The mandible is able to move in a complex fashion, with variable combinations of both translation and rotation in three dimensions (six degrees of freedom), at any given time during function.
Research into the process of accurately capturing three-dimensional functional movement of the mandible has many broad clinical applications in dentistry and medicine alike. Anatomical kinematics of the craniofacial skeleton that includes motion analysis has potential scope for clinicians in the areas of diagnostics, treatment planning and treatment outcome assessment.
The aims of this study were to describe mandibular motion during opening-closing tasks of two adult subjects and one growing subject with a Class II malocclusion, undergoing growth modification with a Clark Twin Block appliance. Motion analysis recordings were taken with the use of a twelve-camera motion analysis system (Motion Analysis Corporation). The values of the kinematic variables (translation [millimeters] and rotation [degrees]) of mandibular opening-closing that were obtained were consistent and repeatable for both adult subjects throughout this study. In contrast, those values obtained from the subject who wore a functional appliance show noticeable changes in the motion patterning during the initial stages (recordings taken at four and at eight weeks) of appliance wear. These are most apparent in the translation data recorded along the anterior-posterior axis. Mandibular motion however, seemed to return to near pre-treatment patterning in this individual following one year following the initiation of the appliance wear. These observations were seen in one experimental individual. Further research is needed to elucidate whether such changes in motion patterning are seen normally in the growing individual, or, are accountable due to the clinical intervention with an orthodontic appliance.
This study piloted the use of two different splint designs for the purposes of recording mandibular motion in the two adult subjects. There were no significant differences in the recording of mandibular motion between the two different splint designs. One design has been recommended for future studies due to its overall ease of fabrication and intra-oral comfort for the subjects.
| Identifer | oai:union.ndltd.org:ADTP/217771 |
| Date | January 2007 |
| Creators | O'Shea, Catherine Laurance, n/a |
| Publisher | University of Otago. School of Dentistry |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Rights | http://policy01.otago.ac.nz/policies/FMPro?-db=policies.fm&-format=viewpolicy.html&-lay=viewpolicy&-sortfield=Title&Type=Academic&-recid=33025&-find), Copyright Catherine Laurance O'Shea |
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