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  Citation statistics : Table of Contents
   2008| April-June  | Volume 8 | Issue 2  
    Online since October 27, 2008

 
 
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ORIGINAL ARTICLES
The third point of reference and its effect on the protrusive condylar guidance angles obtained in semi-adjustable articulator
Deviprasad Nooji, Suresh MC Sajjan
April-June 2008, 8(2):71-77
DOI:10.4103/0972-4052.43589  
Context: Clinicians have questioned the transferability of occlusal plane relationship from the patient to the articulator when Orbitale was used as anterior point of reference for the facebow transfer. Aims: The aim of this study was to evaluate the effect of 4 different anterior reference points on the protrusive condylar guidance angles in using an articulator. Settings and Design: Twelve dentate patients were selected for the study. Hanau Wide Vue (No. 183, Teledyne Water Pik, Fort Collins, Colorado, USA) and corresponding SpringBow (Teledyne Water Pik, Fort Collins, Colorado, USA) were used in the study. Materials and Methods: Four maxillary casts were obtained for each patient and mounted on a Hanau Wide Vue articulator with the help of a SpringBow using Orbitale, Orbitale minus 7 mm, and the inferior and superior annular notches of the articulator incisal guide pin as four points of references. The mandibular casts were hand articulated in the maximum intercuspal position. Protrusive records were made using Polyether Bite Registration material (Ramitec, 3M ESPE, St. Paul, MN), and the articulator was programmed for all the 4 mountings in each patient. The protrusive condylar path angles to Frankfort plane were obtained from lateral cephalometric tracings made in maximum intercuspation and protrusive position for comparison. Statistical Analysis Used: Statistical analysis was done using paired t test and Wilcoxon's signed rank test ( P < 0.05) to make a comparison between the protrusive condylar guidance angles obtained from the interocclusal records with the mountings using 4 different third points of references and those of radiographic tracings. Results: The protrusive condylar guidance values obtained on the casts related to the third point of reference with the superior annular notch and Orbitale minus 7 mm reference points differed significantly from the radiographic values ( P < 0.05). The mean protrusive condylar guidance angles differed from the mean radiographic values in an ascending order: inferior annular notch (-2.4 degrees), Orbitale (5.2 degrees), Orbitale minus 7 mm (13.1 degrees), and superior annular notch (17.0 degrees) respectively ( P < 0.05). The protrusive condylar guidance registrations for the right and the left sides on the casts related to the third point of reference with Orbitale (R = 41.8 degrees and L = 36.9 degrees) and inferior annular notch (R = 49.4 degrees and L = 44.8 degrees) were found to be closer to radiographic values (R = 47.0 degrees and L = 41.0 degrees) ( P < 0.05). Conclusions: Within the limitations of this study, the Orbitale and inferior annular notches were found to be more accurate anterior points of references than the superior annular notch and Orbitale minus 7 mm reference points to mount the casts in Hanau Wide Vue articulator using Hanau SpringBow.
  6 12,625 1,687
CLINICAL REPORTS
Use of acrylic resin base as an aid in retaining silicone orbital prosthesis
Satyabodh S Guttal, Narendra P Patil, Ramesh K Nadiger, KB Rachana, Dharnendra , Narendra Basutkar
April-June 2008, 8(2):112-115
DOI:10.4103/0972-4052.43615  
Orbital defects with total loss of eyelids and eyeball cannot be satisfactorily repaired by reconstructive surgery. While prosthetic replacement is the treatment of choice owing to its acceptable and life-like appearance, retention of the orbital prosthesis is an important factor for success of the prosthesis. This paper describes a technique for retention of silicone orbital prosthesis using acrylic resin base, wherein the latter is attached to the eyeglass frame.
  5 3,818 463
Prosthetic rehabilitation of a patient with an orbital defect using a simplified approach
Supriya Manvi, Bilquis Ghadiali
April-June 2008, 8(2):116-118
DOI:10.4103/0972-4052.43616  
The rehabilitation of facial defects is a complex task requiring a specific design of the technique to be used in individual patient. The disfigurement associated with the loss of an eye can cause significant physical and emotional problems. Various treatment modalities are available, one of which is implants. Although implant orbital prosthesis has a superior outcome, it may not be advisable in all patients due to economic factors. The present article describes a simplified technique for the fabrication of a silicone orbital prosthesis by modifying a stock ocular prosthesis to achieve ideal fit and esthetics. Multidisciplinary management and team approach are essential in providing accurate and effective rehabilitation.
  5 4,004 500
ORIGINAL ARTICLES
In vitro evaluation of transverse strength of repaired heat cured denture base resins with and without surface chemical treatment
Shreya Siddesh Colvenkar, Meena A Aras
April-June 2008, 8(2):87-93
DOI:10.4103/0972-4052.43592  
Purpose of Study: Denture repair involves joining two parts of fractured denture with a denture repair material. The success of denture repair relies on the phenomenon of adhesion. Polymer surface can be etched by appropriate chemical, which changes the morphology and chemical properties of surface and promotes better adhesion. Taking into account the importance of adhesion in denture repair, the study was designed to evaluate and compare the transverse strength of repaired conventional, high-impact and glass fiber-reinforced heat cure denture base resins with and without surface chemical treatment with ethyl acetate and methylene chloride. Methodology: The study was conducted by surface treatment of different denture base resins (conventional, high impact, and glass fiber) with different chemicals (ethyl acetate and methylene chloride), with control group formed without surface chemical treatment. Specimens were repaired with autopolymerizing acrylic resin using 'sprinkle on' technique. The testing of the transverse strength of the repaired specimen was carried out on universal testing machine. Principal Conclusion: The study revealed that surface chemical treatment with methylene chloride and ethyl acetate improved the transverse strength of repaired heat cure denture base when compared with control group. The glass fiber subgroup with methylene chloride surface treatment is recommended as the combination possessing the most superior transverse strength among the various combinations.
  3 3,272 418
The evaluation of flexural strength and impact strength of heat-polymerized polymethyl methacrylate denture base resin reinforced with glass and nylon fibers: An in vitro study
Sanjiv Rajender Dagar, Ashok J Pakhan, RU Thombare, Bhagwandas K Motwani
April-June 2008, 8(2):98-104
DOI:10.4103/0972-4052.43612  
With the advent of newer denture base materials, fiber reinforcement in polymethyl methacrylate (PMMA) acrylic resin by various fibers to improve the strength properties of PMMA denture base materials is common nowadays. So it has become imperative to evaluate which fiber suits best to improve both flexural and impact strengths of the denture base resin and to know up to what extent the fiber-reinforced PMMA denture base resin fulfills the strength requirement of an ideal denture base material. This study compared the resistance-to-fracture properties of a commercially available heat-polymerizing PMMA denture base resin with those of the same material reinforced by glass and nylon fibers. The fibers were randomly oriented and used in concentration of 2% by weight. The 20 test specimens of similar dimensions were prepared for each of the 4 experimental groups, viz., conventional PMMA denture base resin; and the same resin reinforced with monomer-treated glass fibers, silane-treated glass fibers, and monomer-treated nylon fibers. A total of 10 test specimens from each study group were subjected to three-point bend test on a Universal Instron testing machine, and the remaining 10 test specimens were tested for impact strength by Charpy's pendulum impact strength tester. From the literature, it was found that the flexural and impact strengths of heat-polymerized PMMA denture base resin reinforced with fibers are significantly more than those of the conventional heat-polymerized PMMA denture base resin.
  2 3,496 429
Prosthodontic management of a patient with limited mouth opening: A practical approach
Rahul Prasad, SV Bhide, PV Gandhi, NS Divekar, VNV Madhav
April-June 2008, 8(2):83-86
DOI:10.4103/0972-4052.43591  
Dentists occasionally come across patients with constricted oral openings. As the size of the oral opening decreases, the difficulty of the required treatment increases. A maximal oral opening that is smaller than the size of a complete denture can make prosthetic treatment challenging. Several techniques have been described for such situations, where either standard impression trays or the denture itself becomes too difficult to place and remove from the mouth. The literature contains various reports on the fabrication of sectional or hinged tray/complete dentures, utilizing various mechanisms for connecting each of the components. A case report and technique of a simplified and practical design for fabrication of mandibular/maxillary sectional trays and complete denture have been presented here; this technique utilizes components that are commonly available, to simplify the treatment modality of limited oral access to the prosthesis.
  1 4,946 921
REVIEW ARTICLE
Prosthetic management of ocular defect: Esthetics for social acceptance
Farhan K Shah, Himanshu Aeran
April-June 2008, 8(2):66-70
DOI:10.4103/0972-4052.43588  
It is quite usual for a person to have a natural eye removed as a result of a severe trauma; congenital abnormality; or disease such as an infection, a tumor or untreatable painful glaucoma. In such situations, the natural eye is removed by an acceptable medical procedure, for example, by enucleation or evisceration. It is also usual for a person to have a smaller than normal or phthisical eye that is blind. An ocular prosthesis is created to restore a more normal anatomical structure and the cosmetic defect created by these conditions in a person. The initial step in creating this prosthesis is the preparation of an impression of the ocular socket. From this impression, an ocular prosthesis is created that simulates a person's natural eye and is inserted into the ocular socket posterior to the lids and anterior to the orbital implant or phthisical globe. With such a procedure, a person's psychological trauma associated with the loss of the eye is reduced, and a more cosmetically acceptable appearance results from the use of these prostheses. Although implant eye prosthesis has a superior outcome, due to economic factors it may not be advisable in all patients. Therefore, a custom-made ocular prosthesis is an excellent alternative. Here, we present a case of a custom- made ocular acrylic prosthesis, which showed excellent fit, retention and esthetics. These prostheses usually comprise a scleral region with veins, an iris, a pupil and a clear corneal layer.
  1 3,930 625
CLINICAL REPORTS
Rehabilitation of a patient with partial glossectomy
Dilip Dhamankar, Janani Mahadevan, Arun Gupta
April-June 2008, 8(2):119-121
DOI:10.4103/0972-4052.43617  
One of the most challenging complications in maxillofacial prosthetics is the rehabilitation of the patient who has lost all or a part of the tongue. Such patients have difficulties with deglutition, mastication, speech and saliva control. Dysfunction in swallowing is also a problem, and it often contributes to nutritional deficiency.
  - 4,609 481
Natural tooth pontic: A temporary immediate provisional for a difficult esthetic situation
Anuj Chhabra, IV Rudraprasad, DB Nandeeshwar
April-June 2008, 8(2):122-125
DOI:10.4103/0972-4052.43644  
For each patient who requires extraction of anterior teeth, there are a multitude of treatment considerations. Cosmetic demands, functional needs, treatment sequencing, timeliness and affordability are some primary concerns that must be addressed on an individual basis. A patient will generally want a cosmetic and functional prosthesis at the earliest possible opportunity. Providing the most appropriate interim prosthesis for a given patient is both challenging and recording. Here, a clinical technique for immediate interim tooth replacement is being presented, utilizing the clinical crown to assist the clinician in providing an esthetically acceptable treatment option.
  - 4,103 473
Ersatz Gingiva
R Venkat, Gopi Naveen Chander, M Vasantakumar
April-June 2008, 8(2):126-130
DOI:10.4103/0972-4052.43646  
Artificial gingival substitution is a compliant entity for managing gingival recession conditions, where muco-gingival surgery is anticipated to produce less than sought-after outcome. Although there are illustrated methods of prosthetic gingival replacement in association with fixed partial dentures in literature, there is no accessible documented method in hand for gingival substitution in combination with removable partial dentures. This article will establish and state novel methods of artificial gingival substitution, in union with removable partial dentures. Three different modalities are depicted, each with a case report, thereby emphasizing the science, materials and techniques in the wake of each modality.
  - 2,702 423
Rehabilitation of auricular defect utilizing single implant and tissue support
Chethan Hegde, D Prasad Krishna, Prasoon Shukla, Manoj Shetty
April-June 2008, 8(2):105-107
DOI:10.4103/0972-4052.43613  
Predictable esthetic results coupled with survival rate being more than 95% has made implant supported auricular prosthesis as one of the most accepted modality to treat auricular defects. Use of two osseointegrated implants to achieve support is classically accepted treatment modality in alloplastic ear reconstruction. This case report deals with rehabilitation of congenital auricular defect utilizing single implant and tissue support.
  - 2,524 324
Prosthetic rehabilitation following segmental mandibulectomy
Pramod Raj Joshi, Gaganjit Singh Saini, Pratheek Shetty, Sudhakar G Bhat
April-June 2008, 8(2):108-111
DOI:10.4103/0972-4052.43614  
Mandibular defects caused by surgical intervention to eradicate or control disease frequently involve jaw resection. Loss of continuity of the mandible destroys the balance of the lower face and leads to decreased mandibular function by deviation of the residual segment toward the surgical site. Prosthetic methods advocated to reduce or eliminate mandibular deviation include intermaxillary fixation, removable mandibular guide flange prosthesis, implant-supported prosthesis, and palatally based guidance restorations. These methods and restorations would be combined with a well-organized mandibular exercise regimen. This clinical report describes the prosthetic rehabilitation following segmental mandibulectomy.
  - 4,302 667
EDITORIAL
IPS Vision 2020
SJ Nagda
April-June 2008, 8(2):65-65
DOI:10.4103/0972-4052.43587  
  - 2,540 305
ORIGINAL ARTICLES
A comparative evaluation of the effect of simulated porcelain firing cycle on the mechanical properties and microstructure of nickel-chromium-based ceramic alloys
Sanjay B Lagdive, Suresh Meshram
April-June 2008, 8(2):78-82
DOI:10.4103/0972-4052.43590  
The present study was carried out to evaluate the effect of porcelain firing cycle on the mechanical properties and microstructure of nickel-chromium-based alloys. Four different alloys were used: Supercast-np, d-Sign 10, Remanium CSe and Maxibond EMCS. Tensile bars and disks were prepared for testing according to specifications. For each alloy, ten tensile bars and six disks were prepared. For each alloy, five tensile bars and three disks were randomly selected for heat treatment. For heat treatment, the specimens were subjected to simulated porcelain firing cycle in a ceramic furnace. Both as-cast and heat-treated tensile bars were tested on a universal testing machine, and the values for the ultimate tensile strength, 0.2% offset yield strength and percentage elongations were obtained. Hardness was measured using Vickers's hardness tester. Microstructures were evaluated under an optical microscope. The data collected were tabulated and subjected to statistical analyses.
  - 2,556 241
Influence of cavity preparations and restorative procedures on stress distribution by finite element method
Floriano JC Bello, Carlos A Cimini Jr, Rodrigo C Albuquerque, Walison A Vasconcellos
April-June 2008, 8(2):94-97
DOI:10.4103/0972-4052.43611  
The influence of the preparation and restoration of cavities by using composite resin on the stress distribution of the upper central incisor was evaluated through a three-dimensional finite element method. Nine models were constructed. Model 1 was prepared with the enamel, coronary and radicular dentin, pulp and cortical and cancellous bones. In models 2 to 5, the dentin and enamel were removed to simulate interproximal and endodontic access cavity preparations and. In models 6 to 9, the preparations were restored with composite resin. All models were subjected to a 100-N static load with an inclination of 45 at a distance of 2.0 mm from the incisal edge of the palatal surface of the tooth. Compared to healthy teeth, the conservative interproximal cavity preparation resulted in an 80% increase in the maximum von Mises stress concentration, and in the endodontic access cavity, the stress concentration increased to 99%. In the extensive interproximal cavity preparations, the maximum stress concentration increase to 134% compared to that of healthy teeth and in the endodontic access cavity, the stress concentration increased to 173%. The stress concentration in the endodontic access alone increased to 116% compared to that of a healthy tooth. The values of stress concentration for extensive interproximal and two interproximal cavities, increased to 118% and 127%, respectively. It was concluded that the reduction in the dental structure led to an increase in the stress concentration. The biomechanical conditions for cavity restoration with composite resin have been established.
  - 2,495 270