beta and TNF-alpha. Conclusion: Both models induced inflammation in the TMJ and caused significant structural changes in the TMJ and surrounding tissues. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1164 / 1171
页数:8
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