Aims and Objectives:To determine the time dependent accuracy of casts made from three different irreversible hydrocolloids.Materials and Methods:The effect of delayed pouring on the accuracy of three different irreversible hydrocolloid impression materials – Regular set CA 37(Cavex, The Netherlands), regular set chromatic (Jeltrate, Dentsply), and fast set (Hydrogum soft, Zhermack Clinical) was investigated. A brass master die that contained two identical posts simulating two complete crown-tapered abutment preparations with reference grooves served as a standardized master model. A total of 120 impressions were made using specially prepared stock-perforated brass tray with 40 impressions of each material. The impressions were further sub-grouped according to four different storage time intervals: 0 min (immediately), 12 min, 30 min, and 1 h. The impressions were stored at room temperature in a zip-lock plastic bag. Interabutment and intraabutment distances were measured in the recovered stone dies (Type IV, Kalrock) using a profile projector with an accuracy of 0.001 mm. The data so obtained was analyzed statistically.Results:Results of this study showed no statistically significant differences in the accuracy of casts obtained at different time intervals.Conclusion:Because it is not always possible to pour the impression immediately in routine clinical practice, all irreversible hydrocolloid materials studied could be stored in a zip-lock plastic bag for upto 1 h without any significant distortion.

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In recent years, radiation therapy has been used with increasing frequency in the management of neoplasms of the head and neck region. Brachytherapy is a method of radiation treatment in which sealed radioactive sources are used to deliver the dose a short distance by interstitial (direct insertion into tissue), intracavitary (placement within a cavity) or surface application (molds). Mold brachytherapy is radiation delivered via a custom-fabricated carriers, designed to provide a more constant and reproducible geometry for source positioning. Radiation carriers are customized to fit the patient in a comfortable, stable, and retentive manner to ensure maximal therapeutic radiations to the desired location and in addition sparing the normal surrounding tissues due to rapid fall-off radioactivity thus minimizing postreatment sequelae of irradiation. This clinical report describes a method of fabrication of a customized radiation carrier or mold for a patient suffering from squamous cell carcinoma of right ring finger, planned to undergo brachytherapy (surface mold therapy). This paper highlights the role and responsibility of the prosthodontist in fabricating the carrier and to maintain the predetermined position of the hollow tubes (catheters) within the mold to remain in the exact position as determined by the radiation oncologist for required results.

Biological fixation between the dental implant surfaces and jaw bones should be considered a prerequisite for the long-term success of implant-supported prostheses. The implant surface modifications gained an important and decisive place in implant research over the last years. Nowadays, a large number of implant types with a great variety of surface properties and other features are commercially available and have to be treated with caution. Although surface modifications have been shown to enhance osseointegration at early implantation times, for example, the clinician should look for research evidence before selecting a dental implant for a specific use.