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Effects of Thermal Cycling on Surface Hardness, Diametral Tensile Strength and Porosity of an Organically Modified Ceramic (ORMOCER)-Based Visible Light Cure Dental Restorative Resin
Published in P. Mereena Luke, K. R. Dhanya, Didier Rouxel, Nandakumar Kalarikkal, Sabu Thomas, Advanced Studies in Experimental and Clinical Medicine, 2021
VOCO, the Dentalists [13] claimed that they have developed a new radi-opaque light-curing composite, Admira Fusion which based on a nanohybrid silicate and ORMOCER technology with 1.25% polymerization shrinkage (volumetric)) is suitable for posterior and anterior restoration. Though the popularity of tooth-colored polymeric restorations is increasingly in dentistry, about half of the restorations have to be removed or replaced due to the failed restorations. The poor clinical performance of the restorative composite is due to various reasons. Polymerization shrinkage in the oral cavity, low monomer conversion, presence of residual monomer, cytotoxic effects of leachants, intensity of light, exposure time, shelf life of material food habits, bacterial infection and the handling characteristics have signifi-cant effect on the durability of restoration in the oral cavity. Current research [15] in dental materials reached from the traditional bioinert materials for restorative purposes to replace the decayed tooth to bioactive materials has a therapeutic function. As per the reported studies of Maktabi et al. [16], when the dental composite is placed in the oral cavity incrementally, the performance of the light-curing procedure is low, which leads to the formation of biofilm and secondary caries. Studies by Shimokawa CA [17] showed that microhardness of bulk-fill resin-based composites (RBCs) has a positive correlation on the performance of the light-curing unit by using four different light-curing units (LCUs. Microhardness is directly related to the monomer conversion.
Impact of Dental Caries on Survival of Polymeric Restorations
Published in Mary Anne S. Melo, Designing Bioactive Polymeric Materials for Restorative Dentistry, 2020
Maximiliano Sérgio Cenci, Tamires Timm Maske, Françoise Hélène van de Sande
The replacement of dental structure lost due to caries disease or injuries represents a large part of general clinical practice worldwide. Dental materials can reconstruct the tooth structure lost and restore the function and aesthetic of the dental element. Moreover, it is assumed that dental materials can also play an additional function, i.e., helping in the control of (secondary) caries lesion incidence in tooth surface (Cenci et al., 2008, 2009; Weir et al., 2012, 2017; Melo et al., 2013). Figure 3.5 exemplifies the target location of investigated developing bioactive materials. Overall, the remineralizing and antibacterial polymeric materials are intended to act at the interface tooth/restoration.
Community-Based Methods for Preventing Dental Caries and Periodontal Disease
Published in Lars Granath, William D. McHugh, Systematized Prevention of Oral Disease: Theory and Practice, 2019
These changes in patterns of oral diseases stem from a variety of causes, including broad social changes over the years.16 A better educated population, economic progress, more standardized middle class values, and mass communication have all led to improved attitudes and knowledge on oral health. Improved dental materials and techniques have combined with fundamental changes in the philosophy of dental practice to permit these attitudinal changes to be expressed in improved oral health status. Nations which have developed in this way through the 20th century have had the means to be able to apply a variety of community-based preventive programs. It is these prevention programs in a favorable social climate which have led to the observed changes in disease status. Economically developing countries, where population is usually growing rapidly and where social conditions are often less favorable, are not seeing the same reductions in disease rates.110
Interaction between microorganisms and dental material surfaces: general concepts and research progress
Published in Journal of Oral Microbiology, 2023
Yan Tu, Huaying Ren, Yiwen He, Jiaqi Ying, Yadong Chen
In the oral cavity, the biofilm containing the host and bacterial proteins apparently influences bacterial adhesion. Biofilm formation is a complex process, and factors such as dietary intake and oral microbial composition significantly affect it. Studying the association between the surface performance of materials and bacterial adhesion has shown that negatively charged, superhydrophobic, superhydrophilic, and nano surfaces can all reduce bacterial adhesion. In addition, some positively charged surfaces can achieve antibacterial performance through coating with antibacterial materials. The research and developments concerning new dental materials are more reliable in the simulated oral environment. Therefore, we should combine different models to simulate the complex oral environment to develop and evaluate novel dental materials. This research field has laid a solid foundation for a profound awareness of bacterial systemic sensing surfaces and is very critical for the research and development of intelligent biomimetic dental materials to reduce biological contamination.
Prediction of abrasive wears behavior of dental composites using an artificial neural network
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2023
Abhijeet Shivaji Suryawanshi, Niranjana Behera
Tobacco and artificial saliva were mixed in equal proportions to prepare a solution to immerse the pin specimens in it. A pH meter was used to measure the pH of the tobacco solution at room temperature (Sajewicz 2009). The pH of the solution was maintained constant throughout the immersion process. Table 1 summarizes the main compositions of the selected dental materials. The wear characteristics were evaluated after 2, 3.5, 6, 15, and 30 days of immersion, which represented the actual contact of material and tobacco solution for 1 week, 2 weeks, 1 month, 2 months, and 5 months, respectively. Testing of materials was carried out on artificial saliva only for recording the baseline reading. Figure 2 summarizes the wear of four composite materials at various immersion intervals (Suryawanshi and Behera, 2020; Suryawanshi and Behera 2021).
Physico-chemical and antimicrobial properties and the shelf life of experimental endodontic sealers containing metal methacrylates
Published in Biofouling, 2020
Victoria Burmann da Silva Guimarães, Andressa da Silva Barboza, Carlos Enrique Cuevas-Suárez, Tiago Collares, Thaís Larré Oliveira, Anderson Schwingel Ribeiro, Meibel Teixeira Lisboa, Fernanda Geraldo Pappen, Rafael Guerra Lund
Moreover, several adhesive systems were characterized according to a protocol for accelerated aging, simulating different shelf-life periods of the materials. According to ANSI standards, the shelf life of a material is the length of time (from the date of manufacture) a material retains the physical and mechanical properties necessary to accomplish its prescribed purpose. Dental materials are kept for long periods between different usages on a shelf or in the refrigerator. The degradation process of resin composites is complex and includes many aspects. Two major forms can be observed: intraoral degradation (mechanical, physical, or chemical) and extraoral degradation due to the storage of the material and its shelf life. Many materials used in dentistry are perishable and have specific storage requirements to maintain optimum properties and maximize their shelf life (Sabbagh et al. 2018). The results obtained suggested that the degree of conversion was affected after shelf-life simulation only for ETs, and film thickness was not affected after the simulation for any of the materials tested. The degree of conversion is a feature that is largely influenced by the type and concentration of the photoinitiator system. In this study, the experimental sealers were based on the CQ/EDAB photoinitiation system.