Theoretical distribution of gutta-percha within root canals filled using cold lateral compaction based on numeric...

Area of Science:

• Endodontics
• Dental Materials Science
• Biomedical Engineering

Background:

• Root canal filling aims for complete obturation to prevent reinfection.
• Cold lateral compaction is a common technique, but void formation can compromise success.
• Quantifying theoretical voids is crucial for technique optimization.

Purpose of the Study:

• To introduce a novel numeric calculus method for determining the theoretical volume ratio of voids.
• To analyze the impact of canal geometry and accessory cone size on void formation during cold lateral compaction.

Main Methods:

• Creation of 21 simulated mathematical root canal models with varying diameters and tapers.
• Mathematical determination of cone areas and insertion depths using Microsoft Excel.
• Iterative measurement of residual void areas upon accessory cone insertion.
• Calculation of void volume ratio based on root canal volume and gutta-percha mass.

Main Results:

• Theoretical void volume ratio is significantly influenced by canal taper, apical preparation size, and accessory cone size.
• Larger apical preparation and taper, combined with smaller accessory cones, reduce voids in the apical third.
• The mathematical model accurately predicts theoretical void ratios.

Conclusions:

• The developed mathematical model offers a precise method for assessing theoretical void volume ratios in cold lateral compaction.
• Understanding these factors allows for improved root canal obturation techniques.
• Optimizing accessory cone selection and preparation size can minimize voids.