Dr. Amir Azarpazhooh (pronounced “Azar pa joo”) earned his DDS (Iran, 2001) and completed graduate training in Dental Public Health (2007), Endodontics (2010), and a PhD (2011) at the University of Toronto. He is a tenured Full Professor of Dentistry at the University of Toronto, specializing in Dental Public Health and Endodontics, and a Professor of Clinical Epidemiology at the Dalla Lana School of Public Health. He is also an investigator with the Toronto Health Economics and Technology Assessment Collaborative and leads the Divisions of Endodontics and Research at Mount Sinai Hospital. He has secured $1.5 million in research funding, supervised forty-five MSc and PhD trainees, edited an evidence-based dentistry textbook, authored seven book chapters, and published three hundred papers. His work has been cited over seven thousand times and is reflected in an H-index of forty-four and an I10-index of ninety-nine. He has delivered more than ninety presentations at national and international meetings and has received honours from Cochrane Canada, the Canadian Academy of Endodontics, the American Association of Endodontists, the WW Wood Award for Excellence in Dental Education, and multiple Journal of Endodontics Publication Awards (2020–2024). He also serves as an Associate Editor for the Journal of Endodontics. He is a Board-Certified Diplomate and Director of the American Board of Endodontics (2025–2028), and a fellow, examiner and a member of Board of Directors of the Royal College of Dentists of Canada. He practices part-time in a multi-specialty setting in Toronto and provides endodontic care to medically compromised patients at Mount Sinai Hospital.

Martin J. Rogers, DDS, is a full-time endodontist in private practice at Best Endodontics of Glenview and is an Assistant Clinical Professor in the Department of Endodontics at the University of Illinois Chicago (UIC). He earned his DDS from UIC in 1992, completed a General Practice Residency at Illinois Masonic Medical Center-serving as chief resident the following year-and received his Certificate in Endodontics from UIC in 1996.Dr. Rogers has held a part-time faculty appointment at UIC since graduation and currently serves as course director for Endodontic Microsurgery in the postgraduate program. His academic interests include local anesthesia and pain control, microsurgical techniques, and rotary instrumentation. He has authored peer-reviewed publications and lectures frequently to professional audiences.He is a past president of both the Illinois Association of Endodontists and the Edgar D. Coolidge Endodontic Study Club. He has served the American Association of Endodontists on multiple committees, including Dental Benefits, Membership Services, Clinical Practice, and Public and Professional Affairs.

Dr. Fouad obtained his DDS, Certificate of Endodontics, and MS at the University of Iowa. 

He served on the faculty and in various administrative roles at the University of Connecticut, the University of Maryland, and the University of North Carolina at Chapel Hill. He is currently Professor and Chair, Department of Endodontics, Director, Advanced Endodontics Program, and Interim Director, Health Information and Business Systems (HIBS) at the University of Alabama at Birmingham. 

Dr. Fouad has published over 120 peer-reviewed manuscripts, 62 editorials and invited manuscripts, 25 textbook chapters, and over 150 abstracts. He edited and co-authored several editions of the textbooks: Endodontic Microbiology and Endodontics: Principles and Practice. He served as Associate Editor of the Journal of Endodontics for 15 years and is currently Associate Editor of Dental Traumatology and the Endodontics Section of Frontiers of Dental Medicine. He is a Diplomate and Past President of the American Board of Endodontics. He received the Distinguished Scientist Award from the Pulp Biology and Regeneration Group of the IADR in 2017, the AAE President's Award in 2022, and the International Grossman's Award in 2023.

TATIANA MA. BOTERO D., DDS, MS Diplomate American Association of Endodontics Clinical Professor Cariology, Restorative Sciences and Endodontics Department School of Dentistry, University of Michigan Dr. Botero received her dental degree from CES University in Medelli­n, Colombia. She then completed specialty training in Endodontics at Pontificia Universidad Javeriana in Bogotá, Colombia, and went on to earn an advanced Specialty Certificate in Endodontics from the University of Michigan. Dr. Botero began her academic career as a Clinical Assistant Professor at CES University, alongside managing her private practice in Colombia. In 2001, she joined the University of Michigan, where she is currently a full-time Clinical Professor, teaching Endodontics to both undergraduate and graduate students. She served as director of the dental postgraduate fellowship program in Endodontics from 2017 to 2022, and continues to practice Endodontics at a private dental clinic in Michigan. In 2012, Dr. Botero became a Diplomate of the American Board of Endodontics. She joined the Regenerative Endodontic Committee of the American Association of Endodontists in 2013, served as chair from 2014 to 2020, and resumed that role for 2024-2025. She was also president of the Pulp Biology and Regeneration Group (2016-2017) of both the American Association for Dental Research and the International Association for Dental Research. Dr. Botero has authored and co-authored numerous peer-reviewed scientific articles and book chapters.

Dr. Bottino is the Robert W. Browne Endowed Professor of Dentistry in the Department of Cariology, Restorative Sciences, and Endodontics (CRSE) at the University of Michigan School of Dentistry (U-M). He is currently the Director of Research in CRSE and the Director of the Postgraduate Program in Regenerative Dentistry at U-M. As a principal investigator, Marco has received research grants related to regenerative medicine from the National Institutes of Health (NIH), foundations, and private industry. He has received the International Association for Dental Research (IADR) Centennial Emerging Leader Award and was the recipient of Young Investigator Awards from the IADR Pulp Biology and Implantology Research Groups and a prestigious Mentored Clinical Scientist Research Career Development Award from the National Institute for Dental and Craniofacial Research at NIH. He also serves as the reviewer for more than 30 journals in regenerative medicine and biomaterials, and, between 2018 and 2023, served as a standing member of the Musculoskeletal and Tissue Engineering (MTE) study section for the NIH. Marco is an elected Fellow of the Academy of Dental Materials (ADM) and a board member. The present study was conducted under Dr. Bottino's surveillance.

Dr. Steven Larsen, D.D.S., M.S., earned his Doctor of Dental Surgery degree from Northwestern University in Chicago. After nine years of general practice, he returned to Northwestern to complete a residency and Master of Science in Endodontics. Dr. Larsen practiced endodontics in Logan, Utah, where he also held leadership roles in the local ADA district and with the Utah AAE. He has lectured at the Utah Dental Association Annual Meeting, presented a hands-on endodontic course at the Academy of General Dentistry Annual Meeting in Salt Lake City, and given numerous presentations for dental study groups throughout his career. As an Assistant Professor in the Endodontic Department at the University of Utah School of Dentistry, Dr. Larsen achieved one of his career goals: helping students to learn, understand, and apply the fundamental principles of endodontics. Because "Endodontics is easy to make complex", Dr. Larsen prefers to ‘keep endodontics as simple as possible—it's better that way.'” Developing simple methods to teach endodontic skills to pre-clinical students was challenging, but it proved rewarding when they successfully applied those skills in the clinic. His focus has been centered on techniques of root canal instrumentation, and he has developed and patented innovative products designed to simplify and safely prepare canals.

Dr. Daniel Chavarría-Bolaños, MSc, PhD, earned his Dentistry degree from the University of Costa Rica and completed his Master’s in Endodontics at San Luis Potosí University in Mexico. He later obtained a PhD in Engineering and Materials Science from San Luis Potosí University through a dual-degree program with the University of Liège in Belgium, where he also received a PhD in Biomedical and Pharmaceutical Sciences.

He is currently a Full Professor and Researcher at the Faculty of Dentistry, University of Costa Rica, where he serves as Director of the Graduate Program in Dentistry and is the Founder and Head of the Master’s Program in Endodontics. Dr. Chavarría-Bolaños also teaches at the Orofacial Pain Clinic and is an Assistant Researcher at the National Laboratory of Nanotechnology, where he leads specific projects in biomaterials and pharmacological innovation.

A former President of the IADR Costa Rica Division and the current Vice President of the Costa Rica Academy of Endodontics, he has been actively involved in advancing the profession nationally and internationally. His research focuses on biomaterials, drug delivery systems, dental anesthesia, and pain management, and he has published extensively in peer-reviewed journals as well as contributed to several book chapters.

Dr. Ryan M. Walsh graduated from the University of Iowa, where he earned both his B.A. and D.D.S. degrees. He later headed south to Texas, completing advanced specialty training at Texas A&M Baylor College of Dentistry where he earned his Certificate in Endodontics along with a Master's in Oral Biology. Dr. Walsh is a Diplomate of the American Board of Endodontics. He serves on the Scientific Advisory Board of the Journal of Endodontics, holds a faculty appointment as Adjunct Assistant Professor at Texas A&M College of Dentistry, and is actively involved in clinical research focused on bioactive materials, resorption, and long-term outcomes in endodontic care. His work has been published in multiple peer-reviewed journals (including multiple publications in the JOE), and his lectures have taken him across the U.S. and around the world.

Dr. Philip Michaelson is an assistant professor in the Department of Endodontics and the Graduate Endodontic Program Director. He earned his undergraduate Bachelor of Arts degree in biology from Johns Hopkins University and his Master of Science degree with research on the physiology of ageing from Southern Methodist University. He received his dental degree from the University of Pennsylvania School of Dental Medicine and his certificate in endodontics from the University of Michigan School of Dentistry. He completed his American Board of Endodontics certification in April 2005 and maintains a faculty practice limited to endodontics. Dr. Michaelson worked as an associate doctor in the northern suburbs of Detroit, Michigan for a year and a half prior to starting his own solo endodontic practice outside of Cleveland, Ohio. A native Texan, he comes to the University of Pittsburgh after 24 years of private practice. Dr. Michaelson has been on the scientific advisory board for the Journal of Endodontics since 2006. He is also a moderator for Endolit, an endodontic discussion board.

She is an Associate Professor in the Department of Endodontics and the Director of Predoctoral Endodontics at the University of Pittsburgh School of Dental Medicine. She earned her dental degree and a certificate in Endodontics from the Federal University of Rio de Janeiro, Brazil. She also obtained a certificate in Endodontics from the University of Texas Health Science Center at Houston. In addition, she holds a Master's degree in Endodontics and a Ph.D. in Materials Science. Her research focuses on the physicochemical, mechanical, and biological properties of endodontic materials and instruments, as well as on elucidating the molecular mechanisms underlying apical periodontitis. She has published nearly 40 peer-reviewed manuscripts in Endodontics and one book chapter on endodontic filling materials.

Dr. Allen Ali Nasseh received his Doctor in Dental Surgery (DDS) degree from Northwestern University Dental School (Chicago, IL) in 1994 and completed his postdoctoral endodontic training at Harvard School of Dental Medicine in 1997, where he also received a Masters in Medical Sciences (MMSc) degree in bone biology. He is a senior Clinical Instructor and lecturer in the Post-doctoral endodontic program at Harvard School of Dental Medicine since 1997 and the former Alumni editor of the Harvard Dental Bulletin. He was the president and Chief Executive Officer for Real World Endo.

Dr. Alan Law received his Doctor of Dental Surgery and Certificate in Endodontics from the University of Iowa College of Dentistry, Iowa City, Iowa. He also completed his PhD, “Mechanisms and Modulation of Orofacial Pain”, with the Department of Pharmacology at the University of Iowa. Dr. Law has published over 40 articles in scientific and clinical journals, and has co-authored chapters on orofacial pain and regenerative Endodontics in Pathways of the Pulp and The Dental Pulp, is an editor of Endodontics: Principles and Practice, and has lectured at over 300 local, national and international meetings. He is a member the American Dental Association, American Association of Endodontics, and Omicron Kappa Upsilon Dental Honor Society, and a Fellow of the American College of Dentists and the International College of Dentists. He is a Past President of the American Association of Endodontists, Past President of the Minnesota Association of Endodontists, and Past President of the American Board of Endodontics. He is in full–time practice in the Twin Cities, Chief Clinical Officer-specialrty Practices for Park Dental Partners, Inc., and President of The Dental Specialists, a multi-specialty dental practice with over 45 specialists. He is also a Research Professor in the Division of Endodontics at the University of Minnesota.

After graduating from the University of Alberta Faculty of Dentistry, Dr. Nixdorf completed hospital dentistry residency at The Ohio State University, Anesthesia fellowship at Johns Hopkins University, Orofacial Pain fellowship at the University of Alberta, and a Master of Science in Clinic Research at the University of Minnesota. As a Diplomate of the National Dental Board of Anesthesiology (NDBA) and the American Board of Orofacial Pain (ABOP), he maintains a specialty Orofacial Pain practice on the diagnoses and management of chronic TMD pain, headaches, and neuropathic pain within multi-disciplinary settings. Dr. Nixdorf's research has focused on the topics of non-odontogenic "tooth" pain from a classification, diagnosis, epidemiology, and treatment perspectives, as well as TMD and most recently dental MRI, with over 95 published articles. Dr. Nixdorf is Professor, Division Director, and past Graduate Program Director at the University of Minnesota in the Division of TMD & Orofacial Pain.