https://ijdm.co.in/index.php/dental-materials/issue/feed International Journal of Dental Materials 2022-04-22T13:38:52+00:00 Dr. Rama Krishna Alla editor@ijdm.co.in Open Journal Systems <p align="justify"><strong>Focus and Scope: </strong>International Journal of Dental Materials welcomes editorial queries, original studies, evidence-based research works and practical innovations, reviews, case reports and concise communications. This journal intends knowledge transfer and spread of verified information from valuable researchers to all fellow dental fraternity. Manuscripts showcasing studies on dental biomaterial properties, performance, induced host response, immunology and toxicology will attain the highest priority for publication. Documentation emphasising advancing dental technology, innovations in dental materials design and their clinical viability succeed the hierarchy of publishing preference.</p> https://ijdm.co.in/index.php/dental-materials/article/view/90 Distinctive analysis of the shear bond strength of Porcelain Fused Metal substructure fabricated by conventional casting, direct metal Laser Sintering and CAD-CAM processing techniques 2021-12-28T16:14:37+00:00 R Usharani usharani844@gmail.com Ravalika N Kothuri ravalikakothuri@gmail.com Tejasvi Daram tejasvi.dharam28.td@gmail.com <p>Background: The use of metal-ceramic restorations began in the late 1950’s allowing the development of prosthetic rehabilitation with better cosmetic results replacing previously in-demand precious metals. These restorations are commonly prepared using conventional casting, Direct Metal Laser Sintering and CAD-CAM processing techniques. The present study has been attempted to perform a distinctive analysis of the shear bond strength of porcelain fused metal substructure fabricated by conventional casting, Direct Metal Laser Sintering and CAD-CAM processing techniques.<br />Materials and Methods: The present study follows an in-vitro study design. A total of 45 samples were prepared and divided into 3 groups (n=15 in each group): conventional casting, Direct Metal Laser Sintering and CAD-CAM groups. The shear bond strength of all the specimens was measured using Universal Testing Machine. The specimens were subjected to shear load at the metal-porcelain interface with increasing load and the crosshead speed of 2 mm/sec till the disc debonded completely. The debonded samples were observed under Scanning Electron Microscope to assess the kind of failure.<br />Results: The obtained data of three experimental group samples were analysed using the student’s t-test, One-way ANOVA test and Tukey’s Post-hoc test. Results of t-test showed that, of all the three techniques, Casting technique shows highest mean of force and shear bond strength, and this mean difference was significant. The same results were shown in One way ANOVA test and Tukey’s Post-hoc test.<br />Conclusion: From the observations of the present study, it can be stated that Casting technique showed highest mean of load and shear bond strength followed by the CAD/CAM method and DMLS technique, respectively. The results of this study ranged from 69-87MPa which is within the safety borders. Therefore, it can be concluded that all three methods can be used to fabricate the metal substructure in metal-ceramic restoration.<br />Keywords: CAD-CAM, Casting, Direct Metal Laser Sintering, Shear bond strength.</p> 2022-04-22T00:00:00+00:00 Copyright (c) 2022 International Journal of Dental Materials https://ijdm.co.in/index.php/dental-materials/article/view/92 Physical properties of dental plaster filled with marble powder: a pilot study 2022-01-24T04:02:15+00:00 Nidal Elshereksi nidalwanis@gmail.com Bushra L Alshabah nidalwanis@gmail.com Nadine M Abouod nidalwanis@gmail.com Retaj K Albahloul nidalwanis@gmail.com <p><strong>Background: </strong>Gypsum materials are frequently utilized in dental technology. Dental plaster is one of these products that is mainly used to produce dental casts and mounting purposes. Although the cost of dental plaster is very low, their inferior compressive strength, low abrasion resistance and dimensional instability restricted their usage as primary and working casts. The inclusion of different fillers in gypsum products could play an important role in improving their performance.</p> <p><strong>Aim: </strong>The aim of this study was to evaluate the physical properties of dental plaster incorporated with various concentrations of Marble powder (MP).</p> <p><strong>Methodology: </strong>Gypsum composites were prepared by incorporating 1.0, 3.0, 6.0 and 9.0 wt.% of MP. The neat plaster/mixture comprised the control group. The prepared gypsum composites samples were characterized in comparison with the control group. The density, porosity and fluidity of dental MP/plaster samples were investigated. The correlation between density and fluidity was also conducted.</p> <p><strong>Results: </strong>The gypsum composite samples displayed a higher density of 47% than the control group. However, a remarkable decrease in porosity level was observed as MP content increased. Significant improvements in the fluidity of the dental plaster after impregnating MP filler (<em>p</em>&lt;0.05) whereas there is no significant correlation between density and fluidity of gypsum composites (<em>p</em>&gt;0.05).</p> <p><strong>Conclusion: </strong>The concentration of MP in dental plaster is proportional to the density and fluidity of the material and inversely proportional to its porosity.</p> 2022-04-22T00:00:00+00:00 Copyright (c) 2022 International Journal of Dental Materials https://ijdm.co.in/index.php/dental-materials/article/view/94 Evaluation of effect of core build-up materials on fracture resistance of endodontically treated teeth 2022-01-24T04:06:46+00:00 Vijay Linju krishnalinju@gmail.com V. P Prabath Singh drprabathendo@gmail.com Hariharan Madhu hariharanmadhu@gmail.com Gayathri Presannakumar gayathri.presannakumar@gmail.com <p><strong>Background:</strong> Restoration of teeth after endodontic treatment is becoming an integral part of reconstructive dentistry.</p> <p><strong>Aim:</strong> The aim of this study was to evaluate the effect of different core build-up materials on fracture resistance of endodontically treated teeth.</p> <p><strong>Materials and methods</strong>: Freshly extracted forty permanent mandibular first molars were selected. Standardized access cavities were prepared, following which mesial canals were prepared up to F2 (8%25) and distal canals up to F3 (9%30) and obturated. The coronal portion of the specimen was altered by removing the mesial wall and retaining buccal, lingual and mesial walls of 2mm and distal 5mm girth. Ten specimens each were rehabilitated with high copper amalgam, type IX GIC, posterior composite and Alkasite as core build-ups. All the specimens were finally rehabilitated with a metal crown. The specimens were tested for fracture resistance using a universal testing machine under oblique (135<sup>o</sup> to the long axis of teeth) cyclic loading. The number of cycles taken to fracture and the fracture site was recorded. The results of mechanical cyclic loading to evaluate fracture resistance showed that composite core endured the maximum number of cycles to fracture followed by amalgam, Alkasite and type IX GIC.</p> <p>To test the statistical significance of the difference in mean value K<sub>IC</sub> among four groups, Kruskal-Wallis one-way analysis of variance was applied. Bonferroni’s multiple comparison test was performed to determine which group significantly differed from the others.</p> <p><strong>Results:</strong> From the results of this study, the composite was considered to be the best core build-up material. The newer material, Alkasite can bear stress almost to that of amalgam restoration.</p> <p><strong>Conclusion:</strong> This study suggests that Alkasite could be used as a core material for restoring the endodontically treated teeth.</p> 2022-04-22T00:00:00+00:00 Copyright (c) 2022 International Journal of Dental Materials https://ijdm.co.in/index.php/dental-materials/article/view/97 An overview of applications of PEEK polymer in prosthodontics. 2022-03-21T09:37:10+00:00 Mohammed Cheruvu Ashraf dr.mdashraf1994@gmail.com M Sujesh drmsujesh@gmail.com C Ravikumar dr.mdashraf1994@gmail.com A Rajanikanth dr.mdashraf1994@gmail.com Chalapathi Rao Duggineni dr.mdashraf1994@gmail.com K Sunitha dr.mdashraf1994@gmail.com <p>The rapid evolution of computer-aided design and computer-aided manufacturing (CAD-CAM) led to the introduction of newer materials that could be precisely milled for the fabrication of dental prostheses. PEEK (PolyEtherEtherKetone) has been explored for a number of applications for clinical dentistry, including removable dental prostheses, fixed dental prostheses, implant-supported prostheses, resin-bonded fixed dental prostheses and implant-retained overdentures. The major beneficial property of PEEK is its lower Young's modulus, and as elastic as bone, providing a cushioning effect and reduction of stress transferred to abutment teeth. It is a material with high biocompatibility, good mechanical properties, high-temperature resistance, chemical stability, polishability, good wear resistance, and high bond strength with luting cements. Further, PEEK is also recommended for a wide range of CAD-CAM fabricated fixed and removable prostheses, fabrication of occlusal splints, intra-radicular posts, implant abutments and provisional restorations. PEEK material shows a property of radiolucency, which is advantageous for the evaluation of both osseointegration and tissue surrounding the implant on computed tomography. Considering these properties, PEEK is increasingly being used in implantology.</p> 2022-04-22T00:00:00+00:00 Copyright (c) 2022 International Journal of Dental Materials https://ijdm.co.in/index.php/dental-materials/article/view/96 A comprehensive review on bonding between monolithic ceramics and tooth structure with different adhesive agents. 2022-03-21T09:39:26+00:00 Mamatha Dingari mamatha.d24.mm@gmail.com M Sujesh drmsujesh@gmail.com C Ravikumar mamatha.d24.mm@gmail.com A Rajanikanth mamatha.d24.mm@gmail.com Chalapathi Rao Duggineni mamatha.d24.mm@gmail.com G Harilal mamatha.d24.mm@gmail.com <p>Reliable bonding between the prepared tooth and monolithic ceramics can be achieved by various luting agents available on the market. The selection of luting agent and cementation technique plays an important role in the success of the restoration. With the advent of resin-based adhesive systems as luting agents, clinicians' perspectives have changed to a more conservative approach. Recent systems, chemically adhere the crowns to the prepared tooth structure showing higher bond strength. To reach the aesthetic demands of the patients, all-ceramic restorations were considered over metal-ceramic crowns. Few all-ceramic crowns are brittle, the strength is dependent on the chemical structure and method of fabrication. While some all-ceramic restorations gain strength after cementation. Thus, the choice of luting agent used in cementing all-ceramic crowns is crucial. Even though many luting agents are being introduced no single luting agent fulfilled all the requirements. Among them, adhesive cements showed greater bond strength and enhanced the retention of minimal preparation, which are less retentive. Traditional non-adhesive agents can be used in retentive preparations that bond through mechanical means rather than the chemical bond seen in newer adhesive cements. Also, surface treatments of zirconia showed greater bond strengths irrespective of the luting agent being used. These include air abrasion, acid etching, applying silane couplers, and primers that increase the surface area for adhesion. The use of all-ceramic restorations, the need for surface treatments, types of surface treatments, adhesion and adhesive agents, and evidence from current <em>in vitro</em> research on monolithic ceramics and tooth adhesion were all discussed in this review.</p> 2022-04-22T00:00:00+00:00 Copyright (c) 2022 International Journal of Dental Materials