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Zirconia and radioactivity: An in vitro study to establish the presence of radionuclides in dental zirconia

The Journal of Prosthetic Dentistry

Available online 17 July 2020

The Journal of Prosthetic Dentistry


Statement of problem

Dental zirconia possesses concentrations of radionuclides, but their possible radioactivity is unknown.


The purpose of this in vitro study was to evaluate the radioactivity and radionuclide concentration in dental zirconia.

Material and methods

Three specimens were obtained from commonly used dental yttria-stabilized tetragonal zirconia polycrystal materials: Vita In-Ceram YZ, Zirkonzahn, and Zirkonzahn Prettau—producing a powder for the evaluation of radioactivity through gamma spectrometry. For the determination of radioactivity, a group of radionuclides (Ac-228, Pb-212, Tl-208, Pb-214, Bi-214, and Be-7) was evaluated.


The measurements of all the specimens reported that most activity came from the decay chain of uranium, radium, and thorium, obtaining a radioactivity of 11.082 Bq/kg for Vita In-Ceram YZ, <11.63 Bq/kg for Zirkonzahn, and <34.91 Bq/kg for Zirkonzahn Prettau.


Although all specimens contained radionuclides, their radioactivity was below the limit established by the International Atomic Energy Agency.

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An in vitro evaluation of microleakage of class V composite restorations using universal adhesive under different level of cavity moisture conditions



Objective of this study was to evaluate microleakage using self-etching universal adhesive on direct class V composite resin restorations under different cavity moisture conditions.

Materials and methods: 30 extracted human molars were divided into three groups (n=10) to compare the adhesive "Prime&BondActive"under optimal, overly dry, and overly wet cavity moisture conditions. Class V cavities were filled with nanocomposite and polished. All teeth were thermocycled for 3000 cycles, sealed and immersed in 1% methylene blue solution for 24 hours. Consequently, teeth were sectioned and analyzed under a microscope. Dye penetration lengths were scored in millimetres and permeation degrees.

Results: The results showed that self-etching universal adhesive was least permeable (lower dye penetration depths) under optimal working field conditions. During overly wet cavity moisture conditions performans decreased insignificantly.

Conclusions: According to the present study there is no significant difference of microleakage using universal adhesive in class V composite restorations with different moisture level. However, too wet working field conditions tend to increase microleakage formation. In clinical performance, it could be suggested to keep an appropriate cavity moisture level.

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Voco GrandioSO Light Flow Extremely Flowable, Yet Highly Stable Composite with Extra-Fine Cannula

VOCO is proud to present GrandioSO Light Flow, the low viscosity nano-hybrid flowable composite. This new material utilizes an ultra-fine intra-oral tip, even finer than a periodontal probe, with an extremely low viscosity. This enables GrandioSO Light Flow to deliver a targeted and precise application across a wide range of indications while assisting the practitioner to achieve their goal of preserving healthy tooth structure.

GrandioSO Light Flow is an addition to a product line that includes GrandioSO Flow and GrandioSO Heavy Flow, and like those materials, it offers a unique set of solutions for practitioners, featuring a similarly high fill-rate for superior physical properties while still maintaining flowability and a low viscosity.

With a filler content of 76% by weight, GrandioSO Light Flow’s 3-point flexural strength of 151 MPa is an example of how it effortlessly attains physical property values much higher than traditional flowables that often have lower fill rates and higher viscosities.
GrandioSO Light Flow represents an optimal addition for delicate and customized applications where precision is key. This makes it possible to avoid expelling excess material and creating unnecessary waste.

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Imaging Technology Evolves with Latest Addition to Carestream Dental’s Best-Selling CS 8100 Family


ATLANTA—The next evolution of the CS 8100 and CS 8100 3D families is here. The Evo Editions are compact, yet powerful, panoramic and CBCT versions of the systems that general practitioners and specialists alike have come to rely on, now with advanced software updates that provide enhanced images and new tools for more confident diagnoses.


“We’ve found that data is what makes the difference when diagnosing,” Ed Shellard, D.M.D., chief dental officer, Carestream Dental, said. “By focusing on new software and improved algorithms, we can deliver impactful updates to doctors without having to completely redesign equipment or ask doctors to invest in a new extraoral system every few years.”


Powerful Panoramic Images: CS 8100 Family Evo Edition

The CS 8100 Evo Edition and CS 8100SC Evo Edition introduces new software updates that produce enhanced images thanks to Tomosharp technology. This new update delivers best-in-class imaging that also provides greater tolerance to imperfect positioning. The entire jaw anatomy is captured in a single acquisition. Then, algorithms analyze the area where the anatomy is the sharpest and reconstruct the best possible panoramic image automatically. The result is an impressively sharp image. Not only does the clinician end up with the ideal image, Tomosharp helps to compensate for less-than-ideal patient positioning.


Additionally, the CS Adapt Anatomic family of filters deliver a brand-new processing engine for outstanding panoramic and cephalometric images.


Enhanced 3D Images: CS 8100 3D Family Evo Edition

The Evo Edition of the CS 8100 3D family—the CS 8100 3D Evo Edition and CS 8100SC 3D Evo Edition—give doctors access to the same high-end features from Carestream Dental’s flagship CS 9600 CBCT system.


CS MAR greatly reduces metal artifacts and starburst affects that can often be distracting and make viewing an area of interest difficult. Instead, the CS MAR filter gives doctors a clearer view and more confidence in their diagnoses. They can even use a unique live comparison tool to toggle back and forth between views with and without CS MAR to help them confirm diagnosis.


In that same vein, all-new Advanced Noise Reduction (ANR) reduces noise while preserving image details. This feature is ideal for 75-micron resolution scans and improves small details like a lateral canal or crack as well as the perception of cortical bone edge, ligament space and soft tissues.


As multi-modality systems, the CS 8100 3D Evo Edition and CS 8100SC 3D Evo Edition also feature Tomosharp technology and the new CS Adapt Anatomic family of filters for advanced 2D imaging to meet almost every clinical need.

The Evo Editions of the CS 8100, CS 8100SC, CS 8100 3D and CS 8100SC 3D include all the same award-winning features of the CS 8100—the system that started it all—including its compact footprint and superb image quality. No matter which Evo Edition of the system practices choose, each is supported by CS Imaging version 8, a powerful imaging platform that centralizes and displays all of doctors’ 2D images, 3D images and CAD/CAM data in one software to aid in more comprehensive diagnoses, optimized treatment workflows and enhanced case presentation. 


Practitioners who already own a system from the CS 8100 family or CS 8100 3D family can easily upgrade their existing technology to experience the latest benefits the Evo Edition has to offer. To learn more about the next evolution of the CS 8100 family and CS 8100 3D family, or any of Carestream Dental’s innovative technology, visit 






About Carestream Dental

Carestream Dental is committed to transforming dentistry, simplifying technology and changing lives. In this pursuit, we focus on providing the latest in high-quality scanning technology, the smartest chairside systems, the most intuitive practice management software, incredibly accurate imaging software and the data intelligence that helps continually refine patient outcomes. And we offer these solutions for the full range of dental and oral health professionals. For more information please visit

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IDS 2021 will revive the international dental business


Leading global trade fair enables safe restart for the post-corona phase

The coronavirus pandemic is also posing unprecedented challenges for the dental industry. The impact on markets and various business models are still difficult to assess. At the same time, all industry participants are working intensively on creative solutions to optimally ensure safe and productive cooperation with partners and suppliers, especially in times of crisis. As the world’s leading trade fair for the dental industry, IDS plays a key role for a successful restart of business in the post-corona era in terms of establishing the best possible framework for safe, personal exchange and encouraging a spirit of optimism. “In the past few months, we developed a comprehensive concept for restarting trade fairs in Cologne based on extensive processes and close cooperation with all the relevant authorities. IDS will also use this concept to provide new inspiration for the dental business. We have created a secure communication platform where experts, enthusiasts and decision makers from a wide range of areas can come together in order to explore new, sustainable avenues for the dental industry,” says Oliver Frese, Managing Director of Koelnmesse. For Mark Stephen Pace, Chairman of the Board of the Association of the German Dental Industry (VDDI), IDS 2021 will also be the decisive kick-off for a new start after the corona crisis: “The international industry is looking at IDS 2021 with high expectations because it plays a significant role in successful crisis management, especially with regard to the personal exchange of strategies in the various markets and regions. Only through direct dialogue can you examine your own needs and positions and analyse a reorientation, also in terms of value chains.”

The focus of a trade fair is on personal face-to-face contact. In order to make this networking as safe and successful as possible, Koelnmesse has developed a host of measures in accordance with the provisions of the corona protection ordinance of the state of North Rhine-Westphalia and in close coordination with the authorities in Cologne. These measures work together seamlessly and regulate interaction at the trade fair. Our goal is to ensure the highest degree of professional safety and create an environment in which industries and business can grow again. Koelnmesse has compiled its measures to protect exhibitors and visitors under four sections entitled SHOW SAFE, MEET SAFE, STAY SAFE and VISIT SAFE. These measures regulate safe interaction at the trade fair and ensure that exhibitors and visitors can once again meet in a relaxed manner. IDS therefore offers plenty of possibilities and room for spreading large numbers of participants out safely over the corresponding areas. Koelnmesse’s digital signage system offers a further advantage. Planning the stands with larger floor areas will ensure that minimum distances can be maintained. As a result, the number of visitors at a stand will not be limited, provided that a minimum distance of 1.5 metres can be observed. At the same time, the distribution of trade fair participants and flow of visitors will be monitored and, if necessary, regulated with suitable technical devices. The safety concept for the upcoming IDS also includes restricting the ticketing system exclusively to online tickets and fully registering all participants to ensure traceability. Koelnmesse will review the security concept on a regular basis and adapt it to the latest conditions accordingly.

IDS 2021 sees the crisis as an opportunity to rethink its trade fair philosophy and adapt to requirements that will certainly be different from those prior to the corona pandemic. However, face-to-face encounters will continue to be essential for maintaining existing contacts and developing new business opportunities. Only then can joint solutions for crisis management be developed, existing business relationships secured and new business contacts forged. IDS 2021 is therefore designed as an open forum in order to facilitate precisely this form of exchange across borders for the international dental industry.

AUMA, the Association of the German Trade Fair Industry, also views trade fairs as an indispensable catalyst for economic development. In this regard, AUMA Chairman Philip Harting had this to say: “Trade fairs will once again provide impetus for purchasing and procurement in many industries through the presentation of innovations and personal trust-building communication.”

About IDS
IDS (International Dental Show) takes place in Cologne every two years and is organised by the GFDI Gesellschaft zur Förderung der Dental-Industrie mbH, the commercial enterprise of the Association of German Dental Manufacturers (VDDI) and is staged by Koelnmesse GmbH, Cologne.

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Can paracetamol lower stress and anxiety by blunting emotions during and after computer guided dental implant surgeries? Findings from a randomized crossover clinical trial

Journal of Dental Sciences

Available online 4 July 2020

Journal of Dental Sciences



Dental implants insertion can be a major factor in stress and anxiety. The aim was to evaluate the paracetamol ability to lower stress and anxiety when compared with ibuprofen during and after computer guided implant surgery utilizing CAD/CAM surgical template and a computer vision system for assessment.

Materials and methods

Thirty patients were enrolled in a crossover study design having bilateral missing lower molars. Patients were randomized into 2 equal groups with the first assigned for dental implant insertion in the lower molar area on one side with the administration of paracetamol (with 7-day follow-up) followed by 2-week washout period, then another implant was inserted on the contra-lateral side with ibuprofen. The second group received the same drugs but in reversed order. Salivary cortisol level was used to measure anxiety and a computer vision system was used to measure swelling. Visual-Analogue-Scale pain score from 0-to-100 was also utilized.


Only 29 patients completed the study. Stress and anxiety was found to be significantly lower in paracetamol group (4.1 ± 1.08 ng/mL and 6.2 ± 0.94 ng/mL for paracetamol/ibuprofen respectively). Pain score was 13.1 ± 1.1 and 12.9 ± 2.3 in paracetamol/ibuprofen groups respectively with no significant differences. Swelling showed significant difference favoring the paracetamol group (0.91 ± 0.41 and 0.61 ± 0.31 for paracetamol/ibuprofen respectively).


Paracetamol is effective in reducing stress by minimizing anxiety and blunting emotions of “fear-from-pain” so that pain is no longer perceived as much. However, paracetamol lacks the ability to control swelling at implant site. Computer guided flapless-implant surgery with immediate loading can be recommended for fearful patients.

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