Shobha J Rodrigues

Accuracy of elastomeric impression materials on repeated pours

There are doubts persisting in dentistry concerning the accuracy of elastomeric materials on repeated pours of impressions, since their introduction in 1950s. Greatest accuracy with all impression materials is obtained when the impressions are poured immediately. The accuracy of elastomeric impression materials on repeated pours is reviewed in this article.

Resilient liners: a review.

Resilient liners when used intelligently are an excellent adjunct in removable prosthodontics. However, currently they have to be best considered as temporary expedients because none of the advocated permanent liners have life expectancy comparable to resin denture base. This article reviews the literature regarding their composition, functions, gelation characteristics, bond strength and influence on denture bases. It also presents their drawbacks and attempts made to extend their longevity. A Medline search was completed for the period from 1986 to 2007, along with a manual search, to identify pertinent English peer-reviewed articles and textbooks.

Changing face of infection control: Dental unit water lines

The quality of dental unit water is of considerable importance since patients, staff are regularly exposed to water and aerosols generated from the unit. The contamination of dental unit waterlines (DUWL) is an issue that is of great concern to the dental profession, including Prosthodontics since the water in these lines has the capacity for rapid development of biofilms combined with the generation of potentially contaminated aerosols becoming an ideal environment for the growth of microorganisms. This article describes the conditions in waterline tubing that favour development of biofilms and discusses the level of risk that such microbial growth poses for both dental professionals and their patients. It is stressed that very few cases of infection have been linked directly to contamination in dental unit waterlines. Finally, potential solutions for minimizing risks are presented and discussed.

Prosthetic rehabilitation of a patient after partial maxillectomy: A clinical report

Malignant melanoma of the oral cavity is very rare. This clinical report describes a method for prosthetic rehabilitation of a patient with malignant melanoma of the palate following partial maxillectomy with a closed hollow interim obturator.

Iatrogenic dentistry and the periodontium

The health of the surrounding hard and soft tissues is important for the optimal functioning of the natural dentition. The dentist plays a positive role in maintaining the health of the diseased oral tissues if a careful and meticulous diagnosis, treatment planning and treatment procedures are carried out. On the other hand, the dentist may be incriminated in perpetuating damage to the tissues as a result of injudicious / careless dental therapy. This article is a review on the implications of common dental procedures for the periodontium.

Iatrogenic complications of implant surgery

Implants have gained tremendous popularity in modern dental practice and their placement in the edentulous region for the prosthetic reconstruction has become routine. Four essential steps in the use of dental implants, are careful selection of the patient, correct choice of the implant, proper surgical technique and precise prosthetic replacement. The operator’s knowledge and skills have a significant role in each of these steps and each step is as important as others. Neglect in any one can result in iatrogenically induced damage. This article describes some of the commonly occurring iatrogenically induced complications during implant surgery and provides some guidelines to prevent the same.

A Comparative Evaluation of Stress Distribution with Two Attachment Systems of Varying Heights in a Mandibular Implant-Supported Overdenture: A Three-Dimensional Finite Element Analysis: Stress Distribution in a Mandibular IOD

PURPOSE To analyze and compare the stress distribution in an implant-retained overdenture complex using ball and Locator attachments of three heights by means of a 3D finite element analysis (FEA). MATERIALS AND METHODS Six finite element models comprising an edentulous mandible with two interforaminal bone-level implants and ball attachments of heights 1 mm (A1), 3 mm (A3), and 5 mm (A5), and Locator attachments of heights 1 mm (B1), 3 mm (B3), and 5 mm (B5), were designed using ANSYS Workbench Software. Unilateral vertical (100 N) and oblique loads (100 N at 30° to the longitudinal axis of the implant in buccolingual direction) were applied. Average von Mises stress values were evaluated quantitatively and qualitatively. RESULTS Locator attachments showed lower stress values as compared to the ball attachments in all examined areas. The increase in the height of both resulted in increased stress values. Higher values were observed at the implant neck in all models, as compared to the body and the apex. The recorded stress was higher in the cortical bone as compared to the cancellous bone. CONCLUSIONS Within the limitations of the study, Locator attachments demonstrated lesser and more homogenous stress distribution in the implant-overdenture complex in comparison to ball attachments. The stresses generated within the tissues increase with an increase in collar height of the attachment system and therefore, attachments should be as short as possible for more favorable stress transmission.

Evaluation of the Effect of Different Finish Lines and Luting Agents on Marginal Fit and Microleakage in Direct Metal Laser Sintered Copings-An in Vitro Study

Background & Objectives:. The present study aimed to study the effect of finish line and luting cements on marginal gap and micro leakage in copings fabricated by Direct Metal Laser Sintering (DMLS) Methods: 28 maxillary premolars were divided

Effect of exposure time of eugenol containing temporary cement on tensile bond strength of permanent restorations luted with Self-Adhesive dual cure resin cement-An in vitro study

Purpose: This study was conducted to evaluate the tensile bond strength and fracture mode of permanent restorations luted with self-adhesive resin luting agent following provisional cementation with eugenol containing luting agents

Comparison of quality of impression and clinical performance after gingival displacement with magic foam cord and gingival retraction cord-An in vivo study

Purpose: The purpose of this in vivo study was to investigate the effectiveness of two different gingival displacement techniques. Method: Thirty nine prepared abutment teeth (n=39) of 19 patients were evaluated in this prospective clinical study.