Journal of Nepalese Prosthodontic Society



Introduction: An accurate impression is the foundation of denture fabrication process thus a practitionershould be aware of the possibility of including errors during this procedure. Time spent in making agood impression will reduce the time required in adjusting the final prosthesis as well as make it morecomfortable for the patient in accepting the prosthesis.

Materials and Methods: Maxillary arch final impressions made by undergraduate dental studentson 106 edentulous patients were evaluated. The impressions were assessed on the basis of criteria’slike errors on mixing, flow, tray positioning, presence of voids, creases/irregularities, exposure oftissue stops and extension at posterior border. The data’s collected were analyzed for the frequency ofoccurrence and distribution of each type of errors.

Results: It was found that 97.2% of students performed at least one detectable error during making ofmaxillary arch final impression. The number of errors made by students ranged from single to as muchas seven errors in one impression. The most common error was lack of exposure of all tissue stopsfollowed by presence of voids and creases/irregularities on impression surface.

Conclusion: There is high possibility of including errors while making maxillary arch final impressionby undergraduate dental students. The study highlights the need to explore novel techniques of clinicaldemonstrations and teaching important concepts to learning students. The inclusion of more pre-clinicalexercises in undergraduate curriculum relating to manipulation of dental materials may improve skillsof students in making accurate edentulous impressions.

Key words: Complete denture; edentulous patients; final impression; maxillary impression

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