Clinical researchThe In Vivo Evaluation of Hand/Rotary/Ultrasound Instrumentation in Necrotic, Human Mandibular Molars
Section snippets
Materials and Methods
Forty-eight adult subjects participated in this study. The Human Subjects Review Committee of The Ohio State University approved the study, and written informed consent was obtained from each subject. The subjects were in good health as determined by written and oral questioning.
Clinical examination by thermal (Green Endo-Ice®, Hygenic Corp., Akron, OH), electric pulp (Kerr Vitality Scanner, Kerr Dental, West Collins Orange, CA), and percussion testing indicated all mandibular molars had an
Results
A comparison of canal and isthmus cleanliness is shown in the Table 1. Fig. 2 shows examples of canal preparation for the hand/rotary group and hand/rotary/ultrasound group.
For canal cleanliness, there were significant differences at all eleven apical levels between the two techniques (Table 1). Isthmus cleanliness values were significantly different between the two treatment groups at all eleven levels examined (Table).
The uninstrumented control teeth (Group 3) showed mean canal cleanliness
Discussion
The mean canal cleanliness values (Table 1) for the hand/rotary instrumentation group are better as compared to those reported by other authors utilizing step-back preparation method (2, 3, 4) and similar to those reported by Gutarts et al. (12). These studies all utilized vital teeth and therefore more tissue had to be removed as compared to the necrotic root canals (Group 3 – Table) used in this study. The addition of 1-minute of ultrasonically activated NaOCl significantly improved the
Acknowledgment
This study was supported by research funding from the Endodontic Graduate Students’ Research Fund, The Ohio State University.
The ultrasonic irrigating device has been patented and is owned by The Ohio State University. Dr. Nusstein is the inventor with potential financial interest in this device.
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This study was supported by research funding from the Graduate Student Research Fund, Section of Endodontics, The Ohio State University.