间接创伤对幼年大白鼠颞下颌关节血供的影响

目的　探讨间接创伤对幼年鼠颞下颌关节的影响。方法　Wistar幼年大白鼠颞下颌关节间接创伤后,应用放射性同位素测定方法对其关节区进行动态观察。结果　与正常组比较,随着创伤后对颞下颌关节区不同时间段同位素测定,创伤后颞下颌关节区放射性强度随时间增加,两周达高峰,1月时放射性强度仍比正常对照组高,在任何时间段,创伤侧都较非创伤侧颞下颌关节区放射性强度高。结论　间接创伤可以引起幼年鼠颞下颌关节局部血流变化

THE EFFECT OF INDIRECT TRAUMA ON YOUNG RAT IN THE BLOOD FLOW OF TMJ

Objective Trauma to the chin may cause injury to the articular tissues, resulting in condylar fractures and traumatic arthritis, Ankylosis, fibrous adhesions, and limitation or deviation of jaw opening can occur subsequently to trauma experimental investigations on the temporomandibular joint(TMJ) have primarily dealt with surgical procedures. No studies, however, are available in which the effect of indirect trauma to the TMJ has been examined in experimental young animals. The aim of this study was to evaluate the effect of indirect trauma in the blood flow of temporomandibular joint(TMJ).Methods The study material comprised 30 young rat weighing 80-100g. all animals werre fed a diet of rodent feed. The animals were divided into 5 groips, with 6 rats in each. The rats were killed after 0h,1 week, 2 weeks,1 month. Trauma to the TMJ was achieved under anesthesia and consisted of impact to the left mandibular angle with the animal placed in dorsal decubitus. The right TMJ was used as a control. The striking force was applied to the mandibular angle in order to avoid the fibrous symphyseal junction of the rat mandible. The resulting impact, applied from an angle glenoid fossa direction, caused injury to the TMJ. The radioactive nuclide was performed on these at different time.Results After the traumatic impact, the animals ate without difficulty and continued to gain weight. None showed any obvious limitation in mouth opening. The value of radioactive count ratio change is higher on the trauma TMJ than the control TMJ at all different time. Indirect trauma of young rat can lead to more TMJ blood flow. None of the control sites showed changes in the articular tissues. Conclusion The present study has shown that indirect trauma to the TMJ of young rats resulted in injury to the articular surfaces. These injures were produced by making use of the collum principle, i.e, the mandibular ramus and condylar process segment are viewed as a compact collum, capable of receiving and transmitting forces. Indirect trauma can lead to changes of blood flow perfusion to TMJ of young rat.