الفهرس 
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Abstract
Aim: The aim of this randomized controlled study is the evaluation of electromyographic activity of masseter muscle with three different attachments (ball, bar and locator attachments) used to stabilize mandibular two-implant retained overdentures. Materials and Methods: Twelve participants with atrophied mandibles and persistent denture problems received new maxillary and mandibular conventional dentures (control, CD). After 3 months of adaptation, two implants were inserted in canine region of the mandible. In a quasirandom method, overdentures were connected to the implants with either ball overdenture(BOD), bar overdentures (ROD) or locator overdentures (LOD). Electromyogram was recorded by using surface electrodes to monitor the activity of masseter muscle during chewing hard and soft food. Recording of muscle activity was performed 3 months after using each of the following prostheses: CD, BOD ,Rod and LOD. Results: Muscle activity increased significantly with BOD followed by ROD and LOD compared to CD, while chewing soft food. No significant difference appeared with hard food. Also, BOD was higher in results in most of parameters. -Conclusion: ball and socket attachment is recommended to retain 2-implant retained mandibular overdentures than bar and locator attachments as it was associated with increased EMG activity, increased chewng area, reduced duration of chewing rate, and increased durations of chewing cycle and chewing bursts.