The Long-term clinical performance of removable partial dentures (RPDs) delivered by Undergraduate Dental Students rarely investigated. Objectives: This study reports the results of a retrospective clinical study of RPDs delivered by the undergraduate students over three time periods over 15 years. Methods: 100 patients who had RPDs delivered by Undergraduate Students at the University of Saskatchewan between 1990 and 2005 were recalled. A comprehensive examination of the oral cavity and the RPDs was completed. 17 criteria for assessments were used include overall acceptance, stability, support, retention, adaptation, occlusion, integrity of the prostheses, rests and rest seats, design, occlusal wear, esthetics, phonetics, tissue condition, mobility of the abutment teeth, gingival and plaque indices. The data were analyzed based on the time period in which the RPDs were delivered. Three periods were chosen to compare the data: 1990-1995, 1995-2000, and 2000-2005. A 4-point scoring system (Alpha, Bravo, Charlie, Delta) was used to assess each criterion. The data were analyzed using Kruskal-Wallis and the Mann-Whitney U non-parametric statistical tests. Results: Plaque and gingival indices were rated the lowest for Alpha scores. Failure of the RPDs was mainly due to poor patient acceptance, poor retention, compromised integrity and poor adaptation. 82.1% success rate was observed for the prostheses delivered between 1995 and 2000 compared to 59.5% and 69.8.4% for the prostheses delivered during 1990-1995 and 2000-2005 respectively. Kruskal-Wallis showed a highly significant difference in Alpha scores between the three groups of RPDs. Mann-Whitney U showed no significant difference in Alpha scores between the RPDs delivered within two time periods (1995-2000 and 2000-2005), (p<0.05). Conclusion: The clinical performance of the RPDs delivered between 1995 and 2000 showed higher success rate compared to RPDs delivered during the other two time periods (1990-1995 and 2000-2005). Patience acceptance to the prostheses was a major concern.