Publication

Authors: Marzieh Alikhasi, Hakimeh Siadat, Saeed Mehraban Hassani, Elaheh Tabatabaee
Regeneration, Reconstruction & Restoration, Vol.1, No.1, 2016,Page

Introduction: Radiographs are commonly used to detect misfit of implant components, but various factors including implant connection and
component opacity could affect this decision. The purpose of this study was to evaluate the diagnostic capability of senior students and
experienced dentists on the adaptation of implant and impression coping in different vertical and horizontal angled radiographs. Materials and
Methods: The implant and the impression coping were attached to each other; once without any gap and once with a gap of 0.5 mm. Totally,
40 digital X-rays were taken with vertical inclinations of 0, 5, 10, 15, 20, 25, 30 degrees in positive and negative directions, and the rest were
horizontally inclined with the same values. Forty senior students and twenty experienced dentists observed the radiographs. Their diagnoses
were compared with the real status of components. Results: No significant difference was observed between the performance of students and
experts (P=0.74). Statistical t-test analysis revealed that the directions (inclinations toward the implants or the impression copings) does not
result in any significant difference in diagnoses of students (P=0.29) and dentists (P= 0.15). Nevertheless, general linear model showed the
radiograph angulations had a significant impact on the diagnoses of students (P=0.003) and dentists (P<.001). Youden factor revealed that there
was not a consistent trend regarding sensitivity and specificity of vertically angled radiographs; however, sensitivity and in particular, specificity
decreased as a result of horizontal angle inclination. Conclusion: Increasing vertical angulations of the radiographs for diagnosing the
adaptation of implant components is likely to reduce diagnostic capability of clinicians, even experienced ones. Specificity is more affected than
sensitivity in both horizontally and vertically angled radiographs.