Characteristics and surgical treatment for differentiated thyroid carcinoma with recurrent laryngeal nerve involvement at the entrance of larynx / 中华普通外科杂志

Objecfive:To investigate the clinical characteristics and surgical management of tumor invasion on recurrent laryngeal nerve at the entrance of larynx in thyroid cancer.Methods:The clinical data of 30 patients with recurrent laryngeal nerve invasion by thyroid cancer from Aug 2012 to Aug 2018 in Cangzhou Central Hospital were analyzed retrospectively. Patients were divided into groups A (14 cases ,nerve was invaded at the larynx) and group B (16 cases,nerve was involved in other parts).Results:Between the two groups, operation time, intraoperative blood loss, number of tumor focus, adhesion and infiltration were not statistically different ( P>0.05). The tumor size in group A was smaller ( t=-3.614, P=0.001), the lymph node metastasis rate was lower ( χ2=5.593, P=0.018), and the microcancer rate was higher ( χ2=4.051, P=0.044).Follow up data up to 24 months showed there were no significant difference in postoperative hoarseness , laryngoscope abnormality and recurrence rate between the two groups (all P>0.05). Conclusion:Patients of thyroid cancer with recurrent laryngeal nerve invasion at the larynx had relatively small tumor size, higher proportion of microcancer, lower rate of lymph node metastasiss.

The influence of autoclave sterilization on elastic module and flexural strength of five types of posts / 西安交通大学学报(医学版)

Objective To research the influence of autoclave sterilization on elastic module and flexural strength of five types of posts.Methods Shidelong carbon,glass and quartz fiber post,tenax glass fiber post and Anthogyr titanium post were chosen,and all the samples were divided into two groups which included five subgroups according to the model of posts,each subgroup including six samples.Experimental groups were autoclave sterilized(50 min at 134℃ and 2.2MPa),While the control groups were not.With three point loading system,elastic module and flexural strength of all the samples were measured.Results were statistically analyzed to find the difference between them.Results There was no statistical difference between Shidelong carbon,glass,quartz fiber post and Tenax glass fiber post in elastic module and flexural strength in both experimental group and control group,while Anthogyr titanium post gained the highest elastic module and flexural strength.Paired-samples t test also showed there was no statistical difference between experimental group and control group in elastic module and flexural strength.Conclusion Fiber posts perfectly meet the need of clinical use on flexural strength.Furthermore,with elastic module similar to dentin and much lower than metal posts,fiber posts will help to protect the remaining tooth structure from fracture.Autoclave sterilization has a little influence on elastic module and flexural strength of posts,which allows practitioners to systematically sterilize the posts in clinic.