Purpose: This study investigated the reliability of visual assessment of marginal gaps in relation to the use of magnification and the operator's profession.
Materials And Methods: A titanium bar was notched, simulating 40 marginal gaps, and 35 operators performed a quantitative evaluation of the incisions.
Results: Visual examination was neither sensitive nor specific, as an extreme variability of data was recorded. The precision of readers improved with magnification aids only for clinicians; technicians were significantly more accurate in evaluating the incision's width.
Conclusion: The visual examinations were inadequate to decide the clinical acceptability of a restoration with regard to its marginal fit.
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