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Samuel St. John

Samuel St. John


Dec 20, 2016


Dec 20, 2022


1 Hour


1 CE Credit




The purpose of this talk is to provide a condensed historical account of clinical and technical research on dentifrice abrasivity, which culminated in the methods we use and standards we apply for today’s commercial dentifrices. It is hoped that this information will help researchers to not only recognize and appreciate the sound, scientific basis for current models, but also to help them remember a few key concepts that remain relevant to the continued evolution of dentifrice abrasion models.


  • Review the science used to determine the current abrasive limit of RDA 250
  • Reaffirm the current FDA abrasive limits
  • Review practical dental applications

Course Details

Course Fee Free
Credits 1 CE Credit
Method Self-Instructional
Audience General Dentist, Dental Hygienist, Dental Assistant
AGD Subject Code 017

Educator Details

Samuel St. John graduated in 2003 with a degree in Chemical Engineering from Clarkson University and went to work at The Procter & Gamble Company following two internships there. In 2008, he went back to graduate school at the University of Cincinnati where he graduated with a PhD in Chemical Engineering. Following his PhD work, Sam was a post-doctoral researcher at the University of Tennessee in Tom Zawodzinski’s lab. His research focused on electrochemical oxidation reactions and inorganic synthesis of nano-structures characterized using high-energy particle scattering.

Samuel rejoined P&G Oral Care R&D in 2016 to continue his work on understanding the etiology of oral diseases. He is interested in the invention and development of new-to-the-world oral care ingredients for the prevention and treatment of dental caries, erosion, and tartar formation, as well as breakthrough products for the treatment of gingivitis.

Disclaimer / Disclosure


Approved PACE Program Provider. FAGD/MAGD Credit. Approval does not imply acceptance by a state or provincial board of dentistry or AGD endorsement. 6/1/16 to 5/31/20. Provider ID 306446.


Catapult Education, LLC is an ADA CERP Recognized Provider. ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providers of continuing dental education. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry.


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The opinions expressed on this website come from a variety of writers and speakers that are not necessarily endorsed by Catapult Education or its associates. Viewers are responsible for verifying the validity, accuracy and relevance of all content before implementing any techniques, products or recommendations into their clinical setting. Viewers understand that Catapult Education its associates, writers, speakers, and sponsored affiliates are not in any way responsible or liable for any adverse events that may occur (i.e., in a clinical setting or anywhere) based on any information disseminated from Catapult Education sites. ×


This presentation is funded (in part) by Procter & Gamble. Samuel St. John receives compensation from Proctor & Gamble for the time involved in preparing and delivering this presentation. Catapult Group delivers clinically relevant continuing dental education programs which address the needs and preferences of our audience and provides them with the knowledge and confidence to integrate new techniques, practice management and treatment options into their respective practices. Catapult Group is committed to ensuring the content quality, objectivity and scientific integrity of all continuing education courses. Instructors are advised to support clinical recommendations with scientific research-supported data whenever possible and to disclose any conflict of interest between them and any corporate organization offering financial support or grant monies for this CE activity. Instructors are advised, where appropriate and if relevant to the subject matter of the presentation, to mention a variety of different product choices so as to present a balanced view of all therapeutic options available and promote improvements in oral healthcare free from commercial bias. ×

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