Glaxo Removing Zinc from Denture Creams: Part 2

Hi everyone,

I received this email blast from the Ontario Dental Association regarding the removal of zinc from denture adhesive pastes. Here's the quote:

GlaxoSmithKline (GSK) warns about a potential health risk associated with long-term, excessive use of zinc-containing denture adhesives Poli-Grip "Advanced Care," "Extra Strength" and "Ultra Fresh."

Media Releases from Glaxo Smith Kline:

• English (online PDF) 181KB
• French (online PDF) 223KB

GSK will stop manufacturing these zinc-containing denture adhesive and plans to replace them with zinc free products.

While zinc is an essential part of the diet, recent publications suggest that an excessive intake of zinc-containing denture adhesives over several years may lead to the development of neurological symptoms such as numbness, tingling or weakness in the arms and legs, difficulties with walking and balance, and blood problems such as anemia.

Poli-Grip is safe to use as directed in the product label. However, some consumers apply more adhesive than directed and use it more than once a day. Therefore, as a precautionary measure to minimize any potential risks to these consumers, GSK has voluntarily stopped the manufacture, distribution and advertising of these products.

Health Canada has not to date issued a recall of the product. These measures are being taken by GSK.

ODA Members may wish to advise patients who use denture adhesives to:

• follow package instructions
• use zinc-free alternative such as Poli-Grip "Original," "Comfort Strips" or "Powder" and
• arrange a consultation with you to assess ill-fitting dentures.

Consumers with questions may call GSK at 1-888-521-8033.

Source: ODA Advantage Email Sent Feb 22, 2010, Read on Feb 23, 2010.

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

Glaxo Removing Zinc from Denture Creams

Hi everyone,

I saw this article on Zinc and denture creams and the link with neurological problems. Here's the teaser quote from the Globe and Mail:

After being hit with dozens of lawsuits and growing questions about product safety, GlaxoSmithKline Consumer Healthcare Inc. announced yesterday it will stop selling denture creams that contain zinc.

Excessive zinc intake can cause serious neurological problems and lead to numbness, tingling or weakness in the limbs as well as difficulty walking and balancing or anemia and other blood problems, the company said.

The company said it’s a precautionary move designed to prevent any potential long-term health problems in people who use zinc-containing Poli-Grip in excess of the amount indicated on the label.

And they’re also warning consumers who are using too much of the product to immediately stop and see their doctor if they have any concerns.

You can read the rest of the article here: Zinc to be removed from some denture creams

Source: Globe and Mail Online, Feb 19, 2010, http://www.theglobeandmail.com/life/health/zinc-to-be-removed-from-some-denture-creams/article1474174/ Read Feb 20/2010

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

I'm wanting feedback on this potential advertisement

Hi everyone,

I'm thinking this will be the template for advertising in the buildings around us. Any comments/suggestions?

Hans.

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

Dental Did You Know: What's in your Toothpaste Part 2

Surfactants (detergents) such as sodium lauryl sulfate, ammonium lauryl sulfate and lauryl sarcosinate are used to produce a foam that helps clean teeth. The first two have significant antibacterial properties but can irritate oral tissues. To minimize this, lauryl sarcosinate is used in part or in whole as a replacement.

Source: Field S, Why There's Antifreeze in Your Toothpaste: The Chemistry of Household Ingredients, Chicago Review Press, 2008, pg 239-241.

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

Dental Did You Know: What's in your Toothpaste Part 1

Hydrated Silica: also known as Silicic Acid, Silica Gel, and Amorphous Silicon Dioxide

Chemical Formula: SiO2.nH20

Description: Transparent Gel

Use: It is the abrasive used in gel toothpaste or as a secondary abrasive in opaque toothpastes

Source: Field S, Why There's Antifreeze in Your Toothpaste: The Chemistry of Household Ingredients, Chicago Review Press, 2008, pg 239-240.

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

Dental Did You Know: Dental Radiation and Airport Scanners?

Hi everyone,

Ok, it seems that everyone is worked up about the potential for damage from these new airport backscatter radiation scanners. (Which also brings up the topic of radiation doses from dental radiographs). On occasion, certain patients will decline radiographs because they think the doses they are receiving are large.

To clear the record, this chart from the Health Physics Society (http://www.hps.org) gives us the basis of where a dental radiograph is compared to other medical xray procedures:

(Dosage in millirem (mrem))

Skull (lateral): 1

Chest (PA): 2

Skull (PA or AP): 3

Chest (lateral): 4

Chest (PA and lateral): 6

Limbs and joints: 6

Thoracic spine (AP): 40

Thoracic spine (lateral): 30

Lumbar spine (AP): 70

Lumbar spine (lateral): 30

Abdomen (AP): 70

Abdomen: 53

Pelvis (AP): 70

Pelvis or hips: 83

Bitewing dental film: 0.4

As you can see, dental films are *way* down the scale in terms of dosage and provide information that is beneficial to the patient in term of detecting potentially large cavities in between teeth and other pathological conditions.

As another basis of comparison, most people don't know they are getting a dose of radiation from the environment: house, lawn, park, work, airplane, office etc. This dose is in the range of 300 millirem per year. The new airport scanners are 5-10 microrem (not millirem), therefore going through these scanners are about 1/50th of a dental radiograph and 1/30000 background radiation.

Now, any radiation dose is not good for you, but we as health practitioners have to balance out the consequences of not taking a picture vs. taking the pictures. The odds ratios almost always favour taking a radiograph in order to help the patient overall.

As for the airport scanners, I would personally be more worried about crossing the street in traffic.

Cheers,

Hans

Source: Stabin M, Doses from Medical Radiation Sources, Health Physics Society, Dec 18, 2009, Read on Feb 3/10, http://www.hps.org/hpspublications/articles/dosesfrommedicalradiation.html

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100

Dental Records for Canadians Missing in Haiti

Hi everyone,

One of the sad aspects of being a dentist is being asked by authorities for chart records to identify victims of disasters such as those in the Haitian earthquake zone. Quoted below is the (edited for brevity) text of an electronic bulletin from the Canadian Dental Association (CDA) with respect to the relief efforts in Haiti:

The massive earthquake that recently struck Haiti has affected an estimated 3 million people according to the Canadian Red Cross, resulting in extreme injuries and significant loss of life. As of January 22, over 300 Canadians are still unaccounted for in Haiti.

Canada is responding to the disaster in several ways including providing troops and personnel for humanitarian aid, search and rescue, and disaster victim identification (DVI). Dental records are one of the most important sources of identification for all DVI efforts. Since Canada has such a high standard of dental care, dental records will form the basis of the positive identification of missing Canadian citizens. Using dental records is a highly accurate and inexpensive method of identifying a person during a disaster.

Original dental records and radiographs of all types are needed to help identify missing citizens. Chief coroners, chief medical examiners and/or police departments in each province will develop a list of missing and presumed deceased persons. They will then attempt to acquire antemortem records for these people, including dental records from treating dentists and data from other sources such as medical records, fingerprints or DNA.

As always your generosity to the people of Haiti is needed at this time...please give generously.

Source: (email) CDA Alert, Jan 22, 2010, Dental Records for Canadian Missing in Haiti, Canadian Dental Association, http://www.cda-adc.ca

Take Care

Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)
(905) 273-7100