It is generally agreed that the successful treatment of a badly broken tooth with pulpal disease depends not only on good endodontic therapy, but also on good prosthetic reconstruction of the tooth after the endodontic therapy is complete. Often, we come across an endodontically treated tooth with little or no clinical crown in routine clinical cases. In such cases, additional retention and support of the restoration are difficult to achieve. Two case reports are discussed here where structurally compromised, endodontically treated, posterior teeth were restored using the Richmond crown in the first case, and by the use of two nonparallel cast posts in the second case.

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The aim of this study was to compare and evaluate the coronal microleakage following endodontic treatment of teeth restored with three different intracoronal restorations using calcium-45 radioisotope and autoradiography. A total of 48 extracted human mandibular premolars with single canals were divided into three experimental groups of 16 specimens each. The teeth were sectioned horizontally at the cementoenamel junction and at the middle-third of the root, orifices and canals were enlarged with Gates Glidden bur and finished using K files, and obturated with gutta-percha cones using lateral condensation technique. 3 mm of gutta-percha were removed from the coronal part of the teeth to prepare a clean 3 mm deep cavity for the coronal restorative material. Group 1 consisted of teeth restored with Ketac Molar Easymix; group 2 with Miracle Mix and group 3 with Filtek Z350. The teeth were then thermocycled and tested for microleakage using calcium-45 radioisotope. The results were analyzed using Kruskal-Wallis test and Mann-Whitney test. Filtek Z350 exhibited the least leakage followed by Ketac Molar Easymix and Miracle Mix, and the microleakage among the three restorative materials was statistically significant.

Objective: To evaluate the clinical efficacy of direct and indirect composite resin restorations placed in posterior teeth after 2 years. Materials and Methods: A total of 60 teeth were restored with a direct composite resin (BRILLIANT EverGlowTM– Coltene) and an indirect composite resin (CeramageTM– Shofu). All restorations were assessed using the Modified United States Public Health Service criteria at baseline, 3 months, 6 months, 12 months, 18 months, and 24 months after placement. Statistical analysis was performed with Chi-Square test and Cochran's Q test. Results: At the 2-year evaluation, all restorations were retained, with Alpha ratings at 100%. Only two teeth (in the direct restoration group) required endodontic intervention after 18 months due to secondary caries. Surface texture, marginal discoloration, and marginal integrity were predominantly scored as Alpha after 2 years for both groups. Color match was scored as Alpha in 65.4% of direct restorations and 84.4% of indirect restorations. Conclusion: Within the limitations of this study it can be concluded that the clinical performance of the indirect restorations was much improved than that of direct restorations.

Introduction: Complete sealing of the endodontic access cavity between appointments and after completion of therapy is a vital element in the successful outcome of endodontic treatment. A common concern in day to day dental practice of conservative dentistry and endodontics is coronal leakage. Such a complication often leads to the failure of endodontic treatment. The intention of this in vitro study was to assess the potentiality of three different temporary restorative materials (TRM) in preventing microleakage in the coronal aspect of the access cavity during inter-appointment period in the course of endodontic treatment. Methods: Zinc oxide eugenol, Intermediate restorative material (IRM) (Dentsply Sirona) and CAVIT were the three materials used in the study. A total of 60 premolar teeth extracted for orthodontic purposes were collected (n=20). Endodontic access cavity was prepared and restored with temporary restorative material in the respective groups. The teeth were stored under methylene blue stain and were sectioned to be observed under stereo microscope at 1,2,4,7,10 days. The coronal microleakage was scored and the outcome was interpreted using Mann Whitney U test. Results: On the 1st and 2nd day, every material showed significant statistical difference in microleakage scoring. Zinc oxide eugenol showed the maximum and excessive microleakage. But after the 4th day, the difference in microleakage scores did not show significant statistical variation. Conclusion: The outcome indicated that the mixing ratio of powder and liquid for zinc oxide eugenol plays a prime role in coronal microleakage. Nevertheless, none of the materials could prevent coronal microleakage for a long period. Therefore, it is better to undertake early replacement of access cavity with permanent restoration.