scholarly journals Mechanical Properties of Polymer-Based Blanks for Machined Dental Restorations

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7293
Author(s):  
Lucian Toma Ciocan ◽  
Jana Ghitman ◽  
Vlad Gabriel Vasilescu ◽  
Horia Iovu
Keyword(s):  
Mechanical Properties ◽  
Dental Materials ◽  
Clinical Problem ◽  
Morphological Properties ◽  
Dental Restorations ◽  
Wide Range ◽  
Cad Cam ◽  
Treatment Technologies ◽  
Restorative Dental Materials ◽  
Hybrid Ceramic

The tremendous technological and dental material progress led to a progressive advancement of treatment technologies and materials in restorative dentistry and prosthodontics. In this approach, CAD/CAM restorations have proven to be valuable restorative dental materials in both provisional and definitive restoration, owing to multifarious design, improved and highly tunable mechanical, physical and morphological properties. Thus far, the dentistry market offers a wide range of CAD/CAM restorative dental materials with highly sophisticated design and proper characteristics for a particular clinical problem or multiple dentistry purposes. The main goal of this research study was to comparatively investigate the micro-mechanical properties of various CAD/CAM restorations, which are presented on the market and used in clinical dentistry. Among the investigated dental specimens, hybrid ceramic-based CAD/CAM presented the highest micro-mechanical properties, followed by CAD/CAM PMMA-graphene, while the lowest micro-mechanical features were registered for CAD/CAM multilayered PMMA.

CAD/CAM Zirconia for Dental Application

2013 ◽  
Vol 320 ◽  
pp. 505-511
Author(s):  
Ning Li ◽  
Zhi Kai Wu ◽  
Chao Jian ◽  
Wan Qian Zhao ◽  
Jia Zhen Yan
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Key Words ◽  
20Th Century ◽  
Dental Materials ◽  
Tetragonal Zirconia ◽  
Dental Application ◽  
Cad Cam ◽  
Low Temperature Aging ◽  
Temperature Aging

During the 20th century, both dental materials and dental technologies for the fabrication of dental prosthesis progressed remarkably. Owing to the increased demand of safety and aesthetics, 3 mol% yttria stabilized tetragonal zirconia polycrystalline has been recently introduced in prosthetic dentistry for the fabrication of crowns and fixed partial dentures, in combination with CAD/CAM technique. This greatly changed the conventional dental laboratory work which is labor-intensive and experience-dependent. This review mainly introduced the state of dental zirconia and the application of CAD/CAM technology in dentistry. Key words: Dental Zirconia; CAD/CAM Technique; Mechanical Properties; Transformation Toughing; Low Temperature Aging;

scholarly journals Fabrication Technique of Dental Restoration Using Hybrid Ceramic With Cad Cam Method

2017 ◽  
Vol 1 (1) ◽  
pp. 32
Author(s):  
Meita Andriyani ◽  
Sonya Harwasih ◽  
Eny Inayati
Keyword(s):  
Ceramic Material ◽  
Load Capacity ◽  
Polymer Network ◽  
High Strength ◽  
Hybrid Structure ◽  
Dental Restoration ◽  
Hybrid Network ◽  
Dental Restorations ◽  
Cad Cam ◽  
Hybrid Ceramic

Background :  Ceramic is superior in aesthetic but fragile and breakable under bite pressure . Lack of understanding of material requirements for resistance in the oral cavity and minimal ceramic processing techniques is the initial cause of the failure. Hybrid ceramic dental restoration is a material that combines the good properties of ceramics and composites that have elasticity and ensures high strength and minimize the wall thickness of the restoration. Mechanical manufacture of dental restorations currently growing, CAD CAM systems are becoming popular in the field of dentistry. CAD CAM provides the advantage that the effectiveness of the time, does not require a lot of human resources, and produce a restoration with good quality. Purpose:  To explain hybrid ceramic material and techniques of making  hybrid ceramic dental restorations with CAD CAM system. Review: Hybrid ceramic is a material that combines the advantages of ceramics and composite elasticity. This material contains a hybrid structure with two networks, ceramic and polymer are linked to each other, known as double hybrid network. It added that the structure of the ceramic feldspathic network (86% wt) is reinforced by a polymer network (14% wt) are integrated as a polymer network filling cavities that exist in the network and make its structure ceramic hybrid ceramic material becomes denser. Conclusion: Hybrid ceramic having chewing load capacity and high elasticity, flexural strength  150-160 Mpa and fracture toughness 1.5 Mpa, higher than conventional ceramics. Mechanical manufacture of dental restorations using ceramic hybrid materials with CAD CAM method begins with scanning, selection of materials and tooth shade, designing, milling, followed by finishing, polishing, ends with staining and glazing.

scholarly journals Fracture Load of CAD/CAM Feldspathic Crowns Influenced by Abutment Material

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3407
Author(s):  
Mladen Bencun ◽  
Andreas Ender ◽  
Daniel B. Wiedemeier ◽  
Albert Mehl
Keyword(s):  
Mechanical Properties ◽  
Polymethyl Methacrylate ◽  
Fracture Load ◽  
Reinforced Composite ◽  
Computer Aided ◽  
Human Dentin ◽  
Cad Cam ◽  
Pairwise Contrasts ◽  
Hybrid Ceramic

In vitro studies investigating the mechanical properties of dental reconstructions use various materials to replicate prepared teeth. However, no uniform recommendation exists as to which material is most suitable for standardized testing. The purpose of this study was to identify a material that resembles human dentin in fracture load tests. Sixteen human teeth were scanned with an intraoral scanner to obtain copies of the original crown morphology and were then prepared for crowns. Replica dies of the prepared teeth including the root morphology were fabricated with a Computer-aided design and computer-aided manufacturing (CAD/CAM) system and divided into four groups: (A) reinforced composite (RC); (B) human dentin (HD); (C) polymethyl methacrylate (PM); and (D) hybrid ceramic (HC). Sixty-four feldspar ceramic crowns were designed with the biocopy mode, fabricated with a CAD/CAM system, luted on the dies, and then with the roots embedded in polymethyl methacrylate. Care was taken to position all specimens of the same morphology identically. Thermo-mechanical load cycling was performed in a chewing simulator followed by fractural loading of the crowns. A mixed effect linear model was fitted to the data, and pairwise contrasts were estimated on the marginal means and corrected for multiple testing according to Tukey (α = 0.05). The means for fracture load (N) were 2435 N (95% CI (2162, 2709)) for hybrid ceramic, 1838 N (95% CI (1565, 2112)) for reinforced composite, 1670 N (95% CI (1396, 1943)) for human tooth and 1142 N (95% CI (868, 1415)) for polymethyl methacrylate abutment materials. Post-hoc pairwise contrasts revealed a statistically significant (p < 0.05) difference among all groups except for reinforced composite and human dentin (p = 0.76). The results indicate that the mechanical properties of abutment dies play a significant role for a possible substitution of natural teeth in in vitro studies.

Measuring Mechanical Properties of Zirconia Dental Crowns by Nanoindentation

2013 ◽  
Vol 591 ◽  
pp. 150-153 ◽  
Author(s):  
Zhao Qiang Meng ◽  
Dan Yu Jiang
Keyword(s):  
Mechanical Properties ◽  
Dental Materials ◽  
Tetragonal Zirconia ◽  
Core Material ◽  
Stiffness Measurement ◽  
High Toughness ◽  
Dental Crowns ◽  
Dental Restorations ◽  
Nanoindentation Testing ◽  
Continuous Stiffness Measurement

Mechanical properties of dental materials are increasingly studied via nanoindentation testing. Due to the excellent mechanical properties, 3-mol%-Yttria-Stabilized Tetragonal Zirconia (3Y-TZP) has become an attractive high-toughness core material for fixed dental restorations. In this paper, the mechanical properties of 3Y-TZP were studied by nanoindentation. The continuous stiffness measurement (CSM) and the single load/unload cycle test controlled by displacement and load respectively were performed with a Berkovich indenter.

scholarly journals The Influence of Graphene in Improvement of Physico-Mechanical Properties in PMMA Denture Base Resins

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2335 ◽  
Author(s):  
Cecilia Bacali ◽  
Mindra Badea ◽  
Marioara Moldovan ◽  
Codruta Sarosi ◽  
Vivi Nastase ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dental Materials ◽  
Polarized Light ◽  
Modulus Of Rupture ◽  
Morphological Properties ◽  
Denture Base ◽  
Compression Behavior ◽  
High Flexibility ◽  
Pmma Resin

The clinical performances of dental materials depend on their mechanical profiles, determining their long-term deformation and wear resistance. This paper describes a study on the mechanical properties, water absorption and morphological properties of a polymethyl methacrylate (PMMA) resin enriched with graphene-silver nanoparticles (Gr-Ag). Two different concentrations—1 and 2 wt.%—of Gr-Ag were loaded into the PMMA material. For the mechanical characterization, the compression behavior, flexural strength and tensile strength were evaluated. Optical microscopy in polarized light and scanning electron microscopy were used for filler analysis. The filler addition led to an improvement in all mechanical properties, with slight changes being derived from the filler content variation. Gr-Ag use led to an increase in the applied maximum loads. Moreover, 1 wt.% Gr-Ag determined an increase of 174% in the modulus of rupture, which indicates high flexibility.

scholarly journals The Evolution of Dental Materials for Hybrid Prosthesis

2014 ◽  
Vol 8 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Jorge Gonzalez
Keyword(s):  
Computer Aided Design ◽  
Adult Population ◽  
Dental Materials ◽  
Missing Teeth ◽  
Dental Restorations ◽  
Computer Aided ◽  
Cad Cam ◽  
Hybrid Prosthesis ◽  
Aided Design ◽  
Older Adult Population

Since the immemorial, the replacement of missing teeth has been a medical and cosmetic necessity for human kind. Nowadays, middle-aged population groups have experienced improved oral health, as compared to previous generations, and the percentage of edentulous adults can be expected to further decline. However, with the continued increase in the number of older adult population, it is anticipated that the need for some form of full-mouth restoration might increase from 53.8 million in 1991 to 61 million in 2020 [1]. Denture prosthetics has undergone many development stages since the first dentures were fabricated. The introduction of computer-aided design/computer aided manufacturing (CAD/CAM) has resulted in a more accurate manufacturing of prosthetic frameworks, greater accuracy of dental restorations, and in particular, implant supported prosthesis.

scholarly journals Properties of zirconia-containing glass-ionomer cement

Cerâmica ◽  
2019 ◽  
Vol 65 (375) ◽  
pp. 394-399
Author(s):  
T. M. T. C. Melo ◽  
I. R. de Oliveira ◽  
A. S. Brandim ◽  
L. E. S. Soares
Keyword(s):  
Compressive Strength ◽  
Dental Materials ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Zro2 Content ◽  
Average Roughness ◽  
Dental Restorations ◽  
Low Thermal Expansion ◽  
Restorative Dental Materials

Abstract Glass-ionomer cements (GICs) are used as restorative dental materials due to their capacity to chemically adhere to enamel and dentin, low thermal expansion coefficient, and compatibility with dental structures. However, these materials have low resistance to wear and fracture. In this work, zirconia-reinforced GICs were prepared to evaluate the influence of particle size as well as ZrO2 content on their properties. All evaluated composites presented compressive strength values above the pure GIC strength. The highest compressive strength values were obtained with the addition of 8.5 wt% ZrO2. The average roughness obtained was not significantly changed compared to commercial GIC and the lowest value was for the composite with 10 wt% ZrO2 (50 mesh). In the microhardness test, the highest values were obtained with the addition of 8.5 wt% of ZrO2. Therefore, the results indicated that the addition of ZrO2 to GIC is an effective alternative to improve the quality of dental restorations.

Fabrication and mechanical properties of biomimetic nacre-like ceramic/polymer composites for chairside CAD/CAM dental restorations

2021 ◽  
Author(s):  
Sana Algharaibeh ◽  
Hongbo Wan ◽  
Rami Al-Fodeh ◽  
Anthony J. Ireland ◽  
Dongsheng Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Dental Restorations ◽  
Cad Cam

scholarly journals Rheological and Mechanical Properties of Resin-Based Materials Applied in Dental Restorations

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2975
Author(s):  
Xinyuan Zhang ◽  
Qi Zhang ◽  
Xin Meng ◽  
Yuting Ye ◽  
Daoshuo Feng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Dental Materials ◽  
Dental Bonding ◽  
Dental Filling ◽  
The Past ◽  
Dental Restorations ◽  
Luting Cement ◽  
Light Curing ◽  
Dental Restorative

Resin-based materials have been prevalent for dental restorations over the past few decades and have been widely used for a variety of direct and indirect procedures. Typically, resin-based dental materials are required to be flowable or moldable before setting and can provide adequate mechanical strength after setting. The setting method may include, but is not limited to, light-curing, self-curing or heating. In this review, based on different indications of resin-based dental materials (e.g., dental filling composite, dental bonding agent, resin luting cement), their rheological and mechanical properties were reviewed. Viscous and flexible properties were focused on for materials before setting, while elastic properties and mechanical strength were focused on for materials after setting. At the same time, the factors that may affect their rheological and mechanical properties were discussed. It is anticipated that the insightful information and prospections of this study will be useful to the future development and fabrication of resin-based dental restorative materials.

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