Assessment of undergraduate students’ tooth preparation for full veneer cast restorations

Abstract

Purpose: To evaluate tooth preparation for full veneer cast restorations performed by final year dental students in Sudan. Materials and Methods: 117 stone dies from two different dental institutions were collected and evaluated. Polyvinylsilioxane impression material was used to produce two impressive replicas of which one was sectioned in faciolingual plane and the other in mesiodistal plane. Occlusal clearance was measured using a digital caliper. Amount of axial preparation was also measured. Impression silhouettes that were produced using an overhead projector were used to measure convergence angle. Working casts were examined for smoothness and evenness of the preparations, existence or absence of additional features of retention and the finishing line were evaluated for its position and continuity. All obtained data were statistically analyzed by using T-test, ANO-VA, and Pearson Chi square tests. P-values ≤ 0.05 were considered as statistically significant. Results: Average taper of the examined preparations was 39.98˚, with 44.1˚ in the faciolingual, and 35.8˚ in the mesiodistal dimensions. Preparations for full coverage restorations were over prepared. 38.5% of the total number of preparations were found to have finishing lines in the sub and supra gingival positions. 19.66% were unable to maintain continuity of the finishing line all around the preparation. All preparations were generally smooth with no sharp angles, and 1.7% of the preparations had additional retentive features. Conclusion: Within the limitations of this study, it could be concluded that the convergence angle and finishing line preparations were less than adequate in a sizeable proportion of the preparations examined.

Evaluation of Postoperative Pain After Using Different File Systems: A Randomized Clinical Study

“…22 In the present study, gender did not affect the incidence of postoperative pain, despite the female patients demonstrated slightly higher scores for all time intervals in accordance with other studies. 13,22 Additionally, the location of the tooth was not found to be a determinant on the pain scores, since no difference was found between mandibular and maxillary teeth. Besides, asymptomatic teeth were included to eliminate a possible preoperative variation.…”

“…In this study, a four-point pain intensity scale, which was considered to be an adequate and reliable method, was used. 13 This scale method was also used in various recent studies for measuring the severity of postoperative pain after root canal treatment. 1,13,14 Different time intervals can be selected to evaluate the intensity of pain.…”

“…13 This scale method was also used in various recent studies for measuring the severity of postoperative pain after root canal treatment. 1,13,14 Different time intervals can be selected to evaluate the intensity of pain. The evaluation of postoperative pain was performed for different time periods in recent studies.…”

Evaluation of undergraduate dental students in typodont preparation for all-ceramic crowns

“…16,17 This result is consistent with the finding among students in the Faculty of Dentistry, Universiti Kebangsaan in Malaysia, and College of Dentistry in Khartom University. 8,9 One of the limitations of this study is the use of traditional equipment to evaluate their preparation. We have to use the 3D programs or new machines, such as CAD/CAM.…”

“…In general, preparations were smooth with no irregularities or sharp angles. 8,9 Pre-clinical laboratory performance on the typodont with ivory teeth had a strong correlation with the clinical performance by dental students in the preparation of anterior ACCs. 1 Therefore, adequate preclinical prosthodontic training is an integral part of the curriculum, and the teaching staff should regularly monitor the students during pre-clinical training courses.…”