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2005| October-December | Volume 5 | Issue 4
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REVIEW ARTICLE
Significance of the Frankfort mandibular plane angle in prosthetic management of partially or completely edentulous patients with Class II malocclusions
Veena Hegde
October-December 2005, 5(4):175-179
DOI
:10.4103/0972-4052.21631
Complete or partially edentulous patients with a skeletal class II skeletal jaw relationship due to a skeletal etiology comprise approximately 15% of the population with the two largest sub-categories being high and low FMA groups. Occlusal relationships in skeletal class II patients are often challenging because of arch size discrepancies which limits the potential occlusal contact area, steep guidance factors which can introduce occlusal interferences, and excessive range of motion which can complicate centric relation records. FMA determination provides a structure-function basis in selecting a scheme for occlusal reconstruction and should be incorporated in the treatment planning procedure as a major adjunctive diagnostic tool. The following treatise provides background information and treatment guidelines to facilitate improved prosthetic treatment for partially and completely edentulous skeletal class II patients.
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ORIGINAL ARTICLE
Clinical assessment of the overdenture therapy
RC Dhir
October-December 2005, 5(4):187-192
DOI
:10.4103/0972-4052.21633
A study was conducted to evaluate the clinical performance of tooth supported overdentures vis a vis. Conventional dentures. Forty two telescopic overdentures were constructed for thirty seven patients selected amongst the serving and retired defense personnel and their families. Most of such appliances constructed were lower complete overdentures. A general evaluation of this treatment modality was made against the conventional dentures routinely being provided simultaneously to other comparable cases. The results showed much better denture stability, improved retention, better patient acceptance, higher chewing performance, lesser post insertion sore spots, grossly reduced alveolar bone loss and shorter adjustment period in subjects provided with overdentures as compared to those provided with conventional dentures. The technique, though time consuming, was simple enough for execution in peripheral dental establishments having facilities for small castings. The overdenture therapy was found to be eminently suitable and rewarding for treating patients for whom full lower extractions and conventional complete dentures are planned.
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REVIEW ARTICLE
Changing face of infection control: Dental unit water lines
Shobha Rodrigues, V Shenoy, M Joseph
October-December 2005, 5(4):170-174
DOI
:10.4103/0972-4052.21630
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.
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ORIGINAL ARTICLE
Implant Prosthodontics: An in-vitro photoelastic stress analysis
M Srinivasan, TV Padmanabhan
October-December 2005, 5(4):193-199
DOI
:10.4103/0972-4052.21635
Arguably the greatest controversy in implant dentistry is that of linking a natural tooth and an implant together in a fixed restoration. Some researchers have absolutely contradicted the inclusion of the two, while others have suggested different options such as design considerations in the restoration or in the implant itself. Further more an outcome of a situation in linking a periodontally compromised abutment with an implant in a restoration itself lacks investigation. The study was designed to evaluate stresses transmitted to supporting structures by a fixed partial restoration under different abutment situations using a rigid / movable connector in the prosthesis. Also to evaluate stresses transmitted and the outcome of linking a periodontally compromised abutment with the implant in a fixed restoration. Photoelastic models were fabricated depicting a partially edentulous posterior mandible. The situations depicted were of a completely tooth supported, tooth implant supported and a completely implant supported situations. 20% and 35 % periodontal damages were also incorporated in the anterior abutment in the models. The fixed restorations were fabricated with movable and rigid type connectors. Vertical point loads were applied on fixed points on the restoration and the transmitted stresses under different simulated situations of the study were then recorded and analyzed. The fringe orders were recorded photographically and the fringe orders were tabulated for interpretation. After thorough analysis of the results obtained the study concluded that it is indeed beneficial to connect natural tooth to implants in a fixed partial restoration and that the type of connector advocated is a rigid one. Also conclusive is the fact that periodontally compromised teeth can be integrated in the restoration in combination with an implant as a conservative treatment option. The use of non rigid connectors in any situation may be erroneous.
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Immediate implant placement in conjunction with a DFDBA graft and resorbable membrane: A 1-10 year retrospective clinical study
Ratnadeep C Patil, S Kanchan, K Ramanathan
October-December 2005, 5(4):203-207
DOI
:10.4103/0972-4052.21637
Context:
The use of immediate post-extraction implants presents several advantages in terms of reduction of surgical steps and time required to conclude the therapy. Particularly important is the possibility to minimize the bone loss that otherwise would occur in the physiologic healing of the alveolus.
Aim:
The purpose of this paper is to evaluate immediate implants placed with DFDBA grafts and resorbable membrane over a 10-year period based on parameters of stability, success rate, esthetics and functional integrity to evaluate predictability of this surgical technique.
Settings and Design:
Unicenteric, randomized clinical study.
Methods and Materials:
From Jan 1995 to Jan 2005, 81 immediate extraction implants were placed for 68 patients. 75 Stepped screw Frialit2, Friadent, Gmbh, Mannheim, Germany) implants and 7 Straight, Swiss-Plus self-tapping threaded implants (Zimmer, Centrepulse) were placed. Observation period ranged from minimum 6 months to maximum 10 years.
Statistical analysis used:
Descriptive statistics, Chi-square test and One-way Anova test were used for assessing survival rates by comparing various variables like bone quality, bone quantity, implant sizes, implant site and problems encountered during and after surgery.
Results:
The 10-year survival rate was 98.76%. Majority of the implants placed showed diameter and length equal to or more than root size.
Conclusions:
Immediate implant placement has helped solve issues with regard to bone quantity, quality and esthetics as also treatment time, as opposed to delayed implant placement. Needless to mention is the instant gratification it provides the patient.
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REVIEW ARTICLE
Recent advances in the modelling of extraoral defects
AM Bhat
October-December 2005, 5(4):180-184
DOI
:10.4103/0972-4052.21632
Maxillofacial prostheses are usually fabricated on the basis of conventional impressions and techniques. The extent to which the prosthesis reproduces normal facial morphology depends on the clinical judgment and skill of the individual fabricating the prosthesis. Recently, as a result of advances in technology, various computer-aided design and manufacturing techniques have been successfully introduced for the automated fabrication of maxillofacial prostheses. These systems are able to provide more consistently accurate reproduction of facial morphology. This article reviews literature concerning such methods. Peer-reviewed literature published in the English language between 1988 and 2005 obtained using Medline and hand searches is reviewed and the various techniques involved in the automated fabrication of extraoral prostheses are described. The advantages as well as the limitations in the currently available techniques and the current body of knowledge are identified and directions for future research have been discussed.
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The macboyle retainer
Vivek V Nair, KN Velayudhan Nair
October-December 2005, 5(4):185-186
DOI
:10.4103/0972-4052.21634
The Mac Boyle retainer should be employed only under the most favourable conditions and when workmanship is of the highest order. When a Mac Boyle retainer is constructed by one who understands its limitations and does not exceed its potentialities, the prosthesis will have a surprisingly long life. When its use can be justified, minimal tooth surface is covered by metal. It is akin to the partial veneer crown, but the preparation is not so deep and the retention is derived from grooves at the labial line angles instead of on the proximal surfaces.
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CASE REPORT
Pierre robin syndrome: Rehabilitation of a neonate for nursing with palatal obturator
Nipa V Thakkar, MJ Bhatt
October-December 2005, 5(4):208-210
DOI
:10.4103/0972-4052.21638
Pierre-Robin Syndrome or anomalad is a congenital abnormality characterized by cleft, micrognathia and glossoptosis. Feeding of a neonate with a complete cleft palate is a very difficult task. A multidisciplinary approach is required to manage the complex features involved in the case of such children and their families. Here, we are presenting a case of a one day old neonate having Pierre-Robin syndrome with complete cleft palate in whom we constructed a palatal obturator for feeding.
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ORIGINAL ARTICLE
Efficacy of slurry water
Bhakti Doshi, SA Gangadhar
October-December 2005, 5(4):200-202
DOI
:10.4103/0972-4052.21636
Aims:
1) To study the effect of slurry water on surface of gypsum cast at different time intervals. 2) To study the effect of tap water on surface of gypsum cast at different time intervals. 3) To compare the effect the slurry and tap water on surface of gypsum cast at different time intervals.
Methods and Materials:
Seventy specimens of dental stone were prepared with central longitudinal groove and horizontal groove. Specimens were immersed up to central horizontal groove in tap water and slurry water for 15min, 30min, 60min, and 120min then specimens were removed and observed under stereomicroscope with respect to clarity of the groove.
Results:
1) Significant difference was present between specimens of slurry water group and tap water group in relation to the time intervals. 2) Tap water group specimens get affected when immersed for 15min also however there were no change in slurry water group specimen kept for 30 min. 3) Along the loss of continuity of groove, there was color change and loss of surface roughness was present in specimens, which were immersed in tap water for 60 min and120min. Such changes were not observed in slurry water group specimens.
Conclusion:
Slurry water dissolves the surface of gypsum cast less than tap water so to maintain the accuracy of the cast and the indirectly the prosthesis, use of slurry water is must.
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EDITORIAL
Research ethics
SJ Nagda
October-December 2005, 5(4):169-169
DOI
:10.4103/0972-4052.21629
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rd
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