A new method is developed for predicting shade improvement after teeth bleaching

December 22, 2010

Researchers at the University of Granada have developed a new method for predicting the precise shade that a bleaching treatment will bring about for a patient's teeth. What is innovative about this method is that it allows researchers to successfully predict the outcome of a bleaching treatment, which will have a significant impact on such treatments, which are becoming more frequent.

At present, dental offices routinely employ carbomide peroxide bleaching agents for tooth discoloration. As bleaching treatments have soft side effects -all of them temporary and mild- and are relatively cost-effective, they have become very popular.

While bleaching treatments have been long applied, one of its main problems has been the inability to predict the outcome of the process. This means that, so far, dentists have been unable to predict the results for patients' teeth. This means that dental physicians could not inform their patients on the shade improvement that the treatment would bring about, which was a limitation to the therapy.

The study was conducted by Janiley Santana Díaz, at the Department of Stomatology of the University of Granada and was coordinated by professors Rosa Mª Pulgar Encinas, Mª Del Mar Pérez Gómez and Luis Javier Herrera Maldonado. Using a fuzzy rule system, scientists had a first approach to the shade improvement that teeth can get after undergoing a 20% carbamide peroxide treatment (Opalescence® PF 20%, Ultradent) two hours a day for two weeks.


For the purpose of this study, authors took a sample of 53 subjects that subsequently underwent a teeth bleaching treatment. Before the bleaching treatment, participants answered a questionnaire on their eating habits so that scientists analyzed whether such habits had any impact on the prediction models. The researchers found that eating habits are not relevant to such models, so these factors where not considered in the study.

To illustrate the shade change expected after the teeth bleaching treatment, the University of Granada researchers designed a fuzzy system that allows to associate these instrumental measures to the commercial shade guides typically used at dental offices to identify the before-and-after tooth color.

Such association allows to establish a series of objective guidelines that, once the before-tooth color is identified with the closest shade of the guide, will allow both dentist and patient to predict the color that the teeth will get after the treatment.

All in all, researchers warn that, in the long term and given the limitation of any clinical trial, a wider range of patients and initial tooth colors would be required to obtain a more precise fuzzy system.

National Communications:

L.J. Herrera, H. Pomares, I. Rojas, J. Santana, R. Pulgar, R. Ghinea, M.M. Pérez. Sistemas Neuro-Difusos para el Modelado de la Evolución del Color. Modelado de un Proceso de Blanqueamiento Dental. ESTYLF´2010, February 3-5, 2010. Accepted for publication.

International Communications:

J. Santana-Díaz, J. López-García, L.J. Herrera-Maldonado, M.M. Pérez-Gómez, R. Pulgar-Encinas. Prediction of color change after tooth bleaching using color CIELAB parameters and linear models. CONSEURO 2009, March 2009 Seville, Clinical Oral Investigations, vol. 13, No 1, pp. 97 (49-118).

L.J. Herrera, M.M. Pérez, J. Santana, R. Pulgar, J. González, H. Pomares, I. Rojas. A Data Mining Approach Based on a Local-Global Fuzzy Modelling for Prediction of Color Change after Tooth Bleaching using Vita Classical Shades. 2009 Ninth International Conference on Intelligent Systems Design and Applications, December 2009 Pisa, Italy, pp. 1268-1273.

Published Article:

Herrera LJ, Pulgar R, Santana J, Cardona JC, Guillén A, Rojas I, Pérez MM. Prediction of Color Change after Tooth Bleaching using Fuzzy Logic for Vita Classical Shades Identification. Article approved for publication in the journal Applied Optics, February 2010, vol. 49 No 4.

Contact: Janiley Santana Díaz. Department of Stomatology of the University of Granada. Phone Number: +34 958 248 983. E-Mail Address: janiley_tfe@hotmail.com

Accessible on English version

Accesible en Versión española

Accessible sur le site Version française

University of Granada

Related Eating Habits Articles from Brightsurf:

Shifts in water temperatures affect eating habits of larval tuna at critical life stage
Small shifts in ocean temperature can have significant effects on the eating habits of blackfin tuna during the larval stage of development, when finding food and growing quickly are critical to long-term survival.

DNA in fringe-lipped bat poop reveals unexpected eating habits
By examining the poop of the fringe-lipped bat (Trachops cirrhosus), a team at the Smithsonian Tropical Research Institute (STRI) encountered surprising results about its eating habits and foraging abilities.

Norman Conquest of 1066 did little to change people's eating habits
Archaeologists from Cardiff University and the University of Sheffield have combined the latest scientific methods to offer new insights into life during the Norman Conquest of England.

Gut bacteria may modify behavior in worms, influencing eating habits
Gut bacteria are tiny but may play an outsized role not only in the host animal's digestive health, but in their overall well-being.

Temperament affects children's eating habits
Temperamental children are at greater risk for developing unhealthy eating habits.

Pre-COVID-19 poll of older adults hints at potential impact of pandemic on eating habits
Most people in their 50s and older were capable home cooks just before COVID-19 struck America, but only 5% had ordered groceries online, according to a new national poll.

Revving habits up and down, new insight into how the brain forms habits
Each day, humans and animals rely on habits to complete routine tasks such as eating.

More stroke awareness, better eating habits may help reduce stroke risk for young adult African-Americans
Young African-Americans are experiencing higher rates of stroke because of health conditions such as high blood pressure, diabetes and obesity, yet their perception of their stroke risk is low.

Social media users 'copy' friends' eating habits
Social media users are more likely to eat fruit and veg -- or snack on junk food -- if they think their friends do the same, a new study has found.

Interest in presidential eating habits may affect the public's food choices
A recent study by a Penn State researcher examined how President Donald Trump's reported fondness for fast food may affect the public's perception of fast food and the likelihood, based on their media habits, one might purchase some.

Read More: Eating Habits News and Eating Habits Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.