Abstract
The masticatory function and the adaptation of patient's denture with Brånemark implant in the edentulous mandible was evaluated by using electromyography for 6 years. Electromyograms (EMG) of the bilateral posterior temporal and masseter muscles during gum chewing were recorded at insertion of the old full denture and at 1 month, 3 months, 6 months, 2 years and 6 years after insertion of implant denture. The interval, the duration and their integrated values of EMG bursts were measured.The duration of EMG burst was shorter with the implant denture than with the old full denture and became about 300 msec from 3 months after insertion of the implant denture. The coefficient of variance (CV) of duration became stable from 3 or 6 months after insertion of the implant denture.The EMG power coordination pattern was converted into a normal one representing the prominence of the working side masseter followed by the other three muscles after insertion of the implant denture.The periotest values of the implant fixture were not significantly changed after insertion of the implant denture, and osseointegration has been maintained.These results suggested that adaptation to the implant denture might require a longer period than that to the conventional denture.
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