To analyze the causes of adverse events in undergraduate endodontics practice teaching, and to discuss the countermeasures of reducing and preventing adverse events.

A total of 144 adverse events of interns were reported by the Volunteer Reporting System of the Affiliated Stomatological Hospital of Sun Yat-sen University, from January 2014 to December 2018. The retrospective analyzes were used to summarize these adverse events, analyze their causes, and formulate improvement and preventive measures. Mann-Whitney U test was used to analyze the types and the causes of adverse events by SPSS 25.0 software.

The adverse events in undergraduate endodontics practice teaching included occupational exposure, medical communication events and medical treatment events, among which the Ⅲ level events and Ⅳ level events were multiple types. The occupational exposure was the most common, adding up to 63 in the past five years. There were significant statistical differences between the occupational exposure group and the other two groups, including medical communication events (Z = 5.765, P<0.001) and medical treatment events (Z = 4.163, P<0.001) . The negligence or non-standard operation may act as the major risk factor to occupational exposure. There were significant statistical differences between the negligence or non-standard operation and the other three groups, including insufficient awareness of prevention (Z = 4.063, P<0.001) , patient related factors (Z = 3.421, P<0.001) , and insufficient education (Z = 4.263, P<0.001) . The major cause of medical communication events was the health care attitude. There were significant statistical differences between the health care attitude and the other three groups, including fees (Z = 4.139, P<0.001) , unrealistic expectations of patients (Z = 3.990, P<0.001) , and distrust of undergraduates (Z = 3.314, P<0.001) . Causes of medical treatment events were lack of knowledge, non-standard operation and insufficient guidance from teachers, and there was no significant difference among the three groups (P>0.05) .

It′s essential to reduce the occurrence of adverse events and promote the harmonious development of doctor-patient relationship by establishing various preventing and improvement measures.