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Are There Differences in Technical Assessment Grades Between Adjunct and Full-Time Dental Faculty? A Pilot Study.

Some dental students preferentially schedule graded assessments with adjunct faculty members in expectation of obtaining a higher grade. The aim of this pilot study was to compare the grades given by full-time and adjunct faculty members in clinical periodontics to determine if a difference in grading existed. Grades for students given by seven full-time and 11 adjunct faculty members for various technical and competency assessments in D3 and D4 clinical periodontics courses in academic year 2015-16 were compared. Associations between grades and faculty type were sought using mixed model regression to account for correlations among a student's scores. A total of 845 technical assessment and competency scores from 208 students in the two classes were included in the analysis. Scores were for four procedures: periodontal examination and treatment planning, scaling and root planing, evaluation of initial therapy, and periodontal maintenance. Full-time faculty members graded 58% of the assessments, and 42% were scored by adjunct faculty members. Grades for the adjunct faculty were on average 0.14 (out of 5) higher than those for the full-time faculty (p<0.0001). The number of graded assessments was also significantly associated with a higher average score, suggesting potential student bias toward selecting faculty members who grade more favorably (p<0.0001). These students generally received higher grades from adjunct faculty members, whereas the grades given by full-time faculty members were closer in average and more consist with each other. The results point to the need for more calibration training for adjunct faculty members.