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Abstract：
Introduction Lower third molar impaction surgery is one of the most common minor oral surgical procedures done. Trismus has been one of the most common and disturbing postoperative sequelae for patients. The study aimed to evaluate the electrical activity of the masseter and temporalis muscles after mandibular third molar surgery. Materials and methods The research was conducted at Saveetha Dental College and hospitals in the Department of Oral and Maxillofacial Surgery. The study consisted of 20 individuals. The EMG (electromyography) activities of both masseter muscles in each patient were measured before the tooth extraction surgery, postoperatively after 72 hours, and after seven days. The inter-incisal distance was also measured at similar follow-up intervals. Data were analyzed using IBM Corp. Released 2015. IBM SPSS Statistics for Windows, Version 23.0. Armonk, NY: IBM Corp., with p-values less than 0.05 considered statistically significant. The Mann-Whitney U test was used for the comparison of electrical activity between masseter and temporalis on both the operated and non-operated sides during preoperative, postoperative, 72-hour, and postoperative seven-day periods. Results It has been found that the electrical activity of the temporalis is higher than that of the masseter muscle measured at all the intervals of the follow-up period, with statistically significant values (p=0.001). It was noted that all the patients have reduced mouth opening when compared with preoperative (mean mouth opening = 45.6 mm), postoperative 72 hours (mean mouth opening = 31.2 mm), and postoperative seven days (mean mouth opening =35.6 mm). When a comparison was done between temporalis and masseter, the masseter took longer to return to pre-operative electrical activity, which might also imply that for prolonged trismus seen in patients after lower third molar surgery, it is the masseter that is affected and needs recovery for trismus to be resolved. Conclusion Based on the results obtained, it can be concluded that there was a reduction in the electrical activity of both the masseter and temporalis post-third molar impaction surgery. It was also found that there was a reduction in mouth opening in patients who underwent lower third molar extraction surgery. Masseter muscle took longer to return to its preoperative electrical activity than temporalis muscle, implying that targeted therapies to accelerate the healing of masseter muscle may prevent prolonged trismus in patients who undergo lower third molar impaction surgery.
摘要：
介绍下第三磨牙嵌塞手术是最常见的小型口腔外科手术之一。对于患者来说，剑术是最常见和最令人不安的术后后遗症之一。该研究旨在评估下颌第三磨牙手术后咬肌和颞肌的电活动。材料和方法该研究在Saveetha牙科学院和口腔颌面外科的医院进行。该研究由20个人组成。在拔牙手术之前测量每位患者的两个咬肌的EMG（肌电图）活动，术后72小时，七天后。还以相似的随访间隔测量了切面间距离。使用IBM公司分析数据2015年发布IBMSPSSStatisticsforWindows,版本23.0。Armonk,纽约：IBM公司,p值小于0.05被认为具有统计学意义。Mann-WhitneyU检验用于术前手术和非手术侧咬肌和颞肌之间的电活动比较，术后,72小时,和术后七天。结果发现，在随访期间的所有间隔内测得的颞肌的电活动均高于咬肌的电活动，具有统计学显著值(p=0.001)。值得注意的是，与术前相比，所有患者的张口都减少了（平均张口=45.6mm），术后72小时（平均张口=31.2mm），和术后7天（平均张口=35.6mm）。当在颞肌和咬肌之间进行比较时，咬肌需要更长的时间才能恢复到术前的电活动，这也可能意味着，对于下第三磨牙手术后的患者，受影响的是咬肌，需要恢复才能解决刺耳。结论根据获得的结果，可以得出结论，在第三磨牙嵌塞手术后，咬肌和颞肌的电活动均减少。还发现，接受下第三磨牙拔除手术的患者的张口减少。咬肌比颞肌需要更长的时间来恢复其术前电活动，这意味着，在接受下第三磨牙嵌塞手术的患者中，加速咬肌愈合的靶向治疗可能会防止长期的三联肌。
