Intraoral scanners (IOSs) are used for capturing the direct optical impressions in dentistry. The development of three-dimensional technology and the trend of increasing the use of IOSs in dental office routine lead to the need to assess the accuracy of intraoral digital impressions. The aim of this review was to assess the accuracy of the different IOS and the effect of different variables on the accuracy outcome. An electronic search using PubMed with specific keywords to obtain potential references for review. A search of MEDLINE (PubMed) identified 507 articles. After title and abstract screening, 412 articles were excluded for not meeting the inclusion criteria and discarding duplicate references. Ninety-five articles were followed for full screening; only 24 articles were included in the final analysis. The studies indicated a variable outcome of the different IOS systems. While the accuracy of IOS systems appears to be promising and comparable to conventional methods, they are still vulnerable to inaccuracies.

This is a case report of the management of pulp canal obliteration of maxillary central incisor using guided endodontic therapy. Patient reported with discolored and proclined 11. Intraoral periapical (IOPA) Radiographs and cone-beam computed tomography (CBCT) showed periapical radiolucency. The canal was obliterated till the middle third and was patent in the apical 7 mm. Root canal treatment (RCT) was planned using guided endodontics. Information of CBCT and digital surface scan were integrated using Blue Sky Bio software. A transparent three-dimensional (3D) model of the tooth and stent, designed with a sleeve for insertion of bur, was 3D-printed using clear resin. After orientation was found satisfactory on the 3D model, access opening was initiated with the orientation of round bur through the stent. IOPAs were taken after preparation of every 3 mm. The canal was located in the apical third. Cleaning and shaping were performed, and RCT completed successfully. Guided endodontic therapy is useful in the management of calcifications in anterior teeth.

Background and objectives This in vitro study evaluated and compared the abrasion resistance of types IV and V gypsums, resin-modified type IV and type V gypsums, synthetic gypsum, and epoxy resin die material at two different time intervals spanning a period of 24 hours. Materials and methods A total of 10 dies of each die material were fabricated and tested for abrasion resistance at each time interval. An average of five readings was taken for the test, measuring the rate of abrasion of the materials. Results All the tested properties of the epoxy resin material were far superior to those of the other materials (being tested). Resin-modified type IV gypsum had significantly better abrasion resistance than its type V counterpart at setting. However, when tested at 24 hours, both materials had comparable resistance to abrasion, which was the highest among the gypsum-based materials. Interpretation and conclusion Epoxy die resin had the most superior physical properties of all. A significant decrease in the rate of abrasion (-38 to -83%) was noted, when the gypsumbased products were tested at 24 hours. From the data obtained in this study, it is recommended that when gypsum-based materials are used, to wait at least 24 hours prior to separating casts from impressions (and subsequent laboratory procedures) to avoid damage to the casts and dies. Abbreviations RR IV: Resin modified type IV gypsum; RR V: Resin modified type V gypsum; S: Synthetic gypsum; V: Type V gypsum; IV: Type IV gypsum. How to cite this article Wankhade SV, Sanghavi KV, Rajguru V, Lokade J. A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study. Int J Prosthodont Restor Dent 2013;3(1):1-6.

Lack of stability and support from conventional complete denture is the persistent enigma of all times. Rehabilitation of such cases fail to please patients as well as it is distressing for dentist. Over denture on other hand has upper hand over conventional denture with respect to not only just stability and support but it also enhances the proprioception and lowers the rate of residual ridge resorption. Overdenture with a bar attachment splints the tooth together which causes even distribution of stresses. This case report dictates successful rehabilitation of a patient with the same concept applied clinically.

Prosthetic rehabilitation using complete dentures is quite a challenging task when accompanied by severely atrophic ridges. Various modifications are required in the treatment strategy to optimize the prognosis of the finished prosthesis. Moreover, the increased inter-arch space demands the hollowing of the maxillary denture to mitigate the issues in retention due to increased weight. This case report aims to demonstrate a technique used to fabricate a hollow maxillary denture and a mandibular denture using the neutral zone approach in the case of a severely atrophied ridge.