الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
SUMMARY
Fourteen patients were selected from among those attending the out-patient clinic, Prosthodontic Department, Faculty of Dentistry, Ain Shams University to participate in this study .Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study.
Patients were divided into two groups:.
Group A: Patients were rehabilitated by tooth retained mandibular overdenture
Group B: Patients were rehabilitated by mini- implant retained mandibular overdenture
In group A, patients have two restorable canines having adequate bone support were only the remaining natural teeth in the lower ridge. The two canines were endodontically treated before being prepared into dome shaped design to receive ball attachment. Lower complete overdenture was constructed for each patient opposed by conventional maxillary denture.
In group B, Surgical installation of the implant was performed under strict aseptic conditions and delayed loading protocol was followed.
The EMG activity of masseter and temporalis muscles was recorded for each patient during chewing soft and hard food 2weeks, 6 months & 12 months after denture insertion.
Surface electrodes were repositioned at the same elctrode sites using a face transparent template constructed for each patient at the end of the 1st electromyographic record. The 2nd & 3rd electromyographic record was done with the same procedures and under the same circumstances of the 1st record. Data obtained from the electromyographic evaluation of the 2 masticatory muscles (masseter and temporalis) were collected, arranged, tabulated and statistically analyzed.
The results of this study revealed statistical significant increase in muscle activity of both masseter & temporalis muscles for group A (patients rehabilitated with mandibular tooth retained overdenture) through the follow period while showed statistical insignificant increase in muscle activity of both masster & temporalis muscles for group B (patients rehabilitated with mandibular mini-implant retained overdenture). The results showed also that for group A , muscle activity of both masseter & temporalis during chewing hard food was higher than during chewing soft food with statistical significant difference while for group B ,muscle activity of both masseter & temporalis during chewing hard food was higher than during chewing soft food with statistical insignificant difference.