Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
EndodontologyEvaluation of different methods for the root-end cavity preparation☆
Section snippets
Specimen selection
One hundred recently extracted human teeth, 43 canines of both jaws and 57 incisors of the lower jaw, having a straight single root with fully developed apices were used in this study. All teeth were immersed in a 3% NaOCl solution for 15 minutes immediately after extraction. Afterwards, remaining periapical and periodontal tissues were removed with curettes and stored in a saline solution at room temperature.
Specimen preparation
An evaluation of the existence of fractures or dentinal cracks in roots due to the
Crack formation
Close inspection of the resected root surfaces immediately after cutting the root apex did not reveal any crack formation. After the root-end cavity preparation there were no detectable complete cracks involving dentine and cementum. However, small intradentinal cracks (incomplete cracks) were detected in 7% of the small roots of group A, 20% of the large and 21% of the small roots in group C (Table I).
Debris in the cavities
All methods used produced dentine chips on the walls of cavities However, the amount of
Discussion
Recent studies have shown that an ideal root-end cavity preparation is very difficult to achieve with the use of burs on micro-motor, and that better results are obtained with the use of ultrasonic tips.1., 5., 7. Furthermore, an increased cavity depth can be achieved with ultrasonic tips, a significant factor for controlling apical leakage.16 Thus, an increase of the success rate of endodontic surgery procedure may be expected since isthmuses, fins, and other significant anatomical
Conclusion
Based on the conditions of this study, the following conclusions can be drawn:
The area of the root-end dentin surfaces after resection does not influence the crack formation during the preparation of the root-end cavity with rotary, sonic, and ultrasonic instruments.
Cracks were produced at the root-end face, mainly when the smooth stainless steel ultrasonic retrotips were used.
Dentinal chips were found in all experimental groups with the highest rate in the rotary instrument group.
Gutta-percha
References (23)
Ultrasonic root end preparation
Dent Clin N Am
(1997)- et al.
A comparison between two root end preparation techniques in human cadavers
J Endod
(1994) - et al.
Preliminary investigation of ultrasonic root end preparation
J Endod
(1995) - et al.
Effects of ultrasonic root-end preparation on microcrack formation and leakage
J Endod
(2000) - et al.
Evaluation of cracks associated with ultrasonic root end preparation
J Endod
(1996) - et al.
Incidence of root face alteration after ultrasonic retrograde cavity preparation
Oral Surg Oral Med Oral Path Oral Radiol Endod
(1997) - et al.
Apical dentin permeability and microleakage associated with root end resection and retrograde filling
J Endod
(1994) - et al.
Short-term observation of the results of endodontic surgery with the use of a surgical operation microscope and super-EBA as root-end filling material
J Endod
(1999) - et al.
Quality of root-end preparations using ultrasonic and rotary instrumentation in cadavers
J Endod
(2000) - et al.
A scanning electron microscopic study of in vivo ultrasonic root-end preparations
J Endod
(1999)
Root-end cavity preparation after apicoectomy using a new type of sonic and diamond-surfaced retrotip: a 1-year follow up study
Oral Maxillofac Surg
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This investigation was supported by a grant from the secretariat of the Research Committee of the National and Kapodistrian University of Athens.