具有组织终止带的下颌无牙颌印模技术初探

Impression technique with a tissue-stop area for type four edentulous jaws

目的初步确定并验证一种适用于下颌四类无牙颌的印模技术。方法对20名四类无牙颌志愿者分别使用常规印模技术和具有组织终止带的印模技术取下颌印模,对比其将松软组织推开的能力以及相应暂基托的舒适度,随机选用其中一个模型完成总义齿制作,检查并记录总义齿初戴时的组织密合度及患者的复诊次数。结果采用配对t检验显示:两组推开松软组织的能力间差异有统计学意义,舒适度评价差异无统计学意义;采用独立样本t检验显示:两组总义齿组织密合度间差异无统计学意义,复诊次数间差异有统计学意义。结论具有组织终止带的下颌印模技术可以有效地推开松软组织,虽不能提高初戴的舒适性和基托的组织密合度,但是却有效地减少了患者的复诊次数。

Objective This study aims to develop a mandibular impression technique for type four edentulous jaws. Methods Twenty patients with type four edentulous jaws were selected for this study. The mandibular impression for each patient was made using both a traditional impression technique and the impression technique with a tissue-stop area. After the cast was made for each impression, the temporary denture bases were constructed on each cast. When the patients wear temporary denture bases, they must appreciate the degree of comfortability provided by each denture base. Whether the soft tissues that had been pushed away was also recorded. For 10 of the randomly selected patients, a complete denture was made using the traditional impression technique; the remaining ten subjects were given complete dentures constructed by the im- pression technique with a tissue-stop area. The number of times a review for misfit was recorded. The tissue fitness of each denture was also recorded. Results A paired t-test showed that the soft tissues that stacked on the residual ridge were more readily pushed away by the impression technique with a tissue-stop area than by the traditional impression technique. However, for all patients, the degree of comfortability did not vary when different techniques were used. The independent t-test results indicated that the differences between the fitness of dentures constructed using different impression techniques were not signi- ficant. The number of times a review for misfit conducted by the impression technique with a tissue-stop area was considerably lower than that for patients wearing traditionally dentures. Conclusion Using the impression technique with a tissue-stop area can more readily push away the soft tissues packed on the residual ridge and reduce the times of review for misfit compared with using the traditional technique. However, the degree of comfortability and fitness of denture are not improved.