The purpose of expert reports is to support the judge in his decisions, by providing technical information. However, it remains uncertain as to what extent the content of these reports is used, and if they are effectively associated with judicial decisions. The aim of this study was to perform a qualitative analysis of case reports in relation to the judicial decisions rendered in association with these reports, by determining the connection between causal nexus and aspects of fault. The case reports included lawsuits against dentists, issued by the Medical Justice Department of the State Court of Appeals of Rio Grande do Sul, Brazil, between 2010 and 2013. Comparing the percentage of agreement between case report and judicial decision, causal nexus was 79.9% and fault was 86.7%. The high percentages of agreement found in relation to fault and causal nexus highlight the relevance of expert reports in weighing the judge's decision.