Episode Details

Host: Dr. Melissa Seibert

Guest: Dr. Matt Chesler, Board-Trained Endodontist & Resident Faculty at Spear Education

Episode Summary

In this episode of Dental Digest, host Dr. Melissa Seibert sits down with endodontist Dr. Matt Chesler to break down the most intimidating aspects of molar endodontics . From overcoming access anxiety in deeply calcified teeth to navigating complex MB2 anatomy and proper hand-file selection, Dr. Chesler shares practical, evidence-based strategies to improve clinical confidence and prevent misadventures .

Guest Bio

Dr. Matt Chesler is a board-trained endodontist with over 20 years in the specialty and serves as resident faculty at Spear Education . He earned his DDS from the University of Southern California (USC), completed his endodontics residency at the Naval Postgraduate Dental School in Bethesda, and holds a Master of Science from George Washington University . He has been teaching clinical endodontics to dentists for over a decade .

Key Takeaways & Clinical Pearls 1. Molar Access vs. Anterior/Premolar Access

• Greater Forgiveness: Molars offer significantly more space and room for minor access errors compared to anterior teeth or premolars, where the margins for error are much tighter .

• Magnification & Illumination: High magnification and proper illumination are mandatory for identifying heavily calcified canals .

2. Access Strategy for Calcified Canals

• Trajectory: Canals enter the pulp chamber at an angle rather than straight vertically .

• Search Laterally First: Before taking down the pulpal floor, expand the access preparation laterally . Look for color changes and the historical outline of the pulp chamber .

• Orifice Location: Orifices are typically located at the floor-wall junction .

• Ultrasonics Over High-Speeds: Put away high-speed handpieces early to avoid damage . Use end-cutting ultrasonic tips (such as the Buck II tip) to drop the pulpal floor safely .

3. Critical Depth Benchmarks

• Research Data (Dr. Alan Deutsch Studies):

  • Average distance from occlusal surface to chamber roof: 6.25 mm .

  • Average pulp chamber height: 1.5 mm to 2 mm .

• Safety Rule: You generally have roughly 6.5 mm of safe drilling depth from the occlusal surface before reaching the chamber .

• Radiographic Checkpoint: If you reach 6.5 mm to 7 mm in depth and have not entered the chamber, stop and take a radiograph to verify alignment and prevent perforation .

4. Workflow & Tactile Training

• Initial Access: Start with a small bur (e.g., #330 or #1931) to identify the safe zone while preserving tooth structure .

• Unro