Review
Dentistry, Oral Surgery & Medicine
Beshr Hajhamid, Najm Alfrisany, Eszter Somogyi-Ganss
Summary: This study systematically reviewed the impact of low temperature degradation on the crystalline structures and optical properties of different types of dental monolithic zirconia materials. It was found that tetragonal zirconia showed an increase in monoclinic phase content during aging, while cubic zirconia demonstrated resistance to LTD. The optical properties of all zirconia materials investigated appeared to be compromised with increasing aging time.
Article
Chemistry, Multidisciplinary
Ludan Zhang, Yamin Li, Lintian Yuan, Qianyi Zhang, Yuqing Yan, Fan Dong, Jun Tang, Yuguang Wang
Summary: Non-invasive light-based antibacterial therapy has limited efficacy due to poor penetration of light into human tissues, but a wireless-powered blue-light zirconia implant shows promise for treating peri-implant infections. It allows for complete irradiation to complex peri-implant structures and enables timely and controllable anti-infection treatment. The use of blue micro-light emitting diodes as therapeutic light sources effectively kills peri-implant infection-related bacteria without the need for external photosensitive agents.
Article
Dentistry, Oral Surgery & Medicine
Adriano F. Lima
Summary: The study evaluated the impact of glass-reinforced ceramics on the wavelength and irradiance spectrum of blue and violet lights, with findings showing a reduction in irradiance of the LCUs and minimal changes in wavelength spectrum. The effect of different thicknesses of ceramics varied depending on the type of LCU and wavelength.
JOURNAL OF PROSTHODONTIC RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Lei Jiang, Meng-Qi Xu, Xin-Ling Lu, Xin-Wen Tong, Xin-Jie Liang, Hao Yu
Summary: The effects of multiple firings on the color and translucency of monolithic zirconia were investigated in this study. Multiple firings significantly affected the opalescence and color difference values, especially in the nanosized zirconia group. However, multiple firings did not have significant effects on the translucency and contrast ratio values of any materials. The surface topographies of the specimens after multiple firings were similar.
FRONTIERS IN MATERIALS
(2023)
Article
Materials Science, Ceramics
Keriman Pekkan
Summary: The different sintering programs have a more critical effect on CSP and CSM in terms of translucency variations, with the translucency program leading to the most grain growth.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Dentistry, Oral Surgery & Medicine
Yu-Ra Go, Kwang-Man Kim, Sung-Ho Park
Summary: The purpose of this in vitro study was to investigate the effects of the inhomogeneous distribution of irradiance passing through a computer-aided design and computer-aided manufacturing (CAD-CAM) block on the microhardness of resin cement. The study found that the microhardness of resin cement decreased with an increase in CAD-CAM block thickness. Resin cement under a 1-mm CAD-CAM block showed relatively uniform microhardness, while those under 2-mm and 4-mm blocks showed inhomogeneous microhardness. Therefore, the nonuniform light transmission from a light polymerization unit through CAD-CAM blocks resulted in the nonuniform microhardness of resin cement.
JOURNAL OF PROSTHETIC DENTISTRY
(2022)
Article
Materials Science, Multidisciplinary
Luciana M. Schabbach, Bruno C. dos Santos, Leticia S. De Bortoli, Marcio Celso Fredel, Bruno Henriques
Summary: This study utilized the Kubelka-Munk theory to evaluate the optical properties of three different commercial monolithic dental zirconia, discovering varying degrees of translucency across different groups. The Smart Dent (TM) group showed significantly higher light absorption coefficient, while the Zirkon (TM) group displayed stronger prevalence of scattering with low K/S values.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Magdalena Szawiola-Kirejczyk, Karolina Chmura, Krzysztof Gronkiewicz, Andrzej Gala, Jolanta E. Loster, Wojciech Ryniewicz
Summary: The study aimed to present conditioning methods of the cementation surface of zirconium oxide fixed dentures, considering new high translucency zirconia. Out of 1537 publications, 53 articles were selected covering methods of conditioning zirconium ceramics. Differences in properties of materials after conditioning suggest the need for separate protocols for highly translucent and traditional zirconia.
Article
Cell Biology
Rana A. Alghamdi, Marino Exposito-Rodriguez, Philip M. Mullineaux, Greg N. Brooke, Philippe P. Laissue
Summary: Phototoxicity is a significant constraint for live cell fluorescence microscopy, where excessive excitation light intensities may lead to erroneous conclusions. This study evaluates the impact of blue light on a motile mammalian cell line, showing that motility can be used as a reliable indicator of light-induced effects. Analysis of genes related to oxidative stress provides early detection of blue light effects and allows for the establishment of dose-response curves for phototoxicity assessment in mammalian cell line models.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2021)
Article
Dentistry, Oral Surgery & Medicine
Rua Babaier, Julfikar Haider, Nick Silikas, David C. Watts
Summary: This study investigated potential variations in polymerisation of light-and dual-cured resin cements photoactivated through four CAD/CAM restorative materials as a function of substrate thickness. The results showed that increasing substrate thickness reduced energy delivery to the luting cements and significantly affected the hardness of the cement discs. However, there was only a slight reduction in degree of conversion.
Article
Biotechnology & Applied Microbiology
Emilie Lang, Thibaut Thery, Caroline Peltier, Florent Colliau, Jeremy Adamuz, Cedric Grangeteau, Sebastien Dupont, Laurent Beney
Summary: A novel LED device emitting ultra-high irradiance blue light was designed in this study to achieve rapid microbial inactivation on food surfaces. Short treatments were effective in inhibiting yeast growth, with success in disinfecting various food contact surfaces.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2022)
Article
Polymer Science
Allegra Comba, Gaetano Paolone, Andrea Baldi, Alessandro Vichi, Cecilia Goracci, Giulia Bertozzi, Nicola Scotti
Summary: This study evaluated the effects of substrate and cement shades on the translucency and color of CAD/CAM materials, and found that the final translucency and color of ceramic restorations are significantly influenced by ceramic material, cement shade, and substrate color.
Article
Materials Science, Ceramics
Jaroslav Kastyl, Premysl Stastny, Zdenek Chlup, Lu Song, Erik Scasnovic, Martin Trunec
Summary: In this investigation, dental 3Y-TZP ceramics with excellent strength and enhanced translucency were developed. The applicability and resistance to low-temperature degradation of the new dental ceramics were demonstrated.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Wonjoon Moon, Joo Hyang Park, Han-Ah Lee, Bum-Soon Lim, Shin Hye Chung
Summary: The study observed that additive firing of dental zirconia after sintering can improve surface characteristics, reduce S. mutans viability, and enhance translucency. The results suggest that additive firing may help prevent secondary caries under zirconia restorations without compromising esthetic appearance.
Article
Dentistry, Oral Surgery & Medicine
Murat Alkurt, Zeynep Yesil Duymus, Seyma Yildiz
Summary: The effect of 10% carbamide peroxide and 6% hydrogen peroxide home bleaching agents on the translucency and color of monolithic zirconia was assessed. The study found that bleaching agents can significantly change the translucency and color of zirconia, suggesting caution should be taken when using home bleaching agents for patients with zirconia restorations.
DENTAL MATERIALS JOURNAL
(2022)
Article
Dentistry, Oral Surgery & Medicine
Daniel Edelhoff, Kurt-Juergen Erdelt, Bogna Stawarczyk, Anja Liebermann
Summary: Long-term failure rates of single-tooth restorations made of pressed LS2 were lower compared to those made of RC. Both materials can be recommended as permanent restorations for patients with severe tooth wear.
JOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY
(2023)
Article
Engineering, Biomedical
Veronika Greil, Felicitas Mayinger, Marcel Reymus, Bogna Stawarczyk
Summary: This study investigated the water sorption, water solubility, degree of conversion, elastic indentation modulus, edge chipping resistance and flexural strength of 3D-printed, milled and conventionally polymerized denture base resin materials. The results showed that most 3D-printed denture base resins had higher water sorption and water solubility, but also higher elastic indentation modulus and flexural strength. Only a few materials met the threshold values defined by the ISO norms for degree of conversion and flexural strength.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Marcel Reymus, Anja Liebermann, Sebastian Spintzyk, Bogna Stawarczyk
Summary: The aim of this study was to investigate the discoloration and surface properties of four CAD/CAM composite resins after storage in different food solutions and exposure to cigarette smoke. The results showed that the storage medium had the greatest influence on discoloration, followed by the interaction between storage medium and material, and then the material itself. Carrot juice had the highest impact on color change, while distilled water had the lowest. The storage medium also had a significant effect on surface roughness, and manual polishing could not restore discoloration or surface roughness.
INTERNATIONAL JOURNAL OF PROSTHODONTICS
(2023)
Article
Chemistry, Physical
Nicoleta Ilie, Andrei Cristian Ionescu, Karin Christine Huth, Marioara Moldovan
Summary: Modern light-cured, resin-based composites offer a wide range of shades and translucencies for aesthetic restoration, but the variation in pigmentation and opacifiers may affect light transmission during curing. This study quantified optical parameters and their real-time variation for a 13-shade composite palette, revealing a strong dependence of light transmission on shade. The study also identified colors with similar transmittance but different hues and found that darker shades had faster changes in light transmission.
Article
Chemistry, Physical
Valerie Lankes, Marcel Reymus, Felicitas Mayinger, Andrea Coldea, Anja Liebermann, Moritz Hoffmann, Bogna Stawarczyk
Summary: The present study investigated the effect of different cleaning methods and adhesives on the tensile bond strength between a resin-based composite and a temporary 3D printed resin. The results showed that regardless of the cleaning method, CUB, SUP, and VL can increase the bond strength between the 3D printed resin and the conventional luting resin.
Article
Chemistry, Physical
Nicoleta Ilie
Summary: Structural coloring of dental resin-based composites (RBC) is used to create universal chromatic materials. The microstructural adjustments involve nanoscale organic-inorganic core-shell structures. Higher polymer content in these structures compared to pigmented RBCs can influence aging. Accelerated and slow aging were compared, showing differentiated influences on the properties, especially in viscoelastic behavior. Accelerated aging had a greater effect, depending on the microstructure of the material.
Article
Materials Science, Composites
Nicoleta Ilie
Summary: Reversible addition-fragmentation chain transfer (RAFT)-mediated polymerization has been successfully applied in commercially available bulk-fill dental composites, optimizing polymerization at depth and reducing exposure time. The elastoplastic and viscoelastic behavior of the materials were compared in terms of microstructure and artificial aging. Aging had a significant impact on material behavior, but composition differences had minimal effect. The damping behavior was the most sensitive parameter to aging. Lab characterization showed comparable in vitro behavior with clinically successful materials.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Biotechnology & Applied Microbiology
Nicoleta Ilie
Summary: The development of resin-based composites involves considering trade-offs between different properties. Modern composites have smaller filler size for better esthetics, but this reduces mechanical properties and increases susceptibility to degradation. Our evaluation of various composites shows that nanospheres and agglomerations help generate good mechanical properties, but they are more prone to deterioration with aging. Pre-polymerized fillers have lower initial mechanical properties but are less sensitive to aging.
BIOENGINEERING-BASEL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Felicitas Mayinger, Marlis Eichberger, Lisa Marie Schoenhoff, Bogna Stawarczyk
Summary: The purpose of this study was to investigate the fracture loads of differently veneered and monolithic single-unit fixed dental prostheses (FDPs) made of a novel potential framework material, polyphenylene sulfone (PPSU). The results showed that the fracture loads of PPSU FDPs with different veneers were sufficient for clinical use.
INTERNATIONAL JOURNAL OF PROSTHODONTICS
(2023)
Article
Engineering, Biomedical
Ahmed Mahmoud Fouda, Bogna Stawarczyk, Mutlu Ozcan, Lamia Singer, Christoph Bourauel
Summary: This study evaluated the wear properties, fracture resistance, and optical properties of the newly introduced fully crystallized lithium disilicate (LDS) after glazing. The results demonstrated that the glazed fully crystallized LDS had better wear resistance compared to partially crystallized LDS, but showed more noticeable color changes than polished fully crystallized LDS. Polishing of fully crystallized LDS could still be considered a better option than glazing when aesthetics is a primary prerequisite.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Physical
Nina Luemkemann, Melisa Klimenta, Moritz Hoffmann, John Meinen, Bogna Stawarczyk
Summary: To test the impact of various factors on the dimensional stability of FFF models, including filaments, printing parameters, thermoforming foils, thermoforming cycles, and type of jaw, a study was conducted using two filaments and various printing parameters. The results showed that the printing parameters, thermoforming foil, and model type had the strongest influence on the dimensional stability of the models. Additionally, the dimensional stability of the FFF models decreased with increasing thermoforming cycles, unlike plaster models.
Article
Chemistry, Physical
Nicoleta Ilie
Summary: This article investigates the elastoplastic and viscoelastic response of an industrially cured CAD/CAM resin-based composite under different scales, spatial locations, aging conditions, and shading. The nano- and micro-scale measurements were more discriminative in identifying the impact of variables, while anisotropy as a function of spatial location was observed in all shades.
Article
Chemistry, Physical
Franz-Josef Schroeter, Nicoleta Ilie
Summary: This study compared the pushout test and the shear test in vitro to assess their clinical relevance in terms of cavity geometry and configuration factor. However, the pushout test had a significantly higher number of invalid measurements compared to the shear test, indicating the need for improvement.
Article
Engineering, Biomedical
Veronika Geiger, Felicitas Mayinger, Moritz Hoffmann, Marcel Reymus, Bogna Stawarczyk
Summary: The study investigated the mechanical properties of four additively manufactured denture base resins in different measurement environments, and found that the measurement environment impacts the strength and fracture toughness of the materials.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Andrea Coldea, Mustafa Borga Donmez, Bogna Stawarczyk
Summary: This study evaluates the impact of firing temperature and heating rate on the properties of zirconia veneering ceramic. The results indicate that translucency, hardness, and fracture toughness are affected by the tested parameters, while shrinkage and flexural strength are not affected.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Dentistry, Oral Surgery & Medicine
Chang Zeng, Pei Hu, Colin P. Egan, Brian E. Bergeron, Franklin Tay, Jingzhi Ma
Summary: The study compared the bacteria debridement efficacy of the first and second generations of sonic root canal irrigant activation systems. The results showed that activation of 2% NaOCl with either EndoActivator or SmartLite Pro EndoActivator significantly reduced the overall intracanal bacterial load compared to syringe-side-vented needle delivery. However, delivering 2% NaOCl for 5 minutes using the syringe-side-vented needle produced better bacteria debridement than either sonic agitation system.
JOURNAL OF DENTISTRY
(2024)
Article
Dentistry, Oral Surgery & Medicine
Alaa Husni Qari, Raghad Mohammed Alharbi, Shahd Saud Alomiri, Banan Nasser Alandanusi, Lina Ayman Mirza, Mohammad Hasan Al-Harthy
Summary: The study compares the experience of patients seen using teledentistry with traditional Orofacial Pain and TMD visits. Results indicated a borderline difference in effectively using teledentistry for follow-ups among different age groups, but no significant differences were found in patients' experience between virtual and conventional visits. This suggests that high-quality dental care services can be provided remotely without adversely affecting patient experience or quality of care.
JOURNAL OF DENTISTRY
(2024)
Article
Dentistry, Oral Surgery & Medicine
Giovanna Iezzi, Barbara Zavan, Morena Petrini, Letizia Ferroni, Tania Vanessa Pierfelice, Ugo D'Amora, Alfredo Ronca, Emira D'Amico, Carlo Mangano
Summary: This study characterized the surface topography and evaluated the biological responses of various cells to a novel 3D-printed dental implant. The surface of the implant showed a highly interconnected porous architecture and roughness, leading to good adhesion and growth of human oral osteoblasts, gingival fibroblasts, mesenchymal stem cells, and monocytes. These findings suggest that this 3D-printed implant has excellent potential for clinical applications.
JOURNAL OF DENTISTRY
(2024)