Objectives: This study aimed to investigate masticatory muscle activity in patients treated with 2 modalities of implant mandibular overdenture prosthesis. Methodology: Fourteen completely edentulous male patients were selected and four implants were inserted for each patient. After 3 months of installation, the patients were equally divided into two groups; group I receiving overdentures retained with ball attachments and group II receiving telescopic retained overdentures. Muscle activity was measured at time of denture insertion, two weeks and one month after insertion. Results: The results revealed that muscle activity was significantly lower in telescopic retained overdentures compared to overdentures retained with ball attachments. Conclusion: Telescopic attachments decreased the effort exerted by the muscles compared to ball and socket attachments.
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