Influence of patient head positioning on measured axial tooth inclination in panoramic radiography
- 1 June 2009
- journal article
- research article
- Published by Informa UK Limited in Journal of Orthodontics
- Vol. 36 (2), 103-110
- https://doi.org/10.1179/14653120723013
Abstract
Panoramic radiographs are routinely used to assess the mesiodistal axial inclination of teeth (MDAI) in orthodontic treatment. These radiographs are sensitive to minor deviations from standard head position that result in image distortions. The aim of this study is to measure and quantify the changes in MDAI on panoramic radiograph resulting from changes in patient head position. The testing devise was a human skull with guide wires placed on the facial surface of the teeth and alveolar process along the long axis of each tooth. Panoramic radiographs were captured digitally with the orientation of the skull in Frankfurt horizontal plane parallel to the floor and with 1 degrees , 2 degrees , 5 degrees , 7 degrees , and 10 degrees both superior and inferior rotations. The mesiodistal tooth angulations were determined using MIPAC software (DentalEye and LEAD Technologies, Inc. 2005). The more distal the position of the tooth in the arch the greater the change in MDAI with a change in vertical head position. A maximum change of approximately 10 degrees was observed in MDAI of both the maxillary and mandibular molars with a corresponding superior head tilt of 10 degrees. The Mandibular anteriors displayed significant inconsistencies in MDAI with both superior and inferior head tilt. A superior head tilt produced a greater change in mesiodistal angulation than did an inferior head tilt. Accurately taken panoramic radiographs can serve as a convenient tool for evaluating the MDAI before, during and after orthodontic treatment. Additional radiographs are recommended for the mandibular anteriors.Keywords
This publication has 20 references indexed in Scilit:
- The accuracy of 4 panoramic units in the projection of mesiodistal tooth angulationsAmerican Journal of Orthodontics and Dentofacial Orthopedics, 2002
- Suitability of the panoramic radiograph for assessment of mesiodistal angulation of teeth in the buccal segments of the mandibleAmerican Journal of Orthodontics and Dentofacial Orthopedics, 1988
- Long-term effect of root proximity on periodontal health after orthodontic treatmentAmerican Journal of Orthodontics and Dentofacial Orthopedics, 1987
- A statistical correlation of individual tooth size distortions on the orthopantomographic radiographAmerican Journal of Orthodontics, 1979
- Functionally optimal occlusion: The goal of orthodontic treatmentAmerican Journal of Orthodontics, 1976
- The six keys to normal occlusionAmerican Journal of Orthodontics, 1972
- Arrangement in the Jaws of the Roots of the TeethThe Journal of the American Dental Association, 1963
- Clinical observations on the axial inclination of teethAmerican Journal of Orthodontics, 1949
- A New Tomographical Method for Radiographing Curved Outer SurfacesActa Radiologica, 1949
- The limitations of orthodontic treatment. II. Diagnosis and treatment in the permanent dentitionAmerican Journal of Orthodontics and Oral Surgery, 1947