engleski

Assesment of the Precision of Vertical Measurments on Orthopantomographic Radiographs

Objectives: The aim of this study was to evaluate the precision of the horizontal dimensional measurements on orthopantomographic ima- ges by the Orthophos D3200° (Siemens, Germany), and therefore to evaluate their dimensional reliability. Material and Methods: Different distances denoted by metal mar- kers were measured on 25 dry mandibles. The same mandibles were then positioned in an orthopantomographic machine Orthophos D3200Ž (Siemens, Germany) and their radiographic images were made. Mea- surements of the same distances were repeated on the panoramic ima- ges and compared to the results of the measurements on the dry man- dibles. All results were statistically analyzed. Results: The calculated magnification factors for the horizontal me- asurements, not traversing the midline of the mandible, ranged betwe- en 0.97 and 1.065. These values were smaller than those declared by the manufacturer of the X-ray device (1.22x), with a statistically signi- ficant difference between the indices. The calculated magnification fac- tors for the horizontal measurements traversing the midline of the man- dible ranged from 1.45 to 1.85, which was significantly larger than the declared values by the manufacturer of the orthopantomographic mac- hine. Conclusion: Measurements made only on one side of the mandible were very close to actual dimensions of dry mandibles, and therefore representative for those distances. The measurements which extended across the midline of the mandible were greatly enlarged, due to a large magnification factor. Thus, the distances which traverse the midline of mandible should not be measured.

orthopantomography; magnification index

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