All posts by dr.semion1968

Homepage > dr.semion1968

New oral hygiene care regimen reduces postoperative oral bacteria count and number of days with elevated fever in ICU patients with esophageal cancer.

J Oral Sci. 2018 Aug 30. doi: 10.2334/josnusd.17-0381. [Epub ahead of print]


Using a controlled pre/post study design, we investigated the effects of professional mechanical cleaning of the oral cavity with benzethonium chloride, interdental brushes, and hydrogen peroxide on the number of oral bacteria and postoperative complications among esophageal cancer patients in an intensive care unit. Before surgery, 44 patients with esophageal cancer were recruited at Okayama Hospital from January through August 2015. The control group (n = 23) received routine oral hygiene care in the intensive care unit. The intervention group (n = 21) received intensive interdental cleaning with benzethonium chloride solution and tongue cleaning with hydrogen peroxide. The number of oral bacteria on the tongue surface and plaque index were significantly lower in the intervention group than in the control group on postoperative days 1 and 2 (P < 0.05). Additionally, the number of days with elevated fever during a 1-week period was significantly lower in the intervention group than in the control group (P = 0.037). As compared with routine oral hygiene, a new oral hygiene regimen comprising benzethonium chloride, interdental brushes, and hydrogen peroxide significantly reduced the number of oral bacteria and days with elevated fever in patients with esophageal cancer.
Continue reading

Dentsply Sirona World 2018 proves again to be the dental industry’s must- attend educational event

Unmatched education, cutting-edge technologies and products, plus nonstop entertainment left attendees motivated by what they learned and excited to come again next year 

CHARLOTTE, NC (Sept. 19, 2018) – As three days of unparalleled educational opportunities and thrilling entertainment options came to a close, attendees left the Rosen Shingle Creek Resort in Orlando understanding why Dentsply Sirona World remains the premier dental event in the world. 

“With more than 100 Breakout Sessions, rousing General Sessions, top-tier entertainment and lively social activities, Dentsply Sirona World proved why there is no equal to the Ultimate Dental Meeting,” said Vice President of Marketing Ingo Zimmer.

Held Sept. 13-15, attendees filled enlightening education sessions taught by the biggest names in dentistry, got hands- on with the most innovative technologies and products on the trade show floor, experienced once-in-a-lifetime private shows from singer Katy Perry and comedian Jim Gaffigan and so much more! 

Continuing educational courses were offered in 12 specialized tracks, a record for the event. Attendees had no shortage of incredibly high-quality learning opportunities when they personalized their schedules to meet their needs.

The General Sessions kept attendees on the edge of their seats with inspiring speakers, including Dr. Dan Butterman, Dr. Stephen Sterlitz, Heidi Arndt, Jennifer Chevalier and Brian McCarthy. Additionally, Dr. Ross Enfinger performed a live dental procedure.

Per usual, Dentsply Sirona World offered its guests the chance to experience celebrity entertainment in a personal setting. Pulitzer Prize-winning author and New York Times best seller Doris Kearns Goodwin captivated the audience with her

keynote address, sponsored by Implant Seminars, while Grammy-nominated comedian Jim Gaffigan kept them laughing with his standup and you could really hear the crowd ROAR during global pop superstar Katy Perry’s private concert.

Two wellness activities allowed attendees to better both their minds and bodies, as Compassionate Finance sponsored both a medieval fun run and a yoga class. Attendees were in a jovial mood wearing their best medieval-inspired costumes, as they made their way along the Rosen Shingle’s beautiful championship golf course during Friday morning’s fun run. On Saturday, guests looked inward and found their Zen during the Yoga Mix! Modern Twist on Yoga class.
The Oktoberfest gathering was the perfect end to an amazing three days in Orlando. Guests put on their lederhosen or dirndls and hit the dance floor to socialize with their peers. From the rousing Bavarian band, to the scrumptious food to the tasty drinks, this party captured the true spirit of the German festival.
Everyone is encouraged to start planning now for Dentsply Sirona World 2019! Scheduled October 3-5, the Ultimate Dental Meeting is heading back to Las Vegas to the Mandalay Bay Casino and Resort. Register now at to take advantage of the lowest prices available for Dentsply Sirona World 2019!

Dentsply Sirona is the world’s largest manufacturer of professional dental products and technologies, with a 130-year history of innovation and service to the dental industry and patients worldwide. Dentsply Sirona develops, manufactures, and markets a comprehensive solutions offering including dental and oral health products as well as other consumable medical devices under a strong portfolio of world class brands. As
The Dental Solutions Company TM, Dentsply Sirona’s products provide innovative, high-quality and effective solutions to advance patient care and deliver better, safer and faster dentistry. Dentsply Sirona’s global headquarters is located in York, Pennsylvania, and the international headquarters is based in Salzburg, Austria. The company’s shares are listed in the United States on NASDAQ under the symbol XRAY. Visit for more information about Dentsply Sirona and its products.

Continue reading

Oral antiseptics and nickel–titanium alloys: mechanical and chemical effects of interaction


pp 1–8 | Cite as

Original Article

First Online: 03 September 2018


The effect of oral antiseptics on the corrosion of nickel–titanium (NiTi) alloys with various coating was investigated. Uncoated, titanium nitride-coated and rhodium-coated NiTi archwires (0.020 × 0.020″) were tested in interaction with artificial saliva pH 4.8 and oral antiseptics based on hyaluronic acid (Gengigel), chlorhexidine (Curasept) and essential oils in alcohol base (Listerine). The dynamics of nickel and titanium ions release were recorded during 28 days. Springback ratio and modulus of resilience were assessed by three-point bending test. The results showed that corrosion of NiTi is related to type of antiseptic mouth rinse and coating formulations. Exposure to an artificial saliva and antiseptics tend to reduce flexibility and resilience of NiTi archwires. The influence of the media is more significant than the influence of the type of the alloys coating. The largest release of nickel ions is in the first 3 days. Antiseptics do not cause further deterioration of the elastic properties in uncoated NiTi compared to saliva. As a result of exposure of nitrified NiTi wires in Listerine, there is bigger release of nickel ions, decrease in elastic properties and lower force delivery in unload. Listerine tends to reduce elastic properties of rhodium-coated wires also. In conclusion, except for Listerine, changes of mechanical characteristics induced by antiseptics are small and would not have a clinically important impact. Generally, Curasept would be the most suitable option.
Continue reading

Remineralization effects when using different methods to apply fluoride varnish in vitro

Available online 1 September 2018
Journal of Dental Sciences



Remineralization efficacy for early caries lesion may change when fluoride varnish (FV) is applied directly or indirectly to the lesion. This in vitro study compared direct and indirect remineralization efficacies of FV on artificial caries lesions and evaluated acid-resistance of lesion remineralized by FV and artificial saliva.

Materials and methods

One hundred and twenty-six bovine demineralized specimens were allocated to four varnish groups (Duraphat®, EnamelPro®, MI™, and ClinproWhite™, n = 28 each) and a negative-control group (n = 14). Half of specimens from each varnish group had the FV applied and the other specimens didn’t. The specimens treated and not treated with the FV were immersed together in 20 mL of artificial saliva at 37 °C for 24 h. Then the applied FV was removed carefully from the specimen, and immersion process was continued in fresh artificial saliva for 48 h. The negative-control group was immersed in artificial saliva for same time as in varnish groups. The acid resistance of remineralized specimens from varnish groups was compared to negative-control group. Vickers microhardness number (VHN) was measured to evaluate re-demineralization effect.


The ΔVHN was significantly higher for indirect remineralization (134.4 ± 31.5, mean ± SD) than for direct remineralization (66.8 ± 27.9). All varnish groups showed significant differences between the direct and indirect application methods. The acid resistance of remineralized specimens was higher in the all FV groups than in the negative-control.


This in vitro study confirmed that the remineralization effect of fluoride varnishes would be higher in the vicinity than the underneath of the varnish treated surface.
Continue reading

Research and Education Loss of tooth structure associated with preparation for two monolithic CAD-CAM complete coverage restorations


Statement of problem

Different techniques are used to fabricate complete coverage restorations. Each fabrication technique requires a specific preparation design that may violate a principle of tooth preparation, that is, conservation of tooth structure.


The purpose of this in vitro study was to compare the volume of loss of mandibular first molar structure associated with a preparation for computer-aided design and computer-aided manufacturing (CAD-CAM) versus conventionally fabricated complete coverage restorations.

Materials and methods

Fifty artificial mandibular right first molars were weighed before and after preparation for complete coverage restorations of the following types: complete cast, monolithic zirconia, monolithic pressed lithium disilicate, monolithic milled lithium disilicate, and metal-ceramic crowns (n=10 per method). Tooth mass loss was measured by subtracting the mass after preparation from the mass before the preparation, and tooth volume loss was calculated by dividing the mass by the density of the material. A robust analysis of variance (ANOVA), followed by a post hoc test, was used to compare the volume of tooth loss (α=.01).


Mean tooth volume losses were 255.6 mm3, 270.0 mm3, 312.7 mm3, 331.7 mm3, and 309.9 mm3 for complete cast, monolithic zirconia, monolithic pressed lithium disilicate, monolithic milled lithium disilicate, and metal-ceramic crowns, respectively. Teeth prepared for monolithic CAD-CAM zirconia and lithium disilicate crowns did not exhibit a significantly lower (P>.01) decrease in volume loss than with complete cast and monolithic pressed lithium crowns.


Preparation of teeth for monolithic CAD-CAM complete coverage restorations is not associated with a significantly higher volume of tooth loss than their conventionally fabricated counterpart preparations.
Continue reading