Occlusal plane discrepancies generated by transverse horizontal axis deviations

Statement of problem. Any deviation from the patient's rotational axis of the mandible during closure and the arc of closure on an articulator has been reported to produce occlusal discrepancies. These discrepancies can affect diagnostic planning procedures and the occlusal relationships of res...

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Bibliographic Details
Published inThe Journal of prosthetic dentistry Vol. 86; no. 1; pp. 67 - 73
Main Authors Bowley, John F., Morgano, Steven M.
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.07.2001
Subjects
Computer Simulation
Dental Articulators
Dental Occlusion
Dentistry
Humans
Jaw Relation Record - instrumentation
Jaw Relation Record - methods
Mandible - anatomy & histology
Mandible - physiology
Maxilla - anatomy & histology
Models, Biological
Rotation
Statistics as Topic
Vertical Dimension
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Summary:Statement of problem. Any deviation from the patient's rotational axis of the mandible during closure and the arc of closure on an articulator has been reported to produce occlusal discrepancies. These discrepancies can affect diagnostic planning procedures and the occlusal relationships of restorations. Purpose. This study investigated the magnitude and types of occlusal errors produced by deviations between the patient's transverse horizontal axis and the axle on the articulator. Material and methods. A simplified monoplane model was diagrammatically analyzed for deviations from the model's true transverse horizontal axis. Axis deviations of 5 mm were used in 8 different directions from the true transverse horizontal axis of the model. Changes in the orientation of the mandibular plane to the maxillary plane were illustrated diagrammatically. These changes were quantified by geometric and trigonometric assessments. Results. All axis deviations produced mandibular plane orientation errors with angular plane malalignment to the maxillary plane on complete closure. These axis deviations also produced anterior-posterior shifting of the mandibular plane relative to the maxillary plane. Conclusion. Several different types of planar shifting and angular discrepancies were demonstrated from deviations away from the true transverse horizontal axis. (J Prosthet Dent 2001;86:67-73.)
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0022-3913
1097-6841
DOI:10.1067/mpr.2001.115031