New York University Skip to Content Skip to Search Skip to Navigation Skip to Sub Navigation

NYU Dental Study Identifies Promising New Approach for Treating Tooth Hypersensitivity

August 20, 2010
N-479, 2009-10

New York University College of Dentistry researchers have identified a promising new approach for treating tooth hypersensitivity, while simultaneously preventing bacteria from causing further harm.

In the NYU dental study, a coating made from fluoride and zinc ions in a calcium-phosphate matrix proved effective in reversing damage to the tubules caused by Streptococcus mutans, a bacterium commonly associated with tooth decay. The coating not only caused the exposed tubules to close again, but also prevented Streptococcus mutans from causing further damage. The findings were presented on July 17, at the 2010 annual meeting of the International Association for Dental Research in Barcelona, Spain.

Tooth hypersensitivity occurs when the dentin, which lies just below the surface of the tooth, becomes exposed, causing tubules – tiny structures that transmit stimuli to the tooth nerve – to open up. When open tubules come in contact with cold, hot, sweet, or acidic substances, painful stimuli are transmitted to the tooth nerve.  Typically, hypersensitivity is caused by oral bacteria, which attach to the tooth surface and leave an acidic residue of tartar and plaque.

Most toothpastes, protective strips, and other treatments for tooth hypersensitivity utilize potassium oxalate to close the tubules.  But potassium oxalate cannot prevent a recurrence of tooth hypersensitivity because it is highly susceptible to the effects of acids in tartar, plaque, citrus drinks, and other liquids.

Co-prinicipal investigators Dr. Racquel Z. LeGeros, professor and Associate Chair of Biomaterials & Biomimetics at the NYU College of Dentistry, and Dr. Haijin Gu, Chief Dentist at Sun-yat-sen University Guanghua School of Stomatology in Guangzhuo, China, compared two groups of dentin samples immersed for 24 hours in a solution containing Streptococcus mutans. One group was treated with the calcium-phosphate/fluoride/zinc formulation for eight minutes, while the second group received no treatment.  Bacteria multiplied on the untreated samples, but their growth and development was inhibited on the treated dentin.  In addition, the treated group had significantly fewer open tubules than the untreated one.

“Because the calcium, phosphate, and fluoride ions formed a solution that occluded the open dentin tubules, and the zinc ions inhibited bacterial growth and colonization, our findings suggest that this formulation may represent a tooth hypersensitivity treatment that is less susceptible to the effects of acid than treatments made with potassium oxalate,” said Dr. LeGeros, who plans additional testing to confirm the findings.

Coinvestigators on the study included Dr. Robert Boylan, Associate Professor of Basic Science & Craniofacial Biology, and Dr. John P. LeGeros, Adjunct Professor of Biomaterials & Biomimetics, both of the NYU College of Dentistry; Dr. Junqi Li, Dean of the Guanghua School of Stomatology; and Dr. Danni Fan, Assistant Professor of Prosthodontics at the Guanghua School of Stomatology .

About New York University College of Dentistry Founded in 1865, New York University College of Dentistry (NYUCD) is the third oldest and the largest dental school in the US, educating more than 8 percent of all dentists. NYUCD has a significant global reach and provides a level of national and international diversity among its students that is unmatched by any other dental school.

This Press Release is in the following Topics:
NYUToday-feature, Research, College of Dentistry

Type: Press Release

Press Contact: Christopher James | (212) 998-6876

NYU Dental Study Identifies Promising New Approach for Treating Tooth Hypersensitivity

Search News



NYU In the News

NYU Offers Financial Aid to Undocumented Students

The Wall Street Journal reported that NYU will begin offering scholarship aid to undocumented students for the school year beginning next September.

NYU Adopts Lean LaunchPad Program to Teach Entrepreneurship

Startup guru Steve Blank, in a Huffington Post blog, described how NYU adopted the Lean LaunchPad model to teach entrepreneurship to students and faculty at NYU.

Biology Professor Jane Carlton Examines Wastewater for the City’s Microbiome

The New York Times’ Science Times column “Well” profiled Biology Professor Jane Carlton and her research project to sequence microbiome of New York City by examining wastewater samples.

Steinhardt Professors Use a Play as Therapy

The New York Times wrote about a play written by Steinhardt Music Professor Robert Landy about the relationship between Adjunct Professor Cecilia Dintino, a clinical psychologist in the Drama Therapy Program, and a patient, former Broadway actress Jill Powell.

NYU Public Health Experts Urge Strengthening Local Health Systems to Combat Ebola

Dean Cheryl Healton of the Global Institute of Public Health and Public Health Professor Christopher Dickey wrote an op-ed in the Huffington Post saying international health agencies need to strengthen their presence in countries at the local level to prevent future ebola outbreaks.

NYU Footer