- 期刊
The Influence of Posterior Clinical Crown Loss on the Collagen Fiber Arrangement of the Temporomandibular Joint Disc in Rats
並列摘要
The temporomandibular joint (TMJ) disc plays an important role in the function of the TMJ. The disc consists mainly of collagen fibers whose arrangement in the disc correspond to the function of the disc. Many scientists believe that posterior tooth loss increases TMJ loading. Posterior tooth loss results in reduced joint space, and the condyle, in turn, is displaced, resulting in a change in disc loading. The objective of this research was to evaluate the function of the TMJ disc by means of observing changes in the arrangement of collagen fibers of the disc resulting from a change in disc loading. To mimic posterior tooth loss, the clinical crowns of the bilateral upper posterior teeth in 10 rats were removed, and these animals were used as the experimental group, while another 10 rats with retention of their clinical crowns were designated the control group. Rats in each group were sacrificed after 5 months. Using the modified NaOH method in combination with a cryofracturing method, fibers in both the superficial layer and in the interior of discs were observed with a scanning electron microscope. Collagen fiber arrangements at the surface and in the interior were similar; they were anteroposteriorly oriented in both groups. No significant difference in collagen fiber arrangements in the TMJ discs of the rats could be observed between the control and experimental groups. We concluded that collagen fiber arrangement in the TMJ disc is primarily anteroposteriorly oriented both in the outer and interior layers, but it is not significantly affected by changes in disc loading. This indicates that the role of the disc in TMJ function is mainly to assist condyle movement instead of load bearing.
延伸閱讀
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