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  Citation statistics : Table of Contents
   2008| January-March  | Volume 8 | Issue 1  
    Online since October 4, 2008

 
 
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CLINICAL REPORTS
Implant-retained orbital prosthesis
Kanchan P Dholam, Hrishikesh A Pusalkar, Prabha Yadav, Pravin P Bhirangi
January-March 2008, 8(1):55-58
DOI:10.4103/0972-4052.43257  
An 11-year-old woman reported with rhabdomyosarcoma of the right eye, with cranial involvement. The patient had received multimodal treatment comprising chemotherapy and orbital exenteration. Implant-retained orbital restoration was considered after a decade of the curative treatment. One implant was placed in the supraorbital ridge and the other implant, in the frontal process of the zygoma. Subsequently, implant-supported magnet-retained prosthesis was fabricated.
  1 2,934 374
ORIGINAL ARTICLES
A study to evaluate the transverse strength of repaired acrylic denture resins with conventional heat-cured, autopolymerizing and microwave-cured resins: An in vitro study
Manisha Agarwal, Ajay Nayak, RB Hallikerimath
January-March 2008, 8(1):36-41
DOI:10.4103/0972-4052.43252  
Statement of Problem: Acrylic resin dentures are susceptible to fracture after clinical use; it is an unresolved problem in prosthodontics. The repair procedure should be simple, strong and should not affect dimensional accuracy. Purpose: This study evaluated the transverse strength of a conventional heat-polymerized (DPI-Heat Cure, Group I) acrylic resin and a microwave-polymerized (Acron MC, Group III) acrylic resin that were repaired with the same resins and with an autopolymerized acrylic resin (DPI-Repair Resin, Group II). Materials and Methods: Sixty rectangular specimens of Groups I and III and 15 of Group II were manufactured and stored in distilled water at room temperature for 7 days. Forty-five specimens of Groups I and III were selected randomly. Fifteen specimens of each material remained intact (control), 15 from each group were sectioned in the middle to create a 10-mm gap and repaired with the materials of Groups I, II and III. After 7 days of storage at room temperature, transverse strength of the repaired and intact specimens was measured using a 3-point bending test. The nature of failure was noted as adhesive, cohesive or mixed. Student's unpaired t -test was performed. Results: The intact microwave-cured resin (Group III) showed the highest transverse strength value (90.25 MPa), which was significantly stronger ( P < 0.05) than other materials tested. No statistically significant difference was noted amongst the repaired groups. Repaired specimens exhibited three types of failure: adhesive (15.56%), cohesive (15.56%) and mixed being the maximum (68.89%). Conclusion: Microwave-polymerized resin showed the highest intact transverse strength, and autopolymerized resin exhibited repair strength similar to those found for the conventional heat- and microwave-polymerized acrylic resins.
  1 3,366 435
CLINICAL REPORTS
Stabilization of interocclusal records during programming of the semiadjustable articulator
Dakshinamurthy Sendhilnathan, G Sivagami
January-March 2008, 8(1):42-43
DOI:10.4103/0972-4052.43253  
Semiadjustable articulators are used in the fabrication of complete dentures and programmed using interocclusal records. Interocclusal records made in the centric, protrusive, right and left lateral excursive positions are generally used in programming the articulator. A split upper cast is an essential prerequisite, and the space appearing between the maxillary cast and the split helps in verifying proper seating of the cast during the programming. This article describes a simple method of stabilizing the interocclusal records and restricting the possibility of movement in the split cast.
  - 3,803 806
Full-mouth rehabilitation of completely edentulous patient using implant-supported fixed prosthesis
DR Prithviraj, Ankit Gupta
January-March 2008, 8(1):44-47
DOI:10.4103/0972-4052.43254  
Modern dentistry aims to return patients to normal oral health and function in a predictable fashion. The selection of the ­available therapy has a substantial influence on the level of quality with which this objective can be met. Satisfying a completely edentulous patient is always considered a difficult task. Various treatment options for rehabilitation of the completely edentulous patient are available: conventional complete denture, overdenture, implant-supported overdenture and full-arch fixed implant-supported prostheses. The patient's function while wearing a complete denture may be reduced to 60% compared with that previously experienced with natural dentition; however, implant prosthesis may return the function to near normal limits. This clinical report presents rehabilitation of a completely edentulous patient who was not satisfied with his existing conventional complete dentures. The patient was rehabilitated using full-arch implant-supported fixed ceramometal prostheses. The final treatment result provided the patient with esthetically and functionally efficient prostheses.
  - 5,800 932
Functional and esthetic rehabilitation of severely worn dentition with an end-to-end relationship
Puneet Bhardwaj, Meena Aras
January-March 2008, 8(1):48-51
DOI:10.4103/0972-4052.43255  
Full-mouth fixed rehabilitation is one of the greatest challenges in prosthodontics.Apprehensions involved in the reconstruction of debilitated dentitions are heightened by widely divergent views concerning the appropriate procedures for a successful treatment. This clinical report describes the prosthodontic rehabilitation of a patient with severely worn dentition resulting in an end-to-end relationship. Maxillary and mandibular fixed restorations and cast partial denture were constructed for the therapy. Canine-protected occlusion was developed in the definitive restorations to decrease lateral forces on the posterior dentition. Protrusive guidance was developed to distribute the protrusive forces to the maxillary and mandibular incisors.
  - 2,292 510
Muscular torticollis - functional and esthetic rehabilitation with an indigenously designed neck stabilizing appliance
Manoj Shetty, Chethan Hegde, Jogeshwar Burman, Krishna D Prasad, Piyush Tandan
January-March 2008, 8(1):52-54
DOI:10.4103/0972-4052.43256  
Muscular torticollis results from shortening or excessive contraction of the sternocleidomastoid muscle. The reported incidence varies between 0.4% and 1.9%, and it is the third most common musculoskeletal anomaly that affects children (after hip dislocation and club foot). A 23-year-old female patient suffering from congenital muscular torticollis reported to the Department of Prosthodontics, A.B. Shetty Memorial Institute of Dental Sciences, Deralakatte, Mangalore. Applying an interdisciplinary approach involving a team comprising an oral and maxillofacial surgeon, a prosthodontist and a physiotherapist, we functionally and esthetically rehabilitated the patient.
  - 2,195 216
Fixed removable prosthesis employing Marburg double crown system
Vijay Prakash, Hari Parkash, Ruchi Gupta
January-March 2008, 8(1):59-62
DOI:10.4103/0972-4052.43258  
The ultimate objective of the fabrication of a partial prosthetic appliance is the preservation of the remaining teeth while lost function is being restored. Double crown is an effective type of retainer that provides retention, support and a splinting action between multiple abutment teeth. Double crowns with clearance fit are used to retain tooth-mucosa and implant-supported removable partial dentures (RPDs). Retention is achieved by either functional molded borders or additional attachment. The double crown system retains dentures more effectively than do conventional clasp-retained RPDs, and also shows more favorable transmission of occlusal loading to the long axis of the abutment teeth. This case report will highlight the use of Marburg double crown system in the treatment of partially edentulous patients.
  - 3,559 611
EDITORIAL
Dental insurance
SJ Nagda
January-March 2008, 8(1):1-1
DOI:10.4103/0972-4052.43244  
  - 2,018 239
ORIGINAL ARTICLES
Effect of heat treatment on the microstructure and hardness of Ni-Cr base metal alloys
Ravindra Kotian, Swapna Philip Mariam, Supreetha Naik, Madhyastha Prashanthi
January-March 2008, 8(1):17-21
DOI:10.4103/0972-4052.43248  
This paper describes the effect of heat treatment on nickel-chromium (hereafter referred to as Ni-Cr) base metal alloys to evaluate the following features: (a) The microstructure and hardness of Ni-Cr base metal alloys in as-cast and after heat treatment condition and (b) The effect of firing temperature on the metal substructure of the restoration for the changes in the mechanical and microstructural properties during porcelain firing.
  - 2,155 269
Evaluation of variations in composition, corrosion behavior and surface hardness on reusing a Co-Cr-Mo denture alloy
Namburi S Kumar, Tripuraneni S Chandra
January-March 2008, 8(1):22-26
DOI:10.4103/0972-4052.43249  
We evaluated the variations in the surface composition, corrosion resistance and surface hardness of cobalt-chromium-molybdenum (Co-Cr-Mo) removable partial denture alloy on repeated usage until six generations by adding 50% of weight of fresh alloy pellets to the left-over button and sprue in the previous generation. Corrosion testing was performed with WenkingLB81M potentiostat to evaluate the anodic polarization behavior of the specimens from artificial saliva at room temperature. The breakdown potential for each generation was determined. Scanning electron microscope (SEM) evaluation of the corroded and uncorroded specimens was performed. Vickers hardness number (VHN) was evaluated using Zwick3212 micro hardness indenter with values ranging from 317 to 329 VHN. Surface composition of the corroded and uncorroded specimens was analyzed using X-ray energy dispersive analysis. The Mann Whitney U-test was used to analyze the numerical findings. The breakdown potential values for all six generations were recorded in between + 480 mV and + 500 mV. The hardness and composition showed variations among generations but were statistically insignificant. On the corroded surface, an increase in the Cr and Mo content and decrease in the Co content was observed. SEM photographs show a definite alteration in the surface topography at the corroded site. Within limitations, it was concluded that this alloy could be reused by adding 50% (by weight) of new alloy pellets without significant variation in the abovementioned properties.
  - 2,040 270
Dental periscope: A new device to examine the parallelism of abutment teeth
Pravinkumar G Patil, Rambhau D Parkhedkar
January-March 2008, 8(1):27-29
DOI:10.4103/0972-4052.43250  
The evaluation of the relative parallelism of two or more abutment preparations for fixed partial dentures with the help of a mouth or photographic mirror may encounter the errors. A dental periscope is a new device for examining the abutment preparations outside the mouth, which is otherwise difficult to judge intraorally. With the help of this device, the evaluation of relative parallelism of tooth or implant abutment preparations for fixed partial dentures will become more convenient. Axial preparations for individual inlay, onlay or crown also can be evaluated easily with this device.
  - 2,534 393
An in-vitro comparative study of wettability of four commercially available saliva substitutes and distilled water on heat-polymerized acrylic resin
Neelam Sharma, Vidya Chitre
January-March 2008, 8(1):30-35
DOI:10.4103/0972-4052.43251  
Statement of Problem: Water can be used as a saliva replacement, but it is not adequately effective in moistening and lubricating the oral mucosa. Good wetting of the denture base material by the saliva substitute is critical for optimum retention of the upper complete dentures. Purpose: The purpose of the study was to compare wettability of distilled water and four saliva substitutes on DPI heat cure acrylic resin. Materials and Methods: A total of 200 heat-cured acrylic samples were prepared of dimensions 2.5 × 1.5 × 2 mm. They were divided into five groups (40 samples in each group), and advancing and receding contact angles were measured using contact angle goniometer. Results: The obtained values for advancing and receding contact angle and the resultant value of angle of hysteresis were subjected to statistical analysis. ANOVA was performed, which showed statistically significant values. Conclusion: The wettability of saliva substitute aqwet was found to be better as compared to other saliva substitutes and distilled water on heat-cured acrylic resin used in the study.
  - 2,548 366
REVIEW ARTICLES
The golden proportion - God's building block for the world
Ravudai Singh, Kusum Datta
January-March 2008, 8(1):6-9
DOI:10.4103/0972-4052.43246  
The golden proportion has been known since a long time and is considered a proportion often cited as occurring frequently in nature. It has been described by many artists, mathematicians, scientists and philosophers. The proportion encompasses both living and nonliving entities; even artificial components and structures appear to be directed to conform to the golden proportion. It appears that humans are genetically programmed to recognize this proportion as pleasing since it explains beauty and is related to the science of numbers. The ideal proportion is related directly to the golden proportion that ranges from 1 to 1.618. The golden proportion is considered a universal standard for facial beauty, and its use may help simplify the diagnosis of facial and dental disharmonies, and treatment using this standard will help restore optimal facial esthetics.
  - 4,519 686
Prosthodontic rehabilitation of the posterior atrophic maxilla: Recent trends in sinus augmentation
Indu Raj, K Harshakumar, T Sreelal
January-March 2008, 8(1):2-5
DOI:10.4103/0972-4052.43245  
The posterior maxilla has been reported as the least predictable area for implant survival. The frontier of bone reconstruction, by sinus augmentation and graft placement, is vast and full of opportunities. Recent trends in sinus augmentation have been discussed in the present article.
  - 2,416 400
Prosthetic management of HIV/AIDS patients
Sanjna Nayar, S Binsu
January-March 2008, 8(1):10-16
DOI:10.4103/0972-4052.43247  
Human immunodeficiency virus (HIV) has been recognized as one of the most devastating infectious diseases of the century. This article delineates the specific recommendations associated with the protection against HIV, which includes barrier techniques; hand washing and care of hands; sterilization or disinfection of instruments; cleaning and disinfection of dental units and environmental surfaces; disinfection of the dental laboratory and the disposal of waste materials.
  - 3,607 678