Objective: The aim of this study was to evaluate the quality of the apical seal in teeth with a single root canal performed by undergraduate dental student's (4th year, Juniors) carrying out their first post cementantion at Instituto Superior de Ciências da Saúde Egas Moniz, Portugal, School of Dentistry.
Method: 106 teeth were obturated using gutta-percha and sealer, one for each student. Post ... [Show full abstract] preparation with Rebilda Post drills (Voco, Cuxhaven, Germany) was made and cementation of Rebilda fiber posts (Voco, Cuxhaven, Germany) was performed with Rebilda DC (Voco, Cuxhaven, Germany). Standardized digital radiographs were then obtained with a Kodak RVG 5100 Digital Radiography System (Carestream Health, Inc, Stuttgurt, Germany)and assessed using Kodak Dental Imaging Software Installation (KDIS v. 188.8.131.52, Carestream Health, Inc, Stuttgurt, Germany) for quantified criteria including size of post, size of post space,gap between the tip of the post and the apical, quality and length of apical seal, root filling.
Result: The average fiber post used was 8,27mm in leght (from the CEJ ). The average apical seal was 4,75 (+/-1,17)mm and the average gap was 0,43 (+/-0,75)mm. 96,23% of the teeth were accepted for the study since 3,77% did not present a fiber post. 79,41% had no problems and were considered successful. 3,92% had short apical seal, 0,98% had very short apical seal and 11,76% had very big apical seal. 0,98% had no gutta perscha in the apical seal, and 1,96% didn't remove the gutta perscha completely along the canal walls.
Conclusion: This methodology was useful for qualitative assessment of undergraduate students work. Further refinements to the teaching/evaluation procedures made by the undergraduate staff must be carried to better prepare the inexperienced students for their clinical work.