Evaluation and analysis of facial somatosensory changes of chronic masticatory muscle pain patients with quantitative sensory testing / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate and analysis facial somatosensory changes of patients with chronic masticatory muscle pain (MMP) quantitatively.</p><p><b>METHODS</b>The seven parameters of standardized quantitative sensory testing (QST) protocol were used to test the pain sites, contralateral sites of masticatory muscles of 20 chronic MMP patients and the same sites of right masticatory muscles of 20 matched healthy controls. QST thresholds were compared within groups using paired t test and between groups using unpaired t test.</p><p><b>RESULTS</b>Compared to the controls, all seven parameters of bilateral sides of patients had changed. Mainly cold detection thresholds [(-1.2±0.5) and (-1.7±0.9) °C] and cold pain thresholds [(27.6±2.3) and (27.0±2.0) °C] of pain and contralateral sides increased significantly, while warm detection thresholds [(2.0±1.1) and (2.1±1.2) °C], heat pain thresholds [(37.9±3.2) and (39.7±3.9) °C], and mechanical pain thresholds [(49.3±34.1) and (111.8±86.3) mN] of pain and contralateral sides decreased significantly (P<0.05). Mechanical detection thresholds of pain sites [(1.8±1.4) mN] significantly increased (P=0.01).</p><p><b>CONCLUSIONS</b>Chronic MMP patients were detected thermal hyperesthesia, thermal hyperalgesia, and mechanical hyperalgesia. Mechanical hypoesthesia was found at the pain sites of masticatory muscles. Chronic MMP might influence the central modulation of trigeminal nerve system.</p>

Study on prediction of involvement in facial nerve in the patients with parotid tumors by using facial electroneurography / 北京大学学报(医学版)

Objective:To investigate the possibility of predicting facial nerve involvement in the pa-tients with parotid tumors using facial electroneurography (ENoG).Methods:In the study, 53 patients with primary parotid tumors were included in the study , 28 were benign tumors and 25 were malignant . There was no significant difference of tumor locations and sizes between the two groups . House-Brackmann facial nerve function evaluation was gradeⅠin all the patients who received examination of fa-cial electroneurography , including stimulation strength , amplitude , and latent time bilaterally .The facial electroneurography results in the affected side were compared with the results of contralateral normal side , intraoperative appearance and postoperative histopathological diagnosis .The facial electroneurography results were analyzed by Wilcoxon signed rank test and receiver operator characteristic ( ROC) curve. Results:During the facial electroneurography examination , the mean stimulation strength in the patients with benign parotid tumor was 20.0 mA.There was significant decrease in the amplitude at the affected side compared with the normal side upon posterior auricular stimulation ( P0.05).However, in the patients with malignant parotid tumor , the mean stimulation strength was higher at 24.5 mA.There was signifi-cant decrease in the amplitude or even no response at the affected side compared to the normal side upon posterior auricular stimulation ( P<0 .05 ) .No response was detected in the multiple branches of facial nerve of affected sides in 36 .0%patients upon posterior auricular stimulation .The amplitude of branchesⅢand Ⅳwas significantly lower at the affected side than that at the normal side upon anterior auricular stimulation (P<0.05).The area under the ROC curve for ENoG was 0.884.Conclusion: When the facial nerve was involved by the parotid tumors , the stimulation strength in the electroneurography was larger .There was significant difference in the amplitude and the latent time of the facial nerve between the affected side and the normal side upon the posterior auricular stimulation .The rate of absence of reac-tion wave was higher in the patients with malignant tumors .It was feasible to predict the facial nerve in-volvement by ENoG for the parotid gland tumor patients without clinical appearances of facial paralysis .

Masticatory performance and assessment of life quality of children with ectodermal dysplasia after prosthetic rehabilitation / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate masticatory performance and life quality of children with ectodermal dysplasia (ED) after prosthetic rehabilitation.</p><p><b>METHODS</b>Six children with ED received denture restoration and 18 healthy children were involved in this study. The surface electromyography (EMG) of masseter (MM) and anterior temporalis (TA) during clenching and chewing movement were recorded. The EMG amplitude, area, asymmetry index of total and activity index of MM/TA were compared at each stage. The masticatory efficiency was measured with spectrophotometer. The life quality was assessed using visual analogue scale questionnaire.</p><p><b>RESULTS</b>The EMG amplitude of MM and TA during chewing in ED Group were 41.7% and 45.6% of the control group respectively, the area were 35.9% and 36.0% respectively. Significant difference in asymmetry index of total during clenching was observed between the two groups (P < 0.05) but not during chewing (P > 0.05). The differences of activity index of MM/TA during clenching and chewing between the two groups were not detected (P > 0.05). The masticatory efficiency of ED group was 67.2% of the control group. The score of chewing function in children with ED after prosthetic rehabilitation was three times higher than before, and no difference was present between the two groups (P > 0.05).</p><p><b>CONCLUSIONS</b>Early prosthetic rehabilitation can significantly improve the masticatory performance and life quality of children with ED.</p>