Chewing efficiency and electromyographic activity of masseter muscle with three designs of implant-supported mandibular overdentures. A cross-over study
ANN ARBOR—A common test used to determine mercury exposure from
dental amalgam fillings may significantly overestimate the amount of the
toxic metal released from fillings, according to University of Michigan
researchers.
, , , , . Chewing
efficiency and electromyographic activity of masseter muscle with three
designs of implant-supported mandibular overdentures. A cross-over
study. Clin. Oral Impl. Res. 00, 2013; 1–7.
Abstract
Purpose
The
aim of this study was to compare the effect of three designs for
implant-supported mandibular overdenture on the chewing efficiency and
electromyographic (EMG) activity of masseter muscles.
Material and methods
Eighteen
edentulous patients received new maxillary and mandibular dentures
(control, CD) before implant placement. After using the dentures for
3 months, patients were randomly divided into six blocks (three
patients/block) and received four implants in canine and first molar
areas of the mandible. Following osseointegration period, new duplicate
mandibular overdentures were successively connected to the implants
with: (i) ball attachment on two implants (2BOD), (ii) bar attachment on
two implants (2ROD), and (iii) bar attachments on four implants (4ROD)
in a random order. Chewing efficiency was measured using chewing gum,
and EMG was recorded during clenching (with or without food).
Evaluations were made 3 months after using each of the following
prostheses: CD, 2BOD, 2ROD, and 4ROD.
Results
All
implant-supported overdentures showed a significant increase in chewing
efficiency and EMG values when compared to CD. These values increased
significantly with 4ROD when compared to 2BOD or 2ROD prostheses. There
was no significant difference in chewing efficiency and EMG between 2BOD
and 2ROD prostheses.
Conclusion
Four-implant-supported
overdentures seem to present a functional advantage vs.
two-implant-supported overdentures, independent of the chosen attachment
system.
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