On April 29-30, Drs. Bud Mopper and Dennis Hartlieb present this beginner’s level class using composite to seamlessly repair a large Class IV fracture. This two-day live-virtual course with one-on-one time will cover beveling, layering, contouring and polishing to create a completely invisible composite restoration. Participants will also become familiar with the different composite materials and where they are used to create an esthetic result. Course fee is $1,900.00, and includes materials bundle used in the hands-on. Attendance includes access to post-course instruction videos and a technical support group.


For more information, please contact Erika at 800-8372321 or sign-up online at


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Dentistry during COVID-19: Engineering analysis offers guidelines to reduce exposure

ANN ARBOR—The close proximities and confined spaces of the dental office environment in a pandemic pose a host of potential health risks, and it may be even more problematic in dental schools and other large dental offices with similar cubicle set-ups. 
It’s a situation University of Michigan engineers have sought to make safer by analyzing the transport of aerosols within the clinics at U-M School of Dentistry. In its role educating dental students, the school has clinics where up to 40 patients can be treated at the same time. 
50097884026_1b8e91c632_q.jpgSensing equipment often used to analyze auto emissions helped the engineering researchers understand areas of concern that included: the 5-foot-high walls that separate each dental cubicle space and the aerosol droplets that are created during procedures that use water jets, such as high speed drilling and ultrasonic cleaning.
"Historic research has looked at very traditional dental settings, like singular practices, singular closable rooms, but the dental school is not like that," said Romesh Nalliah, associate dean for patient services at the U-M School of Dentistry. "We have low barriers between cubicles so that instructors can peek over the top to speak to students."
Nalliah reached out to U-M’s College of Engineering for help, and Margaret Wooldridge and Andre Boehman, both professors of mechanical engineering, answered the call. 
Utilizing high-speed imaging, particle spectrometers, scanning mobility particle sizing systems, and optical particle counters, the two engineers were able to see how the droplets were being created, how many were created, and what happened to them during drilling procedures on mannequins.
Findings: Droplets bounce off teeth, move between cubicles
"The results were fascinating," said Wooldridge, professor of mechanical engineering. "We saw things that were intuitive—like when the drill spins along the surface of a tooth, droplets are propelled in the same direction. 
"But we also saw huge clouds of droplets that were generated as well. From the sprayed water used to cool the drill and the tooth, droplets would break apart into even smaller droplets. Some droplets bounce off the tooth like billiard balls or a soccer ball. And the droplets hang around, recirculate and form little clouds right by the mouth of the test mannequins used."
Further testing on aerosol suction devices designed to capture those aerosol particles around the patients’ mouths showed them to have limited effectiveness. The sheer number of variables involved in the treatment setting proved to be a hindrance.
U-M researchers were able to show how droplets could move from one cubicle to the next. Further testing showed that plexiglass barriers, extended above the clinic’s current partitions, could stop the flow of particles between cubicles.
Covid-19 mitigation measures let dental clinic continue operating 
With data from U-M engineers in hand, Nalliah and the School of Dentistry went a step further, working with experts at Michigan Medicine to analyze airflow throughout the clinic. The use of the extended plexiglass, while preventing cubicle to cubicle particle flow, also trapped particles in the same area. That created the potential for exposure for the next patient treated in a cubicle.
To combat that, plexiglass barriers were added to some, but not all, of the treatment areas in order to maintain good air flow, and to waiting periods in addition to cleaning and sanitizing the stations between patients. The clinic now can handle roughly half its typical patient capacity under markedly safer conditions.
"The capacity that we have now is still limited, but much better than what we were first facing," Nalliah said. "It’s an ongoing, ever-changing, dynamic situation."
Facilities and businesses across the globe that provide in-person services have had to assess the dangers posed by bringing customers and patients inside their operations. As U-M has worked to find ways to safely provide necessary services, Wooldridge and Boehman’s expertise has routinely been called on. And the university has bolstered their capabilities with the addition of new equipment,
"The aerosol instrumentation that the College of Engineering helped us acquire for COVID-19-related work has been extremely useful in a variety of situations and scenarios," said Boehman, director of the W.E. Lay Automotive Laboratory. "Both our optical particle sizer and engine exhaust particle sizer have traveled to U-M’s Med School and the clinics at the School of Dentistry. These two instruments have been very useful and accumulated many miles on the road traveling to various labs."
In March, right after the spread of COVID-19 was declared a national emergency in the U.S., Boehman and Wooldridge worked with Michigan Medicine to examine aerosols created in hospital environments by different methods of oxygen delivery.
And over the summer, Boehman worked with Jesse Capecelatro, assistant professor of mechanical engineering, and Kevin Maki, associate professor of naval architecture and marine engineering, to study particle flows on U-M’s buses.
In both instances, the work produced recommended operational changes and new guidelines for improving safety.


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Voco Introduces Provicol QM Aesthetic Translucent Zinc Oxide, Non-Eugenol Temporary Cement with Calcium Hydroxide

Introducing Provicol QM Aesthetic, a zinc oxide-based transparent non-eugenol temporary cement that secures provisional crowns and bridges without affecting the overlying color of the restoration.

This zinc oxide-based formula promotes anti-bacterial properties as well as an ideal adhesion and strength with a semi-elastic consistency that allows for easy clean up. Distinct from resin-based temporary cements, zinc-oxide cements do not permanently bond to composite core build-ups, therefore simplifying the removal of temporaries..

The new and innovative glass matrix with polyhedral particles allows for a translucency only achieved by resin-based cements. The result is an excellent shade matching of the cement to the temporary restoration.

Provicol QM Aesthetic is highly radiopaque and contains calcium hydroxide, which promotes the development of tertiary dentin and helps to prevent hypersensitivity. The very low film thickness (7 µm) enhances the fit and promotes an excellent retention.

Provicol QM Aesthetic is available in 5ml QuickMix automix syringes.

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Introducing FULL CONTACT™ Cosmedent’s New Sectional Matrix Bands


Cosmedent’s new FULL CONTACT™ sectional matrix bands have a multitude of advantages for the clinician: they are ultrathin and easy to place, pre-contoured for complete contact and resilient, holding their shape once placed. These new matrix bands can wedge from both buccal and lingual sides ensuring a complete gingival seal. They can also be used with any ring system or alone. FULL CONTACT sectional matrix bands are available in both adult and pediatric sizes.

For more information, call our customer care representatives at 800-621-6729 or visit us online at


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Extraction with an electric motor-driven handpiece may still cause subcutaneous emphysema – A case report



Extraction with an electric motor-driven handpiece may still cause subcutaneous emphysema – A case report

Under a Creative Commons license
open access


Subcutaneous emphysema
Extraction complication
Dental iatrogenic disease
Dental high-speed equipment

Subcutaneous emphysema (SE) in the head and neck region is a rare iatrogenic complication from oral surgery, restorative dentistry, endodontic, and periodontal treatments.1,2 The air-driven air- turbine handpiece was responsible for most SE events. Patients with SE show noticeable swelling and discomfort where air has penetrated into subcutaneous tissue. Differential diagnosis of SE from anaphylactic reactions or angioedema is crepitus on palpation and timing. In severe cases, SE can spread and cause respiratory or cardiac distress.3 However, most SE cases resolve within 3–5 days without complications.

This article reported a case of SE around the paraorbital and submandibular regions through extractions of teeth 28 and 38. This 20-year-old man came to the emergency room at night with the major complaint of pain and discomfort during swallowing. Sudden swelling at his left face during extractions of teeth 28 and 38 three hours ago was mentioned. The original surgeon who performed the odontectomy was aware of the SE after removing the surgical drape and specific post-operation instructions were given as follows: immediate hospital care may be needed if the patient encountered difficulties in swallowing or any worsen complications or discomfort. The surgeon was uncertain whether using the electric motor-driven handpiece during tooth extraction was the main cause of SE. Lacking the ability to differentiate between difficulties in swallowing or post-operation discomfort, the patient decided to visit our hospital for further help. Physical examination revealed that everything was within normal range, except the swelling at the left paraorbital and submandibular regions with typical crepitus on palpation and minor discomfort. Thus, the SE during and after teeth extraction was diagnosed (Fig. 1A). Both the left upper and lower extraction wounds were primarily closed with sutures, no sign of inflammation or swelling was noted at either the tonsil or lingual area, and hemostasis was obtained. Panoramic radiograph showed no obvious jawbone lesion (Fig. 1B). The patient was kept under observation for 1.5 h and then granted permission to leave due to absence of further complications. Oral administration of 1 tablet of amoxicillin/clavulanic acid (875/125 mg/tablet, Curam®) every 12 h, 1 tablet of diclofenac potassium (25 mg/tablet, Cataflam®) three times a day, and dexamethasone (0.5 mg/tablet, Dexazone®) three times a day were prescribed to the patient for 3 days. Patient was later followed at the previous surgeon’s local dental clinic after 3 days and signs and symptoms of SE were resolved.

Figure 1

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Figure 1. Clinical and radiographic photographs of the patient. (A) Extra-oral appearance of the patient showing the swelling at the left paraorbital and submandibular regions during and after extractions of teeth 28 and 38. (B) Panoramic radiograph showing intact lamina dura of the extraction sockets and no obvious jawbone lesion.

Tooth extraction-related SE is often caused by using air-driven/air-turbine high speed handpiece. Although some suggestions were raised for preventing extraction complications,4 using electric-driven, sonic/ultrasonic or non-vented high-speed devices for surgical extraction is the best method preventing the occurrence of SE.5 In this case, even though electric motor driven handpiece was used, SE still occurred. That was probably caused by the air from the water-cooling system of the handpiece (from the dental unit) which the surgeon did not notice. This issue was later confirmed by him. It is better to check if there is extra air vented forward from the handpiece before using a new device. By giving antibiotic, analgesic, and corticosteroids, SE can be effectively managed without the need for surgical intervention, but prevention is still the best policy.

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IDS 2021: VDDI and Koelnmesse postpone the International Dental Show from March until autumn 2021


IDS 2021: VDDI and Koelnmesse postpone the International Dental Show from March until autumn 2021 

Decision to give exhibitors and visitors more planning security 

With a view to the unchanged challenges the Corona pandemic is raising in Germany and the anticipated continuation of the extensive restriction of personal contacts by the Government, States and municipalities at the beginning of the new year, the VDDI board, the Gesellschaft zur Förderung der Dental-Industrie mbH (GFDI) (the commercial enterprise of the VDDI) and Koelnmesse have decided to postpone IDS – the International Dental Show. The trade fair that was originally planned to take place from 10 to 13 March, will now be held from 22 to 25 September 2021. The organisers are taking this step in reaction to the currently ongoing Corona policy, which may be extended in Germany into the new year. By postponing the 39th edition of IDS to the September, the organisers are hoping that due to the then anticipated, improved health situation and relaxation of the travel restrictions more international partners and customers will travel to Cologne. 

The presently essential political decisions taken by the Federal Government are also affecting trade fairs in Germany. And are also impacting IDS. It will thus be staged in September with the new trade fair concept that was planned for March, which unites hybrid, i.e. physical and digital elements. The #B-SAFE4business concept that is based on the applicable Corona Protection Ordinance will also accompany IDS in September in order to offer the exhibitors and visitors the highest possible level of safety. "The Association of the German Dental Industry and Koelnmesse have kept a close eye on the developments of the pandemic at all times and have analysed the possible consequences on the trade fair activities of all personal involved. The health of our exhibitors, partners and visitors takes top priority for us here. After assessing the current facts, we have had to refrain from staging IDS in March and are postponing the always successful dental show to the autumn of next year," is how Mark Stephen Pace, Chairman of the VDDI and Oliver Freser, Chief Operating Officer of Koelnmesse GmbH, explained the decision. 

More planning security: Dental industry to be united again at IDS in Cologne after two and a half years 
The exhibitors now have six months longer to prepare their presence at the leading global trade fair and push innovations. The dental industry will meet up again in the exhibition halls in Cologne after two and a half years: This decision will enable the exhibitors and visitors to engage in a physical and personal exchange live again and experience the pronounced community principle, which has distinguished the dental industry for decades. The prospect of a strong and economically attractive re-start after the Corona pandemic thus exists. 

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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