الفهرس 
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Abstract
Thirty hard splints had been made in this study for thirty patients. The patients were divided into three groups (10 patients in each group). group 1, patients received hard splint of 2 mm. thickness. group 2 received hard splint of 4 mm. thickness, while group 3 received hard splint of 6 mm. thickness.
Intra oral adjustments were done to the splints for all patients during delivery of the splints, adjustments were done for centric relation and eccentric positions
For each patient the action potential representing the electrical activity of the right and left masseter and anterior fibres of temporalis muscles was recorded by means of electromyography, to evaluate the effect of the splint thickness on muscle activity, during delivery and after one month of its delivery.
The muscle activity for every patient was measured under three different conditions:
1- During maximum clenching without splint.
2- During chewing gum.
3- During maximum clenching with splint
The patients were recalled again every week during the month for other intra oral adjustments for the splint as muscle spasm had been relieved.
The patients were instructed to wear their splints at night and during the day as possible.
After one month, follow up was done for the patient by taking another record of EMG to evaluate the change in muscle activity over time.
The results revealed statistical significance decrease in the muscle activity of masseter and temporalis muscles with 2mm splint thickness.
Conclusion
Based on the results of the study, it could be concluded that, using of 2mm. splint thickness is better than using 4mm. or 6mm. splint thickness for temporamandibular joint dysfunction patients exhibiting normal vertical dimension of occlusion.