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   2005| April-June  | Volume 5 | Issue 2  
 
 
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REVIEW ARTICLE
Extracoronal direct retainers for distal extension removable partial dentures
MA Aras
April-June 2005, 5(2):65-71
DOI:10.4103/0972-4052.16872  
Distal-extension removable partial dentures have always posed a challenging situation to the clinician and in such cases the strategic positioning of the direct retainers would ensure the long-term success of the prosthesis. Different direct retainer designs have been discussed by various authors in the literature. This paper highlights the extracoronal direct retainers, which can be used in the successful prosthodontic rehabilitation of distally edentulous arches with a removable partial denture.
  20,902 1,454 -
A review of the disorders of the temperomandibular joint
V Hegde
April-June 2005, 5(2):56-61
DOI:10.4103/0972-4052.16870  
Temperomandibular joint (TMJ) diseases and disorders refer to a complex and poorly understood set of conditions, manifested by pain in the area of the jaw and associated muscles, and limitations in the ability to make the normal movements of speech, facial expression, eating, chewing, and swallowing. It has been estimated that 25% of the general population suffer from TMJ related symptoms and only 2% of them seek treatment. General joint and muscle diseases, psychological and psychosocial factors, and local influences such as occlusal disturbances, parafunctional activities, that is, bruxism, and traumas, can affect the condition of the TMJ. This article describes the functional anatomy, classification, aetiopathology, and management of this condition in detail.
  20,748 1,025 -
CASE REPORT
Non-rigid connectors in fixed prosthodontics: Current concepts with a case report
PV Badwaik, AJ Pakhan
April-June 2005, 5(2):99-102
DOI:10.4103/0972-4052.16879  
The occlusal forces applied to a fixed partial denture (FPD) are transmitted to the supporting structures through the pontic, connectors, and retainers. Variables that may influence the longevity of an FPD and its abutment include occlusion, span length, bone loss, and quality of periodontium. The excessive flexing of the long-span FPD, which varies with the cube of the length of span, can lead to material failure of prosthesis or to an unfavorable response. Biomechanical factors such as overload, leverage, torque and flexing, induce abnormal stress concentration in an FPD. Stress concentration is found in the connectors of the prosthesis and in the cervical dentin area near the edentulous ridge. This factor plays an important role in the potential for failure in long-span FPD. The conventional use of a nonrigid connector (NRC) aids in compensating for the difference in the resistance and retention form between the abutments. The design and passive fit of NRC is critical to the success of a long-span FPD. This paper presents the current concepts in the design of an NRC and a case report of Pier abutment treated with FPD having Tenon-Mortise Connector.
  17,886 1,397 -
ORIGINAL ARTICLE
Prosthodontic management of severely worn dentition: including review of literature related to physiology and pathology of increased vertical dimension of occlusion
MG Krishna, KS Rao, K Goyal
April-June 2005, 5(2):89-93
DOI:10.4103/0972-4052.16877  
The factors causing severe wear of natural teeth must be identified and eliminated, or reduced before attempting restorative treatment. This will not only prevent further wear of teeth but also improve the long-term prognosis of restorative treatment. The different clinical situations can be classified in to three types, as described by Turner and Missirlian. While most of the cases can be managed without increasing the vertical dimension of occlusion (VDO), in some cases, the vertical dimension has to be increased. The evaluation and establishment of the occlusal vertical dimension (OVD) is considered particularly important. Before placement of fixed restorations to increase the VDO, a removable splint, and then provisional restorations must be tried to check the suitability of the increase in OVD. A kinematic transverse horizontal axis facebow transfer helps in the accurate transfer of horizontal relation to the articulator. Research with humans and animals has shown that if increases in OVD are not extreme and the occlusion is stable, then there is a good possibility of adaptation. Management of a case of severe teeth wear caused by bruxism is described.
  14,813 1,419 -
A spectrophotometric evaluation of color changes of various tooth colored veneering materials after exposure to commonly consumed beverages
R Gupta, H Parkash, N Shah, V Jain
April-June 2005, 5(2):72-78
DOI:10.4103/0972-4052.16873  
Purpose of study : Proper color match of a dental restoration with the adjacent teeth is important not only at the initial stage of giving the restoration but also over a longer period of time. Out of different materials Porcelain has established itself as being color stable and durable but composites are known to be susceptible to discoloration because of internal mechanisms, external contamination and staining. The newer universal composite systems are optimized in terms of composition to minimize internal discoloration but still not much attention is given to resistance to external staining. Procedure : Visual shade matching and color determination being a psychophysical phenomenon suffer from subjective variations in interpretation, therefore the present study was undertaken to evaluate and compare the color stability of a porcelain (Vitadur alpha) and two universal composites (Filtek Z 250 and Tetric Ceram) after exposure to commonly consumed beverages i.e. tea, coffee, coca-cola and distilled water (as control) by using a reflectance spectrophotometer and CIELAB system. Conclusion : T0 he color match of esthetic restorations in the oral cavity is affected by dietary habits
  10,548 654 -
Comparison of tensile bond strength of resilient soft liners to denture base resins
Amit V Naik, JL Jabade
April-June 2005, 5(2):86-88
DOI:10.4103/0972-4052.16876  
Purpose of the study: To determine the tensile bond strength of three commercially available soft liners to a polymethyl methacrylate denture base resin, to help the clinicians to select the liner for their patients, and to provide a comparative database when new materials are introduced. Basic procedures: In this study, tensile bond test was considered a good method of investigating and comparing the bond strength of three resilient lining materials, because it gives information on the strength of the bond in comparison to the tensile strength of the material. Main findings: The tensile bond strength of SuperSoft (acrylic-based liner) was better compared to Molloplast B (silicone-based liner) and Mucopren (silicone-based liner). Principle conclusion: The tensile test used in this study was effective in evaluating and comparing the tensile bond strength of the three liners. Factors such as processing methods, water sorption, bonding agents, changes in compliance, changes in the bond strength in the harsh oral environment, and chemistry of the material need further investigations to increase the serviceable life of the material.
  9,730 516 -
REVIEW ARTICLE
Denture adhesives - Their stand in prosthodontics
A Yadav, S Yadav
April-June 2005, 5(2):62-64
DOI:10.4103/0972-4052.16871  
Denture adhesives are used by an endless number of denture wearers and also by the dentists who fabricate them. Even then, Prosthodontists have a negative attitude towards the use of denture adhesives and assume that to advocate their use is a means of compensating deficiencies in clinical and technical procedures. Denture adhesives increase denture retention and thereby improve chewing ability, reduce denture wobble, improve comfort and confidence, and reduce amount of food particles collecting under the dentures. Moreover, adhesives undoubtedly provide the patients an increased sense of security and satisfaction, but they should use denture adhesives only on the advice of their dentists. Patients should also be instructed about the proper use and cautioned against misuse of denture adhesives, as a part of denture post delivery instructions.
  8,682 788 -
ORIGINAL ARTICLE
Amalgam-Composite hybrid restorations with amalgam bond: An in vitro marginal leakage study with CA45 radioisotope autoradiography
B Rajkumar, SV Bhagwat
April-June 2005, 5(2):94-98
DOI:10.4103/0972-4052.16878  
An in vitro study to evaluate Amalgam-Composite hybrid restoration was conducted and the marginal microleakage of three groups at Amalgam-Tooth interface, Composite-Tooth interface, and Amalgam-Composite interfaces were assessed in a Class V cavities using Ca45 isotope autoradiograhy. Comparing the different groups, the Amalgam bond was found to be superiorthan the Prisma Universal bond, copalite, or just acid etching of Amalgam surface in preventing the marginal microleakage at Amalgam-Composite interface.
  8,710 363 -
A comparative study on the retention of full coverage cast crowns cemented with zinc phosphate cement with and without die relief agent on prepared human teeth
R Luthra
April-June 2005, 5(2):82-85
DOI:10.4103/0972-4052.16875  
Purpose of study: The purpose of this study is to analyze the effect of die spacer on retention of full coverage crowns. The success of a full cast crown restoration depends on the marginal fit and the retention of the restoration. The application of die spacer helps to improve the fit of the crown, but its effect on postcementation retention has been a subject of controversy. The present study was undertaken to compare the retentive force required to dislodge the unspaced and spaced crowns. Methodology: Twenty-five freshly extracted molar teeth were prepared and two stone dies were prepared for each tooth. One die from each pair was coated with four layers of die spacer. A pair of castings was obtained for each tooth. Force required to dislodge the cemented castings was measured using a constant displacement-rate-testing machine. Conclusion: Die spacer reduces the retention of the castings. Die spacing must be used carefully to maximize its potential and eliminate the loss of retention.
  6,404 293 -
Engraved fixed restorations and denture micro-labelling to facilitate identification through forensic dentistry
PG Kamath, VG Kamath
April-June 2005, 5(2):79-81
DOI:10.4103/0972-4052.16874  
Identification is an essential requirement of any medicolegal investigations, because a mistaken identity may pose a problem in delivering justice. The importance of placing identification marks on dentures has long been acknowledged by the dental profession. Because there is no international consensus about the methods of denture marking, we suggest newer methods for the same. A procedure for marking accurate identification markings on crowns and fixed partial dentures and denture micro-labelling with minimal cost is described in this article. Individuals who have been subjected to restorative procedures like fillings may be carrying their 'visiting cards' in their oral cavity. Practicing dentists can become valuable members of the dental identification process by using these techniques to mark dental restorations, which would be valuable in restoring their patients' identity.
  5,514 380 -
EDITORIAL
Editorial
Suhasini J Nagda
April-June 2005, 5(2):55-55
DOI:10.4103/0972-4052.16869  
  2,940 157 -