Poster Presentation

Poster Presentation

PR44 - Teaching Length Control in Endodontics to Predoctoral Dental Students: Rubber Stoppers or Calibrations Rings?

Thursday, April 26
10:00 AM - 1:00 PM
Room: Exhibit Hall

Introduction: When teaching length control, two techniques are available to the educator: rubber stoppers (RS) and calibration rings (CR). The aim of this study was to compare these two methods of length control using the palatal canal of a standardized 3-D printed maxillary first molar with 20 third-year dental student operators. Methods: Twenty new third-year dental students were asked to instrument the palatal canal of a 3-D printed maxillary 1st molar held in their hand to a target length of 22 mm using Wave One and Vortex Blue rotary files. A within-subjects experimental design was used, with each participant completing the exercise once with each measurement technique. After instrumentation, the final file was placed to the instrumented length, glued, and covered with black tape. All teeth were evaluated radiographically with MiPACS™ software to determine instrumented length accuracy as compared to the control length of 22 mm. Results: A t-test was used to compare actual instrumented lengths between groups.  There was no significant difference (p=0.06) between RS and CR groups. However, when outliers with > 1 mm discrepancy from 22 mm target length were removed (3 for RS, 1 for CR), CR technique was significantly more accurate than RS (p=0.03). When surveyed after completing the experiment, a majority of students stated they preferred using CR to RS. Conclusions: In this experiment no significant difference in measurement accuracy was found between RS and CR. However, with outliers removed, CR were more accurate in length control than RS.

Charlie Kendall

Advanced Endodontic Resident

Dr. Kendall graduated from UMKC School of Dentistry 2016. He is married with three beautiful children, two girls and a baby boy! He plans to practice in the Midwest upon graduation.

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Kenneth J. Frick

Director, Advanced Endodontics Program, UMKC School of Dentistry
University of Missouri - Kansas City

USAF GPR and general military practice 1986-1989; Private general practice 1989 to 1995; Endo residency 1995-1997; Private endodontic practice 1997 -2012; Advanced Endodontic Program Director 2013 - present.

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Mary P. Walker

Professor and Associate Dean for Research and Graduate Programs
University of Missouri - Kansas City

Practiced general dentistry for ten years before returning to UMKC to complete a combined Prosthodontics/PhD program, which upon completion began full time academic appointment. As Associate Dean for Research and Graduate Programs, Dr. Walker coordinates program curriculum and CODA Standards among all specialty programs; oversees the Master's of Science Graduate Program for Advanced Education Residents; director and manager of professional biomaterials laboratory.

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