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Mandible protrusion and decrease of TMJ sounds: an electrovibratographic examination
Alicio Rosalino Garcia1, Sérgio Folli, Paulo Renato Junqueira Zuim
1Department of Dental Materials and Prostheses, School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil. argarcia@foa.unesp.br
Brazilian Dental Journal
|April 29, 2008
Summary
Mandibular protrusion using an anterior positioning appliance can significantly reduce temporomandibular joint (TMJ) vibratory energy. A minimum of 3 mm protrusion is key for diagnosing and recapturing anteriorly displaced discs.
Area of Science:
- Biomedical Engineering
- Orthodontics
- Diagnostic Imaging
Background:
- Temporomandibular joint (TMJ) disorders, particularly anterior disc displacement with reduction, often present with clicking.
- Electrovibratography offers a quantitative method to assess TMJ dynamics.
Purpose of the Study:
- To determine the minimum mandibular protrusion needed to significantly decrease TMJ vibratory energy.
- To evaluate the efficacy of electrovibratography as an aid in diagnosing the recapture of anteriorly displaced discs.
Main Methods:
- Eighteen patients with diagnosed anterior disc displacement underwent electrovibratography.
- Mandibular protrusion was incrementally adjusted from 1 to 5 mm using an anterior positioning appliance.
- Vibratory energy was measured at each protrusion level, with baseline data serving as control.
Main Results:
- Elevated vibratory energy intensities were observed in the middle and late phases of mouth opening at baseline.
- Significant reduction in TMJ vibratory energy was achieved with mandibular protrusion.
- Only 2 patients exhibited vibration (0.6-2.8 Hz) after 5 mm of protrusion.
Conclusions:
- A minimum of 3 mm mandibular protrusion is sufficient to significantly decrease TMJ vibratory energy.
- This level of protrusion aids in the diagnosis of recapturing an anteriorly displaced articular disc.
- Electrovibratography combined with anterior positioning shows promise for TMJ disorder assessment.
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