International Journal of Dental Materials 2021-05-15T05:23:34+00:00 Dr. Rama Krishna Alla 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> Obstructive sleep apnea: oral appliances and materials 2021-04-06T15:27:37+00:00 Srilekha Cheruku Chalapathi Rao Duggineni G Harilal Pavani Lukka <p>For the dental profession in general and in prosthodontists speciality, the subject of sleep medicine continues to offer great challenges and opportunities in diagnosis, treatment planning, and treatment based on qualitative evidence. Though the role contends by the prosthodontists is still in its infancy, there is a lot to find out and understand in the rapidly evolving field of sleep medicine because the recognition of co-managing patients with sleep disorders by the prosthodontists is quick changing into a reality. This article discusses the prosthodontic perspectives, particularly on obstructive sleep apnea.</p> 2021-05-15T00:00:00+00:00 Copyright (c) 2021 International Journal of Dental Materials Route maps for implant positioning: a review 2021-04-28T05:34:55+00:00 Manaswini Draksharapu Chalapathi Rao Duggineni C Ravi Kumar G Harilal <p>Dental implants are becoming a more common treatment choice in recent years, with an increasing number of patients preferring this option. Proper implant positioning is the most significant requirement for a successful implant treatment prognosis. A transfer system is necessary to ensure logical continuity between the diagnosis, prosthetic preparation, and surgical phases. Various techniques have been proposed for the fabrication of surgical guide templates in implant dentistry. This paper aims to review the associated literature and recent advancements in this field based on the design concept.</p> 2021-05-15T00:00:00+00:00 Copyright (c) 2021 International Journal of Dental Materials Evaluation of microstructure and mechanical properties of PMMA Matrix composites reinforced with residual YSZ from CAD/CAM Milling process 2021-04-03T16:44:11+00:00 Mahmut ÖZDOĞAN Ramazan Karslıoğlu <p><strong>Background:</strong> Reinforcement of dental acrylics with fillers has yielded positive results. Different proportions of fillers have been added to strengthen the dental acrylics, but no consensus has been reached.</p> <p><strong>Aim:</strong> The purpose of this study was to investigate the effects of the addition of different concentrations of yttria-stabilized zirconium (YSZ) obtained from the residues generated from the CAD-CAM milling of YSZ on the microstructure and mechanical properties of poly-methyl-methacrylate (PMMA)-YSZ composites.</p> <p><strong>Materials and methods:</strong> Composite materials with different amounts (0.0 to 70.0% by weight) of recycled YSZ reinforced PMMA resin matrix were produced. Scanning electron microscope (SEM), energy dispersive electron spectrometer (EDS) and Fourier Transform Infrared Spectrometer (FTIR) were used for microstructural analysis. Among the mechanical properties, the Vickers microhardness test method for hardness, 2D profilometer for surface roughness and composite densities were evaluated by Archimedes method. Data were analyzed using a one-way analysis of variance (ANOVA) at a pre-set alpha of 0.05.</p> <p><strong>Results:</strong> Microhardness and density increased until 60% by weight YSZ addition, while surface roughness remained unchanged but increased after 60% by weight YSZ addition. The addition of more than 60% by weight of YSZ caused agglomeration in the microstructures. The mechanical properties of poly-methyl-methacrylate decreased with more than 60% YSZ by weight.</p> <p><strong>Conclusion:</strong> Reinforcement of PMMA with residue zirconia powder will increase the usage chance of residue YSZ powder and provide a safer use of PMMA.</p> 2021-05-15T00:00:00+00:00 Copyright (c) 2021 International Journal of Dental Materials Evaluation of the tear strength, compressive resistance, and surface hardness of three commercially available bite registration materials: an in vitro study 2021-04-03T16:27:29+00:00 A Hariprasad Trailokya Narayan Dhir Samant HS Mohammed M Anand Syeda Ayesha <p><strong>Background</strong>: For making a successful prosthesis, it is essential to achieve harmony between the maxillomandibular relationship. The precision and occlusal quality of the prosthesis partly depends on interocclusal bite registration material. Interocclusal bite registration material plays an important role in recording and transferring of existing patient’s occlusal records. The procedure used to record and transfer interocclusal relation should be performed with the utmost care and understanding to prevent clinical error.</p> <p><strong>Aim</strong>: This study aimed to evaluate the tear strength, compressive resistance and surface hardness of three commercially available bite registration materials.</p> <p><strong>Material and Methods</strong>: Three types of commercially available bite registration materials, Bis-acrylate (BA), Polyvinylsiloxane (PVS), and Polyether (PE), were made in Dumbbell and cylindrical shaped samples to evaluate the tear strength and compressive resistance, respectively and were analysed using the universal testing machine. The surface hardness was assessed using a microhardness tester. The obtained data were subjected to statistical analysis using SPSS 16.0 version (Chicago, Inc., USA). ANOVA/Kruskal-Wallis test was used to compare study parameters among the groups. Tukey’s posthoc test was used for inter-group comparisons.</p> <p><strong>Results:</strong> Bis-Acrylate exhibited the greatest tear strength, followed by Polyvinylsiloxane and Polyether showed the least tear strength. More compressive resistance was observed in Polyether followed by Bis-Acrylate and lowest in Polyvinylsiloxane. A similar pattern was seen in the surface hardness among the three materials.</p> <p><strong>Conclusion</strong>: Bis-acrylate showed greater tear strength and surface hardness, and it can be considered a better bite registration material.</p> 2021-05-15T00:00:00+00:00 Copyright (c) 2021 International Journal of Dental Materials Repair bond strength of aged resin composite using different surface treatments and bonding protocols 2021-04-06T15:31:17+00:00 Pydiahnaidu Bandaru Nagesh Bolla Rupadevi Garlapati Sayesh Vemuri Yamini Bandaru <p><strong>Background:</strong> Repair of direct composites are less invasive than replacement, diminishing the risk of iatrogenic exposure of the pulp and the risk of detrimental to adjacent teeth, all in all, reducing the procession of the “restoration death spiral”.</p> <p><strong>Aim:</strong> This study aimed to evaluate the repair bond strength of aged resin composites using different surface treatments and bonding protocols.</p> <p><strong>Materials and Methods: </strong>A total of 45 discs (n=45) were fabricated of Nanohybrid composite measuring about 2.5 mm in height and 3.5 mm in diameter and were mounted in acrylic resin and subjected to 10,000 thermal cycles between 5-55 ? C with 30 seconds of dwell time in a thermocycler in order to simulate artificial ageing. All these samples were assigned into three groups (n=15) based on the surface treatment protocol. According to the bonding protocol, the samples in each group are further divided into three subgroups (n=5). After surface treatments of the aged composites, the application of bonding agent followed by new composite material was performed. All the samples were stored in distilled water at 37 ? C for 24 hours. The shear bond strength of the samples was measured using a universal testing machine at a crosshead speed of 1mm/min.</p> <p><strong>Results: </strong>Among the groups, the mean bond strength in medium grain diamond bur and 37% phosphoric acid etchant with the universal bonding agent subgroup was higher 852.56±27.71 than the remaining groups. The lowest mean bond strength of 200.9±10.62 was observed in 37% Etchant with direct composite subgroup.</p> <p><strong>Conclusion: </strong>Different combinations of surface treatments and bonding protocols affect shear bond strength differently. The highest shear bond strength values were achieved for the group where surface treatment was done with the combination of blue diamond bur and 37% phosphoric acid along with a universal bonding agent.</p> 2021-05-15T00:00:00+00:00 Copyright (c) 2021 International Journal of Dental Materials