Milled premolar crown margin defect detection using multiple vertical x-ray angulations

Abstract

ObjectiveTo compare the effects of different vertical x-ray angulations during radiographic imaging on the ability to detect marginal discrepancies of lithium disilicate crowns. Study DesignSeven lithium disilicate crowns were fabricated on a premolar. Discrepancies ranging from 0 to 300 µm were intentionally created. The seated crowns were imaged using seven different vertical x-ray angulations, totaling 49 images. Thirty evaluators scored each image for marginal discrepancy and values were statistically analyzed. ResultsSignificant differences in the ability to accurately judge marginal discrepancies were observed for the study factors of vertical x-ray angulation and marginal discrepancy size (P < 0.001). ConclusionThe radiographic interpretation of the marginal discrepancies of lithium disilicate crowns are significantly affected by vertical x-ray angulation and size of the margin discrepancy. Statement of Ethical ReviewEthical review was sought and study was exempted from ethical review.