Effect of head positioning in panoramic radiography on vertical measurements: an in vitro study
| Autor: | A Ainamo, M Gong, K. Soikkonen, Keijo Mattila, Qiufei Xie, Juhani Wolf |
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| Rok vydání: | 1996 |
| Předmět: |
Cephalometry
Radiography Mandibular first molar 030218 nuclear medicine & medical imaging Mental foramen 03 medical and health sciences 0302 clinical medicine stomatognathic system Reference Values Radiography Panoramic medicine Premolar Humans Radiology Nuclear Medicine and imaging General Dentistry Analysis of Variance business.industry Dental Implantation Endosseous Mandible Reproducibility of Results Vertical Dimension 030206 dentistry General Medicine Anatomy Sagittal plane Skull medicine.anatomical_structure Jaw Otorhinolaryngology Maxilla Linear Models business Geology |
| Zdroj: | Dentomaxillofacial Radiology. 25:61-66 |
| ISSN: | 1476-542X 0250-832X |
| Popis: | To assess whether it is possible to make accurate vertical measurements of the jaws from panoramic radiographs.Five dry skulls were shifted 5 mm forwards and backwards and tilted 5 degrees up and down in the sagittal plane. Panoramic radiographs of each skull were obtained in nine different positions. In the maxilla, three reference lines were used and vertical measurements were made at the distal surfaces of the first premolar and first molar and in the midline. In the mandible, measurements were made at the distal surfaces of the first premolar and first molar, and at the mental foramen on both sides, and in the midline. The points and lines were marked manually and the radiographs were digitized, magnified and measured.Sagittal shifting and tilting had only a slight effect on measurements in the mandible. Sagittal tilting of the head had the greatest effect on all the measurements made from the line between the articular eminences to the alveolar crest, as well as measurements in the maxillary midline.The line between the articular eminences is unsuitable as a reference line for measurements of the tooth-bearing areas. A slight misalignment of the head does not significantly affect the vertical measurements in the mandible or of the posterior maxilla if the reference lines are in the same vertical plane as the teeth. |
| Databáze: | OpenAIRE |
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