International Journal of Prosthodontics and Restorative Dentistry

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2018 | July-September | Volume 8 | Issue 3

EDITORIAL

Bruxism and Abutment-screw Loosening in Dental Implants

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:2] [Pages No:69 - 70]

PDF  |  DOI: 10.5005/jp-journals-10019-1207  |  Open Access |  How to cite  | 

EDITORIAL

Accuracies in Radiographic Evaluation of Crest Bone Changes Around Dental Implants

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:1] [Pages No:71 - 71]

PDF  |  DOI: 10.5005/jp-journals-10019-1208  |  Open Access |  How to cite  | 

RESEARCH ARTICLE

Delsaz Sultan, Robert L Engelmeier, Thomas Kunkel, Mohsen Azarbal

Computer-aided Design/Computer-aided Manufacturing Generated Ceramic Post and Core

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:7] [Pages No:72 - 78]

Keywords: Computer-aided Design/Computer-aided Manufacturing, Clinical restorative dentistry, Dental prosthodontics, Restoration

PDF  |  DOI: 10.5005/jp-journals-10019-1209  |  Open Access |  How to cite  | 

Abstract

Purpose: To evaluate the efficacy of computer-aided design/ computer-aided manufacturing (CAD/CAM) technology to fabricate an all-ceramic post and core restoration. Materials and methods: Two master dies fabricated from a polymer material were used in this study (Acadental T Endo TM series RT_AE 401_0®8). The coronal portion of the die simulated an ideal core preparation with a 1.5 mm to 2.0 mm ferrule. The intracanal space for the first and second dies were prepared for a post length of 10 mm and 14 mm respectively. Each die was scanned 20 times. A total of 40 e.max® CAD/ CAM post and core restorations were milled. The restorations were evaluated for a precision of fit by measuring marginal gap for each post and core restoration using scanning electron microscopy and by taking radiograph to determine the post length. Results: Results revealed that: (a) Chairside CAD/CAM Technology (Sirona CEREC BlueCam®) could produce directly all ceramic post and core restorations up to 10.0 mm of canal depth. (b) There was no pattern of relationship between the marginal gap and post lengths when comparing the two test groups. Conclusion: The least detectable gap was 5 microns, and the greatest was 100 microns. The marginal gap results found in this study met clinically acceptable standards.

RESEARCH ARTICLE

Rajat Dang, Veronika Dogra

Comparative Evaluation of Effect of Microwave Disinfection on Compressive and Diametral Tensile Strength of Various Type IV Dental Stones–An In Vitro Study

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:5] [Pages No:79 - 83]

Keywords: Compressive strength, Dental stone, Diametral tensile strength, Microwave irradiation

PDF  |  DOI: 10.5005/jp-journals-10019-1210  |  Open Access |  How to cite  | 

Abstract

Aim: To evaluate the effect of microwave disinfection on compressive and diametral tensile strength of various type IV dental stones. Materials and methods: In this study, a total of 160 samples of type IV dental stones were made using elite rock, denflo, Neelkanth and ultrarock each with dimensions of 40 mm in height × 20mm in diameter, which were later tested for compressive strength and diametral tensile strength. Samples were divided into two main groups: group A (compressive strength) and group B (diametral tensile strength) containing 80 samples each. Groups A and B is further divided into 8 subgroups which contain 20 samples each. Each subgroup is further divided into two minor subgroups: control and microwave irradiated containing 10 samples each. The diametral tensile strength and compressive strength of the samples were measured by a universal testing machine after seven times of frequent wetting, irradiating at an energy level of 600 W for 3 minutes and cooling. The data collected was tabulated and was subjected to statistical analysis using Statistical Package for the Social Sciences (SPSS) software. Results: Microwave irradiation resulted in a significant increase in compressive and diametral tensile strength of type IV dental stone. It was seen that out of all materials used, ultrarock was showing the maximum amount of change in both groups (compressive strength and diametral tensile strength). Conclusion: According to the results, microwave irradiation causes a significant increase in compressive strength and diametral tensile strength when compared with the control group.

RESEARCH ARTICLE

Omkar Shetty, Rahul S Patil

A Comparative Evaluation of Shear Bond Strength of Ceramic Fused to Metal Fabricated using Veneering and Pressable Techniques–An In Vitro Study

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:7] [Pages No:84 - 90]

Keywords: Instron, Metal ceramic, Pressable, Shear bond strength, Veneering

PDF  |  DOI: 10.5005/jp-journals-10019-1211  |  Open Access |  How to cite  | 

Abstract

Purpose: Evaluation of shear bond strength of ceramic fused to metal fabricated using veneering and pressable techniques. Material and methods: 10 metal disc samples were prepared in Ni-Cr base metal alloy and divided in two equal groups. Group A: conventional veneering of ceramic on metal-(leucite-glass-ceramic) and group B: pressing of ceramic on metal-(leucite-glass-ceramic). The shear bond strength between ceramic and metal bond was tested using custom-made jig assembly and Instron testing machine. Values obtained were evaluated and compared. Results: The results of this study showed that the mean bond strength values for veneering ceramic samples were 25.06 MPa which was higher than the mean bond strength values for press ceramic samples which was 21.68 MPa. Conclusion: Mean bond strengths differed between the two groups, indicating that the fabrication technique has an influence on the bond strength. The mean bond strength values for press ceramic were below the recommended standard International Organization for Standardization (ISO) value of 25 MPa for metal-ceramic bond whereas values for veneering ceramic were in a clinically acceptable range.

CASE REPORT

Su J Wong, Liang L Seow

Interdisciplinary Approach to correct Maxillary Anterior Single Tooth Crossbite with Fixed Dental Prosthesis

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:5] [Pages No:91 - 95]

Keywords: Anterior crossbite, Fixed prosthesis, Post and core, Removable appliance

PDF  |  DOI: 10.5005/jp-journals-10019-1212  |  Open Access |  How to cite  | 

Abstract

Anterior crossbite is an occlusal problem with functional and esthetic effects. To achieve normal occlusion and to preserve tooth structure, orthodontic appliances are commonly used, but in some clinical settings, a fixed prosthesis can be used as an alternative to the orthodontic appliance. A 33-year-old male came with esthetic concerns related to an anterior crossbite and missing tooth. He was fit and healthy. Intraoral examination revealed missing tooth 11, international caries detection and assessment system (ICDAS) code five mesial caries of tooth 12, anterior crossbite of tooth 22. The radiograph revealed periapical lesion at tooth 22 with a diagnosis of asymptomatic apical periodontitis and anterior crossbite. After discussion with the patient, the definitive treatment plan included oral hygiene instruction, caries control, non-surgical periodontal therapy; root canal treatment, orthodontic treatment for tooth 22 with Z-spring removable appliance due to his financial aspect as well as post and core, followed by four units porcelain-fused-metal bridge involving teeth 12, 21 and 22. Tooth 12 was restored with composite. Tooth 22 was root canal treated. Orthodontic treatment was unsuccessful. Post and core were done, followed by gingivoplasty. Abutment teeth 12, 21 and 22 were prepared and final impressions were taken. Provisional restoration was fabricated according to the diagnostic wax-up. The definitive restoration was assessed and cemented. Oral hygiene instruction and prosthesis home care were given. The patient was satisfied with the esthetic outcome of the treatment. The prognosis is fair. Patient\'s immediate esthetic demands could be achieved through restorative aspect.

CASE REPORT

Jayanta Bhattacharyya, Kritika Rajan, Ishan R Choudhury, Saumitra Ghosh

An Innovative Method for Fabricating a Closed Hollow Cast Partial Denture for a Patient with Mandibular Discontinuity Defect: A Case Report

[Year:2018] [Month:July-September] [Volume:8] [Number:3] [Pages:3] [Pages No:96 - 98]

Keywords: Cast partial denture, Hemimandibulectomy, Lightweight, Polystyrene

PDF  |  DOI: 10.5005/jp-journals-10019-1213  |  Open Access |  How to cite  | 

Abstract

Aim: Fabrication of lightweight dentures for hemimandibulectomy patients. Background: The discontinuity in case of a mandibular resection leads to decreased stability, retention and support of a prosthesis. The weight of the prosthesis is one of the primary dislocating factors because it often acts as a cantilever. To decrease the leverage action, reduction in the weight of the prosthesis is mandatory. Case description: In this case report the use of expanded polysterene (thermocol) has been done to increase the stability of the prosthesis, thereby, increasing the comfort and acceptance of the patient. Conclusion: This case report gives an insight as to how a lightweight material can be added to reduce the weight of denture, without compromising is integrity and function. Clinical significance: Lightweight materials such as expanded polystyrene (thermocol) allow control of spacer thickness to reduce the weight of the denture without compromising the integrity of the denture.

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