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Table of Contents
January-April 2014
Volume 2 | Issue 1
Page Nos. 1-40
Online since Thursday, December 12, 2013
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REVIEW ARTICLES
Evaluation and assessment of bonding of heat cure acrylic resin to cobalt-chromium alloy: Old ideas employing newer concepts
p. 1
Ashish Kumar, Kishan Singh, Anurag Sarin, Shobhit Sachdeva, Shreshtha Singh
DOI
:10.4103/2347-4610.122987
Literature has evidenced marvelous work on increasing bond strength between acrylic resin and partial denture casting alloys in past by various pioneer workers. Several systems have been employed to increase the bond strength between acrylic resin and partial denture casting alloys. Some of the popular methods were silicate layer silane coupling agents, active acrylate monomers: Polyfluormetacrylate bonding agents, tin oxide layer, and bifunctional monomer (dual function group). With the exception of air abrasion, most techniques are associated with expensive equipment, technique sensitivity, and harmful chemicals. Air abrasion, however, consistently has been associated with improved bond strengths. Traditionally, denture base acrylic resin is attached to the metal framework by three types of retentive aids: Mechanical, chemical, or combination of both. Advantage of retentive elements weakens the acrylic resin base by creating stress and by replacing its bulk on which resin depends for strength. Failure of the resin at the interface is a common source of problems when forces exceed the capacity of the retentive mechanisms. Here, authors have sought to review the bonding strength between acrylic resin and partial denture casting alloys along with their clinical applicability that can best retain the said prosthesis with minimal failure.
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Marginal integrity of metal copings of various porcelain fused to metal alloys using different ring casting techniques: A systematic literature review
p. 7
Devvrat Singh, Sumita Giri Nishad, Mohit Sharma, Anurag Sareen
DOI
:10.4103/2347-4610.122988
Precise marginal seating of fixed prosthesis over prepared abutments is crucial to fulfill biological, physical, and cosmetic requirements. Accurate fit of the restoration margins to the prepared finish line is necessary to prevent gingival inflammation, secondary caries acting as an important indicator of the overall acceptability of the cast restoration. The clinical success with porcelain fused to metal restorations lies in achieving both predictable esthetics and function. The design of the tooth preparation can have an effect upon laboratory and clinical success of individual restorations and types of restorations. The accuracy of casting holds the key to long-term success with these restoration. The presented literature review is an attempt to highlight the historical approaches, various pioneer researches, different controversies, difficulties, and current trends for casting of metal employing various techniques. A detailed literature search was conducted using MEDLINE/PubMed databases and other scholarly research bibliographic databases using Medical Subject Headings (MeSH). Studies describing research studies and
in vitro
studies were retrieved and evaluated from 1955-2013.
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Color stability of aesthetic restorative materials after exposure to commonly consumed beverages: A systematic review of literature
p. 15
Kishan Singh, Suraj Suvarna, Yoshaskam Agnihotri, Sukant Sahoo, Prince Kumar
DOI
:10.4103/2347-4610.122989
Accurate shade matching of tooth colored restoration with the adjacent dentition is essential not only at the time of fabrication but also for the life time durability. This is a factual truth for dental porcelain but in contradiction, color instability in porcelain restoration is a common dilemma nowadays, especially when they are exposed to routinely consumable beverages, which sever its nature of being tooth colored. Here the authors have attempted to highlight the historical outlooks, researches on color stability and difficulties, and current trends for color stability in tooth colored restorative materials, predominantly dental ceramics. A methodical literature search was performed using MEDLINE/PubMed and other scholarly research bibliographic databases using Medical Subject Headings (MeSH) from 1953 to 2013. Most of the studies suggest and evidence that there is no ceramic available, which could be classified as total stain free; however, there is wide diversity in their color stability and surface characteristics seen with different oral conditions both qualitatively and quantitatively.
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ORIGINAL ARTICLES
Theoretical versus practical application of prosthodontic techniques in private dental clinics in India: A survey
p. 23
Gurminder Singh, Ramandeep Singh Gambhir, Rina Singh, Harpreet Kaur
DOI
:10.4103/2347-4610.122990
Objectives:
To know the various prosthodontic techniques followed by the private dental practitioners as compared withthe techniques taught to them in the dental schools.
Materials and Methods:
A survey was done to determine the prosthodontic techniques by private practitioners in India. A pretested questionnaire performa containing questions on complete denture, removable partial denture, and fixed partial denture fabrication was prepared for the private practitioners to be filled up. A total of 700 subjects were included in the final study (70% response rate).
Results:
A total of 80.4% of the practitioners used to do the whole prosthetic treatment themselves. A total of 61.7% used to make study casts before the treatment. And, 85% of the practitioners preferred to make complete dentures using double impression technique. Most practitioners faced problems during fabrication of complete dentures, removable partial denture, and fixed partial prosthesis.
Conclusion:
The findings from this study showed that the respondents did not follow the techniques and procedures which were being taught in the dental schools which had been deemed to be clinically essential for the successful prosthodontic treatment and there was a need for continuing dental education programs for the private practitioners for upgradation of their clinical skills.
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ORIGINAL ARTICLE
Residual monomer content of repair autopolymerizing resin after microwave postpolymerization treatment
p. 28
Suraj Suvarna, Tamanna Chhabra, Deepti Raghav, Devvrat Singh, Prince Kumar, Sukant Sahoo
DOI
:10.4103/2347-4610.122991
Purpose:
Acrylic resins are one of the extensively used materials in removable prosthodontics however; complete dentures are highly vulnerable to fracture after long periods of clinical use. The repair of fractured prosthesis can be accomplished using acrylic resins that are light polymerized, autopolymerized, heat polymerized or microwave polymerized.
Aim:
To evaluate the residual monomer content of three different repair autoploymerising resins processed by two different polymerization techniques after microwave postpolymerization treatment.
Materials and Methods:
The study was executed with fabrication of a metal die and sixty test specimens of three different materials. The specimens were cured with conventional method and using pressure pot. After this the specimens were tested for residual monomer content using Fourier transform infrared spectroscopy.
Results and Conclusion:
Results confirmd that their residual monomer content decreased by subjecting them to another cycle of polymerization in microwave at 550 watts for 3 minutes.
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CASE REPORTS
Prosthetic management of ocular defects: A case series
p. 33
Laxman Singh Kaira, Rahul Bhayana, Vipul Asopa, Achyut N Pandey, Esha Dabral
DOI
:10.4103/2347-4610.122992
An ocular prosthesis is a simulation of a perfectly normal healthy eye and surrounding tissues. The primary purpose of an ocular prosthesis is to maintain the volume of eye socket and create the illusion of a healthy eye and surrounding tissue. A custom ocular prosthesis is a good option when reconstruction by plastic surgery or the use of osseointegrated implants is not possible or not desired. Prosthetic rehabilitation of a patient with missing eye with custom made ocular prosthesis was described.
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Magnetically retained extra oral prosthesis and maxillary interim obturator
p. 37
Shelly Goyal, Mukesh K Goyal, Parithimar Kallingan
DOI
:10.4103/2347-4610.122993
Rehabilitation of patients with acquired defects of the maxilla is a challenge in terms of re-establishing oro-nasal separation. In most patients, these goals are met by means of prosthetic rehabilitation with an obturator prosthesis. Prosthetic rehabilitation can be achieved satisfactorily if all facets of treatment planning and design consideration are taken into account prior to the rehabilitation process. In many cases, effective obturation is achieved, but, in the relative majority, the prosthesis is usually rejected by the patient as being non-retentive and the outcome is a failure. Therefore, making the prosthesis hollow and incorporation of retentive features in effective way can have a dramatic effect on the stability and retention of the obturator prosthesis in partially dentulous maxillectomy patients. This clinical report describes prosthetic rehabilitation of acquired maxillofacial defect with magnetically retained maxillary interim obturator with extra-oral prosthesis. Extra-oral prosthesis was retained with closed-field magnet system. Defect was developed following post-maxillectomy due to olfactory neuroblastoma and surgical obturator.
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Online since 10 March, 2013