International Journal of Prosthodontics and Restorative Dentistry

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2011 | October-December | Volume 1 | Issue 3

EDITORIAL

Editorial

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:1] [Pages No:0 - 0]

PDF  |  DOI: 10.5005/ijoprd-1-3-v  |  Open Access |  How to cite  | 

EDITORIAL

Virendra B Dhuru

Guest Editorial

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:1] [Pages No:0 - 0]

PDF  |  DOI: 10.5005/ijoprd-1-3-vii  |  Open Access |  How to cite  | 

RESEARCH ARTICLE

A Comparative Study on the Effect of Two Different Investing Mediums on the Movement of Artificial Teeth during the Fabrication of Complete Denture: An in vitro Study

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:6] [Pages No:141 - 146]

PDF  |  DOI: 10.5005/jp-journals-10019-1027  |  Open Access |  How to cite  | 

Abstract

Purpose

Acrylic processing of waxed-up dentures is considered to be a crucial and technique-sensitive procedure. Even after investing a lot of time and clinical skill a definitive movement of teeth during and after processing has long been observed which lead to occlusal discrepancies and disturb the harmonious occlusal scheme achieved earlier. Shifting of the teeth can occur as a result of the investing procedures and investing materials. The objective of this study was to evaluate and compare the movement of artificial teeth in two-dimensions of space (anteroposterior and mediolateral) during processing of the waxed-up dentures using two different gypsum materials for investing.

Methods

Two groups of 15 waxed-up maxillary dentures were processed using two different investing mediums (a) dental plaster and (b) combination of dental stone core and plaster mold. The artificial teeth movement was measured in the mediolateral and the anteroposterior directions between predetermined reference points before and after processing with the aid of a traveling microscope. The findings were statistically analyzed using parametric t-tests and ANOVA F-test.

Results

Artificial teeth movement in both the anteroposterior and mediolateral direction was less with the use of investment combination of dental stone core and plaster mold when compared to the conventional method of investing with dental plaster.

Conclusion

The dental stone core method is superior in view of the fact that it produces significantly less artificial teeth movement than the conventional method. However, neither of the investing methods is successful in completely preventing artificial teeth movement.

RESEARCH ARTICLE

Tarek Mohamed, Osama Abdulmoneam Baraka, Magdy Mostafa Badawy

Comparison between Acetal Resin and Cobalt-chromium Removable Partial Denture Clasps: Effect on Abutment Teeth Supporting Structures

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:8] [Pages No:147 - 154]

PDF  |  DOI: 10.5005/jp-journals-10019-1028  |  Open Access |  How to cite  | 

Abstract

Statement of problem

Acetal resin has been introduced as an esthetic partial denture clasp material. However, the effects of these clasps on the abutment teeth supporting structures were not clear.

Purpose

To evaluate the effects of acetal resin clasps on the abutment teeth supporting structures as compared to cobalt-chromium clasps.

Materials and methods

Twenty patients, 12 males and 8 females, with Kennedy class III modification I partially edentulous maxilla and dentulous mandibles were selected for this study. Patients were divided into two equal groups; group 1 received maxillary cobalt-chromium partial denture frameworks with acetal resin Akers clasps. Group 2 received maxillary partial denture with cobalt-chromium frameworks and Akers cobalt-chromium clasps. Crevicular fluid, epithelial attachment loss, and bone height and density of the abutment teeth were evaluated at partial denture insertion and after 6 and 12 months. Paired t-test was used at p ≤ 0.05 to assess the changes in the above parameters in each group. Student t-test was used to compare between the two groups.

Results

Crevicular fluid measurements were significantly higher in the first group than that in the second group. There were no differences in epithelial attachment loss between the two groups. There were significantly higher reductions in the bone height and in the bone density in the second group than that in the first group.

Conclusion

Acetal resin clasps were superior to cobalt-chromium clasps as produced fewer reductions in bone height and in bone density around the abutment teeth inspite of produced increase in the crevicular fluid.

Clinical implications

Since there were lesser reductions in bone height and in bone density around acetal resin clasp abutments, it could be used successfully to retain partial dentures. However, meticulous oral hygiene and proper insertion and removal of partial denture with acetal resin clasps were required to decrease gingival inflammation and crevicular fluid amount.

RESEARCH ARTICLE

Ajay Sharma, Lavanya Ajay Sharma, NS Azhagarasan, Chitra Shankar

Comparative Study of the Effect of Three Different Interocclusal Recording Materials on Reproducibility of Horizontal Condylar Registrations in Two Different Semiadjustable Articulators: A Clinical Study

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:8] [Pages No:155 - 162]

PDF  |  DOI: 10.5005/jp-journals-10019-1029  |  Open Access |  How to cite  | 

Abstract

Purpose

Simulation of jaw movements in an articulator requires one of the important condylar parameters, i.e. horizontal condylar inclination (HCI) to be registered in the patient and transferred to a mechanical device (articulator). The most popular and commonly used technique to determine horizontal condylar inclination (HCI) is by use of interocclusal records. Clinical studies comparing the effects of different interocclusal recording materials on reproducibility of protrusive settings in semiadjustable articulators have not been studied much. Hence, the present clinical study was conducted to comparatively assess the effects of three commonly used interocclusal recording materials; namely wax, polyvinylsiloxane, polyether in obtaining HCI values in two commonly used semiadjustable articulators; namely Hanau Wide-Vue (arcon) and Dentatus ARH type (non-arcon).

Materials and methods

One healthy female patient with intact dentition and no signs and symptoms of TMJ problems was selected for the study. With the help of a custom-made protrusive guide, 10 individual protrusive records for each of the interocclusal recording materials were made. These records were used for programming the two articulators and the respective HCI values were noted. The results obtained were tabulated and subjected to statistical analysis.

Results

The HCI values obtained using each of the interocclusal recording materials in both the semiadjustable articulators was found to be statistically significant. Among the materials polyether gave the highest values with less variability and wax gave low values with greater variation.

Conclusion

The results of this study indicate that HCI values vary both according to the type of interocclusal recording material employed and the articulator selected.

RESEARCH ARTICLE

Simel Tezcan Ayyildiz, Emine Çelik Bagci

Evaluation of Coronal Microleakage in Two Different Post-Core Systems

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:6] [Pages No:163 - 168]

PDF  |  DOI: 10.5005/jp-journals-10019-1030  |  Open Access |  How to cite  | 

Abstract

Aims

The aim of this in vitro study was to compare the cast metal and ceramic post-core systems, which have similar laboratory and clinical procedures according to coronal microleakage.

Materials and methods

Forty extracted maxillary anterior teeth were endodontically treated. Specimens were randomly assigned to four experimental groups (n = 10). The groups consisted of a cemented metal post-core group (CMPC), a not cemented metal post-core group (NMPC), a cemented ceramic post-core group (CZPC) and a not cemented ceramic post-core group (NZPC). A dual-cure resin cement (Panavia F) was used for both of the cemented groups. All specimens were stained with basic fuchsine and embedded in epoxy resin. Sagittal sections were obtained using a grinding machine and examined under binocular and coal microscopes. Coronal leakages were scored and data were analyzed using Kruskall-Wallis analysis of variance test.

Results

Results were compared between and within groups. No statistically significant differences were found between groups.

Conclusion

Cement alone is not sufficient to provide a barrier against microleakage in post-core restorations. The chosen post-core type or application methods may be more relevant to the leakage issue.

RESEARCH ARTICLE

Venkatesan Narayanan, Jayantha Padmanabhan

In vitro Comparison of Dimensional Stability of Stone Dies Obtained from Two Elastomers after Two Treatments

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:5] [Pages No:169 - 173]

PDF  |  DOI: 10.5005/jp-journals-10019-1031  |  Open Access |  How to cite  | 

Abstract

Aim

The aim of the study was to compare the dimensional stability of dies obtained from addition silicone and polyether impressions that were reheated or subjected to vacuum treatment.

Materials and methods

A master die was constructed of a rectangular stainless steel block on to which a photosensitive nylon printing plate attached which contains engraved test grooves. A custom-tray was fabricated and impressions were made using addition silicone and polyether before and after the two treatments. A total of 90 impressions and dies were made from both the elastomers and divided as control group, group I (reheated impressions) and group II (vacuum-treated impressions). A comparative analysis was done to determine which dies yielded the best dimensional accuracy compared to that of the master die.

Results

The minimum percentage dimensional change was observed in test dies made from addition silicone impressions of group I (reheated impressions), followed by the test dies made from polyether impressions in control group. The maximum percentage dimensional change was observed in test dies made from polyether impressions in group I (reheated impressions), followed by the test dies made from addition silicone impressions in group II (vacuum-treated impressions).

Conclusion

The dies obtained from reheated addition silicone impressions yielded the best dimensional stability overall when compared with that of the master die. The dies made of polyether impressions after reheating were not clinically acceptable, because of its hydrophilic nature swelled when they were reheated in a water bath.

CASE REPORT

Nettemu Sunil Kumar, Nettem Sowmya

Tissue Replacement Gingival Prosthesis in the Treatment of Esthetic and Functional Deficit: An Atypical Case Report

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:3] [Pages No:174 - 176]

PDF  |  DOI: 10.5005/jp-journals-10019-1032  |  Open Access |  How to cite  | 

Abstract

Tissue replacement gingival prosthesis is a simple, noninvasive procedure employed to replace large volumes of lost soft tissue architecture while overcoming the pitfalls of surgical treatment modalities. A removable gingival prosthesis has a definite set of superior advantages compared to the extensive surgical treatment options or the employment of a fixed prosthesis. The removable gingival prosthesis helps to render an esthetically pleasing and functional restoration which is economical and less time-consuming for patients who report with large areas of esthetic and functional deficits. This case report highlights the fabrication of a light-weight design of removable gingival veneer to effectively mask the large area of tissue distortion whilst achieving superior esthetics.

CASE REPORT

Tapas Gupta, Ardhendu Banerjee, Saurav Banerjee, Nabarun Chakraborty, Rajwinder Singh

Full-mouth Rehabilitation of a Patient with Severe Attrition using Hobo Twin-Stage Procedure

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:5] [Pages No:177 - 181]

PDF  |  DOI: 10.5005/jp-journals-10019-1033  |  Open Access |  How to cite  | 

Abstract

Excessive occlusal wear can result in pulpal injury, occlusal disharmony, impaired function and esthetic deformity. Loss of anterior guidance can result from severe wear of anterior teeth, which protects the posterior teeth during excursive movement. The collapse of posterior teeth also results in the loss of normal occlusal plane and the reduction of the vertical dimension. This clinical report describes the use of Hobo Twin- stage procedure for rehabilitation of a patient with severe tooth wear, resulting in reduced VDO.

REVIEW ARTICLE

Vinaya Bhat, Harshitha Alva, D Krishna Prasad, Manoj Shetty

Clinical Implications of Regressive Alterations of Teeth and their Management

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:4] [Pages No:182 - 185]

PDF  |  DOI: 10.5005/jp-journals-10019-1034  |  Open Access |  How to cite  | 

Abstract

Conclusion and clinical implications

This article describes the etiological factors and assists the readers in reaching a diagnosis on the type of lesion and their appropriate management.

Abbreviations

NCCL: Noncarious cervical lesion; VDO: Vertical dimension at occlusion; RMGIC: Resin-modified glass ionomer cement.

REVIEW ARTICLE

Satheesh Simha Reddy Panga, Ravi Sekhar, Raja Sekhar

Diagnosis and Treatment Modalities for Temporomandibular Disorders (Part I): History, Classification, Anatomy and Patient Evaluation

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:6] [Pages No:186 - 191]

PDF  |  DOI: 10.5005/jp-journals-10019-1035  |  Open Access |  How to cite  | 

Abstract

Temporomandibular disorder (TMD) is not just one disorder, but a group of conditions, often painful, that affect the temporomandibular joint, and the muscles that control chewing. Many psychological and physical factors cause myofascial pain, internal derangement of the joint, degenerative joint diseases which ultimately leads to temporomandibular disorder. Scientists are exploring how behavioral, psychological and physical factors may combine to cause temporomandibular disorders and researchers are working to clarify temporomandibular disorders symptoms, with the goal of developing easier and better methods of diagnosis and improved treatment. In part 1 of this 2-part series on temporomandibular disorders, emphasis will be placed on the history and classification of temporomandibular disorders, structure and function of the temporomandibular joint (TMJ), and patient evaluation techniques.

REVIEW ARTICLE

Satheesh Simha Reddy Panga, Ravi Sekhar, G Raja Sekhar, Soumya Tupili

Diagnosis and Treatment Modalities for Temporomandibular Disorders (Part II)

[Year:2011] [Month:October-December] [Volume:1] [Number:3] [Pages:4] [Pages No:192 - 195]

PDF  |  DOI: 10.5005/jp-journals-10019-1036  |  Open Access |  How to cite  | 

Abstract

Once proper patient evaluation techniques have been implemented and a working differential diagnosis has been created, the clinician can start treatment planning for the temporomandibular disorder (TMD) patient. This is not an easy task, primarily due to the wide array of treatment options currently available. In the second and final part of this article, focus will be placed on various treatment modalities for temporomandibular disorders.

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