Comparison of Working Length Loss In Manual Versus Rotary (Waveone) Preparation In Curved Canals; A Quasi-Experimental Study

Abstract

Objective: To compare the consistency of working length control in hand instrumentation and engine-driven rotary files Wave One by comparing their pre and post-instrumentation working lengths. Study Design: Quasi-experimental study. Place and Duration of Study: Armed Forces Institute of Dentistry, Rawalpindi Pakistan, from Jun to Dec 2019. Methodology: A total of 90 mandibular first molars were selected. Two groups were drawn with 45 mesio buccal canals each. The First-Group was prepared with manual K-files, whereas the second group had rotary instrumentation using the WaveOne system. Pre and post-preparation working lengths were noted. Results: The mean pre-operative (18.5±1.03mm) and post-operative (18.15±1.09mm) working lengths of manually prepared and WaveOne prepared canals (18.8±3.43mm and 18.7±3.25mm respectively) presented statistically significant loss of postoperative working lengths. The comparison of the two groups gives a statistically significant result in manual preparation, showing a greater loss of working length as compared to canals prepared with WaveOne rotary files. Conclusion: Manual instrumentation causes a greater loss of working length by straightening the canal more than enginedriven WaveOne rotary files postoperatively.

Keywords

• Endodontic instruments
• Dentists
• Dental instruments
• Root canal preparation
• Endodontics
• Root canal therapy