Objective: To study the factors effecting the survival of teeth with non-surgical root canal therapy (NS-RCT). Methods: Insurance claims were analyzed for 438,487 initial NS-RCT procedures to determine the effect of provider type, patient age, tooth position, presence of post/core, and crown at 90 days on survival of teeth with NS-RCT. The survival time is taken as the time from landmark (90 days post-procedure) to extraction. Kaplan-Meier survival estimates were evaluated for 1, 3, 5, and 10 years. Adjusted hazard ratios (aHR’s) were calculated using multiple Cox proportional hazards regression analysis; sandwich estimator was used to obtain robust standard errors that adjust for within-subject correlation. Results: Overall survival was 98.2%, 94.4%, 90.8%, and 82.8% at 1, 3, 5 and 10 years, respectively. Significant differences based on the provider type were noted. Ten-year survival rates were 84.5% and 81.9% for teeth treated by endodontists and other providers, respectively. In the multiple regression analysis, significant differences in survival were found comparing NS-RCT provider (other provider vs. endodontist, aHR 1.31 [1.27, 1.35]) and tooth location (molar vs. anterior, aHR 1.26 [1.21, 1.31]). Increasing age at NS-RCT was significantly associated with a greater hazard of extraction. Placement of core/post and crown within 90 days were each significantly associated with a reduced hazard of extraction (aHR 0.74 [0.72, 0.76] and aHR 0.53 [0.51, 0.54]). Conclusion: This study demonstrates that survival rates of NS-RCT treated teeth are higher among teeth treated by endodontists, when a crown was placed within 90 days of NS-RCT and among younger patients.
Dr. Alex Moore is from Northern Illinois and was brought to Chicago for his undergraduate studies at DePaul University. He then went on to earn his Doctor of Dental Medicine degree at the University of Illinois at Chicago College of Dentistry. After eight years in Chicago he moved north to Milwaukee and is currently a second-year Endodontic Resident at Marquette University School of Dentistry. He plans to come back to Chicago to practice upon completion of the program and teach part-time in Marquette’s Endodontic Clinic. He is also on the AAE Resident and New Practitioner Committee.
Dr. Bhagavatula is currently an Assistant Professor in Program in Dental Public Health at Marquette University School of Dentistry, Milwaukee, Wisconsin. He received his Bachelor of Dental Surgery from Bapuji Dental College and Hospital, Davangere, India, Master of Public Health from University of Alabama at Birmingham and Master of Science in Dental Public Health from University of Iowa. His primary research interest is in examining the role of social determinants of oral disease and dental care utilization.
Medical College of Wisconsin
Lisa Rein started working at the Medical College of Wisconsin in the summer of 2014. Lisa has been working as a Biostatistician within the Biostatistics Consulting Service.
Medical College of Wisconsin
Dr. Aniko Szabo is an Associate Professor and Director of the Biostatistics Consulting Service. Dr. Szabo's research interests are in statistical modeling of biomedical data. She has worked on analysis methods for PCR and microarray data, developing tree models of oncogenesis, nonparametric models of clustered discrete data, and population level models of the effect of screening on prostate cancer incidence. She collaborates with biomedical investigators across the entire spectrum of translational research from analyzing cellular assays, animal experiments, and observational studies in patients to designing prospective clinical trials and evaluation of policy impacts in national databases.
Vice President & Science Officer
Delta Dental of Wisconsin
Dr. Eichmiller is the Vice President and Dental Director at Delta Dental of Wisconsin. He leads Delta Dental’s efforts to identify emerging technologies and trends in the dental industry.
Prior to joining Delta Dental, Dr. Eichmiller served as Director of the Paffenbarger Research Center, a dental research enterprise operated by the American Dental Association Health Foundation. The center, located in Gaithersburg, MD, engages in cooperative dental and medical materials research with government scientists and others, helping to develop standards, treatments, instruments and materials used by dentists nationwide.
Dr. Eichmiller has published over 70 academic papers reflecting research on dental restorative materials and other dental-related topics. He is the recipient of several honors and awards, including the Hollenback Award for Dental Research from the Academy of Operative Dentistry, a Presidential Citation from the American Dental Association, and Clinician of The Year Award from the American Academy of Gold Foil Operators.
Dr. Eichmiller received his BS and DDS degrees from the University of Minnesota, School of Dentistry. Dr. Eichmiller is a graduate of the University of Minnesota with Degrees in Dentistry and Mechanical Engineering. He was in private practice for five years and has had dental teaching assignments at several universities.
Dr. Sheila Stover received her Bachelor of Science degree in biology from the University of Wisconsin – Milwaukee in 1993. She attended the Marquette University School of Dentistry for dental school, an advanced education in general dentistry residency program and a graduate program in endodontics. Sheila received her DDS, AEGD Certificate, MS and Endodontic Specialty Certificate in 1997, 1998 and 2003 respectively. Dr. Stover attended the Medical College of Wisconsin to receive her Master’s in Public Health degree in 2008. Sheila is proud of and has enjoyed a career of teaching full time at Marquette’s dental school as well as private practice.