الفهرس 
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Abstract
The study aimed to evaluate the regional nerve block efficacy in the treatment of myofascial pain of masseteric origin.
This study was done on 30 healthy patients which randomly selected from outpatient clinic of oral and maxillofacial surgery department, faculty of dentistry, Suez Canal University. The patients were randomly divided into two equal groups, fifteen patients each, group A consisted of 15 patients who injected by local anesthesia at the masseteric nerve (nerve block). group B consisted of 15 patients who injected by local anesthesia at trigger points in the masseter muscle.
Standard pain scoring was obtained from all patients who were instructed to mark on visual analogue scale VAS which ranged from 0 score for no pain to 10 score for the severe pain experienced at all three points: baseline, at 30 minutes ,2 weeks post-treatment and 8 weeks post-treatment.
The maximal mouth opening (MMO) was measured from incisal edge of upper central incisors to incisal edge of lower central incisors by mm. ruler at each time point: baseline, at 30 minutes, 2 weeks post-treatment and 8 weeks post-treatment.
Masseter muscle Palpation was performed with palmer surface of the middle finger of operator who faces the patient to observe the patient’s eyes and facial expression during palpation technique at each time point: baseline, at 30 minutes, 2 weeks post-treatment and 8 weeks post-treatment.
The present study showed that Comparison between VAS for pain severity at all time intervals in both group indicated that the groups were similar at baseline (T1) and (T2) time intervals without significant difference (p>0.05). After intervention at T3 time interval a significant reduction in group A of mean VAS compared to group B (p<0.05). At the rest of follow up sessions (T3, T4), there were statistically insignificant differences between two groups (p>0.05).
Comparison between MMO at different assessment sessions in both groups showed that the groups were similar at T1 and T2 time intervals without significant difference (p>0.05). After intervention at T3 time interval, group B showed significantly higher mean MMO compared to group A (p<0.05). At the rest of follow-up intervals (T4), there were statistically insignificant differences between both groups (p>0.05).