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Access Statistics 2014 | September-December | Issue 3

 

CASE REPORT
Pravinkumar G Patil, Smita Nimbalkar Patil, Vaibhav Karemore

Mandibular Implant-supported Overdenture as an Occlusion-guide for Maxillary Fixed Implant Prosthesis: A Clinical Report

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:109-113]


ABSTRACT

Unlike natural teeth, osseointegrated implants react biomechanically in a different fashion to occlusal load due to lack of the periodontal ligament. Hence, the dental implants may be more prone to occlusal overloading, which is often regarded as one of the potential causes for peri-implant bone loss and failure of the implant/implant prosthesis. Stability of the intercuspal position and reduction of lateral forces are important aspects when providing occlusal equilibration for implantsupported prosthesis. Multiple missing teeth in maxillary and mandibular arches with disturbed occlusal plane due to long-term edentulous condition and overeruption of remaining teeth into the edentulous spaces is the challenging clinical situation. This article describes the management of a patient with multiple missing teeth in both the arches with mandibular implant-supported overdenture and maxillary implant supported fixed prosthesis. The sequence of the treatment planning is highlighted to manage the complex situation to achieve the best predictable occlusion.

Keywords: Dental implants, Implant-supported overdentures, Implant restorations, Occlusion, Full mouth rehabilitation.

How to cite this article: Patil PG, Patil SN, Karemore V. Mandibular Implant-supported Overdenture as an Occlusionguide for Maxillary Fixed Implant Prosthesis: A Clinical Report. Int J Oral Implantol Clin Res 2014;5(3):109-113.

Source of support: Nil

Conflict of interest: None

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RESEARCH ARTICLE
Nitin H Dani, Chaitanya Pradeep Joshi, Vaibhavi H Bhatt, Dinkar P Khanna, Smita U Khedkar

Reversal of Subgingival pH by Ascorbic Acid: A Weapon against Periopathogens

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:99-104]


ABSTRACT

Background: Periodontal pocket is a dynamic environment. Several interacting factors within this microenvironment play an important role in initiation and progression of periodontal diseases. Power of hydrogen (pH) is one of the important governing factor. Evidence suggests that pH of healthy gingival sulcus is between mildly acidic to neutral. A shift toward alkaline pH is observed in periodontal pocket which favors growth of gram-negative periopathogenic bacteria. Thus, the aim of the current study is to assess possible role of ascorbic acid in reversing subgingival alkaline pH and to determine optimum concentration of ascorbic acid for bacteriocidal effects.

Materials and methods: Subgingival plaque samples from 37 generalized chronic periodontitis patients were collected. Growth inhibition of periodontal pathogens with four different concentrations of ascorbic acid was examined anerobically after 48 hours. Photometric analysis and disk diffusion method were employed to quantify inhibitory effects.

Results: Evidence obtained by both the methods demonstrated possible bactericidal activity of ascorbic acid at 5 mg/ml. At this concentration, ascorbic acid showed stronger pH dependent inhibition toward gram-negative periopathogens.

Conclusion: Ascorbic acid can inhibit growth of periodontal pathogens at high concentration. Subgingival vitamin C administration could lead to prevention of plaque induced diseases. Due to its acidic nature, it should be used cautiously around teeth but recommended for maintenance of implants.

Keywords: Ascorbic acid, Chronic periodontitis, Antiplaque agent.

How to cite this article: Dani NH, Joshi CP, Bhatt VH, Khanna DP, Khedkar SU. Reversal of Subgingival pH by Ascorbic Acid: A Weapon against Periopathogens. Int J Oral Implantol Clin Res 2014;5(3):99-104.

Source of support: Nil

Conflict of interest: None

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RESEARCH ARTICLE
Aditi Prasad, Laxman Rao

Comparative Evaluation of Dimensional Accuracy of Impression Techniques for Parallel Implants and Implants Placed with Angulation: An in vitro Study

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:92-98]


ABSTRACT

Objective: This study aims to measure and compare the accuracy of various implant impression techniques in specimens with parallel implants placed at 90° to the horizontal plane and at 75°.

Materials and methods: Polyether medium body (3M ESPE Impregum) was selected as the material of choice. Two metal samples with three lab analogs placed in each were used as the master models. One had implants placed at 90° to the horizontal plane, and the other at 75°. Ten impressions were made each of stock metal tray, closed custom tray and open custom tray techniques. Photographs were taken and measurements were made using Adobe Photoshop software. Intragroup comparisons were done using the analysis of variance (ANOVA) and one way t-test. Intergroup comparison was done using two way t-test.

Results: All the techniques studied showed some distortion and the difference had no statistical significance. However, closed custom tray technique gave better results for the 90° specimen, and open custom tray technique gave better results for the 75° specimen.

Conclusion: Within the limitations of this study, it can be concluded that provided operator error is minimized and guidelines are followed, it may be possible to achieve impressions of similar accuracy regardless of technique used. However, it was impossible to achieve a level of exactness that would ensure a completely passive fitting prosthesis.

Keywords: Dimensional accuracy, Implant, Implant angulation, Impression accuracy, Impression technique, Parallel implants.

How to cite this article: Prasad A, Rao L. Comparative Evaluation of Dimensional Accuracy of Impression Techniques for Parallel Implants and Implants Placed with Angulation: An in vitro Study. Int J Oral Implantol Clin Res 2014;5(3):92-98.

Source of support: Nil

Conflict of interest: None

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CASE REPORT
Josep Oliva, Xiva Oliva, Andrea Roig

Computer-aided Design/Computer-aided Manufacturing Protocol for Immediate Loading with Zirconia Implants

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:114-119]


ABSTRACT

Yttria-tetragonal zirconia polycrystal (Y-TZP) is a material globally accepted for restorative and implant dentistry. The patient’s increased demand for more biologic and esthetic materials has made metal-free treatment a routine in everyday dental practice. Zirconia implants have more recently appeared into our armamentarium and is today the treatment of choice for patients with metal allergies and other immune disorders that are related with metal sensitivities as well as esthetic demanding cases. The present case report describes the protocol used for immediate zirconia implants and immediate loading for the full-mouth rehabilitation using computer-aided design/computeraided manufacturing (cad/cam) technology.

Keywords: Zirconia implant, Ceramic implant, CAD/CAM, Immediate loading, Acid etched, Rough surface.

How to cite this article: Oliva J, Oliva X, Roig A. Computeraided Design/Computer-aided Manufacturing Protocol for Immediate Loading with Zirconia Implants. Int J Oral Implantol Clin Res 2014;5(3):114-119.

Source of support: Nil

Conflict of interest: Dr Josep and Xavi Oliva are the founders of the CeraRoot implant system.

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RESEARCH ARTICLE
Shruti Lakhanpal, Manoj Kumar Sundar, Shilpa Shetty

Comparison of Marginal Fit of Cast Implant Superstructure Pre- and Post-spark Erosion: An in vitro Pilot Study

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:105-108]


ABSTRACT

Objective: To assess and compare the marginal fit of screw retained three unit implant superstructure, before and after spark erosion.

Methodology: An experimental model was prepared on which three unit screw retained implant superstructure on two implant analogs (cortex system) was fabricated which was then subjected to spark erosion. Sheffield test (one screw test) was carried out to determine the passivity. Assessment of vertical discrepancy was carried out using stereomicroscopic images of the superstructure and implant analog junction pre- and post-spark erosion with the help of image J analysis software.

Results: The implant superstructure fabricated with the conventional casting method were fitting actively on the implant analogs indicating a negative Sheffield test. However, following spark erosion passive fit was achieved. The marginal fit of the cast implant superstructure measured from a reference point on the superstructure to the implant analog margin was 4324.56 µm before spark erosion and 4046.57 µm after spark erosion.

Conclusion: Spark erosion technology with further research can be used to maximum efficiency to obtain passive fit of implant superstructure.

Keywords: Spark erosion, Electric discharge machining, Passive fit, Cast implant superstructure.

How to cite this article: Lakhanpal S, Sundar MK, Shetty S. Comparison of Marginal Fit of Cast Implant Superstructure Pre- and Post-spark Erosion: An in vitro Pilot Study. Int J Oral Implantol Clin Res 2014;5(3):105-108.

Source of support: Nil

Conflict of interest: None

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RESEARCH ARTICLE
Arjun Krishnadas, Ramkumar Subramanian, G Giri

A Comparative Study to Assess the Quality of Bone following Ridge Augmentation with Autografts and Allografts: A Prospective Study

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:88-91]


ABSTRACT

Aim: The aim of this study was to investigate the quality of bone at the augmented site in the anterior maxilla and mandible.

Materials and methods: Ten patients with inadequate bone for implant placement were included in this study. Of these 10 patients with inadequate bone volume, five were chosen to be treated with autogenous bone grafts (AT) and rest five patients were treated with freeze dried corticocancellous allografts (AL). Three months following grafting, biopsies of the grafted area were obtained using a 3 mm trephine bur and were histologically evaluated.

Results: Histological analysis revealed areas of new bone formation with thick trabeculae with lacunae containing osteocytes in the autogenous group, whereas the allograft group showed segments of necrotic bone with empty lacunae. Although, the AL group has an inherent advantage of avoidance of a secondary surgical site, showed decreased bone remodeling as compared to the autografts.

Conclusion: All the 10 patients underwent implant placement. The reports regarding the nature of bone obtained during implant placement clearly depicts a comparable histological variation at the grafted site.

Keywords: Autografts, Allografts, Ridge augmentation, Chin graft.

How to cite this article: Krishnadas A, Subramanian R, Giri G. A Comparative Study to Assess the Quality of Bone following Ridge Augmentation with Autografts and Allografts: A Prospective Study. Int J Oral Implantol Clin Res 2014;5(3): 88-91.

Source of support: Nil

Conflict of interest: None

752

Editorial
Gregori M Kurtzman

‘This is no longer Your Father’s Implant Dentistry!’

[Year:2014] [Month:September-December] [Volumn:5 ] [Number:3] [Pages:31] [Pages No:v]


ABSTRACT

‘This is no longer Your Father’s Implant Dentistry!’

The axiom ‘I placed the implant where the bone was’ is a dated concept in implant dentistry today, and no longer accepted as the ‘norm’. Osseous grafting has become an integral part of implant treatment, allowing ideal implant placement without the compromises we accepted in the past related to where the residual bone remained.

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